MODIFIEDSiC-MoSi2OXIDATION PROTECTIVE COATING FORSiC-COATED CARBON/CARBON COMPOSITES THROUGH INFILTRATING LIQUIDSi

Zheng-Zhong Zhang, He-Jun Li (), Chao Ma, Qian-Gang Fu, Yu-Lei Zhang, Heng Wu and Jun Tao
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Zheng-Zhong Zhang: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
He-Jun Li: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
Chao Ma: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
Qian-Gang Fu: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
Yu-Lei Zhang: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
Heng Wu: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
Jun Tao: State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China

Surface Review and Letters (SRL), 2011, vol. 18, issue 03n04, 109-114

Abstract: To improve the oxidation resistance of theSiC-MoSi2coating prepared by two-step pack cementation, a liquidSiinfiltrating method was adopted to modify it. The phase composition and microstructure of the coatings were analyzed by XRD and SEM. The results show that the size and number of the cracks in the modified coating decreased evidently after infiltratingSi. The oxidation test results in air at 1773 K show that the mass loss of theSiC-MoSi2coating coated carbon/carbon (C/C) composites was up to 1.18% after oxidation for 206 h, while that of the modified coating coatedC/Ccomposites was only 0.77% after oxidation for 460 h. The reason is that the cracks formed in the pack cementation process were partly sealed and there were no penetrable cracks in the modified coating. Therefore, there were no direct channels for the oxygen to diffuse into theC/Csubstrate.

Keywords: Carbon/carbon composites; coating; SiC; SiO2 (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1142/S0218625X11014539

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