Abstract
Oxidation of dense Si3N4-Al2O3-ZrO2 and Si3N4-Al2O3 compacts, at 873–1773 K and 98 KPa air atmosphere, results in two different parabolic oxidation regimes. Oxygen diffusion is likely to be the governing step at low temperature (T ∼1623 K (ΔH = ∼800kJ mol−1) metal cation diffusion through the grain boundary phase appears limiting. The excellent stability in oxygen environments of the Si3N4-Al2O3-ZrO2 composites compared to other ZrO2-Si3N4 materials derives from (i) absence of easy-to-oxidize Zr-O-N phases; (ii) reduced amount of grain boundary phase, and possibly (iii) decreased solubilization rate of the nitride phases in the high viscous oxide film.
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