Metal treatment – Compositions – Heat treating
Patent
1983-11-25
1984-08-07
Stallard, W.
Metal treatment
Compositions
Heat treating
419 28, 419 30, 419 33, 75246, B22F 100, B22F 316
Patent
active
044642059
ABSTRACT:
A powder metallurgical process for producing a wrought product characterized by a low level of residual impurities. The process comprises the steps of: comminuting metal powder to effect a reduction in particle size, at least 60% of the comminuted particles being capable of passing through a -270 mesh Tyler screen; blending the metal powder with a softer metal-bearing powder; heating the blended powder particles at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of powder particles; cold-isostatically pressing the crushed mass of powder; sintering the powder in the absence of an encapsulating member under conditions which effect a reduction in the nitrogen, oxygen and carbon levels of the powder; and hot working the sintered powder into a wrought product. The wrought product has less than 0.015% carbon.
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Hickl Anthony J.
Kumar Prabhat
Rivers Ronald D.
Cabot Corporation
Dropkin Robert F.
Phillips Joseph J.
Schuman Jack
Stallard W.
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