网格表面结构石膏基材料的电磁波吸收性能  

Electromagnetic Wave Absorption Properties of Gypsum-based Materials with Grid Structure

作　　者：解帅[1,2] 冀志江[1] 水中和[2] 李彬 侯国艳[1] 王静[1] 

机构地区：[1]中国建筑材料科学研究总院,绿色建筑材料国家重点实验室,北京100024 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐学报》2018年第1期156-162,共7页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2016YFC070090302)资助项目

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.

关 键 词：石膏 网格结构 电磁波吸收 反射率 

分 类 号：TU52[建筑科学—建筑技术科学] TB34[一般工业技术—材料科学与工程]