Rare-earth Element doped YSZ/YSZ Multilayer Thermal Barrier Coating with High Infrared Reflectivity

oleh: YANG Wei, WANG Yufeng

Format: Article
Diterbitkan: Journal of Aeronautical Materials 2018-10-01

Deskripsi

The operating temperature of advanced aeroturbine engine increases rapidly for higher working efficiency. Thermal barrier coatings (TBCs) with high temperature capability and thermal insulation effect are required. In this work, a novel multilayer TBCs consisting of rare-earth element doped YSZ and YSZ sublayers were designed and fabricated. The influence of microstructure to the phase structure, thermal conductivity and infrared reflectivity of the coatings were investigated. The results show that a preferred orientation of (200) is yielded in the coating. With the increase of layers, the thermal conductivity of the coating decreases and the infrared reflectivity increases respectively. The multilayer coating with 200 sublayers exhibits a thermal conductivity of 1.1-1.16 W/m·K, 11<private-char description="%">%</private-char> lower than that of the conventional single layer coating. The infrared reflectivity of the coating reaches as high as 48<private-char description="%">%</private-char>-55<private-char description="%">%</private-char>.