Improving the Corrosion Resistance of Thermal Barrier Coatings against CMAS by Depositing top ceramic layer of Enhanced Splat Bonding

Monday, May 11, 2015: 3:30 PM
Room 102A (Long Beach Convention and Entertainment Center)
Mr. Tao Liu , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Dr. Xiao-Tao Luo , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
The corrosion resistance of the ceramic coatings against CMAS deposit at high temperature is significantly affected by the microstructure of the coatings. Enhancing the bonding ratio between the splats in coatings significantly reduces the inter-connected pores and then obstructs the penetration of the CMAS. In this study, La2Zr2O7 coatings with different lamellar bonding ratios were deposited by changing deposition temperature. The microstructure and properties of the La2Zr2O7 coatings with CMAS deposited on after thermal exposure at 1250°C for different durations were characterized. It was clearly revealed that by adjusting the microstructure and designing a ceramic layer with high bonding ratio on the top of the conventional ceramic layer, the corrosion resistance of the thermal barrier coating could be enhanced. Moreover, by designing multilayer-structured TBCs composed of a porous layer and well-bonded layer, the TBCs with high CMAS corrosion resistance and low thermal conductivity can be achieved.
See more of: Thermal Barrier Coatings (TBCs)
See more of: Advanced Coatings for the Aerospace Industry