Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-10-27
1991-06-25
Ryan, Patrick J.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505701, 505702, 505703, 505704, 428209, 428457, 428688, 428930, 427 62, 29599, 20419224, B32B 900
Patent
active
050266837
ABSTRACT:
A superconducting wire and a process for fabricating such a wire. The present invention relates specifically to the fabrication of a wire using a ceramic superconducting material. Initially, a quantity of highly pure high temperature superconducting material is obtained. The superconducting material may be fabricated by any one of a number of known fabrication methods such as by aqueous coprecipitation, conventional sol gel techniques or solid state reaction processes.
Once a ceramic superconducting material in particulate form is obtained, surface impurities on the particles are removed. One such surface cleaning procedure is known as "sputtering." Sputtering strips the surface atoms from the surface of the superconducting material, leaving only pure superconducting ceramic.
The superconductive ceramic produced according to the procedure outlined above is then used in the formation of a superconducting wire. There are alternative methods of manufacturing the wire, one of which is to obtain a hollow tube of a conventional conducting material such as gold, silver, copper, or aluminum. The tube is then filled with the cleansed particulate superconducting material.
In an alternative embodiment of the present invention, a solid wire is obtained. The superconducting ceramic is then electrostatically coated onto the wire by pulling the wire continuously through an environment of the superconducting ceramic. Particles of the superconducting material are caused electrostatically to adhere to the surface of the wire.
REFERENCES:
patent: 4826808 (1989-05-01), Yurek et al.
patent: 4828685 (1989-05-01), Stephens
S. Jin et al., "High Tc Superconductors--Composite Wire Fabrication", Appl. Phys. Lett., 51, No. 3 (Jul. 20, 1987).
O. Kohno et al., "Characteristics of High-Tc Oxide Wire", Physica 148B, 429-431 (1987).
N. Sadakata et al., "Fabrication and Superconducting Properties of High Tc Oxide Wire", Mat. Res. Soc. Symp. Proc., 99 293-296 (1988).
H. Sekine et al., "Fabrication of Multifilamentary Y-Ba-Cu-O Oxide Superconductors", Appl. Phys. Lett., 52, No. 26, 27 (Jun., 1988).
M. Kavishma et al., "The Manufacturing Process and Properties of the High Tc Oxide Superconducting Wire", Applied Superconductivity Conference, San Francisco (1988).
G. A. Whitlow et al., "Silver Encases High Temperature Superconductor Ribbons Produced by Rolling", Pres. at Applied Superconductivity Conference, San Francisco (1988).
Y. Yamada et al., "Critical Current Density of Wire Type Y-Ba-Cu Oxide Superconductor", Japanese Jour. of Appl. Phys. 26, No. 5, L865-L866 (May, 1987).
General Atomics
Ryan Patrick J.
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