Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 16-17, Pages 2683-2688Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.02.026
Keywords
Thermal barrier coating; Thermal-gradient cyclic testing; Glass deposits; Failure mechanics
Funding
- U.S. Office of Naval Research [N00014-08-1-0458]
- U.S. Department of Energy [DE-NT0006552]
Ask authors/readers for more resources
Degradation of thermal barrier coatings (TBCs) in gas-turbine engines by molten calcium-magnesium-aluminosilicate (CMAS) glassy deposits is becoming a pressing issue, as engines are required to operate under increasingly harsh conditions. While new approaches for mitigating CMAS attack of TBCs are starting to emerge, there is a need for appropriate tests for evaluating the efficacy of those approaches. To that end, we present here a new thermal-cycling test for the evaluation of TBC performance, where a thermal gradient is applied across the TBC. with simultaneous injection of CMAS. The conditions simulated in this new test are closer to actual conditions in an engine, as compared to the conventional furnace test without thermal gradient. This new test is applied to a TBC with a new composition designed for mitigating CMAS attack, where the mitigation mechanisms are observed to be similar to those found in the conventional furnace test. However, based on a previously established mechanics model it is shown here that thermal-gradient cyclic testing is essential for evaluating thermomechanical performance of TBCs under attack by CMAS, and that the use of just the conventional furnace test can lead to the underestimation of the TBC performance. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available