Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1978-11-28
1980-11-04
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75200, 75208R, B22F 300
Patent
active
042317967
ABSTRACT:
An improved method for preparing a cermet comprises preparing a compact having about 85 to 95 percent theoretical density from a mixture of metal and metal oxide powders from a system containing a eutectic composition, and inductively heating the compact in a radiofrequency field to cause the formation of an internal molten zone. The metal oxide particles in the powder mixture are effectively sized relative to the metal particles to permit direct inductive heating of the compact by radiofrequency from room temperature. Surface melting is prevented by external cooling or by effectively sizing the particles in the powder mixture.
REFERENCES:
patent: 2743199 (1956-04-01), Hull et al.
patent: 3796673 (1974-03-01), Clark et al.
Holder et al., "Directional Solidification by Internal Zone Melting of Cr.sub.2 O.sub.3 Composites,"Conference on In Situ Composites 1976, Jackson et al., Editors, pp. 107-113.
Chapman et al., "UO.sub.2 -W Cermets Produced by Unidirectional Solidification,"Journal of Amer. Ceramic Soc., 53 #1, Jan. 1970.
Hartzell et al., Generalization of Internal Centrifugal Zone Growth of Metal-Ceramic Composites, USERD C00-2407-4, Aug. 1976.
Michel et al., Journal of Crystal Growth, 43 (1978), "Growth from Skull-Melting of Zirconia-Rare Earth Oxide Crystals,"pp. 546-548.
Scott et al., "Skull Melting of Synthetic Minerals,"DOE Rept. #La-7080-MS, Los Alamos Scientific Laboratory.
Clark Grady W.
Holder John D.
Pasto Arvid E.
Denny James E.
Hamel Stephen D.
Hunt Brooks H.
The United States of America as represented by the United States
Uzzell Allen H.
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