Patent ID: 7566414
Filing Date: 2009-07-28
Classification: H01L

Abstract:
1. A method for manufacturing a powder-metallurgy processed Nb 3 Sn superconducting wire, the method comprising the steps of: filling a sheath made of Nb or a Nb alloy with a raw material powder containing Sn; reducing a diameter of the sheath filled with the raw material powder to form a wire; and heat-treating the wire to form a superconducting phase at an internal surface of the sheath, wherein the raw material powder contains a Cu—Sn alloy powder or a Cu—Sn intermetallic compound powder and a Sn powder, and is compacted under isotropic pressure before the step of filling the sheath, and wherein the Sn content in the Cu—Sn alloy powder or the Cu—Sn intermetallic compound powder is in a range of about 20 to 80 mass %, and the Sn powder is contained in the raw material powder at a mass ratio of about 0.2 to 2.0 relative to the Cu—Sn alloy powder or the Cu—Sn intermetallic compound powder.