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采用柠檬酸络合物形成的溶胶凝胶制备了镍铁氧体,并将所得镍铁氧体与碳纳米管混合均匀,得到不同碳纳米管质量分数的复合材料。采用微波矢量网络分析仪测量了复合材料的电磁参数,根据电磁参数研究了1mm厚涂层在2~18GHz频段的微波反射率。结果表明:复合材料的吸波性能明显优于单纯的镍铁氧体材料,而且复合材料中碳纳米管含量对吸波性能有明显的影响。对于厚度为1mm的薄涂层,当碳纳米管的质量分数为20%时,涂层具有最优的吸波性能,最大吸收峰值达-14.02dB,小于-10dB的有效带宽达3GHz;然后通过电损耗功率密度分析了复合材料的微波吸收机理,并给出了厚度为1mm的薄涂层,当其中的碳纳米管含量为20%时,吸波效果最佳的理论解释。
Nickel ferrite was prepared by sol gel with citric acid complex, and the obtained nickel ferrite was mixed with carbon nanotubes uniformly to obtain composite materials with different carbon nanotube mass fractions. The electromagnetic parameters of the composites were measured by microwave vector network analyzer. The microwave reflectivity of 1mm thick coating in 2 ~ 18GHz band was studied based on the electromagnetic parameters. The results show that the microwave absorbing properties of the composites are obviously better than pure nickel ferrite materials, and the content of carbon nanotubes in the composites has a significant impact on the microwave absorbing properties. For a thin coating with a thickness of 1mm, when the mass fraction of carbon nanotubes is 20%, the coating has the best absorbing performance, the maximum absorption peak reaches -14.02dB, the effective bandwidth is less than -10dB up to 3GHz, and then passes Power Loss Power Density The mechanism of microwave absorption was analyzed and a thin coating with a thickness of 1 mm was given. When the content of carbon nanotubes was 20%, the absorbing effect was best explained theoretically.