研究了一种Si3N4陶瓷材料在室温、800及1100℃条件下的动态疲劳特性．结果发现与ZrO2及玻璃陶瓷相似，在高应力速率区，仍出现断裂应力随应力速率的提高而迅速下降的现象。同时应力腐蚀指数n随温度的升高而下降．通过断口分析，表明Si3N4陶瓷材料高温动态疲劳失效主要是由于晶间玻璃相软化流动造成的．
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.
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