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A chemomechanical coupling model for stress analysis of oxide scale growing between ceramic coating and substrate

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Abstract

The thermal growth of the oxide scale between the ceramic coating and substrate due to high-temperature oxidation is regarded as the dominating cause for the failure of the ceramic/substrate system, for example the thermal barrier coating. Based on the irreversible evolution equations, the growth strain in the oxide scale is formulated by considering the coupling effects of stress and chemical reaction during isothermal oxidation. A model which accounts for the growth strain, thermal expansion strain, and viscoplastic effect is developed for the stress analysis of the oxide scale. Numerical results reveal that there is a significant gradient in the oxide scale with the maximum compressive stress at the oxide/substrate interface and the minimum compressive stress at the ceramic/oxide interface, and the stress in the oxide scale is larger than those in the ceramic coat and bond coat. The effects of the growth strain, viscoplasticity, chemomechanical coupling, and chemical reaction on the stresses are numerically discussed.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (NSFC Grants No. 11632014 and 11372238) and the Chang Jiang Scholar program.

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Authors and Affiliations

  1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an, 710049, China

    Gongxi Zhang, Hailong Wang & Shengping Shen

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  1. Gongxi Zhang
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  2. Hailong Wang
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  3. Shengping Shen
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Correspondence to Hailong Wang or Shengping Shen.

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Zhang, G., Wang, H. & Shen, S. A chemomechanical coupling model for stress analysis of oxide scale growing between ceramic coating and substrate. Acta Mech 228, 3173–3183 (2017). https://doi.org/10.1007/s00707-017-1887-3

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  • DOI: https://doi.org/10.1007/s00707-017-1887-3

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