Method of manufacturing oxide superconducting wire

A method of manufacturing a high T.sub.c copper oxide superconducting wire, comprising:

• a step of preparing powder by repeating heat treatment and pulverization of a high T.sub.c copper oxide superconductor a plurality of times;
• a step of covering said powder with a sheath of a metal or a metal alloy being unreactive with respect to said powder at a temperature of not more than 950.degree. C.;
• a step of deforming said sheath;
• a step of heat treating a wire obtained by said step of deforming said sheath, and
• said method further including a process of desorbing gas from said powder by heating said powder under a decompressed atmosphere at a temperature of not more than 850.degree. C. so that no inflation of said wire is caused by gas in said step of heat treating said wire.

A method of manufacturing a high T.sub.c copper oxide superconducting wire, comprising:

• a step of preparing powder by repeating heat treatment and pulverization of raw material for a high T.sub.c copper oxide superconductor a plurality of times;
• a step of covering said powder with a sheath of a metal or a metal alloy being unreactive with respect to said powder at a temperature of not more than 950.degree. C.;
• a step of deforming said sheath;
• a step of heat treating a wire obtained by said step of deforming said sheath, and
• said method further including a step of desorbing gas from said powder between said step of preparing powder and said step of covering said powder with a sheath so that no inflation of said wire is caused by gas in said step of heat treating said wire.

A method of manufacturing a high T.sub.c copper oxide superconducting wire, comprising:

• a step of preparing powder by repeating heat treatment and pulverization of a high T.sub.c copper oxide superconductor a plurality of times;
• a step of covering said powder with a sheath of a metal or a metal alloy being unreactive with respect to said powder at a temperature of not more than 950.degree. c.;
• a step of deforming said sheath;
• a step of heat treating a wire obtained by said step of deforming said sheath, and
• said method further including a process of desorbing gas from said powder by heating said powder under a decompressed atmosphere at a temperature of not more than 850.degree. c. so that no gas is adsorbed by said powder upon said step of heat treating said wire and so that no inflation of said wire is caused by gas in said step of heat treting said wire.