将导电炭黑分散在环氧树脂体系中,采用浸渍法制备出炭黑含量和浸渍次数不同的蜂窝吸波材料,通过弓形法测试其在4～18GHz和26.5～40GHz的吸波性能,入射电磁波在具有吸波性能的蜂窝内壁之间进行多次反射、吸收,从而实现材料对电磁波的宽频带吸收。通过实验分析了蜂窝吸波材料在不同波段的反射率变化趋势以及频带宽、覆盖率等,对比了炭黑含量、芳纶纸蜂窝芯厚度不同的蜂窝吸波材料的吸波性能。结果表明:随着炭黑含量和浸渍次数的增加,在芳纶纸蜂窝上附着的炭黑含量逐渐升高,吸波性能先持续提高,炭黑含量达到一定值后吸波性能下降,随着芳纶纸蜂窝芯厚度的增加,炭黑质量分数为20%、浸渍次数为3次和4次的吸波材料在4～18GHz吸波性能均有不同程度的提高,宽频吸收效果好,芳纶纸蜂窝芯最佳厚度为4mm;随着芳纶纸蜂窝芯厚度的增加,炭黑质量分数为20%、浸渍次数为3次的吸波材料在26.5～40GHz吸波性能均下降,芳纶纸蜂窝芯最佳厚度为2mm。
Conductive carbon black was dispersed in an epoxy resin system,and honeycomb absorbing materials with varying carbon black contents and impregnation times were prepared by impregnation method.The wave absorbing performance of the honeycomb materials at 4～18GHz and 26.5～40GHz was tested by the bow method.Incident electromagnetic waves were reflected and absorbed between the honeycomb walls with the wave absorbing performance for many times,achieving the materials' wide bandwidth absorption for electromagnetic waves.The reflectance trend,frequency bandwidth and coverage rate of honeycomb absorbing materials in different wave bands were analyzed by experiments,and the absorption properties of honeycomb absorbing materials with different carbon black contents and thicknesses were compared.The results showed that with the increase of carbon black content and impregnation times,the carbon black content attached to the aramid paper honeycomb gradually increased,the wave absorption performance was continuously improved at first,and the wave absorption performance decreased after the carbon black content reached a certain value.The absorbing properties of the materials with carbon black mass fraction of 20% and impregnation times of 3 and 4 were improved in different degrees at 4～18GHz,and the broadband absorption effect was good.The optimal thickness of the aramid paper honeycomb core was 4mm.With the increase of aramid honeycomb core thickness,the absorption performance of the materials with 20% carbon black mass fraction and 3 impregnation times decreased at 26.5～40GHz,and the optimal thickness of aramid honeycomb core was 2mm.
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