高导热中间相沥青基炭纤维的微观结构研究  

Microstructure of high thermal conductivity mesophase pitch-based carbon fibers

作　　者：叶崇[1,2,3] 吴晃 朱世鹏 樊桢[4] 黄东[1,2,3] 韩飞 刘金水[1,3] 杨建校 刘洪波[1,3] YE Chong;WU Huang;ZHU Shi-peng;FAN Zhen;HUANG Dong;HAN Fei;LIU Jin-shui;YANG Jian-xiao;LIU Hong-bo(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Hunan Province Engineering Research Center for High Performance Pitch Based Carbon Materials,Hunan Toyi Carbon Material Technology Co.,Ltd.,Changsha 410000,China;Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,Hunan University,Changsha 410082,China;Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]湖南东映碳材料科技有限公司沥青基高性能碳材料湖南省工程研究中心,湖南长沙410000 [3]湖南大学先进炭材料及应用技术湖南省重点实验室,湖南长沙410082 [4]航天材料及工艺研究所先进功能复合材料技术重点实验室,北京100076

出　　处：《新型炭材料》2021年第5期980-986,共7页New Carbon Materials

基　　金：湖南省科学技术厅创新创业技术投资项目(2018KG5065);湖南创新型省份建设专项经费资助(2019GK2021,2019RS2058).

摘　　要：本文研究了高导热(500~1127 W·m−1·K−1)中间相沥青基炭纤维的微观结构特征,初步建立了微观结构特征与导热性能之间的影响关系。通过XRD、拉曼光谱、SEM和TEM对纤维的显微结构进行了系统表征,结果表明,辐射状的纤维结构热导率较高,并伴随着劈裂状结构特征。La对热导率的影响比Lc更加显著,纤维截面上的R值可作为评估热导率的重要参照指标。在本研究所涉及的纤维中,石墨微晶尺寸越大,微晶缺陷越少,石墨微晶片层沿纤维轴向取向度越好,则炭纤维的热导率越高。The microstructural characteristics of high thermal conductivity mesophase pitch-based carbon fibers were investig-ated by XRD,Raman spectroscopy,SEM and TEM.The relationship between microstructural characteristics and thermal conductiv-ity is discussed.Results show that the radial structure is always accompanied by a splitting stucture.La has more significant impact on the thermal conductivity than Lc.The Raman spectroscopy ID/IG value of the cross section was used as an essential index to evalu-ate the thermal conductivity of the carbon fibers.The microstructural characteristics including large graphite crystallite size,high pre-ferred orientation along the fiber axis,and few defects contribute to the high thermal conductivity of the carbon fibers.

关 键 词：微观结构特征 中间相沥青 炭纤维 热导率 

分 类 号：TQ536.2[化学工程—煤化学工程]