Abstract
Y2O3-Nd2O3-doped β-Si3N4 was sintered at 1700° to 1900°C for 4h in 10MPa N2, and the effect of the amount of the additives and sintering temperatures on stength, fracture toughness and the microstructure was investigated. A dense material (>98% of the theoretical) was obtained by firing at 1900°C with addition of 1 to 10mol% of oxides. Rod-like β-Si3N4 grains developed by firing at 1900°C increased the fracture toughness up to 7.8MPa√m because of the pull-out and the crack-deflection mechanism. The material made from β-Si3N4 powder had a high Weibull modules than that from α-Si3N4 powder.
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