Ablation resistance of HfB2-SiC coating prepared by in-situ reaction method for SiC coated C/C composites |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China;2. College of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, PR China;3. Faculty of Engineering, Energy and Sustainability Research Division, University of Nottingham, Nottingham, NG7 2RD, United Kingdom |
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| Abstract: | To improve the ablation resistance of SiC coating, HfB2-SiC coating was prepared on SiC-coated carbon/carbon (C/C) composites by in-situ reaction method. Owing to the penetration of coating powders, there is no clear boundary between SiC coating and HfB2-SiC coating. After oxyacetylene ablation for 60 s at heat flux of 2400 kW/m2, the mass ablation rate and linear ablation rate of the coated C/C composites were only 0.147 mg/s and 0.267 µm/s, reduced by 21.8% and 60.0%, respectively, compared with SiC coated C/C composites. The good ablation resistance was attributed to the formation of multiple Hf-Si-O glassy layer including SiO2, HfO2 and HfSiO4. |
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| Keywords: | Carbon/carbon composites Ablation resistance |
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