Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-10-13
1994-02-22
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
29599, 505928, 505930, H01L 3924
Patent
active
052886999
ABSTRACT:
In a method of manufacturing an oxide superconducting wire including steps of performing heat treatment and deformation processing in a state of filling up a metal sheath with powder of an oxide superconductor or raw material therefor, fine particles or gas adsorbed by the powder can be desorbed by heating the powder at least once preferably under decompression in a stage before final sintering of the powder. It is possible to further withdraw the adsorbed fine particles or gas by heating the powder under decompression at least once before the same is covered with the sheath, covering the powder with the sheath, deforming the sheath and again heating the same under decompression, for example. Thus, it is possible to prevent gas generation from the powder during heat treatment for further growing superconductive particles, thereby preventing the superconducting wire from inflation etc. caused by such gas generation.
REFERENCES:
patent: 4952554 (1990-08-01), Jin et al.
Yoshio Sakka et al., "Gas Adsorption and Desorption Properties of Oxide Superconducting Powder", presented at the spring meeting of Powder Metallurgy Association in Tokyo, May 31, 1981.
Hikata, T., et al., "Ag-sheathed Bi-Pb-Sr-Ca-Cu-O Superconducting wires", Japanese Journal of Applied Physics, vol. 28, No. 1, Jan. 1989, pp. L82-L84.
"Critical Current Density in Superconducting Bi-Pb-Sr-Ca-Cu-O Wires and Coils", Dou et al., Nov. 16, 1989.
Hikata Takeshi
Sato Ken'ichi
Gorski Joseph M.
Sumitomo Electric Industries Inc.
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