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Monofilament for the production of an Nb3Sn superconductor wire

a superconductor wire and monofilament technology, applied in the direction of superconducting magnets/coils, superconductor devices, magnetic bodies, etc., can solve the problems of difficult production and processing of nbsub>3/sub>sn superconducting wires, and achieve high superconducting current carrying capacity and high compaction of powder cores

Inactive Publication Date: 2014-09-25
BRUKER EAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method of producing a high-quality superconducting wire by using a niobium-containing material for the inner tube. After annealing, the wire has a finer and more uniform structure of niobium grains and is resistant to cavities. The use of a Nb-alloy inner tube also prevents impurities from entering the cladding tubes and allows for effective current protection. The method allows for easy control of the reaction advance and ensures the wire is protected from burning through during quenching. The use of a scanning electron microscope makes it easy to identify the reaction front.

Problems solved by technology

However, the production and processing of Nb3Sn superconducting wires is difficult, since Nb3Sn is a relatively brittle material and can therefore not be plastically deformed (or only to a minimum extent).

Method used

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  • Monofilament for the production of an Nb3Sn superconductor wire
  • Monofilament for the production of an Nb3Sn superconductor wire
  • Monofilament for the production of an Nb3Sn superconductor wire

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first embodiment

[0057]FIG. 1 schematically shows an inventive monofilament 1 in cross-section perpendicular to its longitudinal direction.

[0058]The monofilament 1 has an inner tube 2 which consists of niobium in the illustrated embodiment. A powder core 3 of a mixture of, in the present case, NbSn2 powder, Sn powder and Cu powder is disposed in the inner tube 2. The content of Cu in the mixture is approximately 5 weight % and the content of Sn in the mixture is typically at least 50 weight %.

[0059]The inner tube 2 is arranged in an outer tube 4 which consists of NbTa7.5 in the present case. The outer side of the inner tube 2 thereby directly abuts the inner wall of the outer tube 4. The inner tube 2 and the outer tube 4 each have (circular) round inner and outer cross-sections.

[0060]The outer tube 4 is, in turn, arranged in a cladding tube 5 which consists of elementary copper in the present case. The cladding tube 5 has a round inner cross-section in the illustrated embodiment such that the outer ...

second embodiment

[0062]FIG. 2 schematically shows an inventive monofilament 1 in cross-section perpendicular to its longitudinal extension.

[0063]The second embodiment of the monofilament 1 largely resembles the embodiment of FIG. 1, in particular, with respect to the inner tube 2, the powder core 3 and the outer tube 4.

[0064]However, the cladding tube 5 here is provided with a (circular) round outer cross-section. For this reason, the monofilament 1 is easy to manufacture. The cladding tube 5 is also produced of elementary copper and has a (circular) round inner cross-section.

[0065]FIG. 3 shows a cross-section perpendicular to its longitudinal extension of an embodiment of an inventive precursor 10 of a superconducting wire.

[0066]A plurality of drawn monofilaments 11 (in the present case seven as an example), which are each produced from one monofilament by means of a filament drawing process, are bundled in a wire cladding tube 12 (“casing tube”) in the precursor 10, and are subsequently subjected ...

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Abstract

A monofilament (1) for the production of a superconducting wire (20) has 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.

Description

[0001]This application claims Paris convention priority from EP 13 159 230.5 filed on Mar. 14, 2013, the entire disclosure of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]The invention concerns a monofilament for the production of a superconducting wire, comprising[0003]a powder core that contains at least Sn and Cu,[0004]an inner tube that encloses the powder core,[0005]an outer tube in which the inner tube is arranged, wherein the outer side of the inner tube is in contact with the inner side of the outer tube, and wherein the outer tube is made from Nb or an alloy containing Nb, and[0006]a cladding tube in which the outer tube is arranged.[0007]A monofilament of this type is disclosed by EP 0 169 596 A1.[0008]Nb3Sn is a widely used superconducting material, in particular, for the production of superconducting magnet coils. In comparison with other metallic low-temperature superconducting materials (such as NbTi), Nb3Sn superconducting wires achieve t...

Claims

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Application Information

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IPC IPC(8): H01L39/24
CPCH01L39/2409H01L39/2403Y10T29/49014Y10T428/12076C22C13/00C22C30/02B22F1/09H10N60/0184H10N60/85H10N60/0128B22F3/20B22F5/12B22F7/04B22F2301/20B22F2301/30B22F2303/01B22F2998/10H01F6/06H01F41/048
Inventor THOENER, MANFRED
Owner BRUKER EAS