Sintered composite of silicon carbide and silicon nitride

Details Sintered composite of silicon carbide and silicon nitride Sintered composite of silicon carbide and silicon nitride

1995-08-29

1996-07-30

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 97, C04B 35596

Patent

active

055411436

ABSTRACT:
The invention relates to a sintered composite of silicon carbide and silicon nitride. The sintered composite includes a polycrystalline matrix and polycrystalline aggregates dispersed in the matrix. The matrix includes silicon carbide grains, first silicon-nitride grains and a first sintering aid thereof. Each of the aggregates includes second silicon-nitride grains and a second sintering aid thereof. The aggregates have an average diameter within a range from 10 .mu.m to 50 .mu.m. This average diameter is defined as a diameter of a circle having an area which is the same as the average area of the aggregates on a two-dimensional section of the sintered composite. The sintered composite is light in weight and superior in strength and fracture toughness at high temperature as well as at room temperature.

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