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以高导热沥青基炭纤维布为增强体,中间相沥青为黏结剂,采用热模压成型及液相浸渍裂解工艺增密,并经高温石墨化处理制备二维高导热炭/炭复合材料。利用X射线衍射仪和透射电子显微镜对经不同温度处理后的沥青基炭纤维及二维高导热炭/炭复合材料的结构和形貌变化进行表征,并考察石墨化处理温度对复合材料热导率的影响。结果表明,随着热处理温度的升高,纤维及复合材料内部石墨微晶尺寸增大、取向度变好,纤维与基体间界面结合紧密、裂纹减少,而基体碳层间裂纹则呈扩大趋势。此外,二维高导热炭/炭复合材料的热导率随热处理温度的升高而线性增加,经3 000℃处理后,材料热导率高达443 W/m·K。
Using high thermal conductive pitch-based carbon fiber cloth as reinforcement and mesophase pitch as binder, the two-dimensional high thermal conductive carbon / carbon composite material was prepared by hot stamping and liquid immersion pyrolysis process and high temperature graphitization. The structure and morphology of bitumen-based carbon fibers and two-dimensional high thermal conductive carbon / carbon composites treated by different temperature were characterized by X-ray diffraction and transmission electron microscopy. The effects of graphitization temperature on the thermal conductivity Rate of impact. The results show that with the increase of the heat treatment temperature, the crystallite size and the orientation of the graphite in the fiber and the composite increase. The interface between the fiber and the matrix is close and the cracks decrease while the cracks between the carbon layers of the matrix increase. In addition, the thermal conductivity of two-dimensional highly conductive carbon / carbon composites increases linearly with the increase of the heat treatment temperature, and the thermal conductivity of the two-dimensional high thermal conductive carbon / carbon composites increases up to 443 W / m · K after 3 000 ℃.