SiC nanowire-toughened SiC-MoSi2-CrSi2 oxidation protective coating for carbon/carbon composites |
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Authors: | Chu Yan-Hui Cao Cui-Wei Li He-Jun Li Ke-Zhi Lei Qin |
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Affiliation: | C/C Composites Research Center, Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an 710072, PR China |
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Abstract: | To prevent carbon/carbon (C/C) composites from oxidation, a dense SiC nanowire-toughened SiC-MoSi2-CrSi2 multiphase coating was prepared by the two-step technique composed of chemical vapor deposition (CVD) and pack cementation. The coatings were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). SiC nanowires could decrease the dimension of cracks and improve the oxidation and thermal shock resistance of SiC-MoSi2-CrSi2 multiphase coating. Oxidation test shows that, after introducing SiC nanowires, the weight loss of the coated sample can be reduced from 1.06% to 0.64% after oxidation at 1773 K for 155 h and decreased from 6.92% to 3.42% after thermal cycling between 1773 K and room temperature for 30 times. |
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Keywords: | Carbon/carbon composites Oxidation Coating |
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