Dispersion alloyed hard metal composites and method for...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/05 (2006.01) B22F 1/00 (2006.01)

Patent

CA 2172274

A method for forming a sintered hard metal composite is provided in which unsintered nodules of a pre-blended hard metal powder of a first grade are uniformly dispersed into unsintered nodules of a pre-blended hard metal composite of a second grade. The pre-blended hard metal powders form a composite powder blend which is subsequently pressed and sintered to form the dispersion alloyed hard metal composite. A sufficient amount of pressing lubricant is provided to one of the pre-blended hard metal powders so that each of the hard metal powders shrinks at approximately the same rate relative to the application of pressure during the compacting process. The pressing lubricant is added to that hard metal powder which shrinks more during sintering. By providing uniform shrinkage of the constituent powder grades, migration of the binder from one constituent grade to the other constituent grade is minimized, thereby allowing the composite powder blend to achieve superior properties because each of the constituent grades maintains its own integrity. In addition, the uniform shrinkage of the constituent powders prevents irregular surface conditions of the "as sintered" surface.

Procédé de formation d'un composite en métal dur fritté dans lequel des nodules non frittés d'une poudre de métal dur prémélangée d'une première qualité sont dispersés uniformément dans des nodules non frittés d'un composite en métal dur prémélangé d'une seconde qualité. Les poudres de métal dur prémélangées forment un mélange poudreux composite qui est ensuite pressé et fritté pour former ledit composite en métal dur allié par dispersion. Une quantité suffisante de lubrifiant de pressage est ajoutée à l'une des poudres de métal dur prémélangées si bien que chacune des poudres de métal dur rétrécit au même degré environ par rapport à l'application de pression pendant le processus de compactage. Le lubrifiant de pressage est ajouté à la poudre de métal dur qui rétrécit le plus pendant le frittage. Grâce au rétrécissement uniforme des poudres des deux qualités, la migration du liant du constituant d'une qualité au constituant de l'autre qualité est réduite au minimum, ce qui permet d'obtenir un mélange poudreux composite à qualités supérieures parce que chaque constituant d'une qualité donnée conserve ses propres caractéristiques. En outre, le rétrécissement uniforme des poudres constituantes empêche les irrégularités de surface de la surface frittée.

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