Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1976-03-18
1977-03-08
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75200, 75224, 75225, 75150, 148126, B22F 300
Patent
active
040110761
ABSTRACT:
Thin-walled beryllium structures are prepared by plasma spraying a mixture of beryllium powder and about 2500 to 4000 ppm silicon powder onto a suitable substrate, removing the plasma-sprayed body from the substrate and placing it in a sizing die having a coefficient of thermal expansion similar to that of the beryllium, exposing the plasma-sprayed body to a moist atmosphere, outgassing the plasma-sprayed body, and then sintering the plasma-sprayed body in an inert atmosphere to form a dense, low-porosity beryllium structure of the desired thin-wall configuration. The addition of the silicon and the exposure of the plasma-sprayed body to the moist atmosphere greatly facilitate the preparation of the beryllium structure while minimizing the heretofore deleterious problems due to grain growth and grain orientation.
REFERENCES:
patent: 3791851 (1974-02-01), Taylor et al.
patent: 3793014 (1974-02-01), Rossenwasser
patent: 3853549 (1974-12-01), Baird et al.
Hovis, Jr. Victor M.
Northcutt, Jr. Walter G.
Carlson Dean E.
Hunt Brooks H.
Larcher Earl L.
The United States of America as represented by the United States
Zachry David S.
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