CoFeBSiNb/Graphene复合材料吸波性能研究

Study on Microwave Absorbing Properties of CoFeBSiNb/Graphene Composites

摘要: 吸波材料有吸波涂层厚度薄的技术发展要求。本文研究化学腐蚀表面处理的Co基非晶粉末和不同质量分数石墨烯的复合材料的吸波性能。实验通过Y2000型X射线粉末衍射仪(XRD)对晶格结构进行表征，通过S-4800型扫描电子显微镜(SEM)对表面形貌进行表征，通过N5230型网络矢量分析仪(VNA)对电磁参数进行表征。实验结果表明，随着石墨烯质量分数的增加，复合材料最强吸收峰对应吸波涂层厚度依次减小，吸波性能和吸波性能优异−10 dB的频带宽度均呈现先增强后减弱趋势，且最大反射损耗峰向高频方向移动。当石墨烯质量分数为8%时，吸波涂层厚度仅为1.4 mm时，最大反射损耗值达到−39.3 dB，频带宽度达到3.28 GHz。可见CoFeBSiNb/Graphene复合材料在薄吸波涂层厚度情况下具有优异的吸波性能，在吸波领域具有良好的应用前景。

Abstract: The thin coating thickness is a requirement for excellent microwave absorbing materials. In this paper, the influencing parameters such as composite with graphene for microwave absorbing properties were investigated. X-ray diffraction patterns were done to analyze the crystal structure. The scanning electron microscopy was used to evaluate the morphology of composite materials. The complex permittivity and complex permeability were measured by a vector network analyzer at a frequency of 2~18 GHz. The result of experiment shows that, with the increase in mass fraction of graphene, the thickness of coating decreases, the microwave absorbing properties and bandwidth for R_L < −10 dB of the composite absorbing materials increases at first and then decreases later, and the reflection loss peak gradually shifts to a higher frequency. When the mass fraction of graphene is 8%, the composite sample has a maximum reflection loss of −39.3 dB with a thickness of 1.4 mm at 14.48 GHz and the bandwidth reaches 3.28 GHz for R_L < −10 dB. The composite materials possess excellent absorption properties in the condition of thin coating thickness.