| 摘要 |
PROBLEM TO BE SOLVED: To provide a bronze method Nb<SB>3</SB>Sn superconductive wire rod to effectively improve durability against bending deformation, and not to deteriorate superconductive characteristics such as critical current density and n value. SOLUTION: In the superconductive wire rod manufactured by applying Nb<SB>3</SB>Sn producing heat treatment on a precursor which is equipped with a superconductive matrix part where a plurality numbers of Nb or Nb based alloy filaments are arranged in a Cu-Sn based alloy, and in which a diffusion barrier layer and stabilized copper are arranged at its outer periphery, as for the Nb or Nb based alloy filament, after the Nb<SB>3</SB>Sn producing heat treatment, an average ratio of an area of the Nb or Nb based alloy regions where diffusion reaction does not occur to the filament all cross-section is 2 to 10%. COPYRIGHT: (C)2010,JPO&INPIT
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