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Oxidation Behavior of Tribaloy T-800 Alloy at 800 and 1,000 °C

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Abstract

The oxidation behavior of Co-based Tribaloy T-800 alloy has been studied isothermally in air at 800 and 1,000 °C, respectively. The results showed that the oxidation mechanism was dependent on the exposure temperature. The oxidation of the alloy followed subparabolic oxidation kinetics at 800 °C. The oxide scale at this temperature exhibited a multi-layered structure including an outer layer of Co oxide, a layer composed of complex oxide and spinel, a nonuniform Mo-rich oxide layer, an intermediate mixed oxides layer and an internal attacked layer with different protrusions into Laves phase. During 1,000 °C exposure, it followed linear kinetics. The oxidation rendered a relatively uniform external Cr-rich oxide layer coupled with a thin layer of spinel on the top surface and voids at local scale/alloy interface and intergranular region together with internal Si oxide at 1,000 °C.

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Notes

  1. Tribaloy is a registered trademark of Deloro Stellite (USA).

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Acknowledgement

The authors gratefully acknowledge the support of Mitsubishi Heavy Industries (MHI) of Japan.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Y.-D. Zhang, Z.-G. Yang, C. Zhang & H. Lan

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  1. Y.-D. Zhang
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  2. Z.-G. Yang
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  3. C. Zhang
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  4. H. Lan
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Correspondence to Z.-G. Yang.

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Zhang, YD., Yang, ZG., Zhang, C. et al. Oxidation Behavior of Tribaloy T-800 Alloy at 800 and 1,000 °C. Oxid Met 70, 229–239 (2008). https://doi.org/10.1007/s11085-008-9117-y

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  • DOI: https://doi.org/10.1007/s11085-008-9117-y

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