Deoxidation treatment for consolidated atomized metal powder

Details Deoxidation treatment for consolidated atomized metal powder Deoxidation treatment for consolidated atomized metal powder

1991-10-01

1992-05-12

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

134 3, 134 28, 134 29, 134 30, 134 91, 419 49, 419 63, 419 66, B22F 100

Patent

active

051125722

ABSTRACT:
The invention provides a method for removing the oxide surface from water atomized metal powders containing an oxidizer capable of oxidizing chromium from a trivalent to a soluble hexavalent state, whereby chromium oxides are removed from the metal powder surface. The powder is then treated with a dilute acid solution essentially devoid of hydrofluoric acid to remove other hydrated oxides from the metal powder surface. The powder is then water washed and dried.

REFERENCES:
patent: 4818482 (1989-04-01), Poole et al.
patent: 4960459 (1990-10-01), Poole et al.

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