C/SiC/Si-Mo-Cr multilayer coating for carbon/carbon composites for oxidation protection

ZHANG Yu-lei; LI He-jun; LI Ke-zhi; FEI Jie; ZENG Xie-rong

doi:10.1016/S1872-5805(12)60006-7

Volume 27 Issue 2

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Article Navigation > New Carbon Mater. > 2012 > 27(2): 105-110

ZHANG Yu-lei, LI He-jun, LI Ke-zhi, FEI Jie, ZENG Xie-rong. C/SiC/Si-Mo-Cr multilayer coating for carbon/carbon composites for oxidation protection. New Carbon Mater., 2012, 27(2): 105-110. doi: 10.1016/S1872-5805(12)60006-7

Citation:

ZHANG Yu-lei, LI He-jun, LI Ke-zhi, FEI Jie, ZENG Xie-rong. C/SiC/Si-Mo-Cr multilayer coating for carbon/carbon composites for oxidation protection. New Carbon Mater., 2012, 27(2): 105-110. doi: 10.1016/S1872-5805(12)60006-7

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C/SiC/Si-Mo-Cr multilayer coating for carbon/carbon composites for oxidation protection

doi: 10.1016/S1872-5805(12)60006-7

1. C/C Composites Research Center, National Key Laboratory of Thermostructure Composite

Materials, Northwestern Polytechnical University, Xi’an 710072, China;

College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;

Funds: Foundation item: National Natural Science Foundation of China(50902111), the NPU Foundation for Fundamental Research, the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (73-QP-2010), and the Shenzhen Key Laboratory of Special Functional Materials in Shenzhen University (T201010)

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Author Bio:
ZHANG Yu-lei(1980-), male, Associate Professor, specialize on anti-oxidation of C/C composites. 　　　　　　　　　　　　　　　　　　　　　　Tel: +86-29-88491834, Fax: +86-29-88495764, E-mail: zhangyulei@nwpu.edu.cn
Received Date: 2011-09-19
Accepted Date: 2012-07-24
Rev Recd Date: 2011-04-01
Publish Date: 2012-04-20

Abstract

Abstract

To improve the oxidation resistance of carbon/carbon (C/C) composites at high temperature, the C/C composites were first slurry-coated by carbon, then pack cemented by mixtures of Si and graphite powder (60-80∶10-25 wt/wt), followed by heat treatment to form C/C composites coated with a C/SiC layer, and finally a Si-Mo-Cr oxidation protective coating was prepared on the surface of the these composites by pack cementation. Scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy were used to characterize the compositions and microstructure of the coating. The oxidation behavior of the coated C/C composites at 1 873 and 1 973 K in air was investigated. The coating showed excellent oxidation resistance at 1 873 K due to the formation of a glassy layer of SiO₂ and Cr₂O₃ during the oxidation test, which could effectively protect C/C composites from oxidation for 135 h. The coating failed after oxidation for 30 h at 1973 K because the protective glass layer was disrupted.
- Carbon/carbon composites,
- Coating,
- Oxidation