Metal powder suited for powder metallurgical purposes, and a process for manufacturing the metal powder
AssigneeSKF Nova AB
InventorBengt G. S. Lundgren
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Abstract
A steel powder suited for powder metallurgical purposes consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape. Such a steel powder may be produced by causing molten steel to form at least one discrete, relatively thin film on a relatively cold metal surface of great cooling capacity, causing the thin film to solidify extremely rapidly on the metal surface to form a brittle amorphous to compact-grained, in principle completely dendrite-free steel film, and crushing or grinding the brittle film into a powder of an irregularly cornered particle shape.
Claims10
A steel powder suited for powder metallurgical purposes, characterized in that it consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape.
A process for the production of a steel powder suited for powder metallurgical purposes, comprising the steps of (1) causing, in a vacuum or protective gas, molten steel of such composition that rapid cooling of thin films of the melt produces brittle crushable films to impinge upon a cold metal surface having great cooling capacity moving rapidly and substantially across the direction of delivery of the molten steel, thereby forming a thin, brittle, and easily crushed, amorphous to compact-grained, essentially dendrite-free steel film, and (2) crushing or grinding the steel film into a powder of an irregularly cornered particle shape.
Dependencies are inferred from the claim text.