Journal
CORROSION SCIENCE
Volume 189, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109586
Keywords
C; C composites; Multi-layer alternating coating; SiC; HfC; LPCVD; Ablation resistance
Funding
- 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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