Microstructure evolution and oxidation behavior of SiC-HfB2-MoSi2 coating prepared by gaseous/liquid silicon infiltration

Jiaping Zhang, Xiaoxuan Su, Chenglong Tan, Jiaqi Hou, Shubo Zhang, Qiangang Fu

科研成果: 期刊稿件文章同行评审

摘要

Targeting the issue of C/C composites easily oxidizing at elevated temperatures, SiC-HfB2-MoSi2 coating was prepared on C/C-SiC-HfB2 composites. This paper presents a comparative study of the microstructure and oxidation resistance of the coating prepared by gaseous infiltration silicon (GSI) and liquid infiltration silicon (LSI), respectively. The silicon infiltration process was simulated to assist in analyzing the morphology changes of the coating. The GSI coating is denser and more uniform than the LSI coating, whose bottom coating is thin and defective. These morphological differences are mainly due to the rearrangement of the ceramics in the coating with the flow of Si. The GSI coating protected the matrix for 78 h at 1700 °C with a mass loss of only 1.67 %, demonstrating good oxidation resistance, while the LSI coating lost 3.19 % of its mass after oxidation for 34 h. The primary reason for the discrepancy is that the GSI coating has a more homogeneous, dense structure than the LSI coating, providing a better oxygen barrier. This work provided a technical reference for the stable service of C/C composites in a high-temperature aerobic environment.

源语言英语
文章编号131656
期刊Surface and Coatings Technology
496
DOI
出版状态已出版 - 15 1月 2025

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