Abstract
Molten deposits based on calcium-magnesium alumino-silicates (CMAS), originating from siliceous debris ingested with the intake air, represent a fundamental threat to progress in gas turbine technology by limiting the operating surface temperature of coated components. The thermomechanical and thermochemical aspects of the CMAS interactions with thermal-barrier coatings, as well as the current status of mitigating strategies, are discussed in this article. Key challenges and research needs for developing adequate solutions are highlighted.
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Acknowledgments
This article draws on lessons from research supported by the Office of Naval Research (CGL) and the French Defense Research Organization (MHVS). The authors are indebted to Dr. M.J. Maloney (PWA) for use of the illustration in Figure 2, as well as to Drs. O. Lavigne (ONERA), D. Konitzer, and D. Lipkin (GE) and Professors N.P. Padture (Brown) and M.R. Begley (UCSB) for helpful discussions. The contributions of Drs. R.W. Jackson and S. Krämer at UCSB are gratefully acknowledged.
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Levi, C.G., Hutchinson, J.W., Vidal-Sétif, M.H. et al. Environmental degradation of thermal-barrier coatings by molten deposits. MRS Bulletin 37, 932–941 (2012). https://doi.org/10.1557/mrs.2012.230
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DOI: https://doi.org/10.1557/mrs.2012.230