纳米SiC对C/C复合材料石墨化与抗氧化性能的影响规律 |
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作者姓名: | 甄强 鲁飞 宋绍雷 李榕 郑锋 |
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作者单位: | 上海大学纳米科学与技术研究中心,上海200444;上海大学材料科学与工程学院,上海200444;上海大学纳米科学与技术研究中心,上海,200444 |
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基金项目: | 国家自然科学基金资助项目(51272154) |
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摘 要: | 本文制备纳米SiC基体改性的SiC-C/C复合材料,利用X射线衍射技术、高分辨率透射电镜等研究SiC对碳材料的石墨化度的影响.纳米SiC能够显著促进碳基体材料的石墨化度,同时通过高分辨率透射电镜在纳米SiC颗粒周围观测到明显的石墨化结构,并且距离SiC越近,碳基体的石墨化程度越高.通过静态氧化实验研究SiC-C/C复合材料的抗氧化性能.结果表明,随着SiC加入量的增加复合材料的抗氧化性显著提高,纳米SiC在高温下生成较为均匀的SiO2保护层,覆盖在碳材料的表面,阻碍氧气与碳材料的接触,并且SiC含量越高,形成的保护层越厚,抗氧化能力越强.
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关 键 词: | 碳/碳复合材料 纳米颗粒 碳化硅 石墨化 抗氧化性能 |
收稿时间: | 2016-03-23 |
Influence of nano-SiC on the graphitization and oxidation resistance of C/C composites |
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Affiliation: | 1) Nanoscience and Technology Research Center, Shanghai University, Shanghai 200444, China2) Material Science and Engineering, Shanghai University, Shanghai 200444, China |
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Abstract: | SiC-carbon/carbon (C/C) composites were prepared by doping nano-SiC, and the influence of nano-SiC on the graphitization degree of carbon material was investigated by X-ray diffraction and high-resolution transmission electron microscopy (HRTEM). The nano-SiC can promote the graphitization degree of carbon material. An apparent graphitization structure around the nano SiC was observed by HRTEM, and the carbon material has a higher graphitization degree when it is closer to the nano-SiC. The oxidation resistance of SiC-C/C composites was also studied through static oxidation experiment. It is found that the anti-oxidation performance of C/C composites increases with increasing nano-SiC content, and the nano-SiC forms a uniform SiO2 protective layer at high temperature, which could cover the carbon material surface to prevent the material from oxidation. In addition, the SiO2 protective layer is thicker and has a higher oxidation resistance property when the matrix material contains more nano-SiC. |
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