Abstract
The microstructures and mechanical properties of Si3N4-SiC composites containing 8 to 46 vol% Sic, which were prepared from combustion synthesis and HIP sintering without additives, were studied and compared with those of Si3N4 prepared from conventional methods. Transmission electron microscopic observation revealed the existence of some small SiC particles within the Si3N4 matrix grains. The fracture toughness of the Si3N4-SiC composite was independent of Si, C content, probably because the SiC grains were smaller than the critical size for effective toughening and the formation of elongated Si3N4 grains was not promoted by the Sic dispersions. But SiC additions modified the high-tempera-ture strength of the Si3N4-SiC composites and increased the microhardness at all temperatures.
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