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The thermal shock behavior of isotropic and anisotropic porous Si 3 N 4 was evaluated using the water‐quenching technique. The critical temperature difference for crack initiation was found to be strongly dependent on the ratio of fracture strength to elastic modulus. Because of a very high strain‐to‐failure, anisotropic porous Si 3 N 4 showed no macroscopic cracks and was able to retain its strength even at a quenching‐temperature difference of ∼1400°C.
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She et al. (2003) studied this question.
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