High temperature mechanical behaviour of silicon nitride ceramics
Keywords:Ceramic materials, Microstructure, Mechanical properties, Deformation mechanisms,
The high temperature mechanical behaviour of two silicon nitride-based ceramic materials has been studied: N 7202, made by low pressure sintering with yttria, alumina and magnesia as additives, and N 3208, made by high pressure sintering with yttria and alumina as additives. Both materials are β-silicon nitride. The results have been analysed in terms of the classical creep equation. The stress exponent was n = 0.4 for N 7202 and n = 0.5 for N 3208, whereas the average apparent activation energy was Q ≈ 500 kJ/mole for both materials.Transmission electron microscopy studies have allowed to determine the microstructural features of these materials.
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