Abstract：In this paper, the Cf/B4C composites were fabricated by spark plasma sintering (SPS). The graphitization degree of polyacrylonitrile (PAN) carbon fibers was characterized by X-ray diffraction and Laser Raman spectroscopy. The effects of sintering temperature, sintering pressure and holding time on the graphitization of carbon fibers were focused on. The results show that temperature, pressure and holding time have certain effects on the graphitization of carbon fibers, and the effect of temperature is the most obvious. When the sintering temperature reaches 2 000 ℃, the crystal plane spacing d(002) of carbon fiber by XRD and Raman peak intensity ratio (ID/IG) is 0.336 nm and 0.377 respectively, and the graphitization degree of carbon fibers reaches 92.21%. According to the corresponding relationship between the graphitization degree measured by XRD and Raman spectrum, the graphitization degree formula of carbon fibers characterized by Raman spectrum is fitted. The low-temperature graphitization of PAN carbon fibers under SPS is due to the fact that SPS combines the influences of temperature, pressure and current. In addition, the main catalytic mechanism is dissolution and reprecipitation. The difference of interfacial activation may be the fundamental reason for the different graphitization degree of carbon fibers.
刘红浩, 曾凡浩, 张福勤. 放电等离子烧结下碳化硼对聚丙烯腈基碳纤维石墨化的影响[J]. 粉末冶金材料科学与工程, 2022, 27(6): 601-609.
LIU Honghao, ZENG Fanhao, ZHANG Fuqin. Effect of boron carbide on graphitization of polyacrylonitrile based carbon fibers during spark plasma sintering. Materials Science and Engineering of Powder Metallurgy, 2022, 27(6): 601-609.
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