自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 9    September 2020

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Ablation resistance and mechanism of SiC/ZrC-ZrB2 double layer coating for C/C composites under plasma flame
LIU Han-zhou(刘汉周)1, YANG Xin(杨鑫)1, 2, FANG Cun-qian(方存谦)1, SHI An-hong(石安红)1, CHEN Lei(陈蕾)1, HUANG Qi-zhong(黄启忠)1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

Abstract:To improve the ablation resistance of carbon/carbon (C/C) composites, a SiC/ZrC-ZrB2 double layer coating was fabricated by pack cementation and slurry-sintering method. The ablation resistance of the SiC/ZrC-ZrB2 coating was tested under plasma flame above 2300 °C. The results indicate that the SiC/ZrC-ZrB2 double layer coating exhibits superior ablation resistance than the ZrC-ZrB2 single layer coating. After being ablated under the plasma flame for 20 s, the mass and linear ablation rates of the ZrC-ZrB2 coating are 0.89 mg/s and 15.3 μm/s, while those for SiC/ZrC-ZrB2 coating are 0.09 mg/s and 24.15 μm/s, respectively. During ablation, the SiC inner layer can generate SiO2 glass and result in the formation of ZrO2-SiO2 molten film. Compared with the ZrO2 molten film formed on the ZrC-ZrB2 coating surface, the ZrO2-SiO2 molten film with lower oxygen diffusion rate and viscosity enables the SiC/ZrC-ZrB2 coating to have better self-healing ability. Therefore, the enhanced ablation resistance of the SiC/ZrC-ZrB2 coating can be attributed to the formation of dense ZrO2-SiO2 molten film under the plasma flame.

 

Key words: ablation; pack cementation; slurry; SiC/ZrC-ZrB2 coating

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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