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US 4,606,738 AGranted
Randomly-oriented polycrystalline silicon carbide coatings for abrasive grains
AssigneeGeneral Electric Company
InventorStephen C. Hayden
Life of this patent
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AssigneeGeneral Electric Company
InventorStephen C. Hayden
Estimating the term…
Disclosed is a composite abrasive particle comprising a core abrasive crystal and a silicon carbide coating inherently bonded to substantially all of the exterior surfaces of said core crystal, said silicon carbide coating characterized by silicon carbide crystals having a random orientation substantially independent of the structure of the core crystal, the outer surface of the coating being conformationally irregular. Aggregates of the composite abrasive particles are interconnected by a matrix of silicon carbide which has an open structure. Preferred core abrasive crystals are diamond or cubic boron nitride. The composite abrasive particles preferably are made by infiltrating core crystals coated with non-diamond carbonaceous material with fluid silicon to produce a mass of core crystals bonded together by silicon carbide and elemental silicon, leaching substantially all of the silicon from the bonded mass with a silicon leaching agent, sub-dividing the resulting leached mass, and recovering the composite abrasive particles.
An improved composite abrasive particle comprising a core abrasive crystal and a silicon carbide coating adherently bonded thereto, said silicon carbide coating being conformationally irregular and comprising silicon carbide crystals having a random orientation substantially independent of the structure of said core abrasive crystal and made by the steps comprising:
A porous composite abrasive aggregate comprising core abrasive crystals disposed within a silicon carbide matrix, said silicon carbide adherently bonded to substantially all of the exterior surfaces of each of said core crystals, said silicon carbide matrix being porous, conformationally irregular, and comprising silicon carbide crystals having a random orientation substantially independent of the structure of the core abrasive crystals and made by the steps comprising:
An improved abrasive element of coated abrasive particles embedded in a bonding matrix, wherein the improvement comprises coated abrasive particles comprising core crystals selected from the group consisting of diamond and cubic boron nitride, and an irregular silicon carbide coating adherently bonded to substantially all of the exterior surfaces of said core crystals, said silicon carbide coating characterized by silicon carbide crystals which are conformationally irregular and have a random orientation substantially independent of the structure of said core abrasive crystal and made by the steps comprising:
Dependencies are inferred from the claim text.