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US 11,491,543 B2Granted
Method for producing an Nb3Sn superconductor wire
AssigneeBruker EAS GmbH
InventorManfred Thoener
Life of this patent
Estimating the term…
Abstract
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.
Claims13
A method for producing a superconducting wire having Nb3SN superconductor from a monofilament and a precursor, the monofilament comprising:
- a powder core that contains at least Sn and Cu;
- an inner tube that encloses the powder core, the inner tube being made of Nb or of an alloy containing Nb;
- an outer tube in which the inner tube is disposed, wherein an outer side of the inner tube is in contact with an inner side of the outer tube, the outer tube being made of Nb or of an alloy containing Nb;
- and
- a cladding tube in which the outer tube is disposed, the inner tube having a round inner cross-section and a round outer cross-section and the outer tube having a round inner cross-section and a round outer-cross-section, wherein 4≤Woutertube/Winnertube≤50 with Woutertube:
- wall thickness of the outer tube and Winnertube:
- wall thickness of the inner tube,
- wherein the monofilament is produced by a method comprising the steps of:
- a) filling the powder core into the inner tube;
- b) drawing, following step a), the inner tube, thereby compacting the powder core;
- c) inserting the outer tube into the cladding tube, and
- d) inserting, following step b), the drawn, filled inner tube into the outer tube, wherein step c) is performed prior to or after step d),
- the precursor being made by a method comprising the steps of:
- e) drawing one or more of the monofilaments produced in step d) to produce monofilaments having a hexagonal outer cross-section;
- f) bundling a plurality of drawn monofilaments in a wire cladding tube;
- and
- g) extruding and/or drawing the wire cladding tube containing the bundled and drawn monofilaments, thereby obtaining the precursor of the superconducting wire,
- and the superconducting wire is made from the precursor using the following steps:
- h) mechanically deforming the precursor made in step g) or winding the precursor made in step g) to form a coil, and i) temperature-treating the deformed precursor or temperature-treating the deformed precursor at a maximum temperature of 700° C. or less, wherein Nb from the inner tube and the outer tube reacts with Sn from the powder core to form Nb3SN.
16 more elements
A method for producing a superconducting wire having Nb3SN superconductor from a monofilament and a precursor, the monofilament comprising:
- a powder core that contains at least Sn and Cu;
- an inner tube that encloses the powder core, the inner tube being made of Nb or of an alloy containing Nb;
- an outer tube in which the inner tube is disposed, wherein an outer side of the inner tube is in contact with an inner side of the outer tube, the outer tube being made of Nb or of an alloy containing Nb;
- and
- a cladding tube in which the outer tube is disposed, the inner tube having around inner cross-section and a round outer cross-section and the outer tube having a round inner cross-section and a round outer-cross-section, wherein 4≤Woutertube/Winnertube≤50 with Woutertube:
- wall thickness of the outer tube and Winnertube:
- wall thickness of the inner tube,
- wherein the monofilament is produced by a method comprising the steps of:
- a) filling the powder core into the inner tube;
- b) drawing, following step a), the inner tube, thereby compacting the powder core;
- c) inserting the outer tube into the cladding tube, and d) inserting, following step b), the drawn, filled inner tube into the outer tube, wherein step c) is performed prior to or after step d),
- the precursor being made by a method comprising the steps of:
- e) drawing one or more of the monofilaments produced in step d) to produce monofilaments having a hexagonal outer cross-section;
- f) bundling a plurality of drawn monofilaments in a wire cladding tube;
- and
- g) extruding and/or drawing the wire cladding tube containing the bundled and drawn monofilaments, thereby obtaining the precursor of the superconducting wire,
- and the superconducting wire is made from the precursor using the following steps:
- h) mechanically deforming the precursor made in step g) or winding the precursor made in step g) to form a coil, and
- i) temperature-treating the deformed precursor or temperature-treating the deformed precursor at a maximum temperature of 700° C. or less, wherein Nb from the inner tube and the outer tube reacts with Sn from the powder core to form Nb3Sn, wherein Nb from the inner tube and the outer tube reacts with Sn from the powder core to form Nb3Sn via a reaction front which advances substantially through an entire radial extent of the outer tube.
16 more elements
Dependencies are inferred from the claim text.