Precursor for manufacturing Nb3Sn superconducting wire and Nb3Sn superconducting wire

Abstract

A precursor for manufacturing a Nb3Sn superconducting wire according to the present invention includes a mono-element wire including a Sn or Sn-based alloy core disposed at the, a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the Cu or Cu-based alloy matrix. In a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 μm to 30 μm, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 μm or less.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view schematically illustrating an example of the structure of a precursor for manufacturing a superconducting wire (mono-element wire) by the internal diffusion process;

FIG. 2 is a sectional view schematically illustrating another example of the structure a precursor for manufacturing a superconducting wire (mono-element wire) by the internal diffusion process;

FIG. 3 is a sectional view schematically illustrating an example of the structure of a precursor for manufacturing a superconducting wire (multi-element wire) by the internal diffusion process;

FIG. 4 is a sectional view schematically illustrating another example of the structure of a precursor for manufacturing a superconducting wire (multi-element wire) by the internal diffusion process; and

FIG. 5 is a sectional view schematically illustrating an example of the structure of a precursor for manufacturing a superconducting wire (mono-element wire) according to the present invention.

Claims

1. A precursor for manufacturing a Nb3Sn superconducting wire by an internal Sn process, the precursor comprising: a mono-element wire including a Sn or Sn-based alloy core disposed at the center, a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the Cu or Cu-based alloy matrix;wherein in a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 μm to 30 μm, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 μm or less.

2. A precursor for manufacturing a Nb3Sn superconducting wire by an internal Sn process, the precursor comprising: a multi-element wire including a plurality of mono-element wires each including a Sn or Sn-based alloy core disposed at the center, and a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the plurality of mono-element wires;wherein in a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 μm to 30 μm, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 μm or less.

3. A precursor for manufacturing a Nb3Sn superconducting wire by an internal Sn process, the precursor comprising: a multi-element wire including a plurality of mono-element wires each including a Sn or Sn-based alloy core disposed at the center, a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the Cu or Cu-based alloy matrix; and a stabilizing copper layer surrounding the plurality of mono-element wires;wherein in a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 μm to 30 μm, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 μm or less.

4. The precursor according to claim 1, wherein the plurality of Nb or Nb-based alloy filaments is disposed in the Cu or Cu-based alloy matrix so as not to contact each other, and the distance between the respective Nb or Nb-based alloy filaments is 0.05 to 0.30 times as large as the average diameter of the filaments.

5. The precursor according to claim 2, wherein the plurality of Nb or Nb-based alloy filaments is disposed in the Cu or Cu-based alloy matrix so as not to contact each other, and the distance between the respective Nb or Nb-based alloy filaments is 0.05 to 0.30 times as large as the average diameter of the filaments.

6. The precursor according to claim 3, wherein the plurality of Nb or Nb-based alloy filaments is disposed in the Cu or Cu-based alloy matrix so as not to contact each other, and the distance between the respective Nb or Nb-based alloy filaments is 0.05 to 0.30 times as large as the average diameter of the filaments.

7. A Nb3Sn superconducting wire wherein the precursor according to claim 1 is heat-treated to form a Nb3Sn superconducting phase.

8. A Nb3Sn superconducting wire wherein the precursor according to claim 2 is heat-treated to form a Nb3Sn superconducting phase.

9. A Nb3Sn superconducting wire wherein the precursor according to claim 3 is heat-treated to form a Nb3Sn superconducting phase.