Estimation of spallation life of thermal barrier coating of gas turbine blade by thermal fatigue test

Plasma-sprayed thermal barrier coatings (TBCs) are applied to protect the blades of a gas turbine system from high-temperature gas and to lower the surface temperature of the blades. The failure of TBC is directly connected to the failure of the blades because the spallation of a ceramic layer leads...

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Bibliographic Details
Published in:Surface & coatings technology 2011-07, Vol.205, p.S157-S160
Main Authors: Shin, In-Hwan, Koo, Jae-Mean, Seok, Chang-Sung, Yang, Sung-Ho, Lee, Tack-Woon, Kim, Bum-Soo
Format: Article
Language:English
Subjects:
Applied sciences
Blades
Cross-disciplinary physics: materials science
rheology
Delaminated area
Delaminating
Delamination life
Exact sciences and technology
Fatigue failure
Gas turbine engines
Gas turbines
Materials science
Metals. Metallurgy
Nonmetallic coatings
Physics
Production techniques
Spallation
Surface treatment
Surface treatments
Thermal barrier coating (TBC)
Thermal barrier coatings
Thermal fatigue
Thermally grown oxide (TGO)
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Summary:Plasma-sprayed thermal barrier coatings (TBCs) are applied to protect the blades of a gas turbine system from high-temperature gas and to lower the surface temperature of the blades. The failure of TBC is directly connected to the failure of the blades because the spallation of a ceramic layer leads to the acceleration of local corrosion and oxidation at the location of failure. Therefore, the spallation life of TBC is very important in the evaluation of the reliability of a gas-turbine blade. In this study, thermal fatigue tests were performed at 1100°C and 1151°C. Then, c-scanning and bond strength tests were performed for TBC specimens that were thermally aged by thermal fatigue tests. From the results, an empirical equation based on the ratio of the delamination area and the thermal cycle number was presented and the spallation life of a TBC specimen could be roughly estimated using the relationship between the delaminated area and the number of cycles.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2011.02.068