Journal of Inorganic Materials

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Effect of SiC Transition Layer on Bonding Properties of MoSi2-SABB Coating on SiC/SiC Ceramic Matrix Composites

CAO Luhan1,2, MENG Jia1, XUE Yudong3,4, SHENG Xiaochen1, CUI Yuanyuan5, LE Jun1, SONG Lixin1,2   

  1. 1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), Shanghai 200050, China;
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences,Beijing 100049, China;
    3. State Key Laboratory of High-Performance Ceramics & Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    4. Structural Ceramics and Composites Engineering Research Centre, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    5. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
  • Received:2024-12-26 Revised:2025-03-15
  • About author:CAO Luhan (2000-), female, Master candidate. E-mail: caoluhan22@mails.ucas.ac.cn

Abstract: SiC/SiC ceramic matrix composites (SiC/SiC CMCs) are expected to be used in the thermal protection system of reusable aerospace vehicles due to their advantages of high temperature resistance, low density, and high strength. Given the complex and harsh working environment of aerospace vehicles, it is urgent to develop a high-temperature anti-oxidation sealing coating on the surface of SiC/SiC ceramic matrix composites to meet the requirements for reusability. Since the rough and anisotropic surface of SiC/SiC ceramic matrix composites can easily induce coating cracking and failure, the design of the sealing coating and the optimization of the coating's bonding performance need to be further studied. In this work, a SiC transition layer was designed and prepared on the surface of SiC/SiC ceramic matrix composites by chemical vapor deposition, which solved the cracking and spalling problems of the MoSi2-doped SiO2-Al2O3-BaO-B2O3 glass-ceramic composite coating (MoSi2-SABB), and enabled the coating to exhibit excellent thermal shock resistance. Finite element analysis showed that the SiC transition layer could effectively reduce the residual stress at the interface between the MoSi2-SABB coating and the substrate, alleviate the anisotropy of the residual stress, and significantly improve the bonding performance of the coating. The binding mechanism of SiC transition layer with different crystal structures and polarities and MoSi2-SABB coating was investigated by first principles calculation. The results showed that the crystal structure and polarity of SiC transition layer were the key factors affecting the coating bonding performance, providing a basis for the design and optimization of the bonding performance of the surface sealing coating of SiC/SiC ceramic matrix composites.

Key words: SiC/SiC ceramic matrix composites, SiC transition layer, glass-ceramic composite coating, bonding performance

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