Sumitomo Electric Industries, Limited

Shin-ichi Kobayashi

Takeshi Kato

Naoki Ayai

Munetsugu Ueyama

Akira Mikumo

Tetsuyuki Kaneko

The inventive method of manufacturing an oxide superconducting wire comprises a step (S, S) of preparing a wire formed by covering raw material powder of an oxide superconductor with a metal and a step (S, S) of heat-treating the wire in a pressurized atmosphere, and the total pressure of the pressurized atmosphere is at least 1 MPa and less than 50 MPa. Thus, formation of voids between oxide superconducting crystals and blisters of the oxide superconducting wire is suppressed while the partial oxygen pressure can be readily controlled in the heat treatment, whereby the critical current density can be improved.

Method of manufacturing oxide superconducting wire

A method of manufacturing an oxide superconducting wire, through which dimensional precision of width or thickness of the wire can be improved and an oxide superconducting wire with high superconducting performance can be obtained, is provided. The method of manufacturing the oxide superconducting wire includes preparing a composite by covering with metal powder containing an oxide superconductor or raw material for an oxide superconductor, and rolling the composite using a lubricant having kinematic viscosity of 20&times;10 mm /s or smaller.

Method for producing oxide superconducting wire

Powder including at least a superconducting phase is degassed (step S ). After the powder is filled in a silver pipe (step S ), the silver pipe is degassed at a high temperature (step S ). After a plurality of single-core wires are inserted into another silver pipe to attain a multi-core structure, the silver pipe is degassed at a high temperature (step S ). The silver pipe is sealed under a reduced pressure (step S ). Therefore, even when a multi-core superconducting wire is manufactured, a manufacturing method of a superconducting wire capable of preventing swelling of the wire caused by a residual gaseous component can be obtained.

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Osaka, Japan

Shin-ichi Kobayashi