Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1978-03-24
1981-01-13
Schafer, Richard E.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
294205, 75226, 75227, 148126, B22F 314, B22F 324
Patent
active
042447380
ABSTRACT:
Articles are formed by hot pressing metal or metallic particulates 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. 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 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 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 and appear to be strain hardened during the hot pressing thereof.
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