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以鳞片石墨为原料采用Hummers法制备氧化石墨烯。以石墨烯掺杂的气相生长碳纤维(VGCF)、中间相沥青(MP)为原料,经低温热模压、炭化、石墨化处理制备高强度、高密度的石墨烯掺杂气相生长碳纤维中间相沥青基复合材料。采用扫描电子显微镜来观察样品的微观形貌;通过强力机、四探针测试仪等表征复合材料的性能。结果表明,随着石墨烯掺杂量的增加,复合材料的抗弯强度及导电性能先增大后减小。当石墨烯掺杂比例为9.09%时,炭化后复合材料的密度为1.646g/cm~3,抗弯强度为85.7MPa,电阻率为1.27×10~(-5)Ω·m。
The flake graphite as raw material was prepared by Hummers graphene oxide. The graphene-doped VGCF and mesophase pitch (MP) were used as raw materials to prepare high-strength and high-density graphene-doped vapor grown carbon fiber mesophase pitch based on low-temperature thermal molding, carbonization and graphitization Composites. Scanning electron microscopy was used to observe the microstructure of the sample. The mechanical properties of the composites were characterized by a powerful machine, a four-probe tester and the like. The results show that with the increase of graphene doping amount, the flexural strength and electrical conductivity of the composites first increase and then decrease. When the graphene doping ratio is 9.09%, the density of carbonized composite is 1.646g / cm ~ 3, the flexural strength is 85.7MPa and the resistivity is 1.27 × 10 ~ (-5) Ω · m.