Internal diffusion process Nb3Sn superconducting wire

摘要

An internal diffusion process Nb3Sn superconducting wire is produced by drawing a composite wire including a composite material containing a plurality of Nb or Nb based alloy cores embedded in a Cu or Cu based alloy matrix and a Sn or Sn based alloy core disposed in the center portion, a diffusion barrier layer composed of Nb or Ta and disposed on the outer perimeter of the composite material, and stabilizing Cu disposed on the outside of the diffusion barrier layer and heat-treating the resulting composite wire so as to diffuse Sn and react Sn with the Nb or Nb based alloy cores, wherein the area percentage of the stabilizing Cu in a cross section in a direction perpendicular to the axis center of the composite wire is 10% to 35% and the area percentage of the diffusion barrier layer is 10% to 25%.