Polyacrylonitrile (PAN)-based carbon fibers were impregnated with boric acid (H3BO3) before laser graphitization.The influence of H3BO3 impregnation on laser graphitization effect was investigated by changing H3BO3 content and impregnation time.The chemical structure and microscopic morphology of the graphitized carbon fibers were characterized by Raman spectrometer and X-ray diffractometer.The results showed that trace boron could enter the graphite lamellar structure,the stacking thickness Lc of graphite carbon microcrystals increased,the graphite lamellar spacing d002 decreased,the azimuth half-height width decreased,the crystallinity increased,and the degree of graphitization increased.However,excessive boron decreased the microcrystal crystallinity and graphitization degree.Under the same H3BO3 concentration and impregnation time,the degree of graphitization of carbon fibers increased significantly with the increase of laser power.
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