Abstract

The present invention provides a preparation process of a slurry for sintered neodymium-iron-boron silk-screen printing, and relates to the technical field of silk-screen printing. The process comprises the following steps: crushing a fluoride R1F3 and a hydride R2H3 into a powder, uniformly mixing same to obtain a powder mixture, dissolving the powder mixture in a solvent, and then sequentially adding a defoaming agent and a macromolecular resin to prepare a heavy rare earth suspension slurry. By means of the slurry prepared by the process of the present invention, the slurry has a strong adhesive force and a short drying time after printing, and does not block the screen printing plate; moreover, the coercive force of neodymium-iron-boron can be greatly improved; in addition, the effects of magnetron sputtering and coating can be achieved. The equipment has a low manufacturing cost and is suitable for industrial batch production.

IPC Classes  ?

• C09D 11/107 - Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
• C09D 11/03 - Printing inks characterised by features other than the chemical nature of the binder

Abstract

The present invention relates to the technical field of paints, and disclosed are a sintered neodymium iron boron grain boundary diffusion anti-adhesion coating and an application thereof. The anti-adhesion coating comprises a bottom layer and a surface layer; the raw material of the bottom layer is a coupling agent; and the surface layer is prepared from the following raw materials in parts by weight: 5-8 parts of molybdenum sulfide powder, 10-20 parts of epoxy resin, and 30-50 parts of an organic solvent. The anti-adhesion coating of the present invention is sprayed to the surface of a sintered neodymium iron boron magnetic steel, such that adhesion between products can be well avoided, whole-process operation automation is achieved, time and labor are saved, and production efficiency is improved; and the coating is simple, easy to use, and suitable for popularization.

IPC Classes  ?

• C10M 113/08 - Metal compounds
• C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins
• 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 41/00 - 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

The present invention relates to the technical field of magnet processing, and provides a post-cutting treatment method for a neodymium magnet. A neodymium magnet is cut into N neodymium magnets, N being a natural number greater than or equal to 2; an insulation layer slurry is treated in a pulsed magnetic field, and is then sprayed onto the surfaces of N-1 neodymium magnets formed after cutting, forming insulation layers; sintering and curing are performed at 500-800ºC for 1.5-3 h; then an adhesive layer slurry is sprayed onto the insulation layers, forming adhesive layers; and then the magnets are placed on a clamping tool for pressure clamping, are cured at 300-400ºC for 1-3 h, and are cooled to room temperature naturally. In the present invention, a neodymium magnet is divided into blocks, and an insulation layer slurry is sprayed on the divided neodymium magnets to achieve the purpose of insulation between the neodymium magnets. Moreover, the firm bonding of the neodymium magnets is implemented by means of an adhesive, thereby reducing eddy currents in the neodymium magnets. Meanwhile, cobalt powder penetrates into the neodymium magnets, thereby effectively improving the coercivity of the neodymium magnets.

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