Method of producing oxide superconducting wire material, method of modifying oxide superconducting wire material,and oxide superconducting wire material

A method of manufacturing an oxide superconducting wire, comprising:

• a step of preparing a wire formed by covering raw material powder of an oxide superconductor with a metal including silver;
• and
• a heat treatment step of heat-treating said wire in a pressurized atmosphere having a total pressure of at least 1 MPa and less than 50 MPa in the heat treatment, wherein pressurization is started after the temperature of said atmosphere exceeds 400° C. at a heat-up time before the heat treatment in said heat treatment step.

A method of modifying an oxide superconducting wire, comprising a heat treatment step of heat-treating an oxide superconducting wire formed by covering an oxide superconductor with a metal in a pressurized atmosphere having a total pressure of at least 1 MPa and less than 50 MPa in the heat treatment, wherein

• pressurization is started from a temperature reducing 0.2% yield strength of said metal below said total pressure in said heat treatment at a heat-up time before the heat treatment in said heat treatment step.

A method of modifying an oxide superconducting wire, comprising a heat treatment step of heat-treating a wire formed by covering an oxide superconducting wire with a metal including silver in a pressurized atmosphere having a total pressure of at least 1 MPa and less than 50 MPa in the heat treatment, wherein

• pressurization is started after the temperature of said atmosphere exceeds 400° C. at a heat-up time before the heat treatment in said heat treatment step.