Precursor for fabricating nb*sn superconducting wire, and nb*sn superconducting wire, and method for fabricating the same

A technology of superconducting wires and precursors, which is applied in the manufacture/processing of superconductor devices, superconducting/high-conducting conductors, superconducting devices, etc. It can solve the problems of unsatisfactory high magnetic field properties, decreased crystallinity, and small thickness of Sn layer, etc. problem, to achieve the effect of preventing interruption and Sn leakage, uniform processing, and good superconducting performance

Inactive Publication Date: 2006-09-13
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, due to the limited solid solution concentration of Sn in bronze (15.8% by mass or less), the resulting Nb 3 The thickness of the Sn layer is small, the crystallinity decreases, and the high magnetic field properties are also unsatisfactory

Method used

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  • Precursor for fabricating nb*sn superconducting wire, and nb*sn superconducting wire, and method for fabricating the same
  • Precursor for fabricating nb*sn superconducting wire, and nb*sn superconducting wire, and method for fabricating the same
  • Precursor for fabricating nb*sn superconducting wire, and nb*sn superconducting wire, and method for fabricating the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Ta powder and Sn powder having a size of 350 mesh (grain size of 40 μm or less) were mixed so as to satisfy an atomic ratio of Ta:Sn=6:5, and 2% by mass of Cu powder was added, followed by further mixing. The resulting mixture was placed in an aluminum pot, and heat-treated at 950° C. for 10 hours under a vacuum of 0.01 Pa. The heat-treated mixture was pulverized, placed again in an aluminum pot, heat-treated at 950° C. for 10 hours under a vacuum of 0.01 Pa, and then formed into Ta-Sn-Cu alloy powder having a particle size of 100 μm or less by crushing.

[0031] The obtained alloy powder was charged into a tube having an outer diameter of 17 mm and an inner diameter of 11 mm made of a Ta alloy of 7.5% by mass Nb having different contents of oxygen, nitrogen and carbon gas components or different crystal size. For all the samples, the hydrogen concentration was also measured, and the result was 5 ppm or less, which has no influence on the result. Those with a small av...

Embodiment 2

[0044] In each tube having an outer diameter of 55 mm and an inner diameter of 30 mm made of a Ta alloy of 7.5% by mass Nb, wherein the alloy has different concentrations of oxygen, nitrogen and carbon gas components and a different average grain size, A Cu tube with an outer diameter of 30 mm and an inner diameter of 26 mm was inserted, and a Sn rod with an outer diameter of 26 mm was further inserted. The Nb—Ta alloy tube was covered with a Cu tube having an outer diameter of 67 mm to form an extruded billet, which was extruded at room temperature to obtain an outer diameter of 28 mm. Subsequently, the outer diameter was reduced to 0.3 mm by wire drawing using a die.

[0045] Each filament was heat-treated at 700°C for 80 hours under vacuum. For the obtained wire, wire drawing results and critical current (Ic) in high magnetic field (external magnetic field: 21T), liquid helium (temperature: 4.2K) were measured. The Ic value was divided by the area of ​​the non-copper port...

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Abstract

A method for fabricating a Nb3Sn superconducting wire includes the steps of loading or inserting a core material containing at least Sn into a pipe member made of Nb or a Nb alloy, inserting the pipe member into a Cu billet to form a composite member, subjecting the composite member to diameter reduction, and then heat-treating the composite member to form a Nb3Sn superconducting layer from the inner surface of the pipe member, wherein, in the pipe member made of Nb or the Nb alloy after the diameter reduction, the average crystal grain size is 0.1 to 2 m, and preferably, the total concentration of oxygen, nitrogen, and carbon is 120 ppm or less.

Description

technical field [0001] The present invention relates to Nb 3 Sn superconducting wires and methods for producing such superconducting wires by tube process or powder process. Specifically, the present invention relates to Nb that can be used as a superconducting magnet material to generate a magnetic field 3 Sn superconducting wire and preparation of the Nb 3 A method of Sn superconducting wires, said superconducting magnets are used in nuclear fusion equipment, accelerators, energy storage equipment, physical property research and the like. Background technique [0002] In the field of practical use of superconducting wires, as for superconducting magnets used in high-resolution nuclear magnetic resonance (NMR) analyzers, superconducting magnets have recently tended to generate higher magnetic field. [0003] As superconducting wires for superconducting magnets that generate high magnetic fields, Nb 3 Sn line has been put into practical use. in Nb 3 In the preparation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/00H01L39/24C22C27/02C22C13/00
CPCH01L39/2409Y10T428/12708H10N60/0184H01B12/02H01B13/0016
Inventor 宫武孝之宫崎隆好加藤弘之财津享司
Owner KOBE STEEL LTD
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