Method of making dimensionally reproducible compacts

Details Method of making dimensionally reproducible compacts Method of making dimensionally reproducible compacts

1989-06-30

1990-03-20

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75232, 75234, 75235, 75236, 75237, 75238, 75240, 75241, 75243, 75244, 75246, 75247, 75249, 419 11, 419 12, 419 13, 419 15, 419 17, 419 18, 419 19, 419 21, 419 23, 419 25, 419 31, 419 33, C22C 2912

Patent

active

049098411

ABSTRACT:
A process of hot pressing of materials to form articles or compacts is characterized by the steps: (A) providing a compactable particulate mixture; (B) uniaxially pressing the particles without heating to provide article or compact (22); (C) placing at least one article or compact (22) in an open pan (31) having an insertable frame (32) with edge surfaces (34) that are not significantly pressure deformable, where the inside side surfaces of the frame are parallel to the central axis B--B of the open pan, and where each article or compact is surrounded by fine particles of a separating material; (D) evacuating air from the container and sealing the articles or compacts inside the container by means of top lid (36); (E) hot pressing the compacts at a pressure from 352.5 kg/cm.sup.2 to 3,172 kg/cm.sup.2 to provide simultaneous hot pressing and densification of the articles or compacts; (F) gradually cooling and releasing the pressure; and, (G) separating the articles or compacts from the container, where there is no heating of the compacts in the process before step (E).

REFERENCES:
patent: 4677264 (1987-06-01), Okumura et al.
patent: 4810289 (1989-03-01), Hoyen
patent: 4834939 (1989-05-01), Bornstein

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