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Failure Mechanisms and Life Prediction of Thermal and Environmental Barrier Coatings under Thermal Gradients

Author
Ghosn, Louis J.
Published
January 30, 2008.
Physical Description
1 electronic document
Additional Creators
Zju, Dongming and Miller, Robert A.
Online Version

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Summary
Ceramic thermal and environmental barrier coatings (TEBCs) will play an increasingly important role in gas turbine engines because of their ability to further raise engine temperatures. However, the issue of coating durability is of major concern under high-heat-flux conditions. In particular, the accelerated coating delamination crack growth under the engine high heat-flux conditions is not well understood. In this paper, a laser heat flux technique is used to investigate the coating delamination crack propagation under realistic temperature-stress gradients and thermal cyclic conditions. The coating delamination mechanisms are investigated under various thermal loading conditions, and are correlated with coating dynamic fatigue, sintering and interfacial adhesion test results. A coating life prediction framework may be realized by examining the crack initiation and propagation driving forces for coating failure under high-heat-flux test conditions.
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Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20080047727.
E-16790.
32nd International Conference on Advanced Ceramics and Composites; 27 Jan. - 1 Feb. 2008; Daytona Beach, FL; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15998431