The evolution of microstructure and morphology of mesophase pitch-based carbon fibers (MPCFs) with heat treatment temperature (HTT) was investigated by SEM, TEM, Raman spectroscopy and XRD. The thermal conductivity of the MPCFs was examined by a modified 3 ω method. Results indicate that the degree of graphitization and the thermal conductivity of the MPCFs increase with HTT. The thermal conductivity of the MPCFs reaches 518 W/m·K at a HTT of 3000 °C. The thermal conductivity of MPCFs varies linearly with HTT in two distinct ranges, 1 000-2 000 and 2 300-3 000 °C, that respectively correspond to the growth and orientation of graphite crystallites.

通过SEM，TEM，拉曼光谱和XRD研究了中间相沥青基碳纤维（MPCFs）随着热处理温度（HTT）的微观结构和形貌的演变。通过改进的3ω方法检查了MPCF的导热系数。结果表明，MPTTs的石墨化程度和导热系数随HTT的增加而增加。在3000°C的高温下，MPCF的导热系数达到518 W / m·K。MPCF的热导率随HTT在两个不同的范围内线性变化，分别为1 000-2 000和2 300-3 000°C，分别对应于石墨微晶的生长和取向。