Lifetime Performance of EB-PVD Thermal Barrier Coatings with Coating Thickness in Cyclic Thermal Exposure

서지정보

· 발행기관 : 한국재료학회
· 수록지 정보 : 한국재료학회지 / 25권 / 10호
· 저자명 : Zhe Lu, Seoung Soo, Je-Hyun Lee, Yeon-Gil Jung

목차

1. Introduction
2. Experimental Procedure
2.1 Preparation of TBC specimens
2.2 Characterization
2.3 Thermal fatigue and thermal-shock tests
3. Results and Discussion
3.1 Microstructure of as-prepared TBCs
3.2 Lifetime of TBC systems
3.3 Mechanical properties
4. Conclusions
Acknowledgement
Reference

영어초록

The effects of coating thickness on the delamination and fracture behavior of thermal barrier coating (TBC) systems were investigated with cyclic flame thermal fatigue (FTF) and thermal shock (TS) tests. The top and bond coats of the TBCs were prepared by electron beam-physical vapor deposition and low pressure plasma spray methods, respectively, with a thickness ratio of 2:1 in the top and bond coats. The thicknesses of the top coat were 200 and 500 μm, and those of the bond coat were 100 and 250 μm. FTF tests were performed until 1140 cycles at a surface temperature of 1100 oC for a dwell time of 5 min. TS tests were also done until more than 50 % delamination or 1140 cycles with a dwell time of 60 min. After the FTF for 1140 cycles, the interface microstructures of each TBC exhibited a sound condition without cracking or delamination. In the TS, the TBCs of 200 and 500 μm were fully delaminated (> 50 %) within 171 and 440 cycles, respectively. These results enabled us to control the thickness of TBC systems and to propose an efficient coating in protecting the substrate in cyclic thermal exposure environments.

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