1 National Elite Institute of Engineering, Zhejiang University, Hangzhou 310027, China 2 Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China 3 Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Ministry of Education), Anhui University of Technology, Ma’anshan 243002, Anhui, China
Abstract: Thermal barrier coatings are mainly used on the surface of high-temperature hot end components such as turbine blades, flame tubes, and transition sections of gas turbines, which can effectively improve the service temperature and extend the service life of hot end components due to excellent thermal insulation performance. With the development of hydrogen fuel gas turbine technology, the corrosion behavior of thermal barrier coatings has received widespread attention under high-temperature water-oxygen environments. In this work, the CoNiCrAlY bond coating was prepared using atmospheric plasma spraying and supersonic flame spraying, and then the YSZ top coating was prepared on the surface of the CoNiCrAlY bond coating using atmospheric plasma spraying. Two kinds of YSZ/CoNiCrAlY thermal barrier coating systems were prepared, and the thermal cycling oxidation behavior of the thermal barrier coating systems from room temperature to 1 100 ℃ and the water-oxygen corrosion behavior at 1 100 ℃ were studied, respectively. The phase structure evolution and microstructure changes of the two kinds of YSZ/CoNiCrAlY thermal barrier coating systems were characterized using XRD and SEM. The results indicate that the CoNiCrAlY bond coating prepared by atmospheric plasma spraying has high porosity and large stress-strain tolerance, which prolongs the thermal cycling oxidation life of YSZ/CoNiCrAlY thermal barrier coating system. YSZ did not undergo phase transformation at 1 100 ℃ under water-oxygen corrosion environment, and both YSZ/CoNiCrAlY thermal barrier coating systems did not peel off after 200 h, demonstrating good resistance to water-oxygen corrosion.
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2025, Vol. 39 
