Microstructure and anti-oxidation properties of multi-composition ceramic coatings for carbon/carbon composites |
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Authors: | Feng TaoLi He-Jun Fu Qian-GangZhang Yu-Lei Shi Xiao-Hong |
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Affiliation: | C/C Composites Technology Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi’an Shaanxi 710072, PR China |
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Abstract: | To protect carbon/carbon (C/C) composites from oxidation at elevated temperature, an effective WSi2-CrSi2-Si ceramic coating was deposited on the surface of SiC coated C/C composites by a simple and low-cost slurry method. The microstructures of the double-layer coatings were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy analyses. The coating exhibited excellent oxidation resistance and thermal shock resistance. It could protect C/C composites from oxidation in air at 1773 K for 300 h with only 0.1 wt.% mass gain and endure the thermal shock for 30 cycles between 1773 K and room temperature. The excellent anti-oxidation ability of the double-layer WSi2-CrSi2-Si/SiC coating is mainly attributed to the dense structure of the coating and the formation of stable vitreous composition including SiO2 and Cr2O3 produced during oxidation. |
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Keywords: | Carbon/carbon composites Ceramic Coating Oxidation |
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