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The spalling modes and degradation mechanism of ZrO2-8 wt.% Y2O3/CVD-Al2O3/Ni-22Cr-10Al-1Y thermal-barrier coatings

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Abstract

State-of-the-art conventional thermal-barrier coatings consist of a thermalinsulating, partially-stabilized ZrO2 top coat and a bond coat. In this study, a continuous alumina-diffusion-barrier layer was deposited and interposed between the top coat and bond coat by chemical-vapor deposition (CVD). Both the conventional and the experimental TBC systems were cyclically tested at 1000°C, 1050°C, 1100°C, and 1150°C to evaluate and compare oxidation, performance, and fracture behavior. Introduction of the intermediate CVD-Al2O3 layer effectively suppressed the oxidation rate of the bond coat and sufficiently altered its oxidation behavior. The thermal-cyclic life of TBCs was improved by the new system. The failure of the ZrO2-8 wt.% Y2O3/CVD-Al2O3/Ni-22Cr-10Al-1Y TBC specimens was observed to propagate mainly along the lamellar splats of the top coat, and secondarily along the top coat/CVD-Al2O3 interface.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of China

    J. H. Sun & E. Chang

  2. Aero Engine Factory/Aero Industry Development Center, Kang-Shan, Taiwan, Republic of China

    C. H. Chao & M. J. Cheng

Authors
  1. J. H. Sun
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  2. E. Chang
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  3. C. H. Chao
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  4. M. J. Cheng
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Sun, J.H., Chang, E., Chao, C.H. et al. The spalling modes and degradation mechanism of ZrO2-8 wt.% Y2O3/CVD-Al2O3/Ni-22Cr-10Al-1Y thermal-barrier coatings. Oxid Met 40, 465–481 (1993). https://doi.org/10.1007/BF00666387

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  • DOI: https://doi.org/10.1007/BF00666387

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