Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1974-10-11
1976-11-16
Schafer, Richard E.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75223, 75226, B22F 314
Patent
active
039922022
ABSTRACT:
Method for producing a powder-metallurgy article having at least one aperture therein; the article is produced by providing a dense, nondeformable core having a configuration corresponding to the desired configuration of the aperture in said article; the core is placed in a particle charge having a composition corresponding to that desired in the article; the position of the core within the particle charge corresponds to the desired position of the aperture within the final compacted product. The core has a coefficient of thermal expansion greater than that of said article, whereby after compacting removal of the core from the article to create the aperture is facilitated. A separating medium may be used between the core and the powder. The asembly constituting the container, core and powder is hot isostatically compacted, and upon cooling the container and core are removed from the densified article.
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patent: 3168399 (1965-02-01), Takahashi et al.
patent: 3313621 (1967-04-01), Mott
patent: 3531848 (1970-10-01), Gripshover et al.
patent: 3571850 (1971-03-01), Pohto et al.
patent: 3599281 (1971-08-01), Boyer
patent: 3738830 (1973-06-01), Kimura et al.
patent: 3803702 (1974-04-01), Bratt et al.
patent: 3844778 (1974-10-01), Malone et al.
Dulis Edward J.
Fleck James N.
Powell Joseph W.
Crucible Inc.
Schafer Richard E.
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