Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1980-04-08
1983-11-08
Rutledge, L. Dewayne
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
264120, 100232, 425330, 419 42, 419 44, 419 49, 419 52, 419 53, 419 60, B22F 316, B22F 314, B30B 704
Patent
active
044140282
ABSTRACT:
A particulate mass to be sintered is imbedded in a mold which comprises a porous mass of particulate refractory material enclosed within a flexible membrane. Six press units are provided for applying compressive pressures externally to the mold, together or in sequence, whereby to subject the sinterable mass to pressures in the respective directions, under the control of a preprogrammed control unit which receives clock pulses from a source and stimulates the respective press units. A flexible heating coil imbedded in the mold is supplied with alternating current from a source to inductively heat up the sinterable mass and the adjacent mold material, to enable sintering to occur. The sinterable mass may have been precompacted into a self-supporting so-called "green compact", or it may be supported in a self-supporting shell carried within and forming part of the mold. The mold preferably comprises three layers having characteristics chosen so as to assist in heating up the sinterable mass uniformly.
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"High-Density Graphite Moldings", Kobayashi et al., Chemical Abstracts, vol. 85, 1976, artical No. 9669n.
Inoue-Japax Research Incorporated
Rutledge L. Dewayne
Zimmerman J. J.
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