Oxidation-protective and mechanical properties of SiC nanowire-toughened Si–Mo–Cr composite coating for C/C composites |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Mechatronic Engineering, Northwestern Polytechnical University, Xi’an 710072, China;3. The Shaanxi Key Laboratory of Space Materials Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China;1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. Shaanxi Province Key Laboratory of Fiber Reinforced Light Composites Materials, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;2. Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China |
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| Abstract: | Oxidation-protective SiC nanowire-toughened Si–Mo–Cr composite coating prepared on the carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation was investigated in this study. After incorporating SiC nanowires, the hardness, elastic modulus and fracture toughness of the composite coating were increased by 6.12%, 20.89% and 35.78%, respectively, due to the toughening and strengthening mechanisms including nanowire pullout, nanowire bridging, microcrack deflection and good interaction between nanowire/matrix interface. Thermogravimetric analysis revealed that the maximum weight loss of the coated C/C samples was decreased from 5.87% to 3.93% by incorporating SiC nanowires from room temperature to 1500 °C. |
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