Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – With melting
Patent
1995-06-23
2000-10-24
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
With melting
505451, 505500, 29599, H01L 3924
Patent
active
061367567
ABSTRACT:
The high temperature superconducting material is made from a base material having two opposing surfaces and including a high purity yttrium barium copper oxide compound having a YBa.sub.2 Cu.sub.3 O.sub.7-x (123) composition with silver oxide. The method of making the superconducting material includes controlling a temperature of each opposing surface of the base material to form a time-dependent spatial temperature gradient across the base material; measuring the time-dependent spatial temperature gradient, determining whether it is within a desired range and controlling it so that the time-dependent spatial temperature gradient remains within the desired range, thereby melt-texturing the base material while decomposing the silver oxide into silver and transforming the base material into quasi-crystalline superconducting regions having YBa.sub.2 Cu.sub.3 O.sub.7-x (123) composition, intrinsically non-superconducting material zones consisting of coherent yttrium-rich material having a Y.sub.2 BaCuO.sub.5 (211) composition, and copper-enriched interfacial layers between the quasi-crystalline superconducting regions and the non-superconducting material zones, thereby providing a superconductive material, and then cooling the superconductive material, thereby providing a superconducting material having silver inclusions, the superconducting material having the quasi-crystalline superconducting regions separated from the non-superconducting material zones by the copper-enriched interfacial layers, wherein the copper-enriched interfacial layers function as Pinning centers. A new magnetic bearing based on the superconducting material is also described.
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patent: 5262391 (1993-11-01), Morita et al.
"YBaCuO Large Scale Melt Texturing in a Temperature Gradient", Werfel, et al, Jul. 3, 1997.
"Melt Processing of Bulk Tc Superconductors . . . ", Murakami, et al, Sep. 24, 1990.
"Melt Processing of YBaCuO Superconductors and Critical Currents", Murakami, et al., Dec. 4, 1989.
"Modified Melt Texturing Process for YBCO based on the Polymeric Section . . . ", Krabbes, et al, Dec. 22, 1994 EUCAS, p. 333-336, Oct. 1993, Goethingem, Germany.
Langbein Gerhard
Werfel Frank
Adelwitz Technologiezentrum GmbH
Gorski Joseph M.
Striker Michael J.
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