Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1989-02-06
1990-05-08
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 23, 419 25, 419 28, 419 29, 419 39, 419 42, 419 53, B22F 706
Patent
active
049236717
ABSTRACT:
Method of producing powder-metallurgical objects, specifically elongate objects such as rods, sections, tubes or the like, wherein a powder of metal and/or metal alloys of great hardness, particularly tool steel or high-speed steel powder, is charged into a thin-walled capsule, said capsule is then sealed so as to be airtight, is heated, and subjected to isostatic compression to produce a blank which will then undergo hot-working, specifically extrusion, for the production of the finished product. In a first alternative, the airtight and sealed capsule is initially heated to a temperature higher than 1,000.degree. C. Following through-heating of the capsule, the latter is maintained at an elevated temperature for a prolonged period. Then the capsule is slowly cooled and subjected to cold isostatic compression prior to final shaping. In a second alternative, the capsule is sealed so as to be airtight, and then subjected to an initial cold isostatic compression. Then the pressed blank is heated to a temperature higher than 1,000.degree. C. Following through-heating of the pressed blank, the latter is maintained at an elevated temperature for a prolonged period of time, whereupon it is subjected to hot-working, specifically extrusion, either immediately or after a preceding cooling step.
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Lechert Jr. Stephen J.
Mai Ngoclan T.
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