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US 4,260,582 AGranted
Differential expansion volume compaction
AssigneeThe Charles Stark Draper Laboratory, Inc.
InventorsKaplesh Kumar, Dilip K. Das
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Abstract
Method and apparatus for the formation of a molded article from powders and powder compacts of a material by pressure compaction of the powders under the influence of a thermally driven differential volume expansion of first and second elements constraining the powders. The volume expansion achieves a trippling of the compaction effect.
Claims14
A process for the formation of high density pressed parts comprising:
- subjecting a volume of particulate material which is to be formed into a pressure molded shape to a compressive, article producing force produced by thermal expansion of an expandible element;
- and
- constraining said element against expansion except toward said material to produce amplification of the compressive force on said material by flow of said element.
A process for the formation of a molded article from powders of a material comprising:
- constraining of volume of said powders of said material within a mold against an element having a thermal expansion characteristic differing from that of said mold;
- changing the temperature of said element over a range to a temperature which, as a result of the difference in volume thermal expansion of said mold and said element causes compression of said powders;
- and
- maintaining said temperature for a predetermined interval to produce a compression formed article.
1 more element
Dependencies are inferred from the claim text.