Highly thermal conductive one-dimensional carbon/carbon composites by hot pressing synthesis
(0) Carbon/carbon composites with high thermal conductivity were prepared by hot-pressing method using mesophase pitch-based carbon-fiber and mesophase pitch.This method integrated molding,carbonization,densification and graphitization into one process.The morphology and the microstructure of composites,the influence of hot treatment temperature(HTT)and the den-sification degree on the thermal conductivity were extensively investigated.We found that the carbon/carbon composites showed re-markable anisotropy owing to one-direction design of fibers and carbon matrix parallel to fiber axis.In addition,the conditions of the HTT and the density had a great impact on the conductivity and microstructure of the composites.With the increase of HTT,the crystallite size parameters(La,Lc)and the thermal conductivity of the composites increased while the interlayer spacing(d002)de-creased.More compact internal structure and higher density the composites had,higher thermal conductivity was obtained.The composites reached high performances of the density of 2.09 g/cm3,bending strength of 135 MPa and one-direction thermal con-ductivity of 748 W/m·K at HTT of 2 850 ℃.The temperature dependence of thermal diffusion,specific heat,thermal conductivi-ty and coefficient of thermal expansion were also evaluated.
Xiaoqing Gao Quangui Guo Guozhen Xu Guodong Li Xi Yan Gengtai Zhai
Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China
国内会议
长沙
英文
1-8
2015-11-05（万方平台首次上网日期，不代表论文的发表时间）