Fe-Si-Cr合金微粉吸波性能研究

Microwave absorbing property of Fe-Si-Cr alloy micropowders

为寻找新的吸波材料,以Fe、Si、Cr粉体为原料,采用机械合金化技术制备了Fe99-xSixCr(x=1,3,5,7)合金微粉。借助XRD、SEM和网络矢量分析仪等分析手段,研究了所制合金微粉的微结构及吸波性能。结果表明:在吸波涂层厚度为3.5mm时,Fe99-xSixCr合金微粉的吸收率随x的增大先减小后增加再减小,其中Fe94Si5Cr微粉的反射率最小。随吸波涂层厚度的增加,Fe94Si5Cr合金微粉的最小反射率点由高频向低频移动,并且反射率逐渐降低;当涂层厚度为4.0mm时,Fe94Si5Cr合金微粉的反射率达到极值,即在4.04GHz处达到最小值-42.5dB。

In order to get a new kind of microwave absorbing material,Fe99-xSixCr alloy micropowders were prepared using the mechanical alloying technique with Fe,Si and Cr powders as raw materials.The microstructure and microwave absorbing property of the prepared alloy micropowders were studied by XRD、SEM and vector network analyzer.The results show that,when the microwave absorbing coating prepared from Fe99-xSixCr micropowders are 3.5mm thick,the absorbance of the coating decreases first,then increases and then decreases with increasing x value,with coating made from Fe94Si5Cr micropowder showing the lowest reflectivity.For the microwave absorbing coating prepared from Fe94Si5Cr micropowder,the valley of the reflectivity curve of coating shifts to lower frequency while the reflectivity of coating decreases with increasing coating thickness,and the reflectivity of this kind of coating reaches the lowest value of-42.5 dB at 4.04 GHz when the coating is 4mm thick.