Microstructure and thermal/mechanical properties of short carbon fiber-reinforced natural graphite flake composites with mesophase pitch as the binder
Microstructure and thermal/mechanical properties of short carbon fiber-reinforced natural graphite flake composites with mesophase pitch as the binder
复制标题
以中间相沥青为粘结剂的短碳纤维增强天然鳞片石墨复合材料的微观结构和热/力学性能
DOI：
10.1016/j.carbon.2012.11.013
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发表时间：
2013-03
期刊：
影响因子：
10.9
通讯作者：
刘占军
中科院分区：
文献类型：
--
作者：
刘占军
短碳纤维增强石墨块（SFG）由中间相沥青、天然石墨片和短碳纤维的混合物通过2773K热压制成。研究了纤维含量对 SFG 的结构和热/机械性能的影响。研究发现，引入纤维降低了致密化，并且还改变了孔结构和孔径分布。与原始块相比，所有 SFG 的面内导热性和机械强度都得到了改善。热流网络的形成和晶体尺寸的增加对面内导热系数的提升产生了协同效应。当纤维含量为6wt.%时面内导热系数达到最大值。机械强度的增加主要归因于纤维从基体中的拉出。当纤维含量为8wt.%时，垂直于石墨层方向的弯曲强度和压缩强度分别达到最大值39.6MPa和65.5MPa。
Short carbon fiber reinforced graphite blocks (SFGs) were fabricated from a mixture of mesophase pitch, natural graphite flakes and short carbon fibers by hot-pressing at 2773K. The effect of fiber content on the structure and thermal/mechanical properties of the SFGs was investigated. It was found that introducing the fibers lowered the densification, and also changed the pore structure and pore size distribution. Compared with the pristine block, all the SFGs earned improved in-plane thermal conductivity and mechanical strength. The formation of a heat flow network and the increase of crystalline sizes made a synergistic effect on the promotion of in-plane thermal conductivity. In-plane thermal conductivity reached the maximum when the fiber content was 6wt.%. The increase of mechanical strength was mainly attributed to the pull-out of fibers from the matrix. The bend and compressive strength in the direction perpendicular to graphite layers reached the maximum values of 39.6MPa and 65.5MPa for fiber content of 8wt.%, respectively.
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