Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1987-09-28
1990-11-27
Theisen, Mary Lynn Fertig
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
156603, 264 56, 264 86, 264108, 264140, 505740, 505741, H01L 3912, B29C 3914, B29C 4700, C04B 3500
Patent
active
049735756
ABSTRACT:
A superconductor comprised of a polycrystalline metal oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-X (where 0<.times.<0.5) is capable of accommodating very large current densities. By aligning the two-dimensional Cu--O layers which carry the current in the superconducting state in the a- and b-directions, i.e., within the basal plane, a high degree of crystalline axes alignment is provided between adjacent grains permitting the metal oxide material to accommodate high current densities. The orthorhombic crystalline particles have a tendency to lie down on one of the longer sides, i.e., on the a- or b-direction. Aligning the crystals in this orientation is accomplished by mechanical working of the material such as by extrusion, tape casting or slip casting, provided a single crystal powder is used as a starting material, to provide a highly oriented, e.g., approximately 90% of the crystal particles have a common orientation, superconducting matrix capable of supporting large current densities.
REFERENCES:
patent: 1918848 (1933-07-01), Land et al.
patent: 3148232 (1964-09-01), Scheyer
patent: 4238214 (1980-12-01), Ashbee
Johnson et al. "Fabrication of Ceramic Articles from High T.sub.c Superconducting Oxides" Proc. 1987 Spring Meeting MRS, High Temperature Superconductors, Apr. 23-24, 1987, pp. 193-195.
Poeppel et al., "Fabrication of YBa.sub.2 Cu.sub.3 O.sub.7 Superconducting Ceramics" ACS Symposium Series 351, pp. 261-265, Aug. 30-Sep. 4, 1987.
ARCH Development Corporation
Fertig Theisen Mary Lynn
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