Method for making a porous tantalum pellet

Details Method for making a porous tantalum pellet Method for making a porous tantalum pellet

1976-08-09

1977-11-22

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75211, 75214, 148126, B22F 100, B22F 704

Patent

active

040594424

ABSTRACT:
A quantity of tantalum powder is heated to a temperature greater than 400.degree. C in a non-oxidizing atmosphere to dissolve the tantalum oxide film existing on the surfaces of the tantalum particles. The treated powder without conventional organic binders is compressed to form a unitary pellet in a mold maintained in an inert atmosphere. The pellet is subsequently heated in a vacuum to sinter the particles together and to provide a porous tantalum pellet having carbon-free tantalum surfaces and a large exposed surface area per unit weight of tantalum. Electrolytic capacitors made from these pellets exhibit a larger CV product per unit weight of tantalum and/or a lower leakage current than for comparable capacitors known heretofore.

REFERENCES:
patent: 3299326 (1967-01-01), Gluyas et al.
patent: 3430108 (1969-02-01), Daedliker
patent: 3496425 (1970-02-01), Kirkpatrick et al.
patent: 3697255 (1972-10-01), Baldwin et al.
patent: 3843360 (1974-10-01), Hanaoka et al.

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