Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1976-10-21
1978-08-01
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75226, B22F 300
Patent
active
041040619
ABSTRACT:
The invention relates to an improved method of removing gaseous or volatile contaminants from metal powders or porous compacts thereof wherein the powder or compact is subjected to a procedure comprising vacuum treatment, back filling with an innocuous depurative gas and another vacuum treatment to remove gaseous contaminants and depurative gas. The evacuation and back filling steps are usually repeated several times. Preferably, the depurative or wash gas is one which is capable of reacting with the metal powder or alloy constituents thereof to form a solid reaction product. After the gaseous and/or volatile contaminants are removed, the powder or compact is compressed to full density and then subjected to additional fabrication, if so desired. The decontamination procedures of the invention can reduce the volatile and gaseous contaminants to such low levels that essentially no porosity is developed in the powder metallurgical products during subsequent high temperature working or thermal treatments even if the temperatures of such treatments are higher than the decontamination temperatures. As a result, improved microstructure, strength and toughness are attained in the final product.
REFERENCES:
patent: 3384481 (1968-05-01), Broverman
patent: 3698962 (1972-10-01), Kasak et al.
patent: 3700435 (1972-10-01), Chandhok
patent: 3728111 (1973-04-01), Stromblad et al.
patent: 3954458 (1976-05-01), Roberts
Calrow Paul E.
Hunt Brooks H.
Kaiser Aluminum & Chemical Corporation
Lynch Edward J.
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