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Three-Dimensional Characterization of Cracks in a Columnar Thermal Barrier Coating System for Gas Turbine Applications

  • Thematic Section: 3D Materials Science
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Abstract

Thermal barrier coatings (TBC) are multilayered systems comprising a metallic oxidation protection layer or so-called bond coat, a ceramic topcoat, and a thermally grown aluminum oxide developing at the interface. The coating systems fail typically by delamination cracking near this interface, which has a complex three-dimensional morphology influencing the crack path. This study combines laser shock adhesion test to introduce an artificial interfacial crack, known in size and location, and focused ion beam coupled with scanning electron microscopy 3D serial sectioning tomography. Methods for proper segmentation of cracks and adjacent materials and quantitative evaluation of the complex crack system are proposed and applied for analyzing the crack tip region. Finally, derived from the three-dimensional segmentation, a finite element model has been achieved and used for thermal analysis highlighting the crucial role of local damage on thermal conductivity of the TBC.

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Acknowledgements

Part of this work was carried out within the MATMECA consortium and supported by the ANR under contract number ANR-10-EQUIPEX-37 14. Additionally, we acknowledge funding by the German Science Foundation under contract SFB TRR 103, project A3. A.D. thanks the Zuse Institute Berlin (ZIB) for access to the AVIZO software and for fruitful discussions.

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Authors and Affiliations

  1. MAT - Centre des Materiaux, CNRS UMR 7633, MINES ParisTech, PSL Research University, BP87, 91003, Evry, France

    Anne Dennstedt, Fabrice Gaslain, Vincent Guipont & Vincent Maurel

  2. Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Werkstoff-Forschung, Linder Höhe, 51147, Cologne, Germany

    Anne Dennstedt & Marion Bartsch

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  1. Anne Dennstedt
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  2. Fabrice Gaslain
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  3. Marion Bartsch
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  4. Vincent Guipont
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  5. Vincent Maurel
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Correspondence to Vincent Maurel.

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Dennstedt, A., Gaslain, F., Bartsch, M. et al. Three-Dimensional Characterization of Cracks in a Columnar Thermal Barrier Coating System for Gas Turbine Applications. Integr Mater Manuf Innov 8, 400–412 (2019). https://doi.org/10.1007/s40192-019-00150-7

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  • DOI: https://doi.org/10.1007/s40192-019-00150-7

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