吸收剂复合改性对材料电磁性能的影响
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摘要
采用硅烷偶联剂对W型铁氧体类吸收剂和F型铁氧体类吸收剂进行复合改性,通过扫描电镜(SEM)研究偶联剂改性对吸收剂微观结构的影响,分析复合改性对吸波材料电磁性能的影响,并通过有效媒质理论(effective medium theory)讨论吸收剂电磁参数理论值与实际值的差异。结果表明:通过吸收剂复合改性可以实现复合吸波材料的电磁性能调整,实现材料宽带匹配,提高吸波材料吸收效率;改性后的吸波材料在8～18 GHz时反射率小于–10 dB,最小反射值可达–14.5 dB,附着力为6.32 MPa;耐热性能实验后,吸波材料外观和反射率无明显变化,说明复合改性后吸波材料耐环境性能优异。
Coupling agent is one of the most common surface modifiers which is widely used in the field of absorbing material.Modification of absorbing material by coupling agent is the research hotspot. Herein, the absorbing material was prepared and modified by two kinds of absorbents(Ba(Zn1-x Cox)2 Fe16 O27 and CIP) and AMEO coupling agent. The effect of absorbent modification on the macrostructure of absorbents was investigated by SEM. The electromagnetic properties of Ba(Zn1-x Cox)2 Fe16 O27 and CIP were tested and discussed in detail. The difference between theoretical value and actual value of electromagnetic properties of absorbers was discussed by effective medium theory. The experimental results show that the absorbent modification can adjust the electromagnetic properties of absorbing material. The reflectivity of absorbing material after the modification is less than –10 dB in the range of 8 GHz to 18 GHz, and showes a minimum reflection of –14.5 dB. Furthermore, the absorbing material has a higher tensile strength(6.32 MPa). After the test of resistance to environment, no obvious changes are appeared from the absorbing material, reflectivity and adhesive force. The absorbing material has a good property of resistance to environment.
Coupling agent is one of the most common surface modifiers which is widely used in the field of absorbing material.Modification of absorbing material by coupling agent is the research hotspot. Herein, the absorbing material was prepared and modified by two kinds of absorbents(Ba(Zn1-x Cox)2 Fe16 O27 and CIP) and AMEO coupling agent. The effect of absorbent modification on the macrostructure of absorbents was investigated by SEM. The electromagnetic properties of Ba(Zn1-x Cox)2 Fe16 O27 and CIP were tested and discussed in detail. The difference between theoretical value and actual value of electromagnetic properties of absorbers was discussed by effective medium theory. The experimental results show that the absorbent modification can adjust the electromagnetic properties of absorbing material. The reflectivity of absorbing material after the modification is less than –10 dB in the range of 8 GHz to 18 GHz, and showes a minimum reflection of –14.5 dB. Furthermore, the absorbing material has a higher tensile strength(6.32 MPa). After the test of resistance to environment, no obvious changes are appeared from the absorbing material, reflectivity and adhesive force. The absorbing material has a good property of resistance to environment.
引文
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[24]SONG W L,YUAN J,HOU Z L,et al.Modeling and computing example for effective electromagnetic parameters of multiphase composite media[J].Chinese Physics Letters,2009,26(5):057702.
[2]HUANG D Q,KANG F Y,ZHOU Z H,et al.An'H'-shape three-dimensional meta-material used in honeycomb structure absorbing material[J].Applied Physics A,2015,118(3):1099-1106.
[3]HUANG D Q,KANG F Y,DONG C L,et al.A secondorder cross fractal meta-material structure used in lowfrequency microwave absorbing materials[J].Applied Physics A,2014,115(2):627-635.
[4]NEDKOV I,PETKOV A,KAZPOV V.Microwave absorption in Sc and co-Ni substituted Ba-hexaferrite powders[J].IEEE Transactions on Magnetics,1990,5(5):1483-1484.
[5]CAO M S,QIN R R,QIU C J,et al.Matching design andmismatching analysis towards radar absorbing coatings based on conducting plate[J].Materials and Design,2003,24:391-396.
[6]CAO M S,HAN C,WANG X X,et al.Ultrathin graphene:electrical properties and highly efficient electromagnetic interference shielding[J].J Mater Chem C,2018,6:4 586-4602.
[7]CAO M S,WANG X X,CAO W Q,et al.Graphene nanohybrids:excellent electromagnetic properties for the absorbing and shielding of electromagnetic waves[J].J Mater Chem C,2015,3:6589-6599.
[8]赵宏杰,宫元勋,邢孟达,等.结构吸波材料多层阻抗渐变设计及应用[J].宇航材料工艺,2015(4):19-22.(ZHAO H J,GONG Y X,XING M D,et al.Design and application of multilayer graded impedance in structural radar absorbing materials[J].Aerospace Materials&Technology,2015(4):19-22.)
[9]黄大庆,康飞宇,周卓辉,等.微波低通高阻复合材料构件的设计与性能验证[J].物理学报,2015,64(18):188401.(HUANG D Q,KANG F Y,ZHOU Z H,et al.Design and verification of microwave low frequency band-pass and high frequence band-stop composite structure[J].Acta Physica Sinica,2015,64(18):188401.)
[10]刘凌云,胡长寿,郭彪.超材料吸波体吸波特性研究[J].材料导报,2010,24(5):1-18.(LIU L Y,HU C S,GUO B.Research on absorbing properties of metamaterial absorber[J].Materials Review,2010,24(5):1-18.)
[11]程红飞,黄大庆.多频谱兼容隐身材料研究进展[J].航空材料学报,2014,34(5):93-99.(CHENG H F,HUANG D Q.Research progress in multi-spectrum compatible stealth materials[J].Journal of Aeronautical Materials,2014,34(5):93-99.)
[12]何山,李业华,周淳.一种多层胶板雷达吸波材料[J].航空材料学报,2016,36(4):41-46.(HE S,LI Y H,ZHOU C.A multilayer rubber board radar absorbing material[J].Journal of Aeronautical Materials,2016,36(4):41-46.)
[13]齐宇,何山,史有强.防腐蚀型宽频带雷达吸波涂料研究[J].航空材料学报,2014,34(5):75-80.(QI Y,HE S,SHI Y Q.Anti-corrosion type radar absorbing coating[J].Journal of Aeronautical Materials,2014,34(5):75-80.)
[14]周远良,赛义德,张黎,等.树脂基Fe纳米粒子及碳纤维复合吸波平板的制备与性能[J].材料工程,2018,46(3):41-47.(ZHOU Y L,SAI Y D,ZHANG L,et al.Preparation and performance of resin-based fe nanoparticles/carbon fibers microwave absorbing composite plates[J].Journal of Materials Engineering,2018,46(3):41-47.)
[15]赵晓明,刘元军.铁氧体/碳化硅/石墨三层涂层复合材料介电性能[J].材料工程,2017,45(1):33-37.(ZHAO X M,LIU Y J.Dielectric properties of ferrite/silicon carbide/graphite three-layer composite coating materials[J].Journal of Materials Engineering,2017,45(1):33-37.)
[16]ZHAO Y,CAO X,GAO J,et al.Broadband radar absorbing material based on orthogonal arrangement of csrr etched artifinial magnetic conductor[J].Micro-wave and Optical Technology Letters,2014,56(1):158-161.
[17]LIU Y S,HUANG X,GUO P P,et al.Skin collagen fiber-based radar absorbing materials[J].Chinese Sni Bull,2011,56(2):202-208.
[18]ZHOU P,HUANG L,XIE J,et al.A study on the effective permittivity of carbon/PI honeycomb composites for radar absorbing design[J].IEEE Transactions on Antennas and Propagation,2012,60(8):3679-3683.
[19]班国东,刘朝辉,丁逸栋,等.羰基铁粉/纳米铁粉复合吸波涂层的频散特性[J].后勤工程学院学报,2016,32(2):58-61.(BAN G D,LIU C H,DING Y D,et al.Dispersive characteristics on carbonyl iron powder/nano-sized iron powder composite absorbing coatings[J].Journal of Logistical Engineering University,2016,32(2):58-61.)
[20]班国东,刘朝辉,叶圣天,等.镍铁合金/铁包云母粉复合吸波涂层材料的频散特性[J].装备环境工程,2017,14(3):95-100.(BAN G D,LIU C H,YE S T,et al.Dispersion properties on nickalloy/iron package mica powder composite absorbing coatings[J].Equipment Environmental Engineering,2017,14(3):95-100.)
[21]高正娟,曹茂盛,朱静.复合吸波材料等效电磁参数计算的研究进展[J].宇航材料工艺,2004,34(4):12-15.(GAO Z J,CAO M S,ZHU J.Development in study of effective electromagnetic parameters of absorbing composite[J].Aerospace Materials&Technology,2004,34(4):12-15.)
[22]曹茂盛,高正娟,邹桂真,等.超细颗粒/环氧体系电磁参量的计算及数值模拟[J].航空材料学报,2004,24(3):15-20.(CAO M S,GAO Z J,ZOU G Z,et al.Computation simulation of EM parameters of LDT-epoxy disperse systems[J].Journal of Aeronautical Materials,2004,24(3):15-20.)
[23]HUANG Y Q,HOU Z L,SONG W L,et al.Electromagnetic parameters model and microwave absorption for composite coatings containing magnetic particles[J].Chinese Physics Letters,2009,26(5):057701.
[24]SONG W L,YUAN J,HOU Z L,et al.Modeling and computing example for effective electromagnetic parameters of multiphase composite media[J].Chinese Physics Letters,2009,26(5):057702.