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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

Pub. No.:    WO/2018/198515    International Application No.:    PCT/JP2018/006899
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Tue Feb 27 00:59:59 CET 2018
IPC: H01B 13/00
C22C 9/00
C22C 9/01
C22C 9/04
C22C 13/00
C22C 27/02
C22F 1/00
C22F 1/08
C22F 1/16
H01B 12/10
Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
国立研究開発法人物質・材料研究機構
Inventors: BANNO Nobuya
伴野 信哉
TACHIKAWA Kyoji
太刀川 恭治
Title: PRODUCTION METHOD FOR NB3SN SUPERCONDUCTING WIRE ROD, PRECURSOR FOR NB3SN SUPERCONDUCTING WIRE ROD, AND NB3SN SUPERCONDUCTING WIRE ROD USING SAME
Abstract:
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.