Oxidation protection of carbon/carbon composites with SiC/indialite coating for intermediate temperatures |
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| Authors: | Li Ke-Zhi Lan Feng-Tao Li He-Jun Shen Xue-Tao He Yong-Gang |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China;2. Department of Mechanical Engineering, California State University, Los Angeles, CA 90032, USA;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, PR China;2. School of Material Science and Engineering, Shandong University of Technology, Zibo 255049, PR China;1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Nanjing Tech University Suqian Advanced Materials Institute, Suqian 223800, China;3. National Key Laboratory of Advanced Composite, Avic Composite Corporation Ltd., Beijing 101300, China |
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| Abstract: | In order to improve the oxidation resistance of carbon/carbon composites at intermediate temperatures, a novel double-layer SiC/indialite coating was prepared by a simple and low-cost method. The internal SiC transition layer was prepared by pack cementation and the external indialite glass–ceramic coating was produced by in situ crystallization of ternary MgO–Al2O3–SiO2 glass. The microstructures and morphologies of coating were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). Oxidation resistance of the as-coated C/C composites was evaluated in ambient air at temperature from 800 °C to 1200 °C. Nearly neglectable mass loss was measured after 100 h isothermal oxidation test, indicating that SiC/indialite coating possesses excellent oxidation protection ability. The as-coated samples have a good thermal shock resistance and no obvious damage was found in the coating even after suffered more than 11 thermal cycles between test temperature and room temperature. The oxidation protection mechanism of this coating was also discussed. |
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