摘要
探讨了中间相沥青基石墨纤维(MPGF)结构对热导率的影响规律。研究结果表明,所得MPGF的截面结构全为大角度开裂放射状,开裂角度为148.2°~159.7°;开裂放射状MPGF具有优异的导热性能,MPGF的单丝热导率为382~683 W·m^-1·K^-1,基本随纤维当量直径的增大而增大;XRD研究表明,纤维石墨微晶尺寸的增大有利于MPGF热导率的提高。
The relationship between the structure and thermal conductivity of mesophase pitch-based graphite fiber(MPGF)is studied in this paper.The results show that the obtained MPGF exhibits radial-like cross sectional structure with large angle cracking.The crack angle is 148.2°~159.7°.The thermal conductivity of MPGF is 382~683 W·m^-1·K^-1,and basically increases with the increase of fiber diameter.The results from XRD indicated that the increase of the crystallite size Lcof MPGF can be helpful to improve the thermal conductivity of MPGF.
作者
蒋朝
姚祥栋
厉泽
欧阳婷
Jiang Zhao;Yao Xiang-dong;Li Ze;Ouyang Ting(College of Materials Science and Engineering,Hunan University,Hunan Changsha 410082,China;Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,Hunan Changsha 410082,China)
出处
《炭素技术》
CAS
北大核心
2020年第2期35-38,43,共5页
Carbon Techniques
基金
湖南省自然科学基金(2018JJ3044)。
关键词
中间相沥青
石墨纤维
微晶尺寸
热导率
Mesophase pitch
graphite fiber
crystallite size
thermal conductivity
