Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-12-22
1991-07-23
Stoll, Robert L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
419 21, 419 33, 419 36, 419 38, 419 39, 419 42, 419 49, 419 54, H01B 1200
Patent
active
050343734
ABSTRACT:
The invention provides a process for production of silver-containing precursor alloys to oxide superconductors, said alloys having reduced amounts of intermetallics. Powders containing metallic elemental components of an oxide superconductor are high energy milled for a predetermined amount of time to increase homogeneity of the mixed metallic elemental components of the oxide superconductor. Silver is then high energy milled into the metallic components. The mixed silver and metallic elemental components of the oxide superconductor are compacted for the silver-containing superconductor precursor. The compacted powder is preferably hot worked at a temperature of at least 50% of the precursor alloy's melting temperature in degrees Kelvin.
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Matsuzaki et al., "Preparation of a High T.sub.c Superconductor by Oxidation of an Amorphous La.sub.1.8 Sr.sub.0.2 Cu Alloy Ribbon in Air", Japanese Journal of Applied Physics, vol. 26, No. 4, Apr. 1987, pp. L334-L337.
Yurek et al., "Superconducting Microcomposites by Oxidation of Metallic Precursors", Journal of Metals, Jan. 1988, pp. 16-18.
Masur Lawrence J.
McKimpson Marvin G.
Poole Jon M.
Sandhage Kenneth H.
Smith Gaylord D.
American Superconductor Corporation
Bhat Nina
Biederman Blake T.
INCO Alloys International, Inc.
Mulligan, Jr. Francis J.
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