Ceramic composition
AssigneeGeneral Electric Company
InventorStephen J. Burden
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Abstract
Improved ceramic compositions useful for cutting tools and the like are described. They are composed of an essentially homogeneous admixture of sintered powders of an aluminum oxide base material with other refractories including zirconium oxide, titanium oxide, hafnium oxide, titanium nitride, zirconium nitride, and tungsten or molybdenum carbide. In addition to their common and improved properties of hardness and strength, many of these compositions may be made by simple cold-pressing and sintering procedures. This avoids the known drawbacks of conventional hot press production.
Claims9
In a ceramic composition comprising an essentially homogeneous admixture of sintered powders of an aluminum oxide base refractory material, the improvement wherein said composition additionally contains zirconium oxide and tungsten carbide in an amount sufficient to enhance wear resistance while permitting said powder to undergo pressureless sintering.
In a ceramic composition comprising an essentially homogeneous admixture of sintered powders of an aluminum oxide base refractory material, the improvement wherein said composition additionally contains zirconium oxide, tungsten carbide, and titanium nitride, the aluminum oxide comprising from 67-87%, the zirconium oxide comprising 10-15%, the titanium nitride comprising 1-15% and the tungsten carbide comprising 2-3% by total weight.
Dependencies are inferred from the claim text.