常圧焼結窒化けい素の破壊特性 : 室温即時破壊強度と高温静疲労寿命の関係

概要

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Fast fracture tests at room temperature and static fatigue tests at 1000℃ on silicon nitride were carried out, and the relationship between the fracture condition and the defect which leads to specimen failure was investigated using a scanning electron microscope. Furthermore, the crack propagation parameters, A and n at 1000℃, were determined from the fast fracture strength distribution at room terperature and the fatigue life distribution at 1000℃ using the specimens having microcracks introduced using a #200 diamond wheel. These parameters were used to discuss the correlation between the fast fracture strength at room temperature and the static fatigue life at 1000℃. The conclusions obtained are summarized as follows : The static fatigue life distribution at 1000℃ obtained from the experiment does not coincide with the distribution predicted from the fast fracture strength distribution of the annealed specimens at room temperature. Moreover, the kind of defect which leads to specimen failure and the site of fracture origin change with the change of fracture conditions.
一般社団法人日本機械学会の論文
1994-05-25