混合型吸波涂层对电磁屏蔽织物吸波性能的影响

Effect of hybrid absorbing coating on microwave absorbing properties of electromagnetic shielding fabric

为了满足对高性能电磁屏蔽织物的需求,针对采用单一种类吸波型涂层提高屏蔽效能的方法难以满足宽频带要求且吸波性能不高,采用碳纳米管、石墨烯、铁氧体和纳米镍粉,运用分析天平、恒温磁力搅拌器、电热恒温鼓风干燥箱等设备制得实验涂层(设置其混合含量为15%、25%和35%)。运用DR-RO1反射率高精度测试系统对不锈钢电磁屏蔽织物涂层进行反射率测试。实验得出:频段为1 000~18 000 MHz,在相同混合材料,不同含量的对比实验中,含量为35%石墨烯+碳纳米管组合的混合涂层反射率最佳。相同含量、不同混合材料的对比实验中,碳纳米管+石墨烯组合的涂层反射率最佳,随着混合吸波材料含量的升高,其最佳反射率值的频宽在一定范围内得到了拓宽。为研究混合型吸波涂层电磁屏蔽服装在不同频宽的设计、材料的含量提供参考。

In order to meet the requirements of high performance electromagnetic shielding fabrics,absorbing coatings was applied to improve the effectiveness of shielding.However,it is difficult for a single type of absorption layer to meet the requirements of wide frequency due to the low absorbing performance.In this paper,carbon nanotubes,graphene,ferrite and nano-nickel powder were used,and the experimental coatings were obtained.Reflectivity testing on stainless steel electromagnetic shielding fabric coatings was performed by the DR-RO1 reflectivity high precision test system.The results showed that under the frequency range of 1 000-18 000 MHz,the mixed coating with a combination of 35%graphene and carbon nanotubes has the best reflectivity.With the same content and different mixed materials,the combination of carbon nanotubes and graphene has the best reflectivity.The reflective value increased with the content of the mixed absorbing material and the bandwidth of the optimum reflectivity is broadened within a certain range.The results were helpful for the research of hybrid absorbing coating electromagnetic shielding garments in different bandwidth design and material content.