Process for making an improved tantalum powder and high capacita

Details Process for making an improved tantalum powder and high capacita Process for making an improved tantalum powder and high capacita

1993-04-26

1995-09-05

Reynolds, Bruce A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Solid electrolytic capacitor

419 30, H01G 9052, H01G 915

Patent

active

054484472

ABSTRACT:
A process for producing capacitor grade powder, electrodes, and finished capacitors therefrom having reduced electrical leakage characteristics. The powder is prepared by reacting Group V-B base materials with quantities of between 500 to 7000 ppm of nitrogen and 700 to 3000 ppm of oxygen. Electrical leakage is reduced by at least 28% for electrodes anodized at 100 volts or greater in comparison with electrodes and finished capacitors made from undoped materials. A range of specific charge of up to 25,000 uFV/g is achieved for sintering temperatures of 1400.degree. C. to 1800.degree. C.

REFERENCES:
patent: 3427132 (1969-02-01), Goon
patent: 3825802 (1974-07-01), Kumagai et al.
patent: 3984208 (1976-10-01), Moulin et al.
patent: 4154609 (1979-05-01), Hahn
patent: 4423004 (1983-12-01), Ross
patent: 4483819 (1984-11-01), Albrecht et al.
patent: 4544403 (1985-10-01), Schiele et al.

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