Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Superconducting wire – tape – cable – or fiber – per se
Patent
1998-01-06
1999-12-07
Yamnitzky, Marie
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Superconducting wire, tape, cable, or fiber, per se
505237, 505450, 505236, 505430, 505501, 505704, 428702, 428930, H01L 3912, H01L 3924
Patent
active
059998334
ABSTRACT:
A method for the production of a superconducting oxide tape having a Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10 (Bi-2223) structure interposed between silver sheets, which method consists essentially of preparing a sandwich structure having interposed between silver sheets a molded layer of a superconducting oxide precursor powder consisting essentially of Bi, Pb, Sr, Ca, Cu, and O obtained from a raw material substance composed of, in atomic composition ratio, 1.00 of Bi, 0-0.2 of Pb, 0.9-1.1 of Sr, 0.9-1.1 of Ca and 1.3-1.7 of Cu, and O, heating the sandwich structure in an atmosphere consisting of oxygen and an inert gas, having an oxygen partial pressure in the range of 0-5%, and kept at a temperature in the range of 830-850.degree. C., thereby melting the molded layer, then causing the atmosphere to retain the heating temperature and meanwhile increasing the oxygen partial pressure, thereby inducing precipitation of crystal grains possessing a Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 (Bi-2212) structure and excelling in orientation, and subsequently maintaining the oxygen partial pressure and temperature at the time of precipitation of the crystal grains, thereby transforming the structure into the (Bi-2223) structure while retaining the particle diameter of the crystal grains and the state of orientation, and superconducting oxide tape produced by the method.
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T.G. Holesinger, et al., "Isothermal Melt Processing of Bi-2212 Thick Films", Physica C 243 (1995), pp. 93-102.
T.G. Holesinger, et al., Directional Isothermal Growth of Highly Textured Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.Y, Applied Physics Letters, vol. 63, No. 7, Aug. 16, 1993, pp. 982-984.
R.D. Ray II, et al., "Synthesis of Ag Sheathed, Bi-2212 Tapes by a Novel Liquid Wicking Method", Physica C 251 (1995), pp. 1-6.
Ryoji Funahashi, et al., "Critical Current Density for Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.X /Ag Tapes Prepared Using an Isothermal Partial Melting Method Under Controlled Atmospheres", Physica C 273 (1997) 337-341.
Funahashi Ryoji
Ishikawa Hiroshi
Matsubara Ichiro
Ueno Kazuo
Agency of Industrial Science & Technology, Ministry of Internati
Xu Hong J.
Yamnitzky Marie
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