(1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) (2. Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai 200050, China) (3. Metallurgical Engineering College, Anhui University of Technology, Maanshan 243002, China)
It is an ideal way to improve the performance of composite antioxidant by plasma spraying ZrB2-based ceramic coatings on C/C composite. To effectively prevent the formation of hot crack and design the materials with better performance, through the reasonable modeling, numerical simulation was used to forecast the size and distribution of macroscopic residual stress of the coating caused by thermal mismatch during the spray deposition by employing indirect sequence thermalstructure coupling. The effect of ZrB2-SiC ceramic coating thickness，SiC bond coating thickness and material composition on residual thermal stress was comparatively analyzed. The results showed that radial stress was the major form of residual stress. Thicker bonding layer could effectively alleviate the difference of thermal properties of materials. When the thickness of the coating was 0.5 mm, it could ensure that the residual stress at the interface of the coating surface wouldnt be small when it was fractured due to pressure. The material of the coating system tended to be ZrB2-30vol% SiC material with higher thermal conductivity and lower thermal expansion coefficient, which could ensure that the coating wouldn‘t warp due to too much tensile stress at the edge.