composites of varying content from 0 to 52 vol.% were prepared by pressureless sintering. When these composites were sintered at the mechanical properties such as elastic modulus, strength and toughness increased with increasing content. On the other hand, at a sintering temperature of , the mechanical properties reduced gradually with increasing content. The main reason was deduced from the onset of spontaneous microcracking and the critical particle size for microcracking was calculated approximately 5.6 .

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