Abstract
A survey is presented of the range of microstructures which may be developed in Si3N4 and Sialon ceramics by liquid phase sintering and post-sintering heat treatment. The mechanical behaviour, oxidation and corrosion resistance of these microstructures is reviewed and the various mechanisms for environmental degradation are identified. A specific problem is exemplified for the catastrophic strength — loss of Sialons under oxidation/corrosion conditions.
It is concluded that microstructural design has to be a compromise between mechanical and environmental behaviour and also ease of fabrication. Pressureless — sintered Sialons with α’ /ß’/YAG microstructures offer a good compromise for sub-1300°C performance. In the 13001500°C interval the non-sialon compositions (such as Si3N4/Y2Si2O7) produce environmentally stable microstructures with good mechanical behaviour if fabricated under HIP or GPS conditions.
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Lewis, M. (1994). Microstructural Design of Si3N4 and Sialon Ceramics in Relation to Combined Mechanical and Environmental Behaviour. In: Nickel, K.G. (eds) Corrosion of Advanced Ceramics. NATO Science Series E: (closed), vol 267. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1182-9_32
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DOI: https://doi.org/10.1007/978-94-011-1182-9_32
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