Methods of manufacturing Nb.sub.3 Al superconducting wire and co

Details Methods of manufacturing Nb.sub.3 Al superconducting wire and co Methods of manufacturing Nb.sub.3 Al superconducting wire and co

1993-12-13

1996-04-09

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Electrical device making

148 98, 505815, 505919, 505920, 505921, H01L 3924

Patent

active

055049842

ABSTRACT:
A method of manufacturing an Nb.sub.3 Al superconducting wire includes a step of forming a wire by a jelly-roll process, a first thermal step of heating the obtained wire at a temperature of 500.degree. to 700.degree. C. for at least 10 hours for diffusing Al in Nb while suppressing formation of Nb.sub.3 Al, and a second thermal step of heating the wire, after the first thermal step, at a temperature of 800.degree. to 1050.degree. C. for about 0.01 to 10 hours, thereby forming Nb.sub.3 Al. In the jelly-roll process, a sheet of Nb and a sheet of Al are lap-wound on a copper core. The material obtained by such lap winding is inserted in a copper pipe, and then subjected to drawing. The drawn wire is cut to obtain a plurality of segments. The plurality of segments are bundled and charged in a copper pipe, and then subjected to drawing. The resulting drawn wire is subjected to the first and second thermal steps. In this manner a superconducting material having a high critical current density under a high magnetic field is obtained.

REFERENCES:
patent: 4003762 (1977-01-01), Ceresara et al.
patent: 4008102 (1977-02-01), Muller et al.
patent: 4088512 (1978-05-01), Pickus et al.
patent: 4223434 (1980-09-01), Wang et al.
patent: 4983228 (1991-01-01), Taub et al.
Article entitled: "Development of 10KA Class Nb.sub.3 Al Superconducting Cable by Jelly-Roll Process" by T. Ando et al.; Reprinted from IEEE Transactions On Magnetics, vol. 27, No. 2, Mar. 1991.

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