Powder metallurgy
AssigneeCyclops Corporation, Universal-Cyclops Specialty Steel Division
InventorsHerbert L. Black, Mark Somerville, Jerome Schwertz
Life of this patent
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Abstract
A powder metallurgy consolidation process in which the unconsolidated metal powder is placed in a sealable mold; the mold is evacuated and sealed; the mold is placed in an open top container larger than the mold; the space between the mold and container is filled with a free flowing refractory powder, preferably minus twenty mesh powder graphite; and the sealed mold and its contents are heated in the container to metal sintering temperatures without special atmospheres.
Claims8
A process for consolidating powder metals comprising the steps for
- (a) placing unconsolidated powder metal in a sealable glass mold which becomes plastic upon heating,
- (b) evacuating the atmosphere from the powder filled mold,
- (c) sealing the mold,
- (d) placing the mold in an open top refractory container and packing with free flowing refractory powder selected to freely flow at all the temperatures encountered in the process,
- (e) heating the mold and contents of the mold to a temperature at which sintering of the powder metal takes place and holding at this temperature for a time sufficient to cause substantially complete densification of the powder metal,
- (f) cooling and removing the mold to recover a dense article, and whereby the glass mold is supported by the free flowing refractory powder as the mold becomes plastic and shrinks in volume as its contents densify.
A process for consolidating powder metals comprising the steps for
- (a) placing the unconsolidated powder metal in a sealable glass mold,
- (b) evacuating the atmosphere from the powder filled mold,
- (c) sealing the mold,
- (d) placing the mold in an open top clay-graphite crucible and packing with a refractory powder comprising at least 50 volume percent carbon minus twenty mesh U.S. Sieve Series powder,
- (e) heating the mold and contents of the mold to temperatures at which sintering of the powder metal takes place for a time sufficient to cause substantially complete densification of the powder metal, and
- (f) cooling and removing the mold to recover a dense article.
Dependencies are inferred from the claim text.