Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – With melting
Patent
1992-09-01
1994-04-26
Lieberman, Paul
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
With melting
264 60, 264 66, 505725, 505733, 505742, 505785, 505490, 505492, C01F 1102, C01G 302, H01B 108, H01L 3924
Patent
active
053067002
ABSTRACT:
A method is disclosed for fabricating bulk superconducting materials into shaped articles, including ones of relatively large sizes and complex shapes, which have high densities, high integrity, high magnetization and critical current densities. A mixture of superconducting material is completely or substantially melted and the molten material is then cooled to room temperature and ground to a powder. The ground powder is next mixed with a second phase made up of either precursor superconducting powder or a mixture of metallic silver and copper. The resulting mixture is then shaped into an article by conventional ceramic article forming techniques: pressing, extruding, molding or the like. The resulting shaped article is heated to a temperature at which a substantial amount of its content of second phase material is melted, thus facilitating densification of the entire shaped article. The resulting dense specimen is annealed in an appropriate environment while it is being cooled to room temperature.
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Boyd John
Lieberman Paul
The Catholic University of America
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