B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
18/1120, 75/165
B22F 3/00 (2006.01) B22F 3/14 (2006.01)
Patent
CA 1147522
METHOD OF AND APPARATUS FOR HOT PRESSING PARTICULATES ABSTRACT 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. Addition- ally, 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 conven- tional 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 and appear to be strain hardened during the hot pressing thereof.
324037
Iit Research Institute
Macrae & Co.
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