Method for producing a superconducting wire material lengthened

Abstract

There is provided a technique for producing a superconducting wire material in which the yield in a process of joining superconducting wire materials is improved over the related art. A method for producing a superconducting wire material lengthened by joining end portions of superconducting wire materials each having an oxide superconducting film, the end portions serving as joining surfaces, includes a step of disposing a micro-crystal of an oxide superconducting material on each of the joining surfaces of the oxide superconducting films, a pasting step of overlapping and pasting together the joining surfaces on which the micro-crystal is disposed, and a heat joining step of heating the overlapped joining surfaces to grow the micro-crystal, thereby forming, as a joining layer, a superconducting layer of the oxide superconducting material to join the joining surfaces to each other. A superconducting joining member for lengthening a superconducting wire material by performing heating while the superconducting joining member is pasted so as to bridge oxide superconducting thin films of two superconducting wire materials to join the two superconducting wire materials, wherein a micro-crystal of an oxide superconducting material is disposed on a joining surface.