C/Co核壳亚微米复合物的吸波性能  

Microwave Absorption Properties of Submicro-composites of Core-shell C/Co

作　　者：王晓磊[1] 包秀坤 关银燕[1] 徐舸[1] 

机构地区：[1]沈阳工业大学理学院,沈阳110870

出　　处：《材料研究学报》2017年第4期241-247,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51601120);沈阳市科技局(F15-163-4-00);辽宁省教育厅(L2015396)资助~~

摘　　要：采用液相合成和后续的热处理工艺制备钴包碳的C/Co核壳亚微米复合物,研究了复合物的吸波性能。结果表明:热处理使C/Co核壳亚微米复合物的结晶性增强,使形貌由C/Co-雪花片壳层的核壳结构转变为C/Co-壳层闭合的核壳结构,饱和磁化强度提高而矫顽力降低。C/Co壳层闭合的核壳亚微米复合物(50%,质量分数)-石蜡的吸波样品具有优异的吸波性能,在11 GHz处最小反射损耗为-23 d B,厚度为2.5 mm,单层厚度的吸波频带(RL<-10 d B)达到3 GHz。随着吸波样品厚度的增大吸收峰向低频移动,并出现多重吸收峰。C/Co核壳亚微米复合物优异的吸波性能,可归因于较好的阻抗匹配、介电损耗和1/4波长干涉相消原理。Submicro-composites of core-shell C/Co were synthesized by a two step process of liquid synthesis and heat treatment with C as core- and Co as shell-material, and then their microwave absorption properties were investigated. Results show that the heat treatment process can enhance the crystallinity of the prepared C/Co-composites and alter their morphology, i.e. transforming from a core/ shell structure with snowflak like shell to a core/shell structure with enclosed shell. Meanwhile, their saturation magnetization of increases while coercivity decreases. Finally a mixture of the prepared C/Co- composite with paraffin （50%, mass fraction） show excellent microwave absorption property i.e. a layer of such mixture of 2.5 mm in thickness exhibits a minimum reflection loss （RL） of-23 dB at 11 GHz ,and an effective bandwidth （RL〈-10 dB） of 3 GHz. With the increase of layer thickness, the absorption peak shifts gradually to low frequencies and multiple-absorption peaks emerge. The excellent microwave absorption properties may be attributed to the better impedance matching, dielectric loss and quarter-wavelength interference cancellation etc..

关 键 词：复合材料 微波吸收性能 热处理 C/Co核壳亚微米复合物 

分 类 号：TB34[一般工业技术—材料科学与工程]