Invited speaker
Prof. Weize Wang
School of Mechanical and Power Engineering, East China University of Science and Technology
E-mail: wangwz@ecust.edu.cn
Title: Development and Performance Testing of Environmental Barrier Coatings for Silicon Carbide Ceramic Matrix Composites
Profile:
Weize Wang, Professor at the School of Mechanical and Power Engineering, East China University of Science and Technology, has long been engaged in materials surface processing technology and structural integrity evaluation. She has presided over or completed more than 50 projects, including national key R&D program subjects, provincial and ministerial projects, and enterprise cooperation projects. She developed an intelligent failure analysis system, providing technical support for the safe operation and life prediction of high-temperature equipment; established design strategies for surface/interface composition and microstructure to improve the performance of existing surface/interface. She has published more than 200 papers and authorized or applied for dozens of invention patents.
Abstract:
Silicon carbide ceramic matrix composites (SiC/SiC CMCs) exhibit low density and excellent high-temperature thermomechanical properties, but they are susceptible to corrosion by high-temperature water vapor generated from gas combustion, leading to rapid surface degradation and significant strength decline. This study focuses on improving the performance of environmental barrier coating (EBC) systems. Through first-principles calculations, thermodynamic property tests, a rapid screening method for high-entropy rare-earth disilicate materials, and high-temperature CMAS corrosion tests, a low thermal conductivity high-entropy (Sc0.2Y0.2Er0.2Yb0.2Lu0.2)2Si2O7 (5RESO) EBC material was developed. Compared with traditional EBC materials, this material has comparable thermal expansion coefficient, lower thermal conductivity, and enhanced CMAS corrosion resistance. Using this material as the top coat, the water vapor corrosion resistance of the coating system has been significantly improved compared to SiC/SiC CMCs.