Abstract
The effect of the thermally grown oxide (TGO) formation on the lifetime of the thermal barrier coatings (TBC) with MCrAlY-bondcoats (BC) is reviewed. A number of factors affecting the TGO-formation and TBC-failure are discussed including the coating microstructure, geometrical (coating roughness and thickness) and processing parameters. Under given testing conditions for a specific EB-PVD-TBC-system forming a flat, uniform alumina TGO a critical TGO-thickness for TBC-failure can be defined. This TGO-morphology is, however, not necessarily optimum for obtaining long TBC-lifetime, which can be extended by formation of TGO’s with an uneven TGO/BC interface. In contrast, APS-TBC-systems are prone to formation of intrinsically inhomogeneous TGO-morphologies. This is attributed to non-uniform depletion of Y and Al underneath rough MCrAlY-surfaces as well as due to the commonly observed repeated-cracking/re-growth of the TGO during temperature cycling. The latter phenomenon depends on the exposure temperature and the mechanical properties of the APS-TBC. In both types of TBC-systems the TGO-formation and TBC-lifetime appear to be very sensitive to the manufacturing parameters, such as vacuum quality during bondcoat spraying and temperature regime of the bondcoat vacuum heat-treatment.
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Acknowledgements
The authors are grateful to the following colleagues in the Institute for Energy Research of the Forschungszentrum Jülich for assistance in the materials procurement and experimental work: R. Vassen, K·H. Rauwald, H. Cosler, E. Wessel, M. Subanovic, and J. Toscano. Part of the present work was funded by the German Research Foundation (Grant No. NA-615-1) and German federal ministry for economy and technology (Grant No. 0326888D).
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Naumenko, D., Shemet, V., Singheiser, L. et al. Failure mechanisms of thermal barrier coatings on MCrAlY-type bondcoats associated with the formation of the thermally grown oxide. J Mater Sci 44, 1687–1703 (2009). https://doi.org/10.1007/s10853-009-3284-3
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DOI: https://doi.org/10.1007/s10853-009-3284-3