Effect of Temperature on Dynamic Fatigue Behaviour of Si3N4 Material

Abstract

Abstract: The dynamic fatigue behaviours of Si₃N₄ material at room temperature, 800and 1100℃ were investigated. It was discovered that the fracture strength
decreases with the increase of σ at a high stress rate, and that the stress corrosion exponent n decreases also with the temperature increasing. The former is the same
as that in transformation toughening ceramics and glass-ceramics, but is of some deviation from the theoretical prediction. The fractographic observation showed that
the dynamic fatigue failure mechanism of Si₃N₄ at elevated temperature is the softing of the glass phase in grain boundaries.

Key words: Si₃N₄, dynamic fatigue, stress corrosion exponent

CLC Number:

TB321

WANG Hong-Jie,WANG Yong-Lan,JIN Zhi--Hao,ZHOU Hui-Jiu. Effect of Temperature on Dynamic Fatigue Behaviour of Si₃N₄Material[J]. Journal of Inorganic Materials.

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Effect of Temperature on Dynamic Fatigue Behaviour of Si₃N₄Material

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