Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1988-04-04
1989-03-07
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75240, 75243, 75246, 75247, 419 11, 419 18, 419 19, 419 23, 419 25, 419 31, 419 32, 419 33, 419 38, 419 49, 252512, 252514, C22C 2912
Patent
active
048102890
ABSTRACT:
A process of hot isostatic pressing of powders to form electrical contacts is characterized by the steps: (A) mixing powders, 1 in the Drawing, from metal containing powder or metal containing powder plus carbon powder, where at least one of Ag and Cu is present, (B) thermal cleaning treatment of the powder, 2 in the Drawing, (C) granulating the thermally treated powder, 3 in the Drawing, (D) uniaxially pressing the powders without heating, 5 in the Drawing, to provide a compact, (E) placing at least one compact in a pressure-transmitting, pressure-deformable container, 6 in the Drawing, and surrounding each compact with fine particles of a separating material, (F) evacuating air from the container, 7 in the Drawing, (G) sealing the compacts inside the container, 8 in the Drawing, (H) hot isostatic pressing, 9 in the Drawing, the compacts through the pressure transmitting material at a pressure from 352 kg/cm.sup.2 to 2,115 kg/cm.sup.2 and a temperature from 0.5.degree. C. to 100.degree. C. below the melting point of the lower melting powder constituent, to provide simultaneous hot-pressing and densification of the compacts, (I) gradually cooling and releasing the pressure on compacts, 10 in the Drawing, and (J) separating the compacts from the container, 11 in the Drawing, where there is no heating of the compacts in the process before step (H).
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Hoyer Norman S.
Iyer Natraj C.
Cillo Daniel P.
Lechert Jr. Stephen J.
Westinghouse Electric Corp.
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