Fibrous tantalum and capacitors made therefrom

Details Fibrous tantalum and capacitors made therefrom Fibrous tantalum and capacitors made therefrom

1991-05-31

1993-06-08

Walsh, Donald P.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75728, B22F 100

Patent

active

052175260

ABSTRACT:
A method of making a tantalum capacitor of improved specific capacitance (and volumetric efficiency) is described. Short tantalum fibers are precipitated out of a carrier liquid to form a felt, or tumbled to form fiber containing particles, and in either case subsequently bonded so as to form a felt or particles containing the fibers in random orientation in substantially non-aligned array. These particles or felt are heated to bond the fibers together, purify and (optionally) cylindricalize them. The felt or particles can be processed in conventional fashion thereafter to form the capacitor. Cylindricalized fibers and pellets of increased surface area are also described.

REFERENCES:
patent: 2277687 (1942-03-01), Brennan
patent: 2299667 (1942-10-01), Waterman
patent: 3373320 (1968-03-01), Krock et al.
patent: 3742369 (1973-06-01), Douglass
patent: 3827865 (1974-08-01), Douglass
patent: 4138712 (1979-02-01), Leszlauer
patent: 4502884 (1985-03-01), Fife
"Fiber Composite Materials", ASM, 1965, Chapman & Hall Ltd., pp. 229-231.
NASA Tech Briefs, "Sintered Fiber Electrodes", Dec., 1990.

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