Process for the powder-metallurgical production of a workpiece

Details Process for the powder-metallurgical production of a workpiece Process for the powder-metallurgical production of a workpiece

1990-09-06

1992-12-29

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder shape or size characteristics

419 38, 419 49, 419 54, 419 55, 419 87, 419 58, 419 60, B22F 100

Patent

active

051749521

ABSTRACT:
A process for the powder-metallurgical production of a workpiece by filling a binder-free and solvent-free, dry metal powder or ceramic powder into a mold, precompacting the powder by tapping and presintering it for 1/2 hour to 1 hour at 0.65 to 0.85 times the absolute melting temperature without significant shrinkage, adjacent powder particles being joined merely at their contact points by necking to give a skeletal formed body. The formed body is taken out of the mold and finish-sintered at at least 0.9 times the absolute melting temperature for at least 1 hour without additional support by a mold. Advantageously, the sintered body is additionally hot-isostatically pressed containerless in order to reach at least 98% of the theoretical density.

REFERENCES:
patent: 3888663 (1975-06-01), Reichman
patent: 4271114 (1981-06-01), Ohno
patent: 4836978 (1989-06-01), Watanabe et al.
"Plastic Metals: From Fiction to Reality with Injection Molded P/M Materials", Billiet, Parmatech Corporation, pp. 45-52 (undated).
"Pulvermetallurgisches Spritzgiessen-ein neues Formgebungsverfahren fur Sinterteile komplizierter Gestalt", Lange, et al., Konstruktion, 1988, pp. 233-238.
"Powder Casting and Metal Injection Moulding", Sjoberg, Metal Powder Report Manuscript submission, Sep., 1987.

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