The Role Of Thermally Grown Oxide In The Failure Thermal Barrier Coatings For Gas Turbine Engine Applications
Thermal barrier coatings (TBCs) are widely used in gas turbine engines for propulsion and power generation to maximize engine operating temperature and fuel efficiency. TBCs comprise primarily three major components: the ceramic top coat, the intermetallic bond coat and a thin layer of a thermally g...
Main Authors: | , , |
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Format: | Conference Object |
Language: | English |
Published: |
Zenodo
2018
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Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.1345000 https://zenodo.org/record/1345000 |
Summary: | Thermal barrier coatings (TBCs) are widely used in gas turbine engines for propulsion and power generation to maximize engine operating temperature and fuel efficiency. TBCs comprise primarily three major components: the ceramic top coat, the intermetallic bond coat and a thin layer of a thermally grown oxide (TGO) formed at the bond coat/top coat interface. It was demonstrated that the TGO layer plays a critical role in determining the TBC life time with many TBC failure events occurring with its direct involvement. However, the actual mechanisms that govern TBC degradation and failure are still not fully understood in terms of the TGO role and the effects of its properties on the failure process. Stress analysis and TBC life time modelling were used in this study to demonstrate that the TGO morphology, its specific mechanical and thermal properties significantly affect the degradation modes and failure behaviour of the entire TBC system while the particular failure mechanisms differ depending on the ceramic top coat fabrication process. In this paper, the effect of changes in the TGO layer during thermal cycling has been theoretically investigated for TBC with top coats fabricated by atmospheric plasma spray and electron be am physical vapour deposition and the differences in their degradation and failure have been discussed. : {"references": ["Ahrens M., Va\u03b2en R., and St\u00f6ver D. (2002). Stress distributions in plasma - sprayed thermal barrier coatings as a function of interface roughness and oxide scale thickness. Surface and Coatings Technology 161 (1), 26 - 35.", "Beele W., Marijnissen G., and van Lieshout A. (1999). 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