| 原位法制备C/C复合材料SiC/Si-Al2O3-mullite复合抗氧化涂层 |
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| 引用本文： | 仝珂,李贺军,付前刚,史小红,李克智.原位法制备C/C复合材料SiC/Si-Al2O3-mullite复合抗氧化涂层[J].航空学报,2009,30(3):551-556. |
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| 作者姓名： | 仝珂 李贺军 付前刚 史小红 李克智 |
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| 作者单位： | 西北工业大学超高温复合材料重点实验室炭/炭复合材料工程技术研究中心,陕西两安,710072 |
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| 基金项目： | 国家自然科学基金(90716024) |
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| 摘 要： | 以Si和Al2O3为原料，采用原位生成法在带有SiC内涂层的炭/炭（C/C）复合材料表面制备出Si-Al2O3-mullite（莫来石）抗氧化涂层。采用X射线衍射、扫描电镜和氧化实验研究了Al2O3含量等工艺因素对Si-Al2O3-mullite涂层的物相组成、结构形貌、抗氧化性能影响。结果表明：Al2O3质量含量为30%~40%时，涂层主要由Si，mullite和Al2O3三相组成，涂层致密无裂纹，抗氧化性能最佳。在1 500 ℃等温氧化测试显示，SiC/Si-Al2O3-mullite复合涂层比单一的SiC涂层抗氧化性能有明显提高，1 500 ℃等温氧化75 h试样失重为4.6%。涂层试样失重的主要原因是涂层中产生了不可愈合的孔隙缺陷。
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| 关 键 词： | 炭/炭复合材料 涂层 氧化 原位法 莫来石 |
Sic/Si-Al2O3-mullite Oxidation Protective Coating for C/C Composites Prepared by In-situ Formation Method |
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| Tong Ke,Li Hejun,Fu Qiangang,Shi Xiaohong,Li Kezhi.Sic/Si-Al2O3-mullite Oxidation Protective Coating for C/C Composites Prepared by In-situ Formation Method[J].Acta Aeronautica et Astronautica Sinica,2009,30(3):551-556. |
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| Authors: | Tong Ke Li Hejun Fu Qiangang Shi Xiaohong Li Kezhi |
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| Institution: | C/C Composites Research Center;Key Laboratory of Superhigh Temperature Composites;Northwestern Polytechnical University;Xi'an 710072;China |
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| Abstract: | A Si-Al2O3-mullite oxidation protective coating was prepared on SiC coated carbon-carbon(C/C) composites by in-situ formation using Si and Al2O3 as raw materials in an oxidation atmosphere.The effects of the Al2O3 content on the phase component,microstructures,and oxidation-resistance property of the Si-Al2O3-mullite coating were studied.Results show that the coating is dense and composed of Si,mullite,and Al2O3 when the content of Al2O3 is 30 wt%-40 wt%.The oxidation test indicates that the SiC/Si-Al2O3-mu... |
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| Keywords: | C/C composites coatings oxidation in-situ formation method mullite |
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