A monofilament (100) for producing an Nb3 Sn-containing superconductor wire (33) includes a powder core (1) with an Sn-containing powder, a reaction tube (3) composed of an Nb alloy that includes Nb and at least one further alloy component X. The powder core is disposed within the reaction tube. The monofilament also includes at least two sources (4) for at least one partner component Pk. A respective source includes one or more source structures at a unitary radial position in the monofilament. The source structures are at different radial positions. The alloy component X and the partner component Pk form precipitates XPk on reaction annealing of the monofilament in which Sn from the powder core and Nb from the reaction tube react to produce Nb3 Sn. The powder core is disposed in a moderation tube, which is disposed within the reaction tube. This provides a monofilament with improved current carrying capacity.
B22F 5/12 - Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of tubes or wires
B22F 7/04 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite layers with one or more layers not made from powder, e.g. made from solid metal
c) in an internally and externally round outer tube (19; 52). To the inside the filling elements form a serrated profile (25) for abutment against the hexagonal subelements, and to the outside they form a round profile (24) for direct or indirect abutment in the outer tube. In fabricating the RRP subelements, and before a reshaping with a reduction in cross section, an externally hexagonal and internally round casing structure (9) is provided, into which the remaining parts of the subelements are inserted, in particular, an annular arrangement of hexagonal Nb-containing rod elements (4), which are surrounded externally by an outer matrix (7, 61) and internally by an inner matrix (3).
H01L 39/24 - Processes or apparatus specially adapted for the manufacture or treatment of devices provided for in group or of parts thereof
H01F 6/06 - Coils, e.g. winding, insulating, terminating or casing arrangements therefor
4.
SUBELEMENT BASED ON NB-CONTAINING ROD ELEMENTS WITH POWDER-FILLED CORE TUBE FOR AN NB3SN-CONTAINING SUPERCONDUCTOR WIRE, AND ASSOCIATED PRODUCTION METHOD
The invention relates to a subelement (1) for an Nb3Sn-containing superconductor wire (55), the subelement (1) being designed with - an Sn-containing core (2), - an inner matrix (5) which contains Cu and surrounds the Sn-containing core (2), - a region (7) of Nb-containing rod elements (8, 30) bearing against one another, which region surrounds the inner matrix (5), the Nb-containing rod elements (8, 30) each being designed with an Nb-containing core filament (9; 31) and a Cu-containing filament shell (10), the Nb-containing rod elements (8, 30) in particular each having a hexagonal outer cross-section, - an outer matrix (6) which contains Cu and surrounds the region (7) of Nb-containing rod elements (8, 30), characterised in that the Sn-containing core (2) comprises a core tube (3), which is filled with an Sn-containing powder (4), wherein the Sn-containing powder (4) is in a compressed state. The invention provides a subelement for an Nb3Sn-containing superconductor wire with which improved superconductive current-carrying capacity can be achieved in a simple and cost-effective manner.
In summary, the invention proposes using a finished conductor arrangement (20; 50) for producing an Nb3Sn superconductor wire (33) in accordance with the RRP principle, in which arrangement hexagonal RRP subelements (1a; 60a) are combined to form a bundle which is approximately circular in cross section and are arranged, together with filler elements (18a -18c), in an external pipe (19; 52) which is round on the inside and on the outside. The filler elements (18a -18c) form, on the inside, a jagged profile (25) for making contact with the hexagonal subelements (1a; 60a) and, on the outside, a round profile (24) for direct or indirect contact in the external pipe. In this way, non-uniform deformations, in particular indentations, on the subelements (1a, 60a) are minimized during cross-section-reducing reshaping of the finished conductor arrangement (20, 50). For the manufacture of the RRP sub-elements (1; 60), the invention proposes manufacturing the RRP subelements before cross-section-reducing reshaping with an externally hexagonal and internally round shell structure (9) into which the remaining parts of the sub-element (1; 60) are inserted, in particular an annular arrangement of hexagonal Nb-containing rod elements (4) which are surrounded on the outside by an external matrix (7, 61) and on the inside by an internal matrix (3). In turn, non-uniform deformations, in particular azimuthal material redistributions, are minimized during subsequent cross-section-reducing reshaping of the subelements (1; 60). Overall, it is possible to obtain an Nb3Sn superconductor wire (33) with a high superconducting current-carrying capacity and minimized risk of Sn impurities in normally conducting regions, and therefore a good protective function in the event of quenching.
B22F 5/12 - Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of tubes or wires
B22F 7/04 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite layers with one or more layers not made from powder, e.g. made from solid metal
A method for the production of a superconducting wire (20) uses a monofilament (1) having a powder core (3) that contains at least Sn and Cu, an inner tube (2), made of Nb or an alloy containing Nb, that encloses the powder core (3), and an outer tube (4) in which the inner tube (2) is arranged. The outer side of the inner tube (2) is in contact with the inner side of the outer tube (4) and the outer tube (4) is produced from Nb or from an alloy containing Nb. The outer tube is disposed in a cladding tube. The superconducting current carrying capacity of the superconducting wire is thereby improved.
B22F 5/12 - Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of tubes or wires
H01L 39/24 - Processes or apparatus specially adapted for the manufacture or treatment of devices provided for in group or of parts thereof
B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
B22F 3/20 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sinteringApparatus specially adapted therefor by extruding
B22F 7/04 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite layers with one or more layers not made from powder, e.g. made from solid metal
C22C 30/02 - Alloys containing less than 50% by weight of each constituent containing copper
H01F 6/06 - Coils, e.g. winding, insulating, terminating or casing arrangements therefor
H01F 41/04 - 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 for manufacturing coils
H01L 39/12 - Devices using superconductivity or hyperconductivity; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof - Details characterised by the material
8.
Method for producing a semifinished product for a superconducting wire
A method for producing a semifinished product for a superconducting wire is provided herein. The semifinished product includes at least one NbTi-containing structure, such as a NbTi-containing rod structure. The NbTi-containing structure may be produced in layers by selective laser melting or selective electron beam melting of a powder that contains Nb and Ti. In the production of at least some layers of the NbTi-containing structure, during the production of an irradiated area provided for a material deposition of a respective layer, at least one process parameter of the selective laser melting or electron beam melting is varied in one or a plurality of first zones of the irradiated area as compared to one or a plurality of second zones of the irradiated area. The present techniques simplify introduction of artificial pinning centers into the NbTi-material of a superconducting wire or a semifinished product for such a superconducting wire.
H01B 12/00 - Superconductive or hyperconductive conductors, cables or transmission lines
H01L 39/12 - Devices using superconductivity or hyperconductivity; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof - Details characterised by the material
9.
Method for producing an at least two-part structure, in particular a semifinished product for a superconducting wire
A method for producing an at least two-part structure, such as a semifinished product for a superconducting wire is provided. A first structure and a second structure are separately produced, and the first structure and the second structure are then inserted one into the other. The first structure and the second structure are respectively produced in layers by selective laser melting or selective electron beam melting of a powder. The method produces two-part structures for semifinished products of superconducting wires.
H01L 39/24 - Processes or apparatus specially adapted for the manufacture or treatment of devices provided for in group or of parts thereof
H01L 39/12 - Devices using superconductivity or hyperconductivity; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof - Details characterised by the material
A semifinished wire (1) for a superconducting wire containing Nb3Sn has a Cu stabilization cladding tube (2), a ring-shaped closed diffusion barrier (3) in the inside of the Cu stabilization cladding tube (2) and a plurality of PIT elements (6) in the inside of the diffusion barrier (3), each having a cladding (8) containing Cu, a small tube (9), and a powder core (10) containing Sn. The small tube (9) consists of Nb or an alloy containing Nb and the diffusion barrier (3) has a percentage of area ADF in cross-section of the semifinished wire (1) of 3% ADF 9% and a wall thickness WDF with 8 μm≦WDF≦25 μm. A plurality of filler elements (5) are arranged inside the diffusion barrier (3), with the inner sides of the filler elements (5) abutting the PIT elements (6).
A superconducting wire (12), containing NbTi superconducting material and Cu, comprising a multiplicity of hexagonal elements, which, as seen in cross-section perpendicular to the longitudinal direction of the superconducting wire (12), have an at least approximately hexagonal outside contour is characterized in that at least a portion of the hexagonal elements is constituted as Cu—Al composite elements (3), wherein, in cross-section perpendicular to the longitudinal direction of the superconducting wire (12), the Cu—Al composite elements (3) are each constituted with an Al core (4) and a Cu sheath (5) that surrounds the Al core (4). The NbTi superconducting wire is thereby stabilized and has low weight as well as a reduced risk of crack formation during manufacturing, especially during wire drawing.
H01B 12/00 - Superconductive or hyperconductive conductors, cables or transmission lines
H01L 39/00 - Devices using superconductivity or hyperconductivity; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof
H01B 12/10 - Multi-filaments embedded in normal conductors
H01B 12/00 - Superconductive or hyperconductive conductors, cables or transmission lines
H01B 13/00 - Apparatus or processes specially adapted for manufacturing conductors or cables
H01L 39/12 - Devices using superconductivity or hyperconductivity; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof - Details characterised by the material
H01L 39/24 - Processes or apparatus specially adapted for the manufacture or treatment of devices provided for in group or of parts thereof
13.
Method for producing a superconducting wire, in particular using lead-free solder
d) facing each other are soldered and/or welded. A method for producing a superconducting wire is thereby provided, which restricts the cross section of the superconducting wire to a lesser extent and which permits the use of lead-free solder.
p0.2>300 MPa and a cross-sectional reduction A>20%, wherein the metallic material is selected to be chemically inert to diffusing tin (Sn) up to a reaction temperature T of the solid diffusion reaction.
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