形貌对羰基铁/Fe-Si-Cr复合材料吸波性能的影响  

Effect of morphology on microwave absorption properties of carbonyl iron/Fe-Si-Cr composites

作　　者：金丹[1] 杜雨果 杨晓龙 JIN Dan;DU Yuguo;YANG Xiaolong(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《哈尔滨工业大学学报》2022年第6期95-104,共10页Journal of Harbin Institute of Technology

基　　金：陕西省教育厅专项科研计划(18JK0446)。

摘　　要：为有效提升吸波材料的电磁吸收强度和有效吸收带宽,采用球磨法对球状Fe-Si-Cr进行扁平化处理,通过机械共混法将不同形貌Fe-Si-Cr和羰基铁粉(Carbonyl iron powder,CIP)复合,研究不同质量比对复合材料电磁参数和微波吸收性能的影响。实验结果表明,大长径比可以提高材料的介电常数和磁导率,并使反射率峰值向低频移动。片状Fe-Si-Cr和CIP的低频吸波性能优于球形粒子。实验制备的复合材料中,样品I的最大反射损耗为-45.92 dB,有效吸收带宽为1.5 GHz。样品L的最大反射损耗为-22.11 dB,有效吸收带宽大于6.2 GHz。吸波剂的形貌对材料的电磁吸收性能有显著影响。将不同形貌的CIP和Fe-Si-Cr按不同配比复合后,可以得到不同频率下性能优良的吸波体。利用阻抗匹配函数可以从理论上预测出反射损耗峰值对应的吸波剂厚度和频率。双层吸波材料相比于单层吸波材料,其有效吸收带宽更大,可以通过改变匹配层、吸收层的厚度来获得不同频率下吸波性能优良的吸波体,更易满足新型吸波材料“薄、轻、宽、强”的要求。To effectively improve the electromagnetic absorption strength and effective absorption bandwidth of absorbing materials,the spherical Fe-Si-Cr was flattened by ball milling,and carbonyl iron powder(CIP)with different morphologies was compounded with Fe-Si-Cr by mechanical blending method.The effects of mass ratio on the electromagnetic parameters and microwave absorption properties of the composites were studied.Experimental results show that high aspect ratio could improve the dielectric constant and permeability of the material,and make the reflectivity peak shift to low frequency.The low-frequency absorption properties of flaky Fe-Si-Cr and CIP were better than those of spherical particles.Among the composite materials prepared in the experiment,the maximum reflection loss of sample I was-45.92 dB,and the effective absorption bandwidth was 1.5 GHz.The maximum reflection loss of sample L was-22.11 dB,and the effective absorption bandwidth was greater than 6.2 GHz.The morphology of the absorber had a significant influence on the electromagnetic absorption performance of the material.After compounding different morphologies of CIP and Fe-Si-Cr according to different proportions,absorbers with excellent performance at different frequencies were obtained.The impedance matching function could theoretically predict the thickness and frequency of the absorber corresponding to the peak of the reflection loss.Compared with single-layer absorbing materials,the effective absorption bandwidth of double-layer absorbing materials was larger,and the absorbers with excellent absorbing properties at different frequencies could be obtained by changing the thickness of matching layer and absorption layer,which can easily meet the requirements of new absorbing materials of“thin,light,wide,and strong”.

关 键 词：复合材料 Fe-Si-Cr 羰基铁 双层 吸波性能 

分 类 号：TB34[一般工业技术—材料科学与工程]