为了获得一种制备简单、成本低廉的电磁屏蔽材料, 通过喷涂法在 2D 碳纤维 (carbon fiber, CF) 预制体上负载氧化石墨烯(graphene oxide, GO), 并以硼酚醛树脂(boron-phenolic resin, BPF) 作为前驱体, 石墨烯负载碳纤维 (GO/CF) 作为预制体, 通过热压成型和碳化工艺制备得到氧化石墨烯改性碳/碳复合材料 (GO/C/C). 采用 X 射线衍射 (X-ray diffraction, XRD)、扫描电子显微镜 (scanning electron microscope, SEM)、拉曼光谱 (Raman spec-trum)、密度仪 (densitometer) 和矢量网络分析仪 (vector network analyzer) 对复合材料进行表征. 结果表明, 当 GO 的负载量为 0.1%、0.3% 时, GO/CF 预制体的表面形貌最好; 负载量为 0.3% 时, 复合材料具有最高的孔隙率和最低的电阻率; 负载量为 0.1% 时, 复合材料在 X波段的总电磁屏蔽效能最高, 达到了 43.84 dB, 相比于空白样品提高了 28.3%, 已满足基本的商用需求.

In order to obtain a simple and low-cost electromagnetic shielding material, the 2D carbon fiber (CF) precast was loaded with graphene oxide (GO) by spraying method, and the boron-phenolic resin (BPF) was used as the precursor, and the graphene supported carbon fiber (GO/CF) was used as the precast. GO modified carbon/carbon composites (GO/C/C) were prepared by hot press molding method and carbonization process. X-ray Diffraction (XRD), scanning electron microscope (SEM), Raman spectrum, densitometer and vector network analyzer were used to characterize the composites. The results show that the surface morphology of GO/CF preform is the best when the load of GO is 0.1% and 0.3%. When GO content is 0.3%, the composites have the highest porosity and the lowest resistivity. When the load of GO is 0.1%, the total electromagnetic shielding efficiency of the composite in the X-band is the highest, reaching 43.84 dB, which is 28.3%higher than that of the blank sample, and has met the basic commercial requirements.