Metal working – Method of mechanical manufacture – Electrical device making
Patent
1979-02-01
1980-09-23
Husar, Francis S.
Metal working
Method of mechanical manufacture
Electrical device making
148 115F, 428662, 294205, 75208CS, 148 115P, H01V 1100, B22F 324
Patent
active
042234344
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.
REFERENCES:
patent: 3815224 (1974-06-01), Pinkus
patent: 4018942 (1977-04-01), Muller et al.
Douglas Kent E.
Pickus Milton R.
Wang John L.
Bernheim William S.
Denny James E.
Gaither Roger S.
Husar Francis S.
Rising V. K.
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