镀银织物基SiO_(2)@FCIP涂层复合材料的制备及电磁屏蔽性能

Preparation and electromagnetic shielding properties of silver-plated fabric-based SiO_(2)@FCIP coating composites

为增强材料对电磁波的屏蔽性能,同时降低电磁波二次反射带来的危害。基于电-磁损耗协同作用机理,将机械球磨与二氧化硅(SiO_(2))包覆双重改性的磁损耗材料羰基铁粉(CIP)与镀银织物复合,制备了结合吸收层和反射层的复合型电磁屏蔽织物。利用微观成像仪、X射线衍射仪、傅里叶红外光谱仪对改性CIP进行了物相表征,并通过同轴法和波导法对改性CIP以及复合织物的电磁参数与屏蔽效能进行了测试与分析。结果表明:双重改性后的羰基铁粉电磁波吸收损耗频带宽度增加且最佳反射损耗为-62.7dB;当涂层与基材整体厚度为3mm时,复合材料对电磁波的反射率(R)由0.96降至0.2,吸收率(A)由0.03增至0.82,实现了以吸收为主的屏蔽效果。

In order to enhance the shielding performance of material against electromagnetic wave and reduce the harms caused by the secondary electromagnetic wave reflection at the same time,based on the synergistic effect mechanism of electric-magnetic loss,compounding magnetic loss material carbonyl iron powder(CIP),which was modified by mechanical ball milling and coated with silica(SiO_(2)),with silver-plated fabric to prepare composite electromagnetic shielding fabric combining absorbing layer and reflecting layer.The phase characterization of the modified CIP was carried out by microscopic imager,XRD and FT-IR.The electromagnetic parameters and shielding efficiency of the modified CIP and composite fabric were tested and analyzed by coaxial method and waveguides method.The experimental results showed that the band width of electromagnetic wave absorption loss of the doubly modified carbonyl iron powder increased and the optimal reflection loss was-62.7dB.When the overall thickness of the coating and the substrate was 3mm,the reflectance(R)of the composite to electromagnetic wave decreased from 0.96 to 0.2,and the absorption rate(A)increased from 0.03 to 0.82,which realized the shielding effect dominated by absorption.