期刊
CERAMICS INTERNATIONAL
卷 46, 期 3, 页码 3927-3934出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.10.121
关键词
SiBCN; HfC; Ablation properties; Ablation mechanism
资金
- National Key Research and Development Project [2017YFB0310600]
- National Natural Science Foundation of China [51471182, 51602325]
- Shanghai international science and Technology Cooperation Fund [17520711700, 18520744200]
- Youth Innovation Promotion Association (CAS) [2018289]
- Science Foundation for Youth Scholar of State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics CAS [SKL201602]
To improve ablation resistance of SiBCN ceramics, an ultra-high temperature ceramics (UHTCs) phase of HfC was introduced into SiBCN ceramics via high-energy ball milling and hot press sintering methods. The micro-structures, phase compositions, ablation properties and mechanism of SiBCN/HfC composites under a plasma flame ablation environment were investigated. The composite exhibited excellent ablation resistance under a heat flux density of 4.02 MW/m(2) for 60 s. The mass ablation rate of the SiBCN/HfC composite is evaluated to be 2.3 x 10(-5) mg/mm(2).s, which is an order of magnitude lower than that of SiBCN-based ceramics. The result showed that the introduction of HfC provided a skeleton support structure for the oxide layer that can significantly improve the ablation resistance. Furthermore, HfO2 that originated from the oxidation of HfC can serve as the skeleton for reducing the fluidity of the continuous SiO2 glass protective layer. It also suggests that HfC can be an optional addition to improve the ablation properties of the SiBCN ceramic.
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