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Oxidation behavior of a Mo(Si,Al)2 composite at 900–1600 °C in dry air

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Abstract

The oxidation of a Mo(Si,Al)2-based composite is investigated in the temperature range 900–1600 °C in dry air. Exposure time was 72 h. Comparisons are made with the oxidation behavior of a conventional MoSi2-based material. Cross-sections are examined with scanning electron microscopy and transmission electron microscopy; the phase composition is analyzed by X-ray diffraction and convergent beam electron diffraction. The material forms a continuous external α-alumina scale throughout the temperature range. Below the scale, there is a continuous Mo5(Si,Al)3 layer that overlies Mo(Si,Al)2 in the bulk. The Mo(Si,Al)2 phase immediately beneath the Mo5(Si,Al)3 layer is depleted in Al. No indications of MoO3 volatilization could be found for the Mo(Si,Al)2 material.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Chalmers University of Technology, 412 96, Göteborg, Sweden

    L. Ingemarsson, K. Hellström, S. Canovic, T. Jonsson, L.-G. Johansson & J.-E. Svensson

  2. Department of Applied Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden

    M. Halvarsson

Authors
  1. L. Ingemarsson
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  2. K. Hellström
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  3. S. Canovic
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  4. T. Jonsson
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  5. M. Halvarsson
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  6. L.-G. Johansson
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  7. J.-E. Svensson
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Correspondence to L. Ingemarsson.

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Ingemarsson, L., Hellström, K., Canovic, S. et al. Oxidation behavior of a Mo(Si,Al)2 composite at 900–1600 °C in dry air. J Mater Sci 48, 1511–1523 (2013). https://doi.org/10.1007/s10853-012-6906-0

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  • DOI: https://doi.org/10.1007/s10853-012-6906-0

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