Treatment of tantalum powder

Details Treatment of tantalum powder Treatment of tantalum powder

1983-03-24

1983-12-27

Hunt, Brooks H.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 30, 419 31, 419 34, 29570, 361433, 252402, B22F 100, B22F 102

Patent

active

044230044

ABSTRACT:
Tantalum powder for electrolytic capacitors is treated with a non-aqueous solution of ammonium thiocyanate in N,N'-dimethylformamide or N-methylpyrrolidinone after the powder has been subjected to a thermal treatment in the absence of oxygen step and before the powder is exposed to an oxygen-containing fluid to prevent oxygen uptake by the powder. The thermal treatment step is carried out at 700.degree. C. and above.

REFERENCES:
patent: 3152893 (1964-10-01), Storchheim
patent: 3180329 (1963-08-01), Sherman
patent: 3299326 (1967-01-01), Gluyas et al.
patent: 3697255 (1972-10-01), Baldwin et al.

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