Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1995-08-11
1997-04-22
Neuder, William P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 19, 428547, B22F 100
Patent
active
056237235
ABSTRACT:
A method of heat treating a green compact having an exposed surface. The method includes the steps of: providing a green compact comprised of a hard carbide and binder; placing a powder of grain refiner on at least one portion of the exposed surface of the green compact; and heat treating the green compact and grain refiner powder so as to diffuse the grain refiner toward the center of the green compact thereby forming a peripheral zone inwardly from the exposed surface in which the grain refiner was placed, and forming an interior zone. The peripheral zone having a grain size that is smaller than the grain size of the bulk zone.
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Antolin Stanislav
Neuder William P.
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