Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-02-04
1992-08-18
Theisen, Mary Lynn
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
423263, 423593, 423604, 505779, 505780, 505725, C01F 1700, C01G 302
Patent
active
051400057
ABSTRACT:
A superconductive oxide powder is produced by a method comprising spray drying a slip to form agglomerates, feeding the agglomerates sequentially through a first and a second oxygen supported combustion flame for fusing the fine particles in the agglomerates to form an intermediate powder, annealing the intermediate powder in an oxygen-containing environment such as to produce a friable mass, and crushing the mass to form the superconductive oxide powder. For example, a precursor compound in the slip is barrium carbonate, the other precursor constituents are yttrium oxide and copper oxide, and the yttrium, barium and copper in atomic proportions in the precursor constituents are 1:2:3+Y where Y denotes a copper surplus having a value of up to about 1.5. In the final powder the proportions are 1:2:3+Z where Z is between about 0.2 and 1.0.
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Kushner Burton A.
Rangaswamy Subramaniam
Rotolico Anthony J.
Grimes E. T.
Ingham H. S.
The Perkin-Elmer Corporation
Theisen Mary Lynn
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