Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-08-22
1993-04-27
Bell, Mark L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505704, 505740, 264 65, 264DIG26, 501152, 501126, C04B 3500, C04B 3564, H01L 3924
Patent
active
052062112
ABSTRACT:
Process for the production of an elongate body of longitudinally aligned acicular crystals (3) of the superconducting substance REBa.sub.2 Cu.sub.3 O.sub.6.5+y, with RE=rare earth metal, 0<y<1, in which fine-grained powder (1) with a particle diameter of 0.1-5 .mu.m is sintered for 1-100 h at a temperature of 600.degree.-850.degree. C. with application of a pressure of 100-5,000 bar. For the production of a filament conductor, the powder is filled into a small Ag tube (4), drawn, and pressure sintered at 800.degree. C./10 h under 2,000 bar.
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Holland et al., "Physical Properties of the Quaternary Oxide Superconductor YBa.sub.2 Cu.sub.3 O.sub.7 ", Accounts of Chem. Research, vol. 21, Jan. 1988 p. 8.
Chen et al., "Texture Development in YBa.sub.2 Cu.sub.3 O.sub.x by Hot Extrusion and Hot-pressing", Jan. AGS, vol. 70 #12 Dec. 1987 p. C-388-90.
Applied Physics Letters, vol. 52, No. 21, May 23, 1988, Amer. Inst. of Physics, Grader et al.: "Improved press forging of Ba.sub.2 YCu.sub.3 O.sub.x superconductor".
Japanese Journal of Applied Physics, vol. 27, No. 7, Jul. 1988, Takenaka et al.: "Superconducting properties of grain-oriented YBa.sub.2 Cu.sub.3 O.sub.7-x Ceramics".
Advanced Ceramic Materials, vol. 2, No. 3B, Special Issue, Jun. 1987.
Robinson et al.: "Sinter-forged YBa.sub.2 Cu.sub.3 O.sub.7- ".
McCallum et al.: "Problems in the production of YBa.sub.2 Cu.sub.3 O.sub.x superconducting wire".
Asea Brown Boveri Ltd.
Bell Mark L.
Bonner C. M.
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