B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
75/161
B22F 3/14 (2006.01) B22F 1/00 (2006.01) B22F 3/15 (2006.01) C22C 32/00 (2006.01) H01H 11/04 (2006.01)
Patent
CA 1334633
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) uni- axially 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) evacuat- ing 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/cm2 to 2,115 kg/cm2 and a temperature from 0.5°C to 100°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 (G).
594894
Hoyer Norman Stanley
Iyer Natraj Chandrasekar
Male Alan Thomas
Corporation Eaton
Riches Mckenzie & Herbert Llp
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