Electromagnetic wave absorbing properties of cement-based composites doped with natural magnetite

被引：0

作者：

Guan, Bo-Wen ^{[1
]}

Ding, Dong-Hai ^{[2
]}

Xiong, Rui ^{[1
]}

Yang, Tao ^{[1
]}

Zhang, Ji-Yang ^{[1
]}

机构：

[1] Materials Science and Engineering, Chang'an University, Xi'an

[2] College of Materials and Mineral Resources, Xi'an University of Architecture and Technology, Xi'an

来源：

Gongneng Cailiao/Journal of Functional Materials | 2015年 / 46卷 / 02期

关键词：

Cement-based composites; Electromagnetic wave absorbing; Natural magnetite;

D O I：

10.3969/j.issn.1001-9731.2015.02.004

中图分类号：

学科分类号：

摘要：

The cement-based composites were fabricated using natural magnetite as low-cost absorbers. The complex permittivity and complex permeability of samples with different amount of natural magnetite powders were tested by the method of rectangular waveguide in the frequency of 8.2-12.4 GHz, and the reflection loss of samples were calculated based on the transmission line and impedance theory. The results show that the electromagnetic parameters of magnetite/cement composites are much higher than that of non-additive d cement. Magnetite/cement composites have two impedance thicknesses, 2.5 and 8.5 mm. The absorbing peak is moved to a lower frequency with increasing magnetite content. When the sample thickness is 2.5 mm, the sample consist of 15% magnetite show best absorbing performance; The bandwidth of reflection loss less than -10 dB is enlarged to 2.1 GHz with a peak value of -14.8 dB. However, when the sample thickness is 8.5 mm, the absorbing bandwidth is narrow. ©, 2014, Journal of Functional Materials. All right reserved.

引用

页码：02019 / 02022and02027

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