| W-Mo-Si/SiC Oxidation Protective Coating for Carbon/Carbon Composites |
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| 作者姓名： | Dangshe HOU Kezhi LI Hejun LI Qiangang FU Jian WEI Yulei ZHANG |
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| 作者单位： | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University Xi＇an 710072, China |
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| 基金项目： | 航天科技基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | A W-Mo-Si/SiC double-layer oxidation protective coating for carbon/carbon （C/C） composites was prepared by a two-step pack cementation technique. XRD （X-ray diffraction） and SEM （scanning electron microscopy）results show that the coating obtained by the first step pack cementation was a thin inner buffer layer of SiC with some cracks and pores, and a new phase of （WxMo1-x）Si2 appeared after the second step pack cementation. Oxidation test shows that, after oxidation in air at 1773 K for 175 h and thermal cycling between 1773 K and room temperature for 18 times, the weight loss of the W-Mo-Si/SiC coated C/C composites was only 2.06%. The oxidation protective failure of the W-Mo-Si/SiC coating was attributed to the formation of some penetrable cracks in the coating.
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| 关 键 词： | 涂料 微结构 氧化 粉末冶金合成物 碳合成物 |
| 收稿时间： | 2006-10-30 |
| 修稿时间： | 2006-10-302007-01-26 |
W-Mo-Si/SiC Oxidation Protective Coating for Carbon/Carbon Composites |
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| Dangshe HOU Kezhi LI Hejun LI Qiangang FU Jian WEI Yulei ZHANG.W-Mo-Si/SiC Oxidation Protective Coating for Carbon/Carbon Composites[J].Journal of Materials Science & Technology,2007,23(4):559-562. |
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| Authors: | Dangshe HOU Kezhi LI Hejun LI Qiangang FU Jian WEI Yulei ZHANG |
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| Affiliation: | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi′an 710072, China |
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| Abstract: | A W-Mo-Si/SiC double-layer oxidation protective coating for carbon/carbon (C/C) composites was prepared by a two-step pack cementation technique. XRD (X-ray diffraction) and SEM (scanning electron microscopy)results show that the coating obtained by the first step pack cementation was a thin inner buffer layer of SiC with some cracks and pores, and a new phase of (WxMo1-x)Si2 appeared after the second step pack cementation. Oxidation test shows that, after oxidation in air at 1773 K for 175 h and thermal cycling between 1773 K and room temperature for 18 times, the weight loss of the W-Mo-Si/SiC coated C/C composites was only 2.06%. The oxidation protective failure of the W-Mo-Si/SiC coating was attributed to the formation of some penetrable cracks in the coating. |
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| Keywords: | C/C composites Coating Microstructure Oxidation |
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