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Oxidation behavior of TiAl coated with a fine-grain Co-30Cr-4Al film

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Abstract

The oxidation behavior of TiAl coupons coated with a fine-grain Co-30Cr-4Al (mass %) film of about 30-μm thickness has been studied at 1100–1400 K in a flow of purified oxygen at atmospheric pressure for up to 500 ks. Three oxidation stages were recognized: initial transient, parabolic, and accelerated stages. However, at 1100 K a parabolic stage continues for more than 800 ks. The activation energy for parabolic oxidation agrees with reported values for the oxidation of alumina-former alloys, although the mass gains during the parabolic stages are relatively small at 1200 and 1300 K. Micropores developed mainly at the scale/coating and coating/substrate interfaces as oxidation proceeded. This is attributable to recrystallization of the coating during oxidation and a Kirkendall effect due to preferential diffusion of Co into the substrate. The accelerated oxidation can be explained in terms of the formation of rutile mounds on the scale.

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Authors and Affiliations

  1. Department of Materials Science and Processing, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565, Osaka, Japan

    Shigeji Taniguchi & Toshio Shibata

  2. Graduate School of Engineering, Osaka University, Japan

    Naoyuki Asanuma

  3. Corrosion Science Laboratory, Institute of Corrosion and Protection of Metals, The Chinese Academy of Sciences, Wencui Road 62, 110015, Shenyang, China

    Hanyi Lou, Fuhui Wang & Weitao Wu

Authors
  1. Shigeji Taniguchi
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  2. Toshio Shibata
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  3. Naoyuki Asanuma
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  4. Hanyi Lou
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  5. Fuhui Wang
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  6. Weitao Wu
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Taniguchi, S., Shibata, T., Asanuma, N. et al. Oxidation behavior of TiAl coated with a fine-grain Co-30Cr-4Al film. Oxid Met 39, 457–473 (1993). https://doi.org/10.1007/BF00664666

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  • DOI: https://doi.org/10.1007/BF00664666

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