短炭纤维/沥青炭复合材料导热系数与石墨化度的关系  

RELATIONSHIP BETWEEN THERMAL CONDUCTIVITY AND GRAPHITIZATION DEGREE OF CHOPPED CARBON FIBER REINFORCED PITCHDERIVED CARBON COMPOSITES

作　　者：黄启忠[1] 张福勤[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：《炭素技术》2003年第6期23-26,共4页Carbon Techniques

基　　金：国家重点工业性试验项目(计高技1998-1817)

摘　　要：采用脉冲激光闪光法和XRD技术,分析了一种短炭纤维增强沥青炭复合材料的导热系数与石墨化度之间的关系,建立了两者之间的定量数学模型,并运用声子导热机制对其机理进行了分析。结果表明,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,导热系数与石墨化度之间关系符合公式:λ=59.18+0.53exp(g/14.80)。The relationship between the thermal conductivity and graphitization degree of a chopped carbon fiber reinforced pitch- derived carbon matrix composite was explored and investigated by laser lighting and XRD techniques. A mathematical model for the relationship was founded, of which the mechanism was analyzed by phonon conductivity. The results show that the themal conductivity along the direction parallel to the layer orientation of the felt increases with the increase of the graphitization degree as well as the stacking height of the crystallite of the composite, and the relationship can be expressed as λ =59.18+ 0.53 exp(g/14.80).

关 键 词：沥青炭 C/C复合材料 石墨化度 导热系数 

分 类 号：TQ342.742[化学工程—化纤工业] TB332[一般工业技术—材料科学与工程]