Method of making bulk porous anodes for electrolytic capacitors

Details Method of making bulk porous anodes for electrolytic capacitors Method of making bulk porous anodes for electrolytic capacitors

1976-05-03

1978-01-10

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75200, B22F 300

Patent

active

040677354

ABSTRACT:
A method of making bulk porous anodes for electrolytic capacitors consists of preparing a suspension of a valve metal powder, selected from the group consisting of tantalum, niobium and titanium in an amount of 30-250 parts by weight, a binding material, which is also a charger of powder metal particles, constituting a 0.2-1.5% aqueous solution of a salt selected from the group consisting of sodium and ammonium salts of carboxymethyl cellulose of celluloseglycolic acid in an amount of 10-35 parts by volume, and a dispersion medium being alcohol or acetone an amount of 15-30 parts by volume. Said suspension is subjected to the effect of an electric field established by a voltage applied to the electrodes and causing deposition of metal powder of the latter with a bulk porous body being thus formed, which is then sintered at a temperature of 1600-2000.degree. C to produce a bulk porous anode.
Said method is intended for the production of electrolytic capacitors of various shapes and sizes.

REFERENCES:
patent: 3403303 (1968-09-01), Klein
patent: 3424952 (1969-01-01), Vierow
patent: 3433632 (1969-03-01), Elbert et al.
patent: 3473915 (1969-10-01), Pierret
patent: 3653882 (1972-04-01), Petrasek et al.
patent: 3796565 (1974-03-01), Hancock

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