Influence of CO<SUB>2</SUB> on Oxidation Behaviour of TiAl at High Temperatures

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  • Taniguchi Shigeji
    Department of Materials Science and Processing, Graduate School of Engineering, Osaka University
  • Hongawara Narihito
    Department of Materials Science and Processing, Graduate School of Engineering, Osaka University
  • Shibata Toshio
    Department of Materials Science and Processing, Graduate School of Engineering, Osaka University

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  • TiAlの高温酸化挙動に及ぼすCO<SUB>2</SUB>の影響
  • TiAlの高温酸化挙動に及ぼすCO2の影響
  • TiAl ノ コウオン サンカ キョドウ ニ オヨボス CO2 ノ エイキョウ

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The oxidation behaviour of TiAl (36.5 mass%Al) has been studied at 1100 K and 1200 K for 100 ks in a flow of O2, O2-CO2 mixtures or CO2 under atmospheric pressure. The structure of the scales formed in pure O2 atmosphere is very similar to that reported in the literature. The mass gain due to the oxidation significantly increases with increasing partial pressure of CO2 in the O2-CO2 gas mixtures. However, the mass gain in 100%CO2 is about a half of that in O2-90%CO2 at 1200 K. The oxidation enhanced by the addition of CO2 is attributable to (1) the provisional formation of TiC particles, which disturb the continuity of the initially formed Al2O3 scale and (2) the formation of a very porous layer in the thick scale next to the substrate by TiC particles enriched there, which prevent the sintering of oxide grains.

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