Method for fabricating high-jc thallium-based superconducting ta

Details Method for fabricating high-jc thallium-based superconducting ta Method for fabricating high-jc thallium-based superconducting ta

1993-10-04

1995-03-21

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Plural heating steps including sintering

419 8, 419 20, 419 21, 419 22, 419 41, 419 43, 505501, 505430, B22F 700, H01B 1200

Patent

active

053993128

ABSTRACT:
A process for fabricating Thallium-based superconducting tapes comprising the steps of: (1) preparing a powder mixture having a nominal composition of (Tl.sub.1-x-y Bi.sub.y Pb.sub.z)(Ba.sub.2-z Sr.sub.z)Ca.sub.2 Cu.sub.3 O.sub.9 ; (2) placing the powder mixture into a silver tube and drawing and/or swaging the silver tube containing the powder mixture into a wire having a pre-determined diameter, wherein x and y are real numbers between 0.2 and 0.4, and z is a real number between 0 and 2; (3) rolling the wire into a tape having a pre-determined thickness; and (4) subjecting the tape to a two-stage single-sintering process at two respective sintering temperatures. The two-stage single-sintering process of the present invention allows Thallium-based superconducting tapes to be fabricated which exhibit substantially increased critical current density, without causing a substantially increased cost and complexity, as do other prior art processes, such as the double-sintering process.

REFERENCES:
patent: 5210069 (1993-05-01), Chiang
patent: 5242897 (1993-09-01), Wong et al.
patent: 5262391 (1993-11-01), Morita et al.
patent: 5268354 (1993-12-01), Blanchet-Fincher
patent: 5300482 (1994-04-01), Doi et al.
patent: 5318948 (1994-06-01), Okada et al.
patent: 5332721 (1994-07-01), Xin et al.

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