Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Patent
1982-05-06
1984-02-14
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Post sintering operation
419 28, 419 47, 419 48, 419 49, B22F 300, B22F 324
Patent
active
044316054
ABSTRACT:
The present invention discloses a method for densifying previously sintered parts constructed of powdered metals, ceramics or the like to nearly 100% theoretical density. The method of the present invention comprises heating the parts above their liquid phase temperature and then applying a pressure in the range of 50-2,000 psi to the parts for a predetermined period of time and simultaneously maintaining the parts at or above their liquid phase temperature. The method of the present invention achieves complete closure of even large voids and the elimination of substantially all porosity within the part.
REFERENCES:
patent: 3320056 (1967-05-01), Stoops
patent: 3441392 (1969-04-01), Divecha et al.
patent: 3765958 (1973-10-01), Freche et al.
patent: 4244738 (1981-01-01), Storchheim
Pp. 6 and 64 of Sam Sonov G. V. Hot Pressing Technology in the Soviet Machine Bldg. and Metallurgical Industries.
Goetzel Treatise on Powder Metallurgy, vol., 1949 (pp. 424-425).
Hunt Brooks H.
Lueth Roy C.
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