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US 4,956,012 AGranted
Dispersion alloyed hard metal composites
AssigneeNewcomer Products, Inc.
InventorsRobert S. Jacobs, Jack Krall
Life of this patent
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AssigneeNewcomer Products, Inc.
InventorsRobert S. Jacobs, Jack Krall
Estimating the term…
A hard metal composite is formed from a mixture of two or more pre-blended, unsintered hard metal composites in which the properties of each constituent are different. The constituent components are selected so that they have different grain sizes, different binder contents, different metal carbide or binders, or some combination of these. Primarily, the constituents are chosen on the basis of their properties and compatability, and are chosen to utilize the superior properties of one of the constituents without detrimentally affecting the desirable properties of the other. As an example, a pre-blended composite having a superior hardness may be dispersed in a second composite having a superior toughness with the resultant material having a hardness which approaches that of the harder constituent yet maintaining the toughness of the matrix constituent.
A sintered hard metal composite comprising unsintered nodules of a pre-blended hard metal powder of a first grade uniformly dispersed among unsintered nodules of a pre-blended hard metal of a second grade, said hard metal powder of a first grade and said hard metal powder of a second grade having distinctively different properties from each other, wherein the integrity of the constituent grades is maintained after sintering, and the resulting composite exhibits hardness and toughness properties greater than the average of those properties of the hard metal powder of the first grade and the hard metal powder of the second grade.
A method of forming a sintered hard metal composite comprising the steps:
A sintered hard metal composite comprising unsintered nodules of a first pre-blended hard metal powder comprising submicron tungsten carbide particles and between 1% and 15% binder uniformly dispersed among unsintered nodules of a pre-blended hard metal powder comprising coarser grain tungsten carbide particles and between 1% and 25% binder, wherein the integrity of the constituent hard metal powders is maintained after sintering, and the resulting composite exhibits properties greater than the average of those properties of the first hard metal powder and the second hard metal powder.
Dependencies are inferred from the claim text.