Tantalum powder and electrolytic capacitor using same

Details Tantalum powder and electrolytic capacitor using same Tantalum powder and electrolytic capacitor using same

1995-09-06

1997-02-25

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75365, 75369, 75255, 204292, 361529, 420427, B22F 920

Patent

active

056055617

ABSTRACT:
Tantalum powder obtained by adding magnesium powder to tantalum powder which is prepared by reducing potassium tantalum fluoride with sodium metal, without conventional heat-treatment for agglomeration, to remove oxygen present in the tantalum powder, then washing with an acid and drying; an anode body for electrolytic capacitors produced by sintering the tantalum powder; and, an electrolytic capacitor which comprises the anode body incorporated therein. The tantalum powder has a large specific surface area and accordingly, the electrolytic capacitor in which the anode body produced from the tantalum powder is incorporated has an extra high capacity, i.e., a CV ranging from 70000 to 80000. The probability of causing ignition during the production process is substantially reduced and thus the tantalum powder can be handled with safety.

REFERENCES:
patent: 4041359 (1977-08-01), Mizushima et al.
patent: 4356028 (1982-10-01), Bates
patent: 4483819 (1984-11-01), Albrecht et al.
patent: 4645533 (1987-02-01), Izumi
patent: 4954169 (1990-09-01), Behrens
patent: 5082491 (1992-01-01), Rerat
patent: 5442978 (1995-08-01), Hildreth et al.
patent: 5448447 (1995-09-01), Chang

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