Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Reexamination Certificate
2007-05-15
2007-05-15
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
C501S127000, C501S096300
Reexamination Certificate
active
11311209
ABSTRACT:
A ceramic body, as well as a method of making the ceramic body, wherein in one aspect a hot-pressing method is used to produce the ceramic body. In another aspect, a sintering to full density method is used to produce the ceramic body. The hot-pressed ceramic body contains between about 15 volume percent and about 35 volume percent of a boron carbide phase and at least about 50 volume percent of alumina, and the substrate has a fracture toughness (KIC, 18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5. The sintered to full density ceramic body contains between about 15 volume percent and about 50 volume percent of a boron carbide irregular-shaped phase and at least about 50 volume percent alumina. The substrate further includes at least one of the following components (a) through (b) wherein the sum of the amounts of components (a) and (b) is equal to an effective amount to achieve full densification wherein components (a) and (b) include (a) a metal component including one or more of aluminum, magnesium and zinc; and (b) a reduction component containing carbon.
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Inte
Wu Shanghua
Yeckley Russell L.
Group Karl
Kennametal Inc.
Prizzi John J.
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