作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《功能材料》 2003年第4期464-465,467,共3页

摘　　要： 　采用脉冲激光闪光法和XRD,分析了一种炭布叠层/粗糙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,并运用声子导热机制对其机理进行了探讨。结果表明,复合材料在平行于层面方向的室温导热系数约为垂直方向的2倍,但均随石墨化度的升高、石墨微晶尺寸的增大而逐渐升高,两个方向导热系数与石墨化度之间关系可分别表示为:λ=31.22+8.62exp(g/27.10)及λ=6.08+8.92exp(g/33.99)。 The relationship between the thermal conductivity and graphitization degree of a carbon cloth laminate/rough laminar pyrolitic carbon matrix composite was investigated by laser flash method and XRD. Based on the results, a mathematical model was founded, which was interpreted by phonon heat conduction mechanism. Though the thermal conductivity in the direction parallel to the layer orientation of the cloth is about two times of that vertical to the layer orientation,both the values increase with the increase of the graphitization degree ( and the stacking height of the crystallite ) of the composite, and their relations can be expressed as equations of λ=31.22+8.62exp(g/27.10) and λ=6.08+8.92exp(g/33.99) respectively.

关 键 词： 炭布叠层 热解炭 复合材料 石墨化度 导热系数

领　　域： [一般工业技术]