In this study, commercially available pitch-based carbon fibers of general grade were post-heat-treated using a boxtype high temperature furnace at 1800℃, 2000˚, 2200℃, and 2400℃, respectively. The fundamental characteristics of each heat-treated carbon fibers were investigated in terms of chemical composition, morphology, thermal stability, X-ray diffraction, single filament tensile test, and electrical resistivity. The result showed that the fiber properties were significantly influenced by the post-heat-treatment, indicating the greater effect with increasing treatment temperature. The carbon contents, thermal stability, and tensile properties of the carbon fibers used here were further increased by the post-heat-treatment, whereas the d-spacing between graphene layers and the electrical resistivity were reduced with increasing post-heat-treatment temperature.

• Sung-Bong Yoon(Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
• Chae-Wook Cho(Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
• Dong-Hwan Cho(Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
• Jong-Kyoo Park(Polymer Composite Lab, Agency for Defense Development)
• Jae-Yeol Lee(Polymer Composite Lab, Agency for Defense Development)