吸收型锰锌铁氧体/二氧化硅电磁屏蔽复合材料的性能研究  

Study on the Absorption Dominant Electromagnetic Interference Shielding Properties of Manganese Zinc Ferrite/Silica Composites

作　　者：林叶红 王丽丽 黄志高 LIN Yehong;WANG Lili;HUANG Zhigao(College of Physics and Energy,Fujian Normal University,Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials,Fuzhou 350117,China;Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage,Fuzhou 350117,China;Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices,Xiamen 361005,China)

机构地区：[1]福建师范大学物理与能源学院福建省量子调控与新能源材料重点实验室,福建福州350117 [2]福建省太阳能转换和储能工程技术研究中心,福建福州350117 [3]福建省半导体光电材料及其高效转换器件协同创新中心,福建厦门361005

出　　处：《福建师范大学学报（自然科学版）》2020年第2期61-69,共9页Journal of Fujian Normal University：Natural Science Edition

基　　金：国家自然科学基金面上基金资助项目(61574037);福建省科技厅青年创新项目(2016J05117)。

摘　　要：通过静电吸附的方法制备了Mn0.6Zn0.4Fe2O4/SiO2(MZFO/SiO2)复合粉体,并使用放电等离子烧结(SPS)方式将其烧结成MZFO/SiO2复合材料,表征了复合材料的形貌、结构、导电性和磁性,通过电磁参数分析了复合材料的电磁屏蔽性能.900℃和1 000℃烧结的MZFO/SiO2复合材料(厚度2.0 mm)在Ku波段的平均电磁波总屏蔽效能分别达到22.30 d B和22.40 d B.高的介电损耗使1 000℃烧结的MZFO/SiO2复合材料表现出了最好的屏蔽性能;而高的饱和磁化强度、矫顽力和电导率也使900℃烧结的MZFO/SiO2复合材料表现出了良好的屏蔽性能.复合材料的吸收屏蔽效能SEA大于反射屏蔽效能SER,且反射系数R只有0.6左右,因此MZFO/SiO2复合材料是以吸收屏蔽为主的具有相当潜力的电磁屏蔽材料.In this study,Mn0.6Zn0.4Fe2O4/SiO2(MZFO/SiO2) powder was prepared by electrostatic attraction and then sintered by Spark plasma sintering method(SPS) to obtain the MZFO/SiO2 composites.The morphology,structure,electrical conductivity and magnetic properties of the composites were characterized.The electromagnetic shielding performance of the composites were analyzed through the electromagnetic parameters.The average total shielding efficiency of the composted(2.0 mm thickness) sintered at 900 ℃ and 1 000 ℃ were 22.30 d B and 22.40 dB in Ku band.The composite sintered at 1 000 ℃ showed the best electromagnetic shielding performance for the highest dielectric loss.The composite sintered at 900 ℃ also showed good electromagnetic shielding performance for its high saturation magnetization,coercivity and electrical conductivity.The shielding effect of the composites sintered at 900 ℃ and 1 000 ℃ mainly came from absorption since the values of SEAwere larger than SER.The reflection coefficients R were also as low as about 0.6.The high SEAand R indicate that the composite is a kind of potential absorbing electromagnetic shielding material which can effectively reduce electromagnetic interference with the surroundings.

关 键 词：吸收型电磁屏蔽 锰锌铁氧体 二氧化硅 放电等离子烧结 

分 类 号：TB34[一般工业技术—材料科学与工程]