Abstract
Adding silicon carbide particles to silicon nitride and subjecting the mixture to hot-isostatic-pressing process after pressureless sintering increases both bending strength and Young's modulus, although fracture toughness remains at almost the same. This is because that the added SiC particles inhibit excess grain growth of β-Si3N4 resulting in reducing flaw size for fracture. The SiC particles of less than 0.2μm in diameter are trapped within the β-Si3N4 grains through hot-isostatic-process with microcracks which reduce imposed stress resulting in further contribution in high strength. SiC particles, however, do not alter the fracture characteristics for fracture toughness.
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