Effect of Graphitization on the Morphologies and Microstructures of Micro-coiled Carbon Fibers

Micro-coiled carbon fibers were prepared by a catalytic chemical vapor deposition method, and treated in an argon atmosphere at 2500℃.Scanning electron microscope(SEM),Raman spectro- scope and X-ray diffraction(XRD)were performed to characterize morphologies and microstructures of the non-graphitizated and graphitizated micro-coiled carbon fibers,and graphitization mechanism was discussed preliminarily.The results reveal that micro-coiled carbon fibers are purified prominently, morphologies of micro-coiled carbon fibers is similiar to the original fibers,and microstructures of micro- coiled carbon fibers are more regular after the graphitization treatment.The interlayer spacing d_(002) (0.3626-0.3378nm)decreases,graphitization degree,L_c,mean size of crystal in the c-direction(1.6404- 3.8590nm)and L_a,mean size of crystal in the a-direction(2.04-7.21nm)increase.