Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-11-08
1993-08-17
King, Roy
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505733, 505742, 427 62, 4273762, 4274193, 4274192, 427596, 427569, 427592, B05D 512, B05D 302, B05D 306
Patent
active
052368920
ABSTRACT:
A method for manufacturing a superconducting article, comprising the steps of: forming a first layer comprising a mixture of LnBa.sub.2 Cu.sub.3 O.sub.x and Ln.sub.2 BaC oxid, on the surface of a substrate, said Ln being an optional rare earth element; then locally and sequentially/heating and melting the first layer to locally and sequentially form a molten pool of the mixture of the first layer, and causing the molten pool of the first layer to locally and sequentially solidify, thereby arranging the a-b plane of the crystal of the mixture of the first layer in parallel with the surface of the substrate; then forming a second layer comprising a mixture of at least CuO and BaCuO.sub.2 on the surface of the first layer; and then melting the mixture of the second layer to cause the resultant melt of the mixture of the second layer to diffusion-react with Ln.sub.2 BaCu oxide, in the first layer so as to convert the first and second into a film of a superconducting substance comprising LnBa.sub.2 Cu.sub.3 O.sub.x, in which the a-b plane of the crystal thereof is arranged in parallel with the surface of the substrate; thereby manufacturing a superconducting article comprising the substrate and the film of the superconducting substance formed on the surface of the substrate.
REFERENCES:
Jin et al, "High critical currents in Y-Ba-Cu-O superconductors" Appl. Phys. Lett. 52(24) Jun. 1988 pp. 2074-2076.
Severin et al, "Superconducting YBa.sub.2 Cu.sub.3 Ox thin layers by solid state diffusion", Mat. Res. Bull. Vol. 23(1988) pp. 707-717.
Kumakura et al, "Ba-Y-Cu-O superconducting tape prepared by surface diffusion process," Jpn. J. Appl. Phys. 26(7) Jul. 1987 L1172-1173.
Applied Physics Letters, vol. 52, No. 11, Mar. 14, 1988, pp. 924-926, New York, US; C. Chang et al.: "Effects of silver and gold on the YBaCuO superconducting thin films with the use of Ag/Cu/BaO/Y.sub.2 O.sub.3 and Ag/Cu/BaO/Y.sub.2 O.sub.3 structures".
Japanese Journal of Applied Physics, vol. 26, No. 9, Sep. 1987, pp. L1451-L1452, Tokyo, JP; Y. Sorimachi: "Formation of superconducting Y-Ba-Cu-O thin films by the solid phase reaction between BaCO.sub.3 /Cu/Y.sub.2 O.sub.3 layers on single crystalline SrTiO.sub.3 substrate".
Tachikawa et al, Fabrication of Superconducting Y-Ba-Cu Oxide Through an Improved Diffusion Process, Japanese Journal of Applied Physics, vol. 27, No. 8, Aug., 1988, pp. L1501-L1503.
Kabasawa Makoto
Kosuga Shigeyoshi
Ono Moriaki
Shinbo Yukio
King Roy
NKK Corporation
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