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US 2007/0129232 A1Published application
Ceramic body containing alumina and boron carbide
AssigneeKennametal Inc.
InventorsRussell Yeckley, Shanghua Wu
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Abstract
A ceramic body that includes between about 15 volume percent and about 35 volume percent of a boron carbide irregular-shaped phase, and at least about 50 volume percent alumina, and the ceramic body has a fracture toughness (KIC, 18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5.
Claims17
A ceramic body comprising:
- between about 15 volume percent and about 35 volume percent of a boron carbide irregular-shaped phase, and at least about 50 volume percent alumina, and
- the ceramic body has a fracture toughness (KIC,18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5.
A ceramic body comprising:
- between about 15 volume percent and about 35 volume percent of a boron carbide irregular-shaped phase, and at least about 50 volume percent alumina;
- the ceramic body has a fracture toughness (KIC,18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5;
- and
- the ceramic body further comprises residue from a sintering aid in the starting powder mixture and the sintering aid is selected from the group comprising yttrium oxide, ytterbium oxide, yttrium aluminum gamet, lanthanum oxide, chromium oxide, and other rare earth oxides.
1 more element
Dependencies are inferred from the claim text.