SiC-Si-ZrSiO_4 Multiphase Oxidation Protective Coating for Carbon/Carbon Composites |
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Authors: | Yulei ZHANG Hejun LI Qiangang FU Kezhi LI Dangshe HOU C/C Composites Technology Research Center Laboratory of Superhigh Temperature Composites Northwestern Polytechnical University Xi'an China |
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Affiliation: | C/C Composites Technology Research Center, Laboratory of Superhigh Temperature Composites, Northwestern Polytechnical University, Xi0an 710072, China |
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Abstract: | In order to improve the anti-oxidation property of carbon/carbon (C/C) composites,a novel SiC-Si-ZrSiO4 multiphase oxidation protective coating was produced on the surface of C/SiC coated carbon/carbon compos-ites by a pack cementation technique.The phase composition and microstructure of the as-prepared coatings were characterized by XRD (X-ray diffraction),SEM (scanning electron microscopy) and EDS (energy dis-persive spectroscopy).Oxidation behavior of the multiphase coated C/C composites was also investigated.It showed that the as-prepared coating characterized by excellent oxidation resistance and thermal shock re-sistance could effectively protect C/C composites from oxidation at 1773 K for 57 h in air and endure the thermal cycle between 1773 K and room temperature for 12 times,whereas the corresponding weight loss is only 1.47%.The excellent oxidation protective ability of the SiC-Si-ZrSiO4 coating could be attributed to the C/SiC gradient inner layer and the multiphase microstructure of the coating. |
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Keywords: | Carbon/carbon composites Oxidation Coating |
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