Abstract

The invention discloses a neodymium-iron-boron magnet material, a preparation method and use thereof. The neodymium-iron-boron magnet material comprises the following components of: 28-33 wt % of R, wherein R is a rare earth element, and R comprises 27-31.5 wt % of Nd; 0.30-1.3 wt % of Al; 0.35-0.6 wt % of Cu; more than 0 wt %—less than or equal to 0.74 wt % of Co; 0.98-1.2 wt % of B; 62-69 wt % of Fe, wherein wt % is a percentage of the mass of respective component in the total mass of the neodymium-iron-boron magnet material; the neodymium-iron-boron magnet material comprises Nb, and a mass content of'Nb satisfies the following condition: (Pr+Co) wt %≤(1+Nb) wt %. In the present invention, by further optimizing the formula of the neodymium-iron-boron magnet material, the coercivity of the neodymium-iron-boron magnet material prepared is significantly improved while maintaining higher remanence and squareness.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22D 11/00 - Continuous casting of metals, i.e. casting in indefinite lengths
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 33/04 - Making ferrous alloys by melting
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C23C 10/30 - Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, and a preparation method therefor and an application thereof. The neodymium-iron-boron magnet in the present invention comprises a first demagnetization-prone region, a first transition region, a non-demagnetization-prone region, a second transition region and a second demagnetization-prone region, which are sequentially distributed in a direction perpendicular to an orientation direction, wherein the first demagnetization-prone region, the second demagnetization-prone region, the non-demagnetization-prone region, the first transition region and the second transition region are all rectangular. In the present invention, by means of controlling the cooperation of the contents of Tb and Dy introduced by means of diffusion in transition regions, demagnetization-prone regions and non-demagnetization-prone regions, cross-region inter-diffusion of Tb or Dy caused by a concentration gradient difference of Tb in the transition region can be reduced. Moreover, in the present invention, the demagnetization-prone regions, the non-demagnetization-prone regions and the transition regions are all configured to be rectangular, such that the demagnetization resistance of four corners and long edges of a neodymium-iron-boron magnet can be improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

Disclosed are a neodymium-iron-boron magnet material, a preparation method, use thereof and a motor. The neodymium-iron-boron magnet material has an amorphous RE-rich phase located in a grain boundary phase. The amorphous RE-rich phase, containing elements TM, RE, Cu and Ga at an atom ratio of TM:RE:Cu:Ga=(15-30):(40-60):(10-25):(10-30), accounts for 3-8% by volume of the grain boundary phase. TM is Fe and Co. RE is a rare earth element. The neodymium-iron-boron magnet material increases the coercivity using none or a small amount of heavy rare earth elements, while maintaining high remanence and magnetic energy.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, a manufacturing method therefor, and the use thereof. The neodymium-iron-boron magnet of the present invention comprises a first easily-demagnetized region, a first transition region, a not-easily-demagnetized region, a second transition region and a second easily-demagnetized region, which are sequentially distributed in a direction perpendicular to the orientation direction, the first easily-demagnetized region, the second easily-demagnetized region, the not-easily-demagnetized region, the first transition region and the second transition region being all rectangular. By controlling the match between the content of Tb introduced by diffusion into the transition regions, the easily-demagnetized regions and the not-easily-demagnetized region and the content of Dy in all regions, the present invention can reduce the cross-region diffusion of Tb caused by the concentration gradient difference of Tb in the transition regions, and reduce the attenuation of surface magnetism and magnetic flux of the neodymium-iron-boron magnet and improve the demagnetization resistance of the neodymium-iron-boron magnet while ensuring the remanence of the neodymium-iron-boron magnet. In addition, since the easily-demagnetized regions, the not-easily-demagnetized region and the transition regions provided in the present invention are all rectangular, the demagnetization resistance of four corners and long sides of the neodymium-iron-boron magnet can be improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

The invention discloses a neodymium-iron-boron magnet material, a preparation method, and use thereof. The neodymium-iron-boron magnet material of the invention comprises a nanocrystalline Cu-rich phase located in an intergranular triangular zone, wherein: the nanocrystalline Cu-rich phase consists of elements TM, RE, Cu and Ga at an atom ratio of TM:RE:Cu:Ga=(1-20):(20-55):(25-70):(1-15); and a volume percentage of the nanocrystalline Cu-rich phase in the intergranular triangular zone is 4-12%, wherein TM comprises Fe and/or Co, and RE is a rare earth element. The neodymium-iron-boron magnet material of the present invention can improve the intrinsic coercivity and reduce the cost without using heavy rare earth elements or using a small amount of heavy rare earth elements, while maintaining the performances of higher remanence, magnetic energy product and squareness.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 1/055 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, a preparation method therefor and a use thereof. The neodymium-iron-boron magnet comprises a first demagnetization-prone area, a first transition area, a non-demagnetization-prone area, a second transition area and a second demagnetization-prone area which are sequentially distributed in a direction perpendicular to the orientation direction; the first demagnetization-prone area, the second demagnetization-prone area, the non-demagnetization-prone area, the first transition area and the second transition area are all rectangular; the HRE mass concentration in the first demagnetization-prone area is the same as that in the second demagnetization-prone area; the HRE mass concentration in the first transition area is the same as that in the second transition area; the HRE mass concentration ratio of the non-demagnetization-prone area to the first demagnetization-prone area is (0.3-0.95):1; and the HRE mass concentration ratio of the first transition area to the first demagnetization-prone area is (0.9-1):1, wherein HRE is Dy or Tb. According to the magnet, by means of HRE content coordination of the demagnetization-prone areas, the transition areas and the non-demagnetization-prone area, the demagnetization resistance of the neodymium-iron-boron magnet can be improved while reducing the usage amount of HRE.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 1/053 - Alloys characterised by their composition containing rare earth metals

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, a preparation method therefor and a use thereof. The neodymium-iron-boron magnet comprises an easy demagnetization area, a non-easy demagnetization area and a bonding area, wherein the volume of the easy demagnetization area accounts for 15-50% of the total volume of the neodymium-iron-boron magnet, the volume of the bonding area accounts for 0.5-4.0% of the total volume of the neodymium-iron-boron magnet, and the ratio of the coercive force of the non-easy demagnetization area to the coercive force of the easy demagnetization area is 0.7-1. According to the neodymium-iron-boron magnet provided by the present invention, good demagnetization resistance can be maintained while the cost is greatly reduced.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, a preparation method therefor and the use thereof. The magnet comprises a first demagnetization-prone area, a non-demagnetization-prone area, and a second demagnetization-prone area, which are sequentially arranged in a direction perpendicular to a direction of magnetization. Grain boundary diffusion treatment in a direction perpendicular to the direction of magnetization and grain boundary diffusion treatment in a direction parallel to the direction of magnetization are respectively performed on the demagnetization-prone areas and the non-demagnetization-prone area of the neodymium-iron-boron magnet, so as to control the distribution of the concentrations of heavy rare-earth elements in the demagnetization-prone areas of the neodymium-iron-boron magnet in the direction perpendicular to the direction of magnetization and the distribution of the concentrations of heavy rare earth elements in the non-demagnetization-prone area of the neodymium-iron-boron magnet in the direction parallel to the direction of the magnetization. The neodymium-iron-boron magnet can ensure high coercivity, high thermal stability, high squareness and high magnetic moment while reducing the amount of use of heavy rare earths in the neodymium-iron-boron magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

Disclosed in the present invention are a neodymium-iron-boron magnet, and a preparation method therefor and the use thereof. The neodymium-iron-boron magnet comprises a first demagnetization-prone region, a region where demagnetization is not prone to happen and a second demagnetization-prone region, which are sequentially arranged in the direction perpendicular to a magnetizing direction, wherein the ratio of the coercive force of the region where demagnetization is not prone to happen to that of the first demagnetization-prone region is (0.7-1):1 and is not 1:1, and the first demagnetization-prone region and the second demagnetization-prone region have the same coercive force. The distribution of heavy rare-earth elements satisfies the following conditions: the concentration ratio △1 of heavy rare-earth elements at a vertical distance of 0.5 mm from a surface layer to heavy rare-earth elements at a vertical distance of 1 mm from the surface layer is 1-1.2; the concentration ratio △2 of heavy rare-earth elements at a vertical distance of 1 mm from the surface layer to heavy rare-earth elements at a vertical distance of 1.5 mm from the surface layer is 1-1.25; and the concentration ratio △3 of heavy rare-earth elements at a vertical distance of 1.5 mm from the surface layer to heavy rare-earth elements at a vertical distance of 2 mm from the surface layer is 1-1.3. The neodymium-iron-boron magnet can ensure a high coercive force, high thermal stability, high squareness and a high magnetic torque while reducing the amount of heavy rare earth in the neodymium-iron-boron magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 7/02 - Permanent magnets
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
• H02K 1/27 - Rotor cores with permanent magnets

Abstract

The invention discloses a neodymium-iron-boron magnet material, a preparation method, and use thereof. The neodymium-iron-boron magnet material comprises following components of: R: 28.00-32.00 wt %, wherein the R is a rare earth element; Al: 0.00-1.00 wt %; Cu: 0.12-0.50 wt %; B: 0.85-1.10 wt %; and a balance of Fe, wherein wt % refers to a weight percentage of respective elements in the neodymium-iron-boron magnet material; a volume percentage of a Nd—O phase having a FCC type crystal structure in an intergranular triangular zone of the neodymium-iron-boron magnet material in a grain boundary phase of the neodymium-iron-boron magnet material is equal to or less than 20%. By reducing the proportion of the Nd—O phase having the FCC type crystal structure, the present invention enhances the demagnetizing coupling ability of the grain boundary phase and improves the consistency of the intrinsic coercivity of the magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper

Abstract

The present disclosure relates to a neodymium-iron-boron substrate and a preparation method for a neodymium-iron-boron magnet. The neodymium-iron-boron substrate is in a sintered state, wherein a difference between the area fraction of a grain boundary parallel to the easy-to-magnetize direction of the substrate and the area fraction of a grain boundary vertical to the easy-to-magnetize direction is less than or equal to 1%. In the embodiments of the present disclosure, the neodymium-iron-boron substrate of the present disclosure is obtained by sintering a powder composition, which is obtained by mixing a raw neodymium-iron-boron alloy powder with an alloy powder consisting of R and M, wherein the mass ratio of R to M is x:(100-x), R is one or more of Nd and Pr, M is one of or a combination of two or more of Cu, Al, Ga and Zn, x is the mass fraction of R, and 0

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

The present disclosure relates to a powder composition and a method for preparing a neodymium-iron-boron magnet. The composition comprises a first powder component and a second powder component, wherein the first powder component is alloy powder composed of R and M, the mass ratio of R to M is x: (100-x), R is one or more of Nd and Pr, M is one or a combination of two or more of Cu, Al, Ga and Zn, x is the mass fraction of R, and 0≤x≤90; and the second powder component is raw material neodymium-iron-boron alloy powder. According to the embodiments of the present disclosure, the powder composition of the present disclosure is suitable for preparing a base material having smaller heavy rare earth diffusion anisotropy, so that the powder composition can be used for further manufacturing a rare earth permanent magnet material having excellent performance.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

Disclosed are an R-T-B magnet and a preparation method therefor. The R-T-B magnet comprises the following components: R≥29 wt. %, R being a rare earth element and containing Nd, wherein Nd is ≥22 wt. %; 0.2-0.75 wt. % of Ti+Nb; 0.05-0.45 wt. % of Cu; 0.955-1.15 wt. % of B; and 58-69 wt. % of Fe, wherein wt. % is the ratio of the mass of each component to the total mass of the components; and the mass ratio of Ti to Nb is (1-5):1. According to the present invention, the matching relationship among the added elements in the R-T-B magnet is further optimized, and an R-T-B magnet with better magnetic properties such as relatively high residual magnetization, coercivity, and squareness can be prepared by using the formula.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C21D 1/84 - Controlled slow cooling
• C21D 6/00 - Heat treatment of ferrous alloys
• C22C 33/04 - Making ferrous alloys by melting
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. The neodymium-iron-boron magnet comprises a main phase crystal grain, a shell layer of the main phase crystal grain and a Nd-rich phase adjacent to the main phase crystal grain, wherein the main phase crystal grain comprises Nd2Fe14B; or the main phase crystal grain comprises Nd2Fe14B and Pr2Fe14B; the shell layer comprises (Nd/Dy)2Fe14B and/or (Nd/Tb)2Fe14B; the shell layer has a thickness of 0.1-6 μm; the Nd-rich phase comprises a R6Fe13B phase, wherein the R is one or more selected from the group consisting of Nd, Pr, Dy and Tb. The method of the invention effectively reduces the diffusion amount of the heavy rare earth elements into the main phase, forms a thinner heavy rare earth shell layer, and can further optimize and improve the high temperature performance of the magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 33/06 - Making ferrous alloys by melting using master alloys
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper

Goods & Services

Semiconductor wafers; magnets; light emitting diodes; galena crystals [detectors]; silicon wafers; wafers for integrated circuits; transistors; particle accelerators; lasers, not for medical purposes; solar wafers.

Goods & Services

(1) Semiconductor wafers; magnets for industrial purposes; light emitting diodes; silicon wafers; wafers for integrated circuits; transistors; particle accelerators; solar wafers.

Goods & Services

Semiconductor wafers; magnets; light emitting diodes; silicon wafers; wafers for integrated circuits; transistors; particle accelerators; lasers, not for medical purposes; solar wafers

Abstract

abcdefghijkmnopp, R being a rare earth element; and (2) performing grain boundary diffusion on the sintered body obtained from step (1) and a diffusion source raw material composition. The present invention can improve the magnetic performance of magnets containing high-abundance rare earths by constructing a composite magnetic hardening shell layer.

IPC Classes  ?

• H01F 1/053 - Alloys characterised by their composition containing rare earth metals
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 1/06 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
• H01F 1/08 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together

Abstract

1122121212333<500 nm. The present invention improves the magnetic performance of a magnet containing high-abundance rare earth by means of construction of a composite magnetically-hardened shell layer.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Goods & Services

Semiconductor wafers; Magnets; Light emitting diodes; Galena crystals [detectors]; Silicon wafers; Wafers for integrated circuits; Transistors; Particle accelerators; Lasers, not for medical purposes; Solar wafers.

Abstract

21414B; the grain boundary phase is distributed between the main phase grains; and relative to the grain boundary phase, the volume fraction of an R-N rich region in the grain boundary phase is less than 10%. The nitrogen in the R-T-B-based permanent magnet of the present invention is uniformly distributed at the grain boundary, and an NdN agglomerate is not formed or the content thereof is extremely low, such that the coercive force Hcj of the magnet is increased, the high-temperature magnetic loss is reduced, and the corrosion resistance is also improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

The invention discloses a neodymium-iron-boron magnet material, a preparation method and use thereof. The neodymium-iron-boron magnet material comprises the following components of: 28-33 wt % of R, wherein R is a rare earth element, and R comprises Pr and 27-31.5 wt % of Nd; 0.30-1.3 wt % of Al; 0.35-0.6 wt % of Cu; ≥0.85 wt % of Co; 0.98-1.2 wt % of B; ≥0.25 wt % of Nb; 62-69 wt % of Fe, wherein wt % is a percentage of the mass of respective component in the total mass of the neodymium-iron-boron magnet material; and the contents of the Nb and the Pr in the neodymium-iron-boron magnet material satisfy the following formula: Nd/Pr≥58. In the present invention, by optimizing the formula of the neodymium-iron-boron magnet material, the coercivity of the neodymium-iron-boron magnet material prepared is improved while maintaining higher levels of remanence and squareness.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 33/04 - Making ferrous alloys by melting
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

A main and auxiliary alloy-based neodymium-iron-boron magnet material and the preparation method thereof. The raw material composition for the main and auxiliary alloy-based neodymium-iron-boron magnet material includes a main alloy raw material and an auxiliary alloy raw material, wherein the mass percentage of the auxiliary alloy raw material in the raw material composition for the main and auxiliary alloy-based neodymium-iron-boron magnet material is 1.0-15.0 mass %. For the main and auxiliary alloy-based neodymium-iron-boron magnet material prepared by using the raw material composition, the coercivity is increased while high remanence is ensured, and the preparation method therefor can be suitable for engineering applications.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 1/02 - Making non-ferrous alloys by melting
• C22C 30/02 - Alloys containing less than 50% by weight of each constituent containing copper
• H01F 41/00 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties

Abstract

Disclosed in the present invention are a surface treatment method for a permanent magnet, a permanent magnet and a protective film thereof. The surface treatment method for a permanent magnet comprises the following steps: S1, carrying out zirconization treatment on a permanent magnet to obtain a permanent magnet having a zirconium film, wherein the zirconization treatment is carried out at a temperature of 5-40℃ and a pH value of 1.5-6 for 5-30 min; and S2, carrying out passivation treatment on the permanent magnet having the zirconium film, and drying the permanent magnet, wherein the passivation treatment is carried out at a temperature of 15-50℃ and a pH value greater than or equal to 10 for 4-12 min. According to the treatment method of the present invention, the obtained permanent magnet has relatively good moisture resistance and relatively large surface tension; and the treatment method of the present invention reduces pollutant emission, and conforms to the concept of green ecological and environmentally friendly production.

IPC Classes  ?

• C23C 22/80 - Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds
• C23C 22/60 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH > 8
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

An R-T-B magnet includes the following components of: ≥30.0 wt % of R, the R is a rare earth element; 0.02-0.14 wt % of Nb; 0.2-0.48 wt % of Cu; ≤0.24 wt % of Ti+Nb; ≤0.50 wt % of Al+Cu; ≥0.955 wt % of B; and 58-69 wt % of Fe, wherein wt % is the mass percentage of respective component in the total mass of all components. The R-T-B magnet has remanence, coercivity, high-temperature stability and squareness at a better level. A method prepares the R-T-B magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

A R-T-B magnet and a preparation method thereof. The R-T-B magnet includes the following components of: ≥30.0 wt % of R, said R is a rare earth element; 0.16-0.6 wt % of Cu; 0.4-0.8 wt % of Ti; ≤0.2 wt % of Ga; 0.955-1.2 wt % of B; and 58-69% of Fe; wherein wt % is the mass percentage of respective component in the total mass of all components. The R-T-B magnet has higher remanence, coercivity, squareness and high-temperature stability.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

2142433, and the grain boundary phase B is 1-2%. The neodymium-iron-boron rare earth permanent magnet has high Co content, high Curie temperature and a low temperature coefficient, as well as good mechanical properties, high magnetic energy product and high coercivity.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

The present invention provides an N,N-dihydrocarbyl amide carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbyl amide carboxylic acid can be used as an extractant for enriching rare earth elements from raw materials containing low-concentration rare earth elements, separating and purifying yttrium element from mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from mixed rare earth raw material, etc. The compound can be synthesized in a simple and cost-efficient way. As an extractant, it has good chemical stability and can withstand strong acid and strong alkali without decomposition.

IPC Classes  ?

• C07C 235/76 - Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups and doubly-bound oxygen atoms bound to the same carbon skeleton with the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of an unsaturated carbon skeleton
• C07C 231/02 - Preparation of carboxylic acid amides from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
• C07C 233/47 - Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a hydrogen atom or to a carbon atom of an acyclic saturated carbon skeleton
• C07C 233/49 - Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a carbon atom of an acyclic unsaturated carbon skeleton
• C22B 3/32 - Carboxylic acids
• C22B 59/00 - Obtaining rare earth metals

Abstract

The present application provides an N,N-dihydrocarbonyl amino carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbonyl amino carboxylic acid can be used as an extractant for enriching rare earth elements from raw materials containing low-concentration rare earth elements, separating and purifying yttrium element from a mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from a mixed rare earth raw material, etc. The compound can be synthesized in a simple and cost-efficient way. As an extractant, it has good chemical stability and has good resistance against strong acid and strong alkali without decomposition.

IPC Classes  ?

• C07C 233/49 - Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a carbon atom of an acyclic unsaturated carbon skeleton
• C07C 233/47 - Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a hydrogen atom or to a carbon atom of an acyclic saturated carbon skeleton
• C22B 3/32 - Carboxylic acids
• C22B 59/00 - Obtaining rare earth metals

Abstract

Disclosed in the present invention are a heavy rare earth alloy, neodymium-iron-boron permanent magnet material, a raw material, and a preparation method. The heavy rare earth alloy comprises the following components: RH: 30-100 mas %, not including 100 mas %; X, 0-20 mas %, not including 0; B: 0-1.1 mas %; and Fe and/or Co: 15-69 mas %, RH comprising one or more heavy rare earth elements in Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sc, and X being Ti and/or Zr. When the heavy rare earth alloy of the present invention is used as a sub-alloy to prepare the neodymium-iron-boron permanent magnet material, a high utilization rate of heavy rare earth is achieved, so that the coercivity can also be greatly improved while the neodymium-iron-boron permanent magnet material maintains high remanence.

IPC Classes  ?

• H01F 1/055 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
• C22C 28/00 - Alloys based on a metal not provided for in groups
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• C22C 33/02 - Making ferrous alloys by powder metallurgy

Abstract

Disclosed are an R-T-B-based permanent magnet material, a preparation method therefor and the use thereof. The R-T-B-based permanent magnet material comprises R, B, M, Fe, Co, X and inevitable impurities, wherein: (1) R is a rare earth element, and the R includes at least Nd and RH, M being one or more of Ti, Zr and Nb, and X including Cu, “Al and/or Ga”; and (2) in percentage by weight, R: 30.5-32.0 wt%, B: 0.95-0.99 wt%, M: 0.3-0.6 wt%, X: 0.8-1.8 wt%, and Cu: 0.35-0.50 wt%, and the balance is Fe, Co and inevitable impurities. According to the present invention, under the condition of 0.3-0.6 wt% of a high melting point metal, a permanent magnet material with an excellent magnet performance and a good squareness is obtained.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 33/02 - Making ferrous alloys by powder metallurgy

Abstract

Provided are a neodymium-iron-boron magnet material, raw material composition, preparation method, and application. The raw material composition of the neodymium-iron-boron magnet material comprises the following mass content components: R: 28-33%; R is a rare earth element, R comprises R1 and R2; R1 is a rare earth element added during smelting, and R1 comprises Nd and Dy; R2 is a rare earth element added during grain boundary diffusion, R2 comprises Tb, the content of R2 is 0.2%-1%; Co: <0.5%, but not 0; M: ≤0.4%, but not 0, and M is one or more of Bi, Sn, Zn, Ga, In, Au, and Pb; Cu: ≤0.15%, but not 0; B: 0.9-1.1%; Fe: 60-70%; the percentage is the mass percentage of the mass of each component to the total mass of the raw material composition. The neodymium-iron-boron magnet material has high remanence, coercivity, and good thermal stability.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/10 - Sintering only
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling

Abstract

Disclosed are a neodymium-iron-boron magnet material, a raw material composition, a preparation method therefor and a use thereof. The raw material composition of the neodymium-iron-boron magnet material comprises the following components in weight content: R: 28-33%; R being rare earth elements, and comprising R1 and R2, R1 being a rare earth element added during smelting, R1 comprising Nd and Dy, R2 being a rare earth element added during grain boundary diffusion, R2 comprising Tb, and the content of R2 being 0.2-1%; M: ≤0.4% but not 0, M being one or more elements among Bi, Sn, Zn, Ga, In, Au and Pb; Cu: ≤0.15% but not 0; B: 0.9-1.1%; Fe: 60-70%; but not containing Co. The neodymium-iron-boron magnet material under the condition of adding a small amount of heavy rare earth elements and not adding cobalt, can still have a relatively high coercivity and remanence, and excellent thermal stability.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

An R-T-B-based sintered magnet and a preparation method therefor. The R-T-B-based sintered magnet comprises: R, B, Ti, Ga, Al, Cu, and T. The contents thereof are as follows: R is 29.0-33%; the content of B is 0.86-0.93%; the content of Ti is 0.05-0.25%; the content of Ga is 0.3-0.5%, but not 0.5%; the content of Al is 0.6-1%, but not 0.6%; the content of Cu is 0.36-0.55%. The percentage is the mass percentage. Under the condition that no heavy rare earth is added or a small amount of heavy rare earth is added, by using a low B technology, not only the remanence performance of the R-T-B-based sintered magnet is improved, but also the coercivity and the squareness of the magnet are ensured.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• B22F 3/10 - Sintering only
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling

Abstract

A neodymium-iron-boron permanent magnet material, a preparation method, and an application. The neodymium permanent magnet material includes R, Al, Cu, and Co; R comprises RL and RH; RL comprises one or many light rare earth elements among Nd, La, Ce, Pr, Pm, Sm, and Eu; RH comprises one or many heavy rare earth elements among Tb, Gd, Dy, Ho, Er, Tm, Yb, Lu, and Sc; the neodymium-iron-boron permanent magnet material satisfies the following relations: (1) B/R: 0.033-0.037; (2) AI/RH: 0.12-2.7. The neodymium-iron-boron permanent magnet material has uniquely advantageous magnetic and mechanical properties, with Br≥13.12 kGs, Hcj≥17.83 kOe, and bending strength≥409 MPa.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 33/02 - Making ferrous alloys by powder metallurgy
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 3/10 - Sintering only
• B22F 3/24 - After-treatment of workpieces or articles

Abstract

A neodymium-iron-boron magnetic material, a preparation method therefor and an application thereof. The neodymium-iron-boron magnetic material comprises the following components in percentage by mass: 29.5-31.5 wt. % of R, where RH>1.5 wt. %; 0.05-0.25 wt. % of Cu; 0.42-2.6 wt. % of Co; 0.20-0.3 wt. % of Ga; 0.25-0.3 wt. % of N; 0.46-0.6 wt. % of Al, or alternatively Al is less than or equal to 0.04 wt. % but is not 0; 0.98-1 wt. % of B; and 64-68 wt. % of Fe; wherein R is a rare-earth element and comprises Nd and RH, RH is a heavy rare-earth element and comprises Tb, and a mass ratio of Tb to Co is less than or equal to 15 but is not 0. The neodymium-iron-boron magnetic material has higher Hcj and Br, and lower absolute values of temperature coefficients of Br and Hcj.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys

Abstract

An R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application. The R-T-B series permanent magnet material comprises the following components: R: 29-31.0 wt. %, RH is greater than 1 wt. %, B: 0.905-0.945 wt. %, C: 0.04-0.15 wt. %, N: 0.1-0.4 wt. %, and Fe: 67-69 wt. %, wherein R comprises RL and RH, RL is a light rare earth element, RL comprises Nd, RH is a heavy rare earth element, a (RL1-yRHy)2T17Cx phase is present at the grain boundary of the R-T-B series permanent magnet material, x: 2-3, y: 0.15-0.35, and T must comprise Fe, and also comprises one or more among Co, Ti and N. The permanent magnet material retains relative high Br and Hcj under different heat treatment temperatures.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling

Abstract

Disclosed are a neodymium-iron-boron magnet material, a raw material composition, a preparation method therefor and a use thereof. The raw material composition of the neodymium-iron-boron magnet material comprises the following components by mass percentage: 29.5-32.8% of R′, wherein R′ includes Pr and Nd, and Pr≥17.15%; Al≥0.5%; 0.90-1.2% of B; and 60-68% of Fe. The percentages are the mass percentages relative to the total mass of the raw material composition of the neodymium-iron-boron magnet material. Without adding a heavy rare earth element to the neodymium-iron-boron magnet material, the performance of the neodymium-iron-boron magnet material can still be significantly improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 33/00 - Making ferrous alloys
• C22C 33/04 - Making ferrous alloys by melting

Abstract

Disclosed in the present invention is an R—Fe—B sintered magnet and grain boundary diffusion treatment method. The R—Fe—B sintered magnet is obtained by performing HR grain boundary diffusion treatment on an R—Fe—B sintered green body, wherein the green body at least comprises 28 wt %-33 wt % of R, which is at least one rare earth element including Nd; 0.83 wt %-0.96 wt % of B; and 0.3 wt %-1.2 wt % of M. A grain boundary diffusion direction is perpendicular to a magnetization direction, and in the diffusion direction, the ratio of HR contents of any two points spaced from the diffusion plane by a distance of no more than 500 μm is 0.1-1.0. Grain boundary diffusion of a diffusion source is performed in a direction perpendicular to c axis, so that local demagnetization is efficiently controlled, a diffusion effect is enhanced, a manufacturing procedure is simplified, and deformation factors are eliminated.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

A high-Cu and high-Al neodymium iron boron magnet and a preparation method therefor. The high-Cu and high-Al neodymium iron boron magnet comprises: 29.5-33.5% R, over 0.985% B, over 0.50% Al, over 0.35% Cu, over 1% RH, and 0.1-0.4% high-melting-point elements N and Fe, wherein the percentages are the mass percentages of the elements in the total amount of elements, and the mass percentages of the element contents must satisfy the following relationships: (1) 1

IPC Classes  ?

• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

Disclosed are a neodymium-iron-boron magnet material, a raw material composition, a preparation method therefor and a use thereof. The raw material composition of the neodymium-iron-boron magnet material comprises the following components by mass percentage: 29.5-32% of R′, wherein R′ is a rare earth element and includes Pr and Nd; and Pr≥17.15%; 0.25-1.05% of Ga; 0.9-1.2% of B; and 64-69% of Fe. Without adding a heavy rare earth element to the neodymium-iron-boron magnet material, the remanence and coercive force of the resulting neodymium-iron-boron magnet material are both relatively high.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys

Abstract

An RIB-based permanent magnet material, a preparation method thereof, and an application thereof. The RIB-based permanent magnet material comprises the following components: R′: 29.5 to 33.5 wt. %, wherein R′ comprises Pr, and the content of Pr is ≥8.85 wt. %; C:0.106 to 0.26 wt. %; O: ≤0.07 wt. %; X: 0 to 5.0 wt. %, wherein X is one or more of Cu, Al, Ga, Co, Zr, Ti, Nb and Mn; B:0.90 to 1.2 wt. %; and Fe:61.4 to 69.5 wt. %. The RIB-based permanent magnet material can improve the performance of a permanent magnet material without employing heavy rare earths. There is no need to control the content of carbon introduced in the process, and the magnet exhibits excellent performance even with a high carbon content.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 33/02 - Making ferrous alloys by powder metallurgy

Abstract

An R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application. An R-T-B series permanent magnet material I comprises R, T and X, which satisfy the following relational formula: (1) the atomic ratio of (Fe+Co)/B is 12.5-13.5; (2) the atomic ratio of B/X is 2.7-4.1; and X is one or more among Al, Ga and Cu. The permanent magnet material I comprises R2T14B primary phase crystalline particles, and a secondary grain boundary phase and a rare earth rich phase between two adjacent R2T14B primary phase crystalline particles. The secondary grain boundary phase and rare earth rich phase comprise phases composed of R6T13X. R6T13X phases are formed in the R-T-B series permanent magnet material I, so that Hcj and mechanical performance can be synchronously improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium

Abstract

Disclosed are an R-T-B-based permanent magnet material, a preparation method therefor and the use thereof. The R-T-B-based permanent magnet material I comprises the following components: 29.0-32.5% of R including RH, 0.30 to 0.50 wt. % of Cu, 0.05 to 0.20 wt. % of Ti, 0.85 to 1.05 wt. % of B, 0.1 to 0.3 wt. % of C, 66 to 68 wt. % of Fe, wherein R is a rare earth element and R at least includes Nd; and RH is a heavy rare earth element and RH at least includes Tb or Dy, A Cu—Ti—C grain boundary phase is formed in the R-T-B-based permanent magnet material I, and Hcj is significantly improved.

IPC Classes  ?

• H01F 1/055 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• H01F 1/058 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IVa elements, e.g. Gd2Fe14C

Abstract

An R-T-B permanent magnet material and a preparation method therefor and a use thereof. The R-T-B permanent magnet material comprises the following components: R′, which is between 29.5 wt. % and 33.0 wt. %, the R comprising R, Pr, and Nd, R being a rare earth element other than Pr and Nd, the Pr content being greater than or equal to 8.85 wt. %, the mass ratio of Nd to R being less than 0.5; N, which is greater than 0.05 wt. %, and less than or equal to 4.1 wt. %, the N being Ti, Zr, or Nb; B, which is between 0.90 wt. % and 1.2 wt. %; and Fe, which is between 62.0 wt. % and 68.0 wt. %. A sintered permanent magnet product having a high coercive force and a stable temperature coefficient is prepared by using a formulation having a high Pr content. The described formulation can maximally exert the advantage of Pr, and effectively reduce production costs.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys

Abstract

Disclosed are a neodymium-iron-boron magnet material, a raw material composition and a preparation method therefor and a use thereof. The raw material composition of the neodymium-iron-boron magnet material comprises the following components by mass percentage: 29.5-32% of R′, wherein R′ is a rare earth element and includes Pr and Nd; and Pr≥17.15%; Cu≥0.35%; 0.9-1.2% of B; 64-69.2% of Fe. The percentages refer to the mass percentages relative to the total mass of the raw material composition of the neodymium-iron-boron magnet material. Without the addition of a heavy rare earth element, the neodymium-iron-boron magnet material can still have a high remanence and coercive force.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

A rare earth permanent magnet material, a raw material composition, a preparation method, an application, and a motor. The present rare earth permanent magnet material comprises the following ingredients in mass percentage: R 28.5-33.0 wt. %; RH>1.5 wt. %; Cu 0-0.08 wt. %, but not 0 wt. %; Co 0.5-2.0 wt. %; Ga 0.05-0.30 wt. %; B 0.95-1.05 wt. %; and the remainder being Fe and unavoidable impurities. The R-T-B system permanent magnet material has excellent properties and, under the condition that the content of heavy rare earth elements in the permanent magnetic material is 3.0-4.5 wt. %, Br≥12.78 kGs and Hcj≥29.55 kOe; under the condition that the content of heavy rare earth elements in the permanent magnet material is 1.5-2.5 wt. %, Br≥13.06 kGs and Hcj≥26.31 kOe.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

A rare earth permanent magnet material and a raw Material composition, a preparation method therefor and use thereof. The rare earth permanent magnet material comprises the following components in percentage by mass: 29.0-32.0 wt. % of R, where R comprises RH, and the content of RH is greater than 1 wt. %; 0.30-0.50 wt. % of Cu (not including 0.50 wt. %); 0.10-1.0 wt. % of Co; 0.05-0.20 wt. % of Ti; 0.92-0.98 wt. % of B; and the remainder being Fe and unavoidable impurities; wherein R is a rare-earth element and at least comprises Nd; and RH is a heavy rare-earth element and at least comprises Tb. The R-T-B system permanent magnet material exhibits excellent performance, wherein Br≥14.30 kGs, and Hcj≥24.1 kOe. The invention can synchronously improve Br and Hcj.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 33/02 - Making ferrous alloys by powder metallurgy
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

Disclosed are a device and method for continuously performing grain boundary diffusion and heat treatment, characterized in that the alloy workpiece or the metal workpiece are arranged in a relatively independent processing box together with a diffusion source; the device comprises, in successive arrangement, a grain boundary diffusion chamber, a first cooling chamber, a heat treatment chamber, and a second cooling chamber, and a transfer system provided between various chambers for delivering the processing box; each of the first cooling chamber and the second cooling chamber uses an air cooling system, and the cooling air temperature of the first cooling chamber is above 25° C. and at least differs by 550° C. from the grain boundary diffusion temperature of the grain boundary diffusion chamber; the cooling air temperature of the second cooling chamber is above 25° C. and at least differs by 300° C. from the heat treatment temperature of the heat treatment chamber; and the cooling chamber has a pressure of 50 kPa to 100 kPa. The device provided by the present invention can increase the cooling rate and production efficiency, and improve product consistency.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
• B22F 3/24 - After-treatment of workpieces or articles
• C21D 1/613 - GasesLiquefied or solidified normally gaseous material
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• F27B 5/02 - Muffle furnacesRetort furnacesOther furnaces in which the charge is held completely isolated of multiple-chamber type
• F27B 5/04 - Muffle furnacesRetort furnacesOther furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
• F27B 5/18 - Arrangement of controlling, monitoring, alarm or like devices
• F27B 9/02 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity of multiple-track typeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity of multiple-chamber typeCombinations of furnaces
• F27D 9/00 - Cooling of furnaces or of charges therein
• H01L 21/67 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components
• F27B 5/06 - Details, accessories or equipment specially adapted for furnaces of these types

Abstract

Disclosed are a continuous heat treatment device and method for a sintered Nd—Fe—B magnet workpiece. The device comprises a first heat treatment chamber, a first cooling chamber, a second heat treatment chamber, and a second cooling chamber continuously disposed in sequence, as well as a transfer system disposed among the chambers to transfer the alloy workpiece or the metal workpiece; both the first cooling chamber and the second cooling chamber adopt a air cooling system, wherein a cooling air temperature of the first cooling chamber is 25° C. or above and differs from a heat treatment temperature of the first heat treatment chamber by at least 450° C.; a cooling air temperature of the second cooling chamber is 25° C. or above and differs from a heat treatment temperature of the second heat treatment chamber by at least 300° C. The continuous heat treatment device and method can improve the cooling rate and production efficiency and improve the properties and consistency of the products.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
• C21D 1/613 - GasesLiquefied or solidified normally gaseous material
• B22F 3/24 - After-treatment of workpieces or articles
• F27B 9/02 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity of multiple-track typeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity of multiple-chamber typeCombinations of furnaces
• F27D 9/00 - Cooling of furnaces or of charges therein
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• F27B 5/02 - Muffle furnacesRetort furnacesOther furnaces in which the charge is held completely isolated of multiple-chamber type
• F27B 5/04 - Muffle furnacesRetort furnacesOther furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
• F27B 5/18 - Arrangement of controlling, monitoring, alarm or like devices
• H01L 21/67 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components
• F27B 5/06 - Details, accessories or equipment specially adapted for furnaces of these types

Abstract

1+δ series phase of a special composition and increases its volume fraction in grain boundary phases, so as to acquire higher Hcj and SQ values.

IPC Classes  ?

• B22F 3/24 - After-treatment of workpieces or articles
• C22C 33/02 - Making ferrous alloys by powder metallurgy
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

The present invention discloses a grain boundary diffusion method of an R—Fe—B series rare earth sintered magnet, an HRE diffusion source, and a preparation method thereof, comprising the following steps: engineering A of forming a dry layer on a high-temperature-resistant carrier, the dry layer being adhered with HRE compound powder, the HRE being at least one of Dy, Tb, Gd, or Ho; and engineering B of performing heat treatment on the R—Fe—B series rare earth sintered magnet and the high-temperature-resistant carrier treated with the engineering A in a vacuum or inert atmosphere and supplying HRE to a surface of the R—Fe—B series rare earth sintered magnet. The method can reduce the consumption of heavy rare earth element and control the loss of residual magnetism Br while increasing the coercivity.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

14B-type main phase, the R being at least one rare earth element comprising Nd or Pr; the crystal grain boundary of the rare earth magnet contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for 2.0 vol %˜11.0 vol % of the sintered magnet. The sintered magnet uses a minor amount of W pinning crystal to segregate the migration of the pinned grain boundary in the crystal grain boundary to effectively prevent abnormal grain growth and obtain significant improvement. The crystal grain boundary of the quenching alloy contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for at least 50 vol % of the crystal grain boundary.

IPC Classes  ?

• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

14B type main phase, and R is a rare-earth element comprising at least Pr, wherein the raw material components therein comprise more than or equal to 2 wt % of Pr and 0.0005 wt %-0.03 wt % of W; and the rare-earth sintered magnet is made through a process comprising the following steps: preparing molten liquid of the raw material components into a rapidly quenched alloy; grinding the rapidly quenched alloy into fine powder; obtaining a shaped body from the fine powder by using a magnetic field; and sintering the shaped body. By adding a trace amount of W into the rare-earth sintered magnet, the heat resistance and thermal demagnetization performance of the Pr-containing magnet are improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 3/24 - After-treatment of workpieces or articles
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

The present invention discloses a method of manufacturing, powder making device for rare earth magnet alloy powder, and a rare earth magnet. The method comprises a process of fine grinding at least one kind of rare earth magnet alloy or at least one kind of rare earth magnet alloy coarse powder in inert jet stream with an oxygen content below 1000 ppm to obtain powder that has a grain size smaller than 50 μm. Low oxygen content ultra-fine powder having a grain size smaller than 1 μm is not separated from the pulverizer, and the oxygen content of the atmosphere is reduced to below 1000 ppm in the pulverizer when crushing the powder. Therefore, abnormal grain growth (AGG) rarely happens in the sintering process. A low oxygen content sintered magnet is obtained and the advantages of a simplified process and reduced manufacturing cost are realized.

IPC Classes  ?

• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 1/053 - Alloys characterised by their composition containing rare earth metals
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• B22F 9/02 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes

Abstract

14B main phase, wherein R is selected from at least one rare earth element including Nd. The average grain diameter of the main phase in the brachyaxis direction is in a range of 10˜15 μm and the average interval of the Nd rich phase is in a range of 1.0˜3.5 μm. In the fine powder of the above-mentioned quenched alloy, the number of magnet domains of a single grain decreases. Thus, it is easier for external magnetic field orientation to obtain high performance magnet, and the squareness, coercivity and the thermal resistance of the magnet are sufficiently improved.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper

Abstract

14B type principal phase, and comprises the following raw material components: R: 28 wt % to 33 wt %, wherein R is a raw-earth element comprising Nd and Ho, and the content of Ho is 0.3 wt % to 5 wt %; B: 0.8 wt % to 1.3 wt %; W: 0.005 wt % to 0.3 wt %, and the balance of T and inevitable purities, wherein T is an element mainly comprising Fe and/or Co. The rare-earth magnet mainly consists of a W-rich grain boundary phase and a Ho-rich principal phase; crystal grain growth of the Ho-containing magnet in a sintering process is constrained by the trace of W, thereby preventing AGG from occurring on the Ho-containing magnet, and obtaining a magnet with high coercivity and high heat resistance.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper

Abstract

14B-type main phase, the R being at least one rare earth element comprising Nd or Pr; the crystal grain boundary of the rare earth magnet contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for 5.0 vol %˜11.0 vol % of the sintered magnet. The sintered magnet uses a minor amount of W pinning crystal to segregate the migration of the pinned grain boundary in the crystal grain boundary to effectively prevent abnormal grain growth and obtain significant improvement. The crystal grain boundary of the quenching alloy contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for at least 50 vol % of the crystal grain boundary.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• H01F 1/053 - Alloys characterised by their composition containing rare earth metals
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets

Abstract

14B and comprises the following raw material components: 13.5 at %˜4.5 at % of R, 5.2 at %˜5.8 at % of B, 0.3 at %˜0.8 at % of Cu, 0.3 at %˜3 at % of Co, and the balance being T and inevitable impurities, the R being at least one rare earth element comprising Nd, and the T being an element mainly comprising Fe. 0.3˜0.8 at % of Cu and an appropriate amount of Co are co-added into the rare earth magnet, so that three Cu-rich phases formed in the grain boundary, and the magnetic effect of the three Cu-rich phases existing in the grain boundary and the solution of the problem of insufficient B in the grain boundary can obviously improve the squareness and heat-resistance of the magnet.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• B22F 3/087 - Compacting only using high energy impulses, e.g. magnetic field impulses
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• C22C 33/04 - Making ferrous alloys by melting
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
• C22C 38/30 - Ferrous alloys, e.g. steel alloys containing chromium with cobalt
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
• C22C 33/02 - Making ferrous alloys by powder metallurgy
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling

Abstract

A manufacturing method of rare earth magnet based on heat treatment of fine powder includes the following: an alloy for the rare earth magnet is firstly coarsely crushed and then finely crushed by jet milling to obtain a fine powder; the fine powder is heated in vacuum or in inert gas atmosphere at a temperature of 100° C.˜1000° C. for 6 minutes to 24 hours; then the fine powder is compacted under a magnet field and is sintered in vacuum or in inert gas atmosphere at a temperature of 950° C.˜1140° C. to obtain a sintered magnet; and machining the sintered magnet to obtain a magnet; then the magnet performs a RH grain boundary diffusion at a temperature of 700° C.˜1020° C. An oxidation film forms on the surface of all of the powder.

IPC Classes  ?

• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01F 1/053 - Alloys characterised by their composition containing rare earth metals
• C21D 6/00 - Heat treatment of ferrous alloys
• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium

Abstract

A manufacturing method of an alloy powder for rare earth magnet and the rare earth magnet based on heat treatment includes the following: an alloy of the rare earth magnet is firstly coarsely crushed and then finely crushed by jet milling to obtain a fine powder; the fine powder is obtained by being heated in vacuum or in inert gas atmosphere at a temperature of 100° C.˜1000° C. for 6 minutes to 24 hours. The heat treatment of fine powder is performed after the process of finely crushed jet milling before the process of compacting under a magnetic field, so that the sintering property of the powder is changed drastically, and it obtains a magnet with a high coercivity, a high squareness and a high heat resistance.

IPC Classes  ?

• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• C21D 6/00 - Heat treatment of ferrous alloys
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 3/16 - Both compacting and sintering in successive or repeated steps
• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
• C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
• H01F 1/053 - Alloys characterised by their composition containing rare earth metals

Abstract

The present invention discloses a manufacturing method of green compacts of rare earth alloy magnetic powder and a manufacturing method of rare earth magnet, it is a manufacturing method that pressing the rare earth alloy magnetic powder added with organic additive in a closed space filled with inert gases to manufacture the green compacts, wherein the rare earth alloy magnetic powder is compacted under magnetic field in a temperature atmosphere of 25° C.-50° C. and a relative humidity atmosphere of 10%-40%. This method is to set the temperature of the inert atmosphere in a fully closed space, inhibiting bad forming phenomenon of the magnet with low oxygen content (broken, corner-breakage, crack) after sintering, and increasing the degree of orientation, Br and (BH)max.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• B22F 3/12 - Both compacting and sintering
• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• B22F 3/14 - Both compacting and sintering simultaneously
• B22F 3/24 - After-treatment of workpieces or articles
• H01F 1/08 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together

Abstract

The present invention discloses manufacturing methods of a powder for compacting rare earth magnet powder and rare earth magnet that omit jet milling process, which comprises the steps as follows: 1) casting: casting the molten alloy of rare earth magnet raw material by strip casting method to obtain a quenched alloy with average thickness in a range of 0.2˜0.4 mm; 2) hydrogen decrepitation: decrepitating the quenched alloy and a plurality of rigid balls into a rotating hydrogen decrepitation container simultaneously, the quenched alloy is crushed under a hydrogen pressure between 0.01˜1 MPa, cooling the alloy and the balls, then screening the mixture to remove the rigid balls and obtain the powder. As the jet milling process is omitted, the oxygenation during the process of the jet milling may be avoided, therefore the process may be non-oxide, and the mass production of magnet with super high property may be possible.

IPC Classes  ?

• H01F 1/057 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/10 - Ferrous alloys, e.g. steel alloys containing cobalt
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
• C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
• C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
• B22F 3/04 - Compacting only by applying fluid pressure
• B22F 3/12 - Both compacting and sintering
• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• C22C 38/30 - Ferrous alloys, e.g. steel alloys containing chromium with cobalt
• H01F 1/055 - Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets