Oxygen barrier resistance of HfB2-MoSi2-TaB2 coatings in a wide temperature region |
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| Affiliation: | 1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;2. Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites, Institute of Carbon Matrix Composites, Henan Academy of Sciences, Zhengzhou, 450046, China;1. School of Mechanical and Electrical Engineering, Wuhan Business University, Wuhan, 430058, China;2. Public Health and Management School, Hubei University of Medicine, Shiyan, 442000, China;3. School of Materials Science and Engineering, Hubei Key Laboratory of Energy Storage and Power Battery, Hubei University of Automotive Technology, Shiyan, 442002, China;4. School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning, 437100, China;5. School of Materials Science & Engineering, Hubei University, Wuhan, 430062, China;6. School of Mechanical Electronics Engineering, Wuhan University of Technology, Wuhan, 430081, China;1. College of Materials and Chemistry & Chemical Engineering, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China;2. School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China;3. International Advanced Energy Science Research and Education Center, Graduate School of Energy Science, Kyoto University, Yoshida-Honmachi, Kyoto, 606-8501, Japan;1. Key Laboratory of Advanced Electronic Materials and Devices, Department of Mathematics and Physics, Anhui Jianzhu University, Hefei, 230601, China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China;1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;2. Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou, Henan, 451283, China;3. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510651, China;1. University of Biskra, Laboratory of Molecular Chemistry and Environment, B. P. 145, 07000, Biskra, Algeria;2. Research Center in Semiconductor Technology for Energetic, CMSI Division, CRTSE, 2 Bd Frantz Fanon, PB 140, 7M, Algiers, Algeria |
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| Abstract: | HfB2-MoSi2-based ultra-high temperature ceramic (UHTC) coatings have shown remarkable antioxidant effects owing to the formation of silicate glass layers with low oxygen permeability in high-temperature environments, which shows great potential in the antioxidation of carbon structural materials. To further enhance the oxidation resistance of the HfB2-MoSi2-based coating in a wide temperature region, the influence of volume ratio between HfB2 and TaB2 on the antioxidant capacity of the HfB2-MoSi2-TaB2 coatings was investigated. The addition of 15 vol% TaB2 in the 60HfB2-40MoSi2 coating delays the initial oxidation temperature of the 60HfB2-40MoSi2 sample from 300 °C to 500 °C, which decreased the oxidation loss by 75.85% during dynamic oxidation. In oxidation process at 900 °C and 1700 °C, the weight gains of the 45HfB2-40MoSi2–15TaB2 coating reduced by 78.56% and 63.14%, respectively. Due to the coexistence of 45 vol%HfB2 and 15 vol%TaB2, the suitable Ta5+ promoted the homogenization and dispersion of Hf/Ta-oxides, which forms the coral-like Hf/Ta oxides skeleton in the glass layer, thus preventing the oxygen penetration and decreasing the inert factor of the HfB2-MoSi2 coating at 1700 °C by 51.19%. However, excessive TaB2 weakened the self-healing ability of the Ta-Hf-Si-O glass layer and inhibited the oxygen barrier effect of the HfB2-MoSi2-TaB2 coating. |
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| Keywords: | Oxygen resistance Wide temperature range |
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