Abstract
Since silicon nitride is hard to sinter, it is general to sinter with small amounts of sintering aids, such as Al2O3 and Y2O3. Therefore, very thin glass phase formed at the grain boundary has an influence on high temperature mechanical properties of sintered silicon nitride. Silicon nitride is one of major candidate materials for potential structural components in high-performance turbine application. In service, components in turbine application may be subjected to loading at elevated temperatures. It is, therefore, essential to gain detailed understanding of fracture behavior at elevated temperatures. From this viewpoint, the characteristics of high temperature strength 1–5 and creep strength 6–9 have been actively investigated lately for silicon nitride in comparison with other ceramic materials. However, the detailed fracture behavior of silicon nitride including the influence of intergranular glass phase at elevated temperatures has not always been obvious.
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