Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Process of making wire – tape – cable – coil – or fiber
Patent
1995-02-08
1997-03-11
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Process of making wire, tape, cable, coil, or fiber
505492, 505501, 505782, 505928, 29599, H01L 3924
Patent
active
056101236
ABSTRACT:
In a method of preparing a bismuth oxide superconducting wire comprising the steps of filling raw material powder into a metal sheath, working the same into a wire by performing deformation processing in this state, and heat treating the wire, the raw material powder is heat treated before the step of working the raw material powder into a wire by performing deformation processing, so that the ratio of a 2212 phase, containing Bi or (Bi,Pb), Sr, Ca and Cu in composition ratios of about 2:2:1:2, to a 2223 phase, containing Bi or (Bi,Pb), Sr, Ca and Cu in composition ratios of about 2:2:2:3, is 75 to 90:10 to 25, in order to prepare a wire which is excellent in critical current density as well as in critical current.
REFERENCES:
patent: 5004722 (1991-04-01), Tallman
patent: 5057486 (1991-10-01), Arendt et al.
D. Shi et al., "Lattice deflects and flux pinning in crystallized metal-oxide glasses in the Bi-Sr-Ca-Cu-O system", Applied Physics Letters, vol. 55, No. 13, 25 Sep. 1989, New York US pp. 1354-1356.
H. Sekine et al., "Fabrication of Bi-(Pb)-Sr-Ca-Cu-O mono-and multifilamentary superconductors and improvement in critical current density", Journal Of Applied Physics, vol. 66, No. 6, 15 Sep. 1989, New York, pp. 2762-2764.
T. Hikata et al., "Electromagnetic properties and morphology of Ag-sheathed Bi-Pb-Sr-Ca-Cu-O superconducting wires", Japanese Journal Of Applied Physics Letters, vol. 28, No. 7, Jul. 1989, Tokyo JP, pp. 1204-1206.
"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
Ueyama Munetsugu
Gorski Joseph M.
Sumitomo Electric Industries Ltd.
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