Cylindrical metal fibers made from tantalum, columbium, and allo

Details Cylindrical metal fibers made from tantalum, columbium, and allo Cylindrical metal fibers made from tantalum, columbium, and allo

1993-03-10

1994-02-08

Walsh, Donald P.

Metal treatment

Process of modifying or maintaining internal physical...

Treating loose metal powder, particle or flake

75952, 75255, 419 24, 419 31, 420425, 420427, B22F 100

Patent

active

052845311

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: 3295951 (1967-01-01), Fincham et al.
patent: 3461047 (1969-08-01), Lenny
patent: 4502884 (1985-03-01), Fife
patent: 4722756 (1988-02-01), Hard
patent: 4960471 (1990-10-01), Fife et al.

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