Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1987-12-23
1989-08-29
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 42, 419 48, 419 49, B22F 700
Patent
active
048615463
ABSTRACT:
A container for holding powdered metal is formed by electroplating a layer of metal over a pattern having a configuration which corresponds to the configuration of an article to be formed. A rigid core is surrounded by the pattern material and the layer of metal. The pattern material is removed from the layer of metal to form a container in which the core is disposed. The core and container may be held against relative movement by gripping the core with the layer of metal or by pin elements extending between the core and layer of metal. The container is filled with metal powder. The metal powder is cold compacted to plastically deform the particles of metal powder without significant bonding between the particles of metal powder. The metal powder is cold compacted by exposing the container to fluid at a relatively low temperature and high pressure. Metal powder particles are pressed against each other and against the core by the fluid pressure applied against the container to plastically deform the metal powder particles. After being cold compacted, the metal powder is hot compacted to bond the particles of metal powder together and form a unitary body which surrounds the core. The core is subsequently removed from the unitary body to form a recess in the body.
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Lechert Jr. Stephen J.
Precision Castparts Corp.
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