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Assessment of TBC Oxidation-Induced Degradation Using Compression Tests

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Abstract

Compression tests at room temperature are used to estimate the critical strain to spallation of EBPVD thermal barrier coating deposited on Ni based single crystals for blades used in aero-engines. The observation of fracture surfaces allows for investigating the location of delamination events leading to spallation, the eventual porosity at bond coat–alumina interface and kinetics of damage evolution. The effect of isothermal oxidation at 1,100 °C is presented for standard or low sulfur AM1 superalloy, and coating process variants. The degradation is shown to depend on the thermal–mechanical loading and varies from isothermal oxidation, cyclic oxidation and thermal–mechanical fatigue with hold time. These observations are consistent with the damage observed in blades in engine tests or in service. These tests are a useful complement to standard cyclic oxidation tests to identify engineering lifetime models.

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Acknowledgments

The authors are grateful to Safran–Snecma for providing single crystal specimens as well as coating after specimen machining and for financial support of part of this study. They are in particular indebted to Jean-Yves Guédou for his continuous interest in this work. The experimental work was carried out during completion of the theses of C. Guerre and I. Rouzou that were supported by Snecma and the French Ministry of Research (C. Guerre) and the French Ministry of Defense (I. Rouzou) respectively.

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Authors and Affiliations

  1. Centre des Matériaux, Mines ParisTech, CNRS UMR 7633, 10 rue Henri Desbruères, 91003, Evry, France

    L. Rémy, C. Guerre, I. Rouzou & R. Molins

  2. CEA Saclay, 91191, Gif sur Yvette, France

    C. Guerre

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  1. L. Rémy
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  2. C. Guerre
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  3. I. Rouzou
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  4. R. Molins
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Correspondence to L. Rémy.

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Rémy, L., Guerre, C., Rouzou, I. et al. Assessment of TBC Oxidation-Induced Degradation Using Compression Tests. Oxid Met 81, 3–15 (2014). https://doi.org/10.1007/s11085-013-9416-9

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  • DOI: https://doi.org/10.1007/s11085-013-9416-9

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