原位反应法制备SiC-HfB2-Si三元涂层及其组织演变与超高温腐蚀行为研究-抗高温氧化烧蚀

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• 张 博士
• 西北工业大学
• 2021年6月4日  星期五
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原位反应法制备SiC-HfB2-Si三元涂层及其组织演变与超高温腐蚀行为研究

原位反应法制备SiC-HfB2-Si三元涂层及其组织演变与超高温腐蚀行为研究
Journal of the European Ceramic Society
Available online 29 May 2021
Microstructure evolution of in-situ SiC-HfB2-Si ternary coating and its corrosion behaviors at ultra-high temperatures

PeiZhang，QiangangFu，ChunyuCheng，JiaSun，JiapingZhang，MinXu，XiaofeiZhu


Shaanxi Key Laboratory of Fiber Reinforced Light-Weight Composites, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, PR China
Received 28 January 2021, Revised 25 May 2021, Accepted 27 May 2021, Available online 29 May 2021.
https://doi.org/10.1016/j.jeurceramsoc.2021.05.058
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Highlights
?SiC-HfB2-Si ternary coating was made via slurry panting plus gaseous Si infiltration.
?The as-prepared coating exhibited obvious dense and multi-phase mosaic structure.
?The coating prevented C/C substrate against oxidation at 1773 K for more than 1507 h.
?The linear, mass erosion rates up to 2392 K for 60 s were -0.72 μm/s, 0.07 mg/s.


Abstract
An in-situ SiC-HfB2-Si ternary coating was deposited on C/C composites (C/Cs) via slurry panting plus gaseous Si infiltration composite method, to improve the oxidation and ablation resistance of C/Cs above 1773 K. The coating formation mechanism was investigated by microstructural analyses and thermo-dynamic calculations. The oxidation behavior of the coated specimens subjected either to high-temperature testing at 1773 K and 1973 K in static air furnace or to ablation testing with oxyacetylene torch upon ultra-high temperature service were studied, base on thermo-dynamic computations, numerical simulations and microstructure evolution. The SiC-HfB2-Si coating protected C/Cs against oxidation at 1773 K for more than 1507 h which is longer than that of the reported SiC-HfB2-based coatings, due to the as-prepared compact mosaic coating filled with HfB2-rich Si-based multiphase and the consequently formed dense Hf-Si-O oxide layer. Moreover, a good ablation resistance with relatively low linear and mass ablation rates of ?0.72 μm/s and 0.07 mg/s, respectively, was achieved due to the stable oxide scale with high viscosity.


Keywords
Carbon/carbon composites，Gaseous Si infiltration，SiC-HfB2-Si ternary coating，Oxidation，Ablation




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