摘要
利用熔融沉积成型技术快速制备了石墨烯/聚乳酸复合材料和四氧化三铁/聚乳酸复合材料,测试了其电磁参数,并基于传输线理论计算模拟分析了石墨烯含量对其吸波性能的影响,进而确定了透波层、吸收层、再次吸收层的匹配材料和厚度范围,制造了石墨烯/纳米四氧化三铁吸波体。磁/电介质多孔结构型吸波体的测试结果表明:在X和Ku波段内实现了-8 dB吸收,反射率小于-10 dB的频宽达6.7 GHz,最大吸收峰值在14.2 GHz时达到-33 dB。研究发现,通过改变吸收层材料组成及其结构可以获得更好的吸波性能,周期性的多孔结构的存在可以使更多的电磁波进入复合材料内部,同时增加了吸收界面数量;此外,石墨烯和纳米四氧化三铁的组合使介电损耗与磁损耗之间产生了有效的互补,也增加了吸波性能。
The graphene/polylactic acid composite and Fe3O4/polylactic acid composite were prepared rapidly by means of fused deposition molding technology,and their electromagnetic parameters were tested.The influence of graphene content on their absorbing properties was simulated and analyzed based on the theoretical transmission line,and then the matching material and thickness range of the identified through wave layer,the absorption layer and the reabsorbing layer were determined to make the graphene/nano Fe3O4 absorber.The test results of the magnetic/electric porous structure absorber show that the-8 db absorption is achieved in the X and Ku bands,the reflectivity is less than-10 dB and the frequency width is up to 6.7 GHz,and the maximum absorption peak reaches-33 dB at 14.2 GHz.It is found that the better absorbing performance can be achieved by changing the composition and structure of the absorbing layer,and the presence of periodic porous structure can allow more electromagnetic waves to enter the composites and increase the number of absorbing interfaces.In addition,the combination of graphene and nanocrystalline Fe3O4 produces effective complementarity between dielectric loss and magnetic loss,and also increases the absorbing property of the composites.
作者
吴海华
刘力
蔡宇
张成
邢垒
李亚峰
胡正浪
钱鹏
WU Hai-hua;LIU Li;CAI Yu;ZHANG Cheng;XING Lei;LI Ya-feng;HU Zheng-lang;QIAN Peng(College of Mechanical&Power Engineering,China Three Gorges University,Yichang 443002,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第5期34-41,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51575313)
西安交通大学机械制造系统工程国家重点实验室开放课题研究基金(sklms2018001)
湖北省技术创新专项重大项目(2019AAA164)。
关键词
磁/电介质多孔结构型
石墨烯
熔融沉积成型
吸波性能
porous magnetic/dielectric absorbers
graphene
fused deposition modeling
microwave absorption performance
