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Thermodynamic aspects of TiAl and TiSi2 oxidation: The Al-Ti-O and Si-Ti-O Phase diagrams

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Abstract

Thermodynamic data from the literature were used to calculate the activity variations of Ti and Al in the Ti-Al system at 700, 900, and 1100°C and of Ti and Si in the Ti-Si system at 800, 1000, and 1300°C. The activity data were then applied to estimate the stable oxide phase in equilibrium with the metal phase, assuming that the activity of the oxide phase was unity. It was found that in the Ti-Al-O system the stable oxide changed from TiO to Al 2O3 in the existence region of the TiAl phase, while in the Ti-Si-O system a comparable change from Ti-oxide to SiO 2 occurred in the existence region of the Ti 5Si3 phase. The significance of these results to the oxidation of intermetallics in the Ti-Al and Ti-Si systems is discussed briefly.

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Authors and Affiliations

  1. Dechema-Institut, P.O. Box 97 01 46, D-6000, Frankfurt am Main 97, F.R.G.

    A. Rahmel

  2. Lehrstuhl für Theoretische Hüttenkunde und Metallurgie der Kernbrennstoffe, RWTH Aachen, Kopernikusstraße 16, D-5100, Aachen, F.R.G.

    P. J. Spencer

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  1. A. Rahmel
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  2. P. J. Spencer
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Rahmel, A., Spencer, P.J. Thermodynamic aspects of TiAl and TiSi2 oxidation: The Al-Ti-O and Si-Ti-O Phase diagrams. Oxid Met 35, 53–68 (1991). https://doi.org/10.1007/BF00666500

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  • DOI: https://doi.org/10.1007/BF00666500

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