4.7 Article

Long-time ablation behavior of the multilayer alternating CVD-(SiC/HfC)3 coating for carbon/carbon composites

期刊

CORROSION SCIENCE
卷 189, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109586

关键词

C; C composites; Multi-layer alternating coating; SiC; HfC; LPCVD; Ablation resistance

资金

  1. National Natural Science Foundation of China [91860118, 51727804, 91860203]

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The SiC/HfC coating with multi-layer alternating structure prepared on C/C composites by LPCVD showed improved ablation resistance under ultra-high temperature environments, attributed to the formation of Hf-Si-O sticky glass phase and the multi-layer structure.
To improve the service life of carbon/carbon (C/C) composites under ultra-high temperature ablation environments (> 2200 degrees C), SiC/HfC coating with multi-layer alternating structure was designed and prepared on C/C composites by low-pressure chemical vapor deposition (LPCVD). The microstructure and phase compositions of the as-prepared and ablated coatings were investigated, and the influence of the multi-layer structure on the ablation behavior and thermal stress distribution of the coatings were analyzed as well. After ablation for 120 s, the (SiC/HfC)3 coating has better ablation resistance due to its multi-layer structure and the formation of Hf-Si-O sticky glass phase.

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