Abstract
A study is summed up on the microstructure and mechanical properties of ceramic-matrix composites using silicon nitride, Si3N4, as the matrix and SiC whiskers as the reinforcement. It has been found that an Si3N4 matrix synthesized by a plasmachemical process and long SiC whiskers (with a length-to-diameter ratio of more than 50) enhance crack resistance, high-temperature strength, and microhardness, whereas an Si3N4 matrix produced by self-propagating high-temperature synthesis and short SiC whiskers (with a length-to-diameter ratio of less than 50) enhance thermal endurance. The proposed composites hold promise as candidates for use in engineering applications where wear resistance, thermal endurance, and shock resistance are critical.
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