Method of making electrolytic capacitor anodes

Details Method of making electrolytic capacitor anodes Method of making electrolytic capacitor anodes

1986-06-17

1987-05-12

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making porous product

419 34, 419 37, 419 38, 419 63, 204292, 264 63, 252512, B22F 100

Patent

active

046648836

ABSTRACT:
A powder of a film-forming metal, such as tantalum, is combined with a binder of polyethylene oxide and ammonium carbonate. The powder-binder combination is pressed to form an anode body and then heated to about 300.degree. C. for about 4 hours to remove the binder. The polyethylene oxide is a superior binding agent producing anodes of high porosity and strength. The ammonium carbonate reacts with liquid polyethylene oxide to release large quantities of gas which sweeps the polyethylene oxide out of the anode pores, resulting in an unusually small amount of binder residue and yielding capacitors with low d.c. leakage.

REFERENCES:
patent: 4059442 (1977-11-01), Bernard
patent: 4347084 (1982-08-01), Hahn et al.
patent: 4483819 (1984-11-01), Albrecht et al.

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