球磨时间对FeSi合金吸波性能的影响

Effect of Milling Time on Microwave Absorbing Property of FeSi Alloy

采用湿法球磨对FeSi合金粉末进行片状化改性,利用扫描电子显微镜(SEM)、激光粒度分析仪、矢量网络分析仪对改性前后的FeSi粉末进行测试分析,研究不同球磨时间对FeSi粉末的形貌、粒径、电磁参数、吸波性能的影响。结果表明,随着球磨时间的延长,FeSi粉末的粒径逐渐减小,且扁平化程度增加。模拟反射率结果表明,当球磨时间为8h时,材料在测试频段内吸收值低于-15dB的频宽为2.8GHz,且在10.5GHz处达到最低吸收峰值-28.3dB。

FeSi powder was modified by wet milling with different milling time.The morphology,particle size,electromagnetic parameters and wave absorbing properties were characterized by scanning electron microscope(SEM),laser particle size analyzer and vector network analyzer,respectively.The results show that the average particle size of FeSi powder decrease and the level of flattening increase with the increase of milling time.The simulated reflectivity results show that when the milling time is 8 h,the bandwidth of the absorption value under-15 dB is 2.8 GHz,and the minimum absorption peak value at 10.5 GHz is-28.3 dB.