Method of making dimentionally reproducible compacts

Details Method of making dimentionally reproducible compacts Method of making dimentionally reproducible compacts

B - Operations, Transporting

01

J

18/1123

B01J 3/06 (2006.01) B22F 3/12 (2006.01) B22F 3/14 (2006.01) B22F 3/15 (2006.01) H01H 11/04 (2006.01)

Patent

CA 2017840

55,286 ABSTRACT OF THE DISCLOSURE A process of hot pressing of materials to form articles or compacts is characterized by the steps: (A) providing a compactable particulate mixture; (B) uni- axially 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 side surfaces (34) that are not signi- ficantly pressure deformable, where the 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/cm2 to 3,172 kg/cm2 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 con- tainer, where there is no heating of the compacts in the process before step (E).

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