Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Reexamination Certificate
2005-06-14
2005-06-14
Turner, Archene (Department: 1775)
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
C501S088000, C501S089000, C501S092000, C501S094000, C501S095100, C501S095200, C501S096100
Reexamination Certificate
active
06905992
ABSTRACT:
A ceramic composite made by compacting a starting powder blend. The composite includes between about 50 volume percent and about 99 volume percent of a ceramic matrix; and between about 1 volume percent and about 50 volume percent as-processed silicon carbide whiskers. The ceramic composite having a fracture toughness (KIC) of greater than about 4.0 MPam1/2. The ceramic has a silicon carbide whisker density as measured in whiskers per square millimeter equal to or less than about 1500 times the volume percent of silicon carbide whiskers, but in a density sufficient for the ceramic composite to have the fracture toughness.
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Mehrotra Pankaj K.
Wu Shanghua
Kennametal Inc.
Prizzi John J.
Turner Archene
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