Sintered silicon nitride

Details Sintered silicon nitride Sintered silicon nitride

2005-12-20

2005-12-20

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C501S097200, C501S097400, C264S683000

Reexamination Certificate

active

06977233

ABSTRACT:
Sintered silicon nitride products comprising predominantly β-silicon nitride grains in combination with from about 0.1 to 30 mole % silicon carbide, and grain boundary secondary phases of scandium oxide and scandium disilicate. Such products have high fracture toughness, resistance to recession, and resistance to oxidation at temperatures of at least 1500° C. Methods for preparing sintered silicon nitride products are also disclosed.

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