立方体α-Fe合成及其含量对吸波性能的影响

Synthesis of cube α-Fe and effect of its content on microwave absorption properties

为了研究形状各向异性与吸波剂含量对吸波性能的影响,利用溶剂热法成功制备了具有形状各向异性的立方晶形微纳米Fe粉.采用X射线衍射仪、扫描电子显微镜、X射线光电子谱等手段,对所制样品的微观结构、形貌与组成成分进行了研究.利用矢量网络分析仪研究了吸波剂含量对吸波性能的影响.结果表明,立方体状α-Fe的尺寸约为300 nm,其质量分数与微波吸收性能呈非线性增强关系.当α-Fe质量分数为50%时,反射损耗高达-48. 9 dB,频率为8. 78 GHz,对应的涂层厚度为2 mm,反射损耗小于-10 dB的频率范围为2. 04～18 GHz,对应的涂层厚度范围为1. 28～7 mm.

In order to study the effect of shape anisotropy and absorbent content on the microwave absorption properties,the cube micro/nano-Fe powders with shape anisotropy were successfully prepared with the solvothermal method.The microstructure,morphology and composition were researched with X ray diffractometer(XRD),scanning electron microscope(SEM)and X ray photoelectron spectroscopy(XPS).In addition,the effect of absorbent content on the microwave absorption properties was studied with the vector network analyzer.The results showthat the size of cubeα-Fe powders is about 300 nm,and the relationship between the mass fraction and microwave absorption properties is nonlinear enhancement.When the mass fraction ofα-Fe powders is 50%,the reflection loss achieves-48.9 dB at 8.78 GHz with the coating thickness of 2 mm.The frequency range with the reflection loss below-10 dB ranges from 2.04 GHz to 18 GHz,and the corresponding coating thickness is from 1.28 mm to 7 mm.