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Vol. 26 No. 17 (2014): Vol 26 Issue 17

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Electromagnetic Wave Absorbing Properties of Double-Layer Cement Composite and Theory Analysis

https://doi.org/10.14233/ajchem.2014.18155
Yuefang Zhang
School ofMaterials and Engineering, Dalian University of Technology, Dalian 116085, P.R. China; School of Materials Science and Chemical Engineering, Hainan University, Haikou 570228, P.R. China
Wanjun Hao
School of Materials Science and Chemical Engineering, Hainan University, Haikou 570228, P.R. China
Baoyi Li
The 33st Institute of China Electronics Technology Group Corporation, Taiyuan 030002, P.R. China
Yuping Duan
School ofMaterials and Engineering, Dalian University of Technology, Dalian 116085, P.R. China
Shunhua Liu
School ofMaterials and Engineering, Dalian University of Technology, Dalian 116085, P.R. China

Corresponding Author(s) : Wanjun Hao

hwj8899@163.com

Asian Journal of Chemistry, Vol. 26 No. 17 (2014): Vol 26 Issue 17

Abstract

In this paper, we have developed double-layer cement matrix composites by using impedance matching design. Expanded polystyrene beads were used as an electromagnetically transparent material in the composites. The composites’ electromagnetic wave absorption properties (filled with carbon black, manganese dioxide and Ni-Zn ferrite at 2.6-18 GHz) were examined. The results showed that the expanded polystyrene beads significantly improved the impedance matching characteristics between the composites and the free space and the scattering properties of expanded polystyrene beads contributed to further wave attenuation. We further optimized the cement matrix’s absorption properties by altering the ratios of fillers, absorbent types and specimen thicknesses. A maximum absorption of -22.3 dB at 4.8 GHz (bandwidth 11.4 GHz, < -10dB) was achieved under the following conditions: matching layer of 60 vol % expanded polystyrene and 4 vol % ferrite, absorbing layer of 50 vol % expanded polystyrene and 6 vol % carbon black and a specimen thickness of 20 mm.

Keywords

Cement matrix composites Absorption properties and components Electromagnetic transparent materials Double-layer
Zhang, Y., Hao, W., Li, B., Duan, Y., & Liu, S. (2014). Electromagnetic Wave Absorbing Properties of Double-Layer Cement Composite and Theory Analysis. Asian Journal of Chemistry, 26(17), 5563–5566. https://doi.org/10.14233/ajchem.2014.18155
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