Method for producing aperture-containing powder-metallurgy artic

Details Method for producing aperture-containing powder-metallurgy artic Method for producing aperture-containing powder-metallurgy artic

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.

REFERENCES:
patent: 3007744 (1961-11-01), Gordon et al.
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.

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