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|1. (WO2018198515) PRODUCTION METHOD FOR NB3SN SUPERCONDUCTING WIRE ROD, PRECURSOR FOR NB3SN SUPERCONDUCTING WIRE ROD, AND NB3SN SUPERCONDUCTING WIRE ROD USING SAME|
|Applicants:||NATIONAL INSTITUTE FOR MATERIALS SCIENCE
|Title:||PRODUCTION METHOD FOR NB3SN SUPERCONDUCTING WIRE ROD, PRECURSOR FOR NB3SN SUPERCONDUCTING WIRE ROD, AND NB3SN SUPERCONDUCTING WIRE ROD USING SAME|
The present invention provides: a Nb3Sn superconducting wire rod that is produced by the internal tin process and that has a number of useful functions in such aspects as promotion of Nb3Sn layer generation, mechanical strength (and increase in interfacial resistance) of superconducting filaments, critical temperature (magnetic field), miniaturization of crystal grains, etc.; and a production method therefor. The Nb3Sn superconducting wire rod production method according to one embodiment of the present invention comprises: a step for providing a rod material 10 which has an alloy composition represented by Cu-xZn-yM (where, x is 0.1-40 mass%; M=Ge, Ga, Mg or Al, provided that x is 0-40 mass% for Mg), and a central part of which is provided with a Sn insertion hole 12, and which has a plurality of Nb insertion holes 14 that are discretely disposed along the outer peripheral surface of the Sn insertion hole 12; a step for installing an alloy bar having an alloy composition of Sn-zQ (Q=Ti, Zr, Hf) in the Sn insertion hole 12, and inserting a Nb core in the Nb insertion holes 14; a step for reducing the diameter of the rod material 10 so as to prepare a Cu-xZn-yM/Nb/Sn-zQ composite multicore wire having a prescribed outer diameter; and a step for subjecting the composite multicore wire to a heat treatment for generating a Nb3Sn phase.