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Effect of SiC Nanowires on the Mechanical and Oxidation Protective Ability of SiC Coating for C/C Composites

Authors

  • Chu Yanhui,

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Fu Qiangang,

    Corresponding author
    • State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Li Hejun,

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Shi Xiaohong,

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Li Kezhi,

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Wen Xue,

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • Shang Gunan

    1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an, China
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  • This work has been supported by the National Natural Science Foundation of China under Grant Nos. 51072166 and 50832004, the Program for New Century Excellent Talents in University, the Research Fund of State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 25-TZ-2009) and the Doctorate Foundation of Northwestern Polytechnical University.

Author to whom correspondence should be addressed. e-mail: fuqiangang@nwpu.edu.cn

Abstract

To protect carbon/carbon (C/C) composites against oxidation, a SiC nanowire-toughened SiC coating with homogeneously dispersed nanowires within the coating was successfully prepared on C/C composites by a simple and low cost two-step technique of chemical vapor deposition and pack cementation. The SiC nanowires effectively increased the mechanical properties of the coating, decreased the size of the defects in the coating, and improved the oxidation protection effectiveness of the coating. The results showed that, after introducing the SiC nanowires, the hardness, elastic modulus, and fracture toughness of the SiC coating were increased by 5%, 19%, and 48%, respectively. The mass loss of the coated C/C samples was reduced from 8.10% to 5.21% after thermogravimetric analysis in air from 873 to 1773 K. Moreover, the mass loss of the SiC nanowire-toughened SiC coated sample was only 14.33% and 2.68% after isothermal oxidation at 1173 K for 39 h and 1773 K for 44 h in air, whereas the mass loss of the pure SiC coated sample was up to 16.12% and 7.00% after isothermal oxidation at 1173 K for 15 h and 1773 K for 20 h in air.

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