Abstract
Beta-Si3N4 powder made by the imide-decomposition method was gas-pressure sintered at 1800°C for 4h in 1MPa N2 gas. This material had a microstructure of “in-situ composite” and excellent mechanical properties (strength: 780MPa, fracture toughness: 7.5MPa·m1/2), whereas β-Si3N4 powder made by the silicon nitridation method required sintering temperatures higher than 1900°C to attain similar microstructure and mechanical properties. β-Si3N4 powder by the imide-decomposition method had excellent properties for grain growth at low temperatures.
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