A ZrSiO4/SiC oxidation protective coating for carbon/carbon composites |
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Authors: | Jia Liu Li-Yun Cao Jian-Feng Huang Yu Xin Wen-Dong Yang Jie Fei Chun-Yan Yao |
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Affiliation: | 1. Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, School of Material Science and Engineering, Shaanxi University of Science and Technology, Xi''an, Shaanxi, 710021, P. R. China;2. Laboratory of Opto-Functional Materials and Photochemistry, Technical Institute of Physics and Chemistry, Chinese Academy of sciences, Beijing, 100190, P. R. China |
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Abstract: | In order to improve the oxidation resistance of carbon/carbon (C/C) composites, a ZrSiO4 coating on SiC pre-coated C/C composites was prepared by a hydrothermal electrophoretic deposition process. Phase compositions and microstructures of the as-prepared ZrSiO4/SiC coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The anti-oxidation property and failure mechanism of the multi-layer coating were investigated. Results show that hydrothermal electrophoretic deposition is an effective route to prepare crack-free ZrSiO4 outer coatings. The multi-layer coating obviously exhibits two-layer structure. The inner layer is composed of SiC phase and the outer layer is composed of ZrSiO4 phase. The bonding strength between the outer layer coatings and C/C–SiC substrate are 30.38 MPa. The ZrSiO4/SiC coating displays excellent oxidation resistance and can protect C/C composites from oxidation at 1773 K for 332 h with a mass loss rate of only 0.48 × 10− 4 g/cm2·h. The mechanical properties of the specimens are 84.36 MPa before oxidation and 68.29 MPa after oxidation. The corresponding high temperature oxidation activation energy of the coated C/C composites at 1573–1773 K is calculated to be 119.8 kJ/mol. The oxidation process is predominantly controlled by the diffusion rate of oxygen through the ZrSiO4/SiC multi-coating. The failure of the coating is due to the formation of penetrative holes between the SiC bonding layer and the C/C matrix at 1773 K. |
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Keywords: | Carbon/carbon composites ZrSiO4 coating Hydrothermal electrophoretic deposition Oxidation |
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