期刊
CERAMICS INTERNATIONAL
卷 47, 期 2, 页码 1903-1916出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.09.019
关键词
Graphite; Hf0.8Ti0.2B2 solid Solution; Oxidation; Ablation; Multiphase composite coating
资金
- National Natural Science Foundation of China [51973124]
- National Key R&D Program Science and Technology Winter Olympics [2019YFF0302004]
- SinoSpanish Advanced Materials Institute, Shenyang Municipal Science and Technology Bureau [18-005-6-04]
- Department of Science & Technology of Liaoning province Shenyang National Laboratory for Materials Science Joint RD Fund Project [2019JH3/30100015]
- Liaoning BaiQianWan Talents Program [[2020] 78]
The novel multiphase composite coating composed of Hf0.8Ti0.2B2 solid solution, SiC and Si showed excellent oxidation and ablation resistance at high temperatures. The high viscosity oxide layer and dense structure of the coating improved high temperature stability, while the refractory oxide layer on the surface acted as an oxygen barrier to protect the graphite matrix from further consumption.
A novel multiphase composite coating composed of Hf0.8Ti0.2B2 solid solution, SiC and Si was prepared by a joint procedure of slurry method and silicon reactive infiltration (SRI). The oxidation and ablation experiments were conducted to investigate oxidation and ablation resistance of the Hf0.8Ti0.2B2-SiC-Si coated graphite samples, respectively. The results revealed that the coated sample was oxidized at 1823 K for 108 h with a mass gain of 1.49%, which was ascribed to the high viscosity oxide layer improved by HfSiO4 and TiO2 in conjunction with dense structure of the coating, thereby presenting excellent high temperature stability. Furthermore, after 90 s ablation at 3273 K under a heat flux of 5.62 MW/m(2), the composite coating was not peeled off, which had mass ablation rate (MAR) and linear ablation rate (LAR) of 3.1 mg/s and 1.5 mu m/s, respectively. The refractory oxide layer comprising oxides of Hf and Ti on the surface acted as an oxygen barrier, which can weaken the mechanical erosion force of oxyacetylene flame, finally protecting the inner coating and graphite matrix from further consumption.
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