活性炭负载Co0.8Zn0.2Fe2O4铁氧体的制备及电磁性能研究

摘要

A novel activated carbon loaded with cobalt-zinc ferrite composite wave-absorbing materials was prepared by sol-gel method.The cobalt zinc ferrite sol was synthesized with citric acid as complexing reagent,and the ferrite and activated carbon composite gel was obtained by vaporization treatment,then the activated loaded with cobalt-zinc ferrite composite was prepared by calcination of the gel.The effect of process parameters such as the sintering temperature,sintering time and ratio of carbon/ferrite on the morphology and structure of composite was studied in detail,in which the morphology,structure and compose of composite were characterized by scanning electron microscopy（SEM）,elements X-ray diffraction（XRD） and energy dispersive X-ray fluoresence spectrometer（EDX）.Furthermore,the complex permittivity and permeability of the as-prepared composites were characterized in the frequency ranges of 8.2-12.4GHz by the wave-guide method on the vector network analyzer,in which the higher electrical and magnetic loss tangent of the activated loaded with cobalt-zinc ferrite composite were obtained.%采用溶胶-凝胶法制备活性炭负载纳米钴锌铁氧体复合吸波材料研究。以柠檬酸为络合剂制备Co0.8Zn0.2Fe2O4铁氧体溶胶,加入活性炭于溶胶中,经浓缩制得活性炭/钴锌铁氧体凝胶,再经过低温煅烧,制备出形态和结构理想的活性炭负载钴锌铁氧体复合材料;详细地考察烧结温度、煅烧时间及活性炭与铁氧体的配比等工艺参数对复合材料的形态和结构的影响;分别采用X射线衍射（XRD）、扫描电镜（SEM）和能量散射X射线荧光光谱（EDX）对制备出的复合材料进行形貌、结构及组成表征分析。采用波导法在8.2～12.4GHz波段对活性炭负载纳米钴锌铁氧体复合材料进行电磁参数测试分析,结果表明所制备活性炭负载纳米钴锌铁氧体复合材料具有较高的电、磁损耗角正切值,其吸波性能较好。