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1. (WO1979000833) METHOD OF AND APPARATUS FOR HOT PRESSING PARTICULATES
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/1979/000833 International Application No.: PCT/US1979/000186
Publication Date: 18.10.1979 International Filing Date: 23.03.1979
IPC:
B22F 3/14 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
F
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3
Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
12
Both compacting and sintering
14
simultaneously
Applicants:
Inventors:
Priority Data:
88974524.03.1978US
Title (EN) METHOD OF AND APPARATUS FOR HOT PRESSING PARTICULATES
(FR) METHODE ET APPAREIL DE COMPRESSION A CHAUD DE PARTICULES
Abstract:
(EN) Articles (11) are formed by hot pressing metal or metallic particulates (12) at temperatures between about the recrystallization temperature and about the solidus temperature for the metal or alloy after first preheating the particulates and the die (14). The particulates are hot pressed for a very short period of time, usually less than five seconds at about 12 tons per square inch or greater to compact and weld the particles together into a wrought metal article (11) having substantially greater tensile strength and a better isotropic strength than a conventional cast or powder metallurgy article of the same metal or alloy. Additionally, the articles (11) can be made with 99+ percent of theoretical density and with substantially no gas porosity. The article"s surfaces may be smooth and held to relatively close tolerances with a good uniformity of surface hardness. Articles can be formed using conventional die presses to press articles repetitively without welding of the articles to die walls even when using aluminum particulates. The preferred particulates are substantially larger in size than the conventional powder materials used in powder metallurgy nd appear to be strain hardened during the hot pressing thereof.
(FR) Des articles (11) sont formes par compression a chaud de particules metalliques (12) a des temperature se situant entre la temperature de recristallisation et la temperature de solidification du metal ou du solidus de l"alliage apres un premier prechauffage des particules et de la matrice (14). Les particules sont comprimees a chaud pendant une periode de temps tres courte, generalement inferieure a cinq secondes, a 12 tonnes par pouce carre ou plus pour compacter et souder les particules en un article de metal travaille (11) ayant une resistance a la rupture et une resistance isotrope substantiellement plus grandes que celles d"une piece coulee avec le meme metal ou alliage. En outre, les articles (11) peuvent etre fabriques avec une densite theorique de 99% et plus et sans aucune porosite. Les surfaces de l"article peuvent etre lisses et conformes aux tolerances, avec une bonne uniformite de la durete de surface. Les articles peuvent etre formes en utilisant les presses conventionnelles pour fabriquer des articles de maniere repetee sans que ceux-ci ne se soudent aux parois de la matrice meme lorsqu"il s"agit de particules d"aluminium. De preference, les particules sont plus grandes que les materiaux en poudre conventionnels utilises dans la metallurgie des poudres et elles sont ecrouies pendant leur compression a chaud.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)