Oxidation-Based Model for Thermal Barrier Coating Life |
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Authors: | ROBERT A. MILLER |
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Affiliation: | National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135 |
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Abstract: | A procedure is described for modeling the lives of thermal barrier coatings subjected to high-temperature environments. The model is used to calculate cycles-to-failure as a function of heating cycle duration. It is based on the presumption that oxidation is the single important time-dependent factor which limits the life of these coatings, and that oxidation-induced strains combine with cyclic strains to promote slow crack growth in the ceramic layer. Good agreement is obtained between calculated and experimental lives for specimens tested in a furnace. This shows that an oxidation-based approach is promising. The importance of reproducible specimen preparation is also discussed. |
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