体积浓度对(Al_8Mn_5)_(95)Ni_5微粉/石蜡复合材料的微波吸收特性的影响

采用真空悬浮熔炼和高能球磨工艺制备(Al8Mn5)95Ni5微粉,并与石蜡按不同体积浓度制成复合材料,采用网络矢量分析仪研究(Al8Mn5)95Ni5微粉体积浓度对复合材料微波吸收特性的影响。结果表明:随着(Al8Mn5)95Ni5微粉体积浓度的增加,复合材料的ε″共振峰频率、μ″共振峰频率和反射损耗峰频率均向低频方向移动;涂层厚度为1.5 mm时,(Al8Mn5)95Ni5微粉体积浓度为30%的复合材料具有最小的反射损耗峰值(约为-34.98 d B)和很好的频宽效果;增加复合材料中(Al8Mn5)95Ni5微粉体积浓度,被吸波涂层表面反射回去的电磁波会增多。

Influence of Volume Concentration on Microwave Absorption Properties of (Al8Mn5)95Ni5 Powder/Paraffin Composites

In this study, （Al8Mn5）95Ni5 powder prepared by vacuum levitation melting and high-energyball milling, was composited with paraffin according to different volume concentration. Theeffects of （Al8Mn5）95Ni5 powder volume concentration on microwave absorbing properties of compositeswere studied with the help of network vector analyzer. Results show that, with the increase of（Al8Mn5）95Ni5 powder volume concentration, the ε″ formant frequencies, μ″ formant frequency andreflection loss peak frequency of the composites shift to the lower frequency. When the thicknessof the coating is 1.5 mm, the composite with 30% （Al8Mn5）95Ni5 powder has the minimum reflectionloss peak, which is about -34.98 dB, and a good bandwidth effect. With the increase of the（Al8Mn5）95Ni5 powder volume concentration in composite materials, the electromagnetic wavereflected by the absorbing coating will also increase.