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Effect of Al addition on the microstructure and low-temperature reactivity to oxygen of pre-formed MoSi2

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Abstract

The effect of aluminum addition on the structural and low-temperature oxidation behavior of commercially available MoSi2 was investigated by means of X-ray diffraction and thermogravimetric analysis. MoSi2 + x Al compounds (with x = 0.0, 0.10, 0.20, 0.30, and 0.40) were mechanically processed for 6 h starting from α-MoSi2 and Al powders. It is shown that Al can substitute Si atoms in pre-formed MoSi2 leading to the formation of β-MoSi2 (the high temperature phase). The unit cell volume of β-MoSi2 increases linearly with the Al content. For x < 0.20, a clear onset temperature for the oxidation of MoSi2 is discernable at ca. 420 °C, while it is barely noticeable for x ≥ 0.20. The normalized mass gain decreases from ~12 % m−2 to less than 2 % m−2 when the Al content varies from 0.0 to 0.2. For x ≥ 0.20, the normalized mass gain stays constant at less than 2 % m−2.

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Acknowledgements

The authors would like to thank the Natural Science and Engineering Research Council (NSERC) of Canada (Strategic Grant) and the Canada Research Chair program for their financial support.

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Authors and Affiliations

  1. INRS- Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, QC, J3X 1S2, Canada

    Lynda Meddar, Benoît Magnien, Marlène Clisson, Lionel Roue & Daniel Guay

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  1. Lynda Meddar
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  2. Benoît Magnien
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  3. Marlène Clisson
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  4. Lionel Roue
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  5. Daniel Guay
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Correspondence to Daniel Guay.

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Meddar, L., Magnien, B., Clisson, M. et al. Effect of Al addition on the microstructure and low-temperature reactivity to oxygen of pre-formed MoSi2 . J Mater Sci 47, 6792–6800 (2012). https://doi.org/10.1007/s10853-012-6623-8

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  • DOI: https://doi.org/10.1007/s10853-012-6623-8

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