Title: Method of manufacturing a niobium-aluminum-germanium superconductive material

Abstract: A method for manufacturing flexible Nb.sub.3 (Al,Ge) multifilamentary superconductive material in which a sintered porous niobium compact is infiltrated with an aluminum-germanium alloy and thereafter deformed and heat treated in a series of steps at different successively higher temperatures preferably below 1000.degree. C. to produce filaments composed of Nb.sub.3 (Al,G3) within the compact. By avoiding temperatures in excess of 1000.degree. C. during the heat treatment, cladding material such as copper can be applied to facilitate a deformation step preceding the heat treatment and can remain in place through the heat treatment to also serve as a temperature stabilizer for supeconductive material produced. Further, these lower heat treatment temperatures favor formation of filaments with reduced grain size and, hence with more grain boundaries which in turn increase the current-carrying capacity of the superconductive material.

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Inventors: Wang, John L. (San Francisco, CA, US)
Pickus, Milton R. (Oakland, CA, US)
Douglas, Kent E. (Redondo Beach, CA, US)

Application Number: 008622
Filing Date: 1979-02-01
Publication_date: 1980-09-23
Assignee: The United States of America as represented by the United States (Washington, DC)
Primary Class(es): 29/599 148/98, 257/E39.006, 419/5, 419/24, 419/27, 419/28, 428/662, 505/920, 505/921
Other Classes:
US Patent Ref:

3815224	Jun, 1974	Pinkus	29/420.
4018942	Apr, 1977	Muller et al.	29/599.

Other Refs:
Primary Examiner: Husar, Francis S.
Assistant Examiner: Rising, V. K.
Attorney: Denny; James E., Gaither; Roger S., Bernheim; William S.