炭纤维针刺整体毡/热解炭复合材料导热系数与石墨化度之间的关系  

Relationship between Thermal Conductivity and Graphitization Degree of Carbon Fiber Neddled Felt Reinforced Pyrolytic Carbon Composite

作　　者：张福勤[1] 黄伯云[1] 黄启忠[1] 熊翔[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《矿冶工程》2003年第3期57-59,64,共4页Mining and Metallurgical Engineering

基　　金：国家重点工业性试验项目 (计高技 1 998- 1 81 7)

摘　　要：采用脉冲激光闪光法测量热扩散率 ,XRD测量石墨化度。研究了PAN基炭纤维针刺整体毡增强光滑层结构热解炭复合材料的导热系数与石墨化度之间的关系 ,建立了二者之间的定量数学模型。运用声子导热机制对导热变化机理进行了分析。随着石墨化度的升高 ,石墨微晶尺寸增大、结构渐趋完整 ,复合材料在平行于层面方向的室温导热系数逐渐升高 ,导热系数λ与石墨化度g之间关系符合公式 :λ =0 .63 + 4.93exp(g 2 1.94)。The relationship between the thermal conductivity and graphitization degree of a PAN based carbon fiber needed felt reinforced pyrolytic carbon matrix composite was investigated, establishing the quantitative mathematical model between both of them. The variation in heat conduction is analyzed using phonon heat conduction mechanism. It is found that the thermal conductivity along the direction parallel to the layer orientation of the felt increases with the increase of graphitization degree(and the stacking height of the crystallite) of the composite. The relationship between λ and g can be written as follows: λ =0.63+4.93exp( g /21.94).

关 键 词：炭纤维针刺整体毡/热解炭复合材料 导热系数 石墨化度 C/C复合材料 脉冲激光闪光法 XRD 热扩散率 

分 类 号：TB332[一般工业技术—材料科学与工程]