网格表面结构石膏基材料的电磁波吸收性能
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摘要
通过引入表面涂覆炭黑的吸波网格体,制备了具有网格表面结构的石膏基吸波平板材料,并采用弓形反射法研究了其在2~8 GHz频率范围内的吸波性能。结果表明:周期性网格表面结构的设计能够较好地改善石膏基平板材料的吸波性能,其电磁波反射率最小值可以达到–27 dB,反射率低于–10 dB的频带宽度达到4.2 GHz(3.8~8 GHz)。网格结构单元尺寸参数、其嵌入试样中的位置以及炭黑含量对吸波性能的影响显著。网格结构单元尺寸的减小以及炭黑含量的增加均能提高石膏基吸波平板的吸波性能;随着网格体从平板试样底部向表面移动,吸波性能逐渐增强,且反射吸收峰向低频方向移动。此外,网格表面结构的设计还能够显著改善石膏基平板材料的抗折性能。
Gypsum-based plates with carbon black(CB) coated a grid structure for electromagnetic wave absorption were prepared,and the wave absorption properties were investigated by an arch reflecting method at 2–8 GHz.The results indicate that the absorption properties of the wave absorbing gypsum-based plates can be improved by the introduction of the periodic grid structure.The minimum reflectivity value of the gypsum-based plates is –27 dB and the reflectivity can be less than –10 dB at 3.8–8 GHz.The grid size,the position of the grid mesh and the mass fraction of carbon black all have effects on the absorption properties.The absorption properties can be improved when the grid size is decreased or the CB mass fraction is increased.Also,the absorption properties increase and the absorption peaks shift to a lower frequency when the distance between the grid structure and the bottom of plate increases.The flexural strength of gypsum based plates can be enhanced by the improvement of grid structure design.
Gypsum-based plates with carbon black(CB) coated a grid structure for electromagnetic wave absorption were prepared,and the wave absorption properties were investigated by an arch reflecting method at 2–8 GHz.The results indicate that the absorption properties of the wave absorbing gypsum-based plates can be improved by the introduction of the periodic grid structure.The minimum reflectivity value of the gypsum-based plates is –27 dB and the reflectivity can be less than –10 dB at 3.8–8 GHz.The grid size,the position of the grid mesh and the mass fraction of carbon black all have effects on the absorption properties.The absorption properties can be improved when the grid size is decreased or the CB mass fraction is increased.Also,the absorption properties increase and the absorption peaks shift to a lower frequency when the distance between the grid structure and the bottom of plate increases.The flexural strength of gypsum based plates can be enhanced by the improvement of grid structure design.
引文
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[2]王振军,李克智,王闯,等.羰基铁粉-碳纤维水泥基复合材料的吸波性能[J].硅酸盐学报,2011,39(1):69–74.WANG Zhenjun,LI Kezhi,WANG Chuang,et al.J Chin Ceram Soc,2011,39(1):69–74.
[3]WANG Baomin,GUO Zhiqiang,HAN Yu,et al.Electromagnetic wave absorbing properties of multi-walled carbon nanotube/cement composites[J].Constr Build Mater,2013,46:98–103.
[4]YAO Rui,LIAO Songyi,DAI Changlu,et al.Preparation and characterization of novel glass-ceramic tile with microwave absorption properties from iron ore tailings[J].J Magn Magn Mater,2015,378:367–375.
[5]MITTRA R,CHAN C H,CWIK T.Techniques for analyzing frequency selective surfaces-a review[J].IEEE Proc,1988,76(12):1593–1615.
[6]ZHANG Jun,XIAO Peng,ZHOU Wei,et al.Preparation and microwave absorbing properties of carbon fibers/epoxy composites with grid structure[J].J Mater Sci:Mater Electron,2015,26:651–658.
[7]刘红英,孙维,冯一军,等.利用频率选择表面改善微波吸收材料S波段的吸波性能[J].微波学报,2006,22(3):10–13.LIU Hongying,SUN Wei,FENG Yijun,et al.J Microw(in Chinese),2006,22(3):10–13.
[8]何亮,王鹏起,谭丹君.石墨掺量对防电磁辐射纸面石膏板的影响[J].新型建筑材料,2016(1):1–3.HE Liang,WANG Pengqi,TAN Danjun.New Build Mater(in Chinese),2016(1):1–3.
[9]崔素萍,沈文婷,毛倩瑾,等.铁氧体-石膏基吸波复合材料及其制备方法[P].CN patent,201010554527.0.2010–11–19.CUI Suping,SHEN Wenting,MAO Qianjin,et al.Ferrite gypsum base absorbent composite materials and its preparation methods(in Chinese),CN patent,201010554527.0.2010–11–19.
[10]王鹏起,何亮,谭丹君,等.石墨粒径对防电磁辐射纸面石膏板的影响研究[J].建材科技,2015,19:87–89.WANG Pengqi,HE Liang,TAN Danjun,et al.Constr Sci Tech(in Chinese),2015,19:87–89.
[11]周永江,陈朝辉,程海峰,等.用FDTD方法研究颗粒型复合材料微波等效电磁参数[J].材料科学与工程学报,2006,24(6):830–834.ZHOU Yongjiang,CHEN Zhaohui,CHENG Haifeng,et al.J Mater Sci Eng(in Chinese),2006,24(6):830–834.
[12]贾宝福,刘述章,林为干.颗粒媒质等效电磁参数的研究[J].电子科学学刊,1990,12(5):503–511.JIA Baofu,LIU Shuzhang,LIN Weigan.J Electron(in Chinese),1990,12(5):503–511.
[13]LIU Weiwei,LI Hua,ZENG Qingping,et al.Fabrication of ultralight three-dimensional graphene networks with strong electromagnetic wave absorption properties[J].J Mater Chem A,2015,3:3739–3747.
[14]李红彬,孙志杰,陈淳.含碳纤维网格结构吸波复合材料的实验研究[J].玻璃钢/复合材料,2007,5:24-27.LI Hongbin,SUN Zhijie,CHEN Chun.Fiber Reinf Plast Compos(in Chinese),2007,5:24-27.
[15]邹田春,赵乃勤,师春生,等.含Minkowski活性碳毡电路屏复合材料的吸波性能研究[J].功能材料,2010,41(3):457–459.ZOU Tianchun,ZHAO Naiqin,SHI Chunsheng,et al.J Func Mater(in Chinese),2010,41(3):457–459.
[16]王沙沙,罗发,周万城,等.铁铬铝网栅吸波性能的研究[J].材料导报B:研究篇,2012,26(5):86–88.WANG Shasha,LUO Fa,ZHOU Wancheng,et al.Mater Rev B(in Chinese),2012,26(5):86–88.
[17]SU Jinbu,ZHOU Wangcheng,LIU Yi,et al.Effect of carbon black on dielectric and microwave absorption properties of carbon black/cordierite plasma-sprayed coatings[J].J Therm Spray Technol,2015,24(5):826–835.
[18]赵庆新,张津瑞,赵冉冉.炭黑掺量对水泥基材料微波吸收性能的影响及机理[J].硅酸盐学报,2011,39(12):2013–2020.ZHAO Qingxin,ZHANG Jinrui,ZHAO Ranran.J Chin Ceram Soc,2011,39(12):2013–2020.
[19]WU K H,TING T H,WANG G P,et al.Effect of carbon black content on electrical and microwave absorbing properties of polyaniline/carbon black nanocomposites[J].Polym Degrad Stab,2008,93:483–488.
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[21]崔素萍,王楠,郭红霞,等.硅藻土/镍锌铁氧体的制备及电磁性能[J].硅酸盐学报,2016,44(10):1509–1514.CUN Suping,WANG Nan,GUO Hongxia,et al.J Chin Ceram Soc,2016,44(10):1509–1514.
[22]XIE Shuai,JI Zhijiang,YANG Yang,et al.Electromagnetic wave absorption enhancement of carbon black/gypsum based composites filled with expanded perlite[J].Compos Part B,2016,106:10–19.