The evolution of microstructure and thermal conductivity of mesophase pitch-based carbon fibers with heat treatment temperature

Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Zhen Fan, Min Cao, Wen-bing Yang, Shi-peng Zhu, Zhi-hai FengAbstractThe 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.

Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research