Influence of nano-SiC on the graphitization and oxidation resistance of C/C composites
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摘要: 本文制備納米SiC基體改性的SiC-C/C復合材料，利用X射線衍射技術、高分辨率透射電鏡等研究SiC對碳材料的石墨化度的影響.納米SiC能夠顯著促進碳基體材料的石墨化度，同時通過高分辨率透射電鏡在納米SiC顆粒周圍觀測到明顯的石墨化結構，并且距離SiC越近，碳基體的石墨化程度越高.通過靜態氧化實驗研究SiC-C/C復合材料的抗氧化性能.結果表明，隨著SiC加入量的增加復合材料的抗氧化性顯著提高，納米SiC在高溫下生成較為均勻的SiO2保護層，覆蓋在碳材料的表面，阻礙氧氣與碳材料的接觸，并且SiC含量越高，形成的保護層越厚，抗氧化能力越強.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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Key words:
- carbon/carbon composites /
- nanoparticles /
- silicon carbide /
- graphitization /
- oxidation resistance
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參考文獻
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