聚丙烯腈基高模量碳纤维导热性能的影响因素

Factors Affecting the Thermal Conductivity of PAN-based Carbon Fiber with High Modulus

采用激光闪射法测试了6种不同强度和模量的聚丙烯腈(PAN)基碳纤维(CF)的热导率,探讨了不同温度下CF轴向热导率的变化及样品厚度对热导率测试结果的影响。采用X射线衍射(XRD)、拉曼等技术检测了CF的微晶尺寸、取向及有序度,考察了CF热导率与其微观结构的相关性。结果显示,实验范围内PAN基CF样品厚度对热导率测试结果略有影响,热导率随测试温度升高而降低,PAN基CF的致密性、晶体尺寸及结构有序度对其热导率有较大影响。

The thermal conductivity of six kinds of polyacrylonitrile（PAN）-based carbon fiber（CF）with different strength and modulus was measured by laser flash method.The effect of the thickness of CF samples and the test temperature on the CF axial thermal conductivity was studied.The crystallite size,orientation and order degree of CF were measured by X-ray diffraction（XRD）and Raman spectroscopy.The relationship between the thermal conductivity of CF and its microstructure was investigated.The results show that the thickness of the PAN-based CF sample has a slight effect on the thermal conductivity test,and the thermal conductivity decreases with the increase of the test temperature.The compactness,crystal size and structural order of the PAN-based CF have a greater impact on its thermal conductivity.