Microstructure and oxidation resistance of SiC–MoSi2 multi-phase coating for SiC coated C/C composites |
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作者姓名: | Zibo He Hejun Li Xiaohong Shi Qiangang Fu Heng Wu |
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作者单位: | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University |
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基金项目: | supported by the National Natural Science Foundation of China under Grant nos.50832004 and50902111;supported by the Fundamental Research Foundation of Northwestern Polytechnical University under Grant no.GBKY1021 |
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摘 要: | In order to improve the anti-oxidation of C/C composites, a SiC–MoSi2multi-phase coating for SiC coated carbon/carbon composites(C/C)was prepared by low pressure chemical vapor deposition(LPCVD) using methyltrichlorosilane(MTS) as precursor, combined with slurry painting from MoSi2 powder. The phase composition and morphology were analyzed by scanning electron microscope(SEM) and X-ray diffraction(XRD) methods, and the deposition mechanism was discussed. The isothermal oxidation and thermal shock resistance were investigated in a furnace containing air environment at 1500 1C. The results show that the as-prepared SiC–MoSi2coating consists of MoSi2 particles as a dispersing phase and CVD–SiC as a continuous phase. The weight loss of the coated samples is 1.51% after oxidation at 1500 1C for 90 h, and 4.79% after 30 thermal cycles between 1500 1C and room temperature. The penetrable cracks and cavities in the coating served as the diffusion channel of oxygen, resulted in the oxidation of C/C composites, and led to the weight loss in oxidation.
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关 键 词: | Low pressure chemical vapor deposition SiC–MoSi2multi-phase coating Deposition mechanism Isothermal oxidation resistance Thermal shock resistance |
收稿时间: | 8 July 2013 |
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