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Stability of Si3N4-Al2O3-ZrO2 composites in oxygen environments

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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= ∼100kJ mol−1)), whereas at 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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Authors and Affiliations

  1. Research Institute for Ceramics Technology, National Research Council, Faenza, Italy

    A. Bellosi, P. Vincenzini & G. N. Babini

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  1. A. Bellosi
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  2. P. Vincenzini
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  3. G. N. Babini
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Bellosi, A., Vincenzini, P. & Babini, G.N. Stability of Si3N4-Al2O3-ZrO2 composites in oxygen environments. J Mater Sci 23, 2348–2354 (1988). https://doi.org/10.1007/BF01111886

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  • DOI: https://doi.org/10.1007/BF01111886

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