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納米SiC對C/C復合材料石墨化與抗氧化性能的影響規律

Influence of nano-SiC on the graphitization and oxidation resistance of C/C composites

  • 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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