PRECURSOR FOR MANUFACTURING NB3SN SUPERCONDUCTING WIRE MATERIAL AND NB3SN SUPERCONDUCTING WIRE MATERIAL

摘要

The strength of a superconducting wire material is increased to over that of conventional superconducting wire materials. A precursor (1) (precursor for manufacturing an Nb3Sn superconducting wire material) is provided with: a superconducting matrix section (2) in which a plurality of Nb-based filaments (5) containing pure Nb or an Nb-based alloy are arranged in a bronze matrix section (4) (Cu-Sn-based alloy); a diffusion barrier layer (6) arranged on the outer periphery of the superconducting matrix section (2); a stabilization copper layer (7) arranged on the outer periphery of the diffusion barrier layer (6); and a reinforcing member (8), which is arranged in the superconducting matrix section (2) and which contains pure Ta or a Ta-based alloy. The reinforcing member (8) occupies an area ratio of 15-25% of the cross-section perpendicular to the axis of the precursor (1).