Si3N4 composites reinforced with SiC whiskers were fabricated using injection molding and HIP treatment. The strength and fracture toughness were significantly improved over monolithic Si3N4. Microstructure of composites before and after HIP treatment was examined by transmission electron microscopy. No reaction layer was observed between whiskers and matrices. HIP treatment eliminated voids at the interface. The interfacial bonding was excellent and no pull-out of whiskers occurred on fracture. Factors controlling the improvement of properties are discussed based on the microstructural analysis.
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Kobayashi et al. (1986) studied this question.
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