Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Using magnetic field
Patent
1988-07-19
1994-08-02
Derrington, James
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Using magnetic field
264 22, 264 24, 505727, 505739, 505490, H01L 3912
Patent
active
053345789
ABSTRACT:
According to this method of manufacturing a superconductor, powder materials of Y.sub.2 O.sub.3, BaCO.sub.3 and CuO are first prepared as raw materials and blended and mixed to the composition Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x. The mixed powder thus obtained is compression-molded and thereafter sintered. A sintered body thus obtained shows the Meissner effect under the temperature of liquid nitrogen. This sintered body is pulverized into fine particles. A magnetic field is applied to the fine particles at the temperature of liquid nitrogen, thereby to select only superconductive particles. The selected superconductive particles are compression-molded during application of a magnetic field and then sintered, thereby to obtain a superconductor having high critical current density.
REFERENCES:
patent: 4975411 (1990-12-01), Danby
Farrell, D. E., et al, Superconducting Properties of Aligned Crystalline Grains of Y.sub.1 Ba.sub.2 C.sub.43 O.sub.7-8 in Physical Review B--Sep. 1987, The American Chemical Society.
Brodsky et al, High-Temperature Superconductors, Symposium held Nov. 30-Dec. 4, 1987, Boston, Mass., Materials Research Society vol. 99.
Derrington James
Sumitomo Electric Industries Ltd.
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