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Oxidation behaviour of the sintered Si3N4-Y2O3-Al2O3 system

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Abstract

The oxidation behaviour of silicon nitride composed of Si3N4, Y2O3, Al2O3, AlN and TiO2 was investigated in dry and wet air at 1100–1400 °C. The oxidation rates were confirmed to obey the parabolic law. An activation energy of 255 kJ mol−1 was calculated from the Arrhenius plots of the results of oxidation in an air flow. In still air the oxidation rate was larger than that in an air flow, but the oxidation rate in flowing air was not affected by the air flow rate. α-cristobalite and Y2O3·2SiO2 were formed in oxidized surface layers. These crystal phases increased with increasing oxidation temperature. In particular, a higher content of α-cristobalite was obtained in still air oxidation. The existence of water vapour in flowing air greatly promoted the oxidation.

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Authors and Affiliations

  1. Department of Materials Chemistry, Yokohama National University, Tokiwadai, Hodogayaku, 240, Yokohama, Japan

    K. Komeya, Y. Haruna & T. Meguro

  2. New Materials Engineering Laboratory, Toshiba Corporation, Suehirocho Tsurumiku, 230, Yokohama, Japan

    T. Kameda & M. Asayama

Authors
  1. K. Komeya
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  2. Y. Haruna
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  3. T. Meguro
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  4. T. Kameda
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  5. M. Asayama
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Concurrent with Kanagawa Academy of Science and Technology.

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Komeya, K., Haruna, Y., Meguro, T. et al. Oxidation behaviour of the sintered Si3N4-Y2O3-Al2O3 system. J Mater Sci 27, 5727–5734 (1992). https://doi.org/10.1007/BF01119729

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  • DOI: https://doi.org/10.1007/BF01119729

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