Oxidation behavior and microstructure evolution of SiC-ZrB2-ZrC coating for C/C composites at 1673 K |
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| Affiliation: | 1. C/C Composites Technology Research Center, Northwestern Polytechnical University, Xi?an, Shaanxi 710072, PR China;2. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi?an, Shaanxi 710072, PR China;1. Japan Aerospace Exploration Agency, Structures and Advanced Composite Research Unit, Mitaka-shi, Ohsawa, 6-13-1, Tokyo, 181-0015, Japan;2. Tokyo University of Science, Department of Materials Science and Technology, Katsushika-ku, Nijyuku, 6-3-1, 125-8585, Tokyo, Japan;3. The University of Tokyo, Research Center for Advanced Science and Technology, Meguro-ku, Komaba, 4-6-1, 153-8904, Tokyo, Japan;4. Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Chuo-ku, Yoshinodai, 3-1-1, Kanagawa, Sagamihara, 252-5210, Japan;1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;2. Material Corrosion and Protection Key Laboratory of Sichuan province, Zigong 643000, China;3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;1. C/C Composites Technology Research Center, Northwestern Polytechnical University, Xi''an, Shaanxi 710072 PR China;2. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi''an, Shaanxi 710072 PR China |
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| Abstract: | To protect carbon/carbon (C/C) composites against oxidation, a SiC-ZrB2-ZrC coating was prepared by the in-situ reaction between ZrC, B4C and Si. The thermogravimetric and isothermal oxidation results indicated the as-synthesized coating to show superior oxidation resistance at elevated temperatures, so it could effectively protect C/C composites for more than 221 h at 1673 K in air. The crystalline structure and morphology evolution of the multiphase SiC-ZrB2-ZrC coating were investigated. With the increase of oxidation time, the SiO2 oxide layer transformed from amorphous to crystalline. Flower-like and flake-like SiO2 structures were generated on the glass film during the oxidation process of SiC-ZrB2-ZrC coating, which might be ascribed to the varying concentration of SiO. The oxide scale presented a two-layered structure ~130 µm thick after oxidation, consisting of a SiO2-rich glass layer containing ZrO2/ZrSiO4 particles and a Si-O-Zr layer. The multiphase SiC-ZrB2-ZrC ceramic coating exhibited much better oxidation resistance than monophase SiC, ZrB2 or ZrC ceramic due to the synergistic effect among the different components. |
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| Keywords: | A Sintering B Composites C Corrosion D SiC |
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