Method for surface activation of water atomized powders by pickl

Details Method for surface activation of water atomized powders by pickl Method for surface activation of water atomized powders by pickl

1988-09-19

1990-10-02

Chaudhuri, Olik

Powder metallurgy processes

Forming articles by uniting randomly associated metal particles

Powder pretreatment

134 3, 134 27, 134 28, 134 29, 134 41, 419 30, C23G 102

Patent

active

049604597

ABSTRACT:
A method for pickling and consolidating water atomized metallic powders to reduce surface oxides. The technique includes introducing the powder into an acid bath--preferably nitric acid and hydrofluoric acid, rinsing the powder, introducing the powder into an alkaline bath, rinsing the powder and then consolidating the powder into a workpiece. Alternatively, the powder can be additionally introduced into a second acid bath and/or placed into a finishing boric acid bath before consolidation.

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patent: 4818482 (1989-04-01), Poole et al.
Derwent WPI Acc. No. 83-710341/28, Jul. 1982.
Derwent WPI Acc. No. 86-179958/28, May 1986.
Derwent WPI Acc. No. 87-069679/10, Jan. 1987.

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