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- 建筑石膏与胶凝材料
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三维界面特性双层水泥基材料的吸波性能研究
作者：李彬1，3，贾治勇2，陈春晖2，殷京玉2，冀志江1，王静1，解帅1
（1.中国建筑材料科学研究总院有限公司 绿色建筑材料国家重点实验室，北京 100024；
2.中国人民解放军空军研究院，北京 100068；3.北京三帝科技股份有限公司，北京 101312）
摘要：设计并制备了具有三维界面结构的双层水泥基吸波材料，利用弓形反射法研究了其在2~18 GHz频率范围内的电磁波吸收性能，研究了覆盖三维结构界面的透波层性质对吸波性能的影响。结果表明，三维界面结构设计能够显著提高水泥基材料的吸波性能、拓宽有效吸波带宽，具有尖劈界面结构的双层水泥基材料在2~18 GHz频率范围内电磁波反射率均低于-10 dB。三维界面结构双层水泥基材料的透波层中掺入0.5%炭黑即可导致在整个2~18 GHz频率范围内吸波性能的降低，减小透波层厚度可提高吸波性能，尤其对11~18 GHz高频波段吸波性能的提升更佳显著。
关键词：三维界面；层结构；水泥基吸波材料；反射率；宽频
中图分类号：TU528 文献标识码：A 文章编号：1001-702X（2022）01-0001-04
Study on electromagnetic wave absorbing properties of double layer cement-based materials with three-dimensional interface characteristics
LI Bin1，3，JIA Zhiyong2，CHEN Chunhui2，YIN Jingyu2，JI Zhijiang1，WANG Jing1，XIE Shuai1
（1.State Key Laboratory of Green Building Materials，China Building Materials Academy，Beijing 100024，China；2.PLA Air Force Academy，Beijing 100068，China；3.3D Printing Technology，Inc.，Beijing 101312，China）
Abstract：A double-layered cement-based wave absorbing material with three-dimensional interface structure was designed and prepared. The electromagnetic wave absorption performance was studied in the frequency range of 2~18 GHz using the arch reflection method. The effect of the wave-transparent layer covering the three-dimensional interface structure on the wave absorbing performance was investigated as well. The results show that the three-dimensional interface structure design can significantly improve the absorbing performance of cement-based materials and broaden the effective absorbing bandwidth. The reflectivity of electromagnetic wave of double-layer cement-based materials with wedge interface structure is lower than -10 dB in 2~18 GHz. Adding 0.5% carbon black into the wave-transparent layer of the double-layer cement-based material in the three-dimensional interface structure can decrease the wave absorption performance in the whole frequency range of 2~18 GHz. Reducing the thickness of the wave-transparent layer can improve the wave absorption performance，especially in the high frequency band of 11~18 GHz.
Key words：three-dimensional interface，layered structure，cement-based wave absorbing materials，reflectivity，broadband