期刊
CERAMICS INTERNATIONAL
卷 43, 期 15, 页码 12005-12012出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.06.052
关键词
Carbon/carbon composites; HfB2-SiC; Ablation resistance
资金
- National Natural Science Foundation of China [51521061, 51672223]
- 111 project [08040]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [142-TZ-2016, 98-QZ-2014]
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/m(2), the mass ablation rate and linear ablation rate of the coated C/C composites were only 0.147 mg/s and 0.267 pm/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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