Electromagnetic Wave Absorption Properties of Cement Filled with Carbon Black

2014 ◽  
Vol 496-500 ◽  
pp. 2431-2434 ◽  
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Loss ◽  
Carbon Black ◽  
High Frequency ◽  
Filling Ratio ◽  
Frequency Range ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Testing Method ◽  
New Material

Using the dielectric loss property of carbon black , cement-based composites were prepared by introducing carbon black into cement. The reflection losses were studied using arched testing method in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency. The filling ratio of carbon black as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-10.6 dB was obtained at 18 GHz of 5wt.% carbon black filled cement with thickness of 20mm. The new material can be used for building indoor electromagnetic radiation protection.

Electromagnetic Wave Absorption Properties of Glass Fiber Reinforced Cement Filled with Carbon Black

2014 ◽  
Vol 912-914 ◽  
pp. 127-130 ◽  
Author(s):  
Yao Li Wei ◽  
Yue Fang Zhang ◽  
Wang Jun Hao
Keyword(s):  
Carbon Black ◽  
Electromagnetic Radiation ◽  
Glass Fiber ◽  
High Frequency ◽  
Frequency Range ◽  
Absorption Properties ◽  
Testing Method ◽  
Glass Fiber Reinforced ◽  
New Material ◽  
Reinforced Cement

In order to deal with the more and more serious problem of electromagnetic radiation pollution, cement-based composites were prepared by introducing glass fiber into cement as through wave reagent and carbon black as absorbing reagent . Arched testing method were used to test the reflection losses in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency compared with the pure cement. The filling ratio of carbon black and glass fiber as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-11.2 dB was obtained at 18 GHz of 9wt.% glass fiber and 5wt.% carbon black filled cement with thickness of 10mm. The new material can be used for building indoor electromagnetic radiation protection.

Double-Layered Cement Composites with Superior Electromagnetic Wave Absorbing Properties Containing Carbon Black and Expanded Polystyrene

2013 ◽  
Vol 774-776 ◽  
pp. 747-752 ◽  
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Bao Yi Li ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Black ◽  
High Performance ◽  
Expanded Polystyrene ◽  
Cement Composites ◽  
Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
Matching Layer ◽  
Layer Composite ◽  
New Material

This paper reported that, using the method of double layer composite successfully prepared high performance of electromagnetic wave absorption materials. Such a composite is composed of a cement matching layer filled with expanded polystyrene (EPS) beads and an absorbing cement layer made of EPS beads and carbon black. The samples were tested by arching method in the frequency range of 8~18GHz. The reflectivities were revealed to be excellent, the lowest being-17dB. The new material can be used for building indoor electromagnetic radiation protection.

Electromagnetic Wave Absorption Cement Based on Composited Absorbing Agent

2014 ◽  
Vol 1035 ◽  
pp. 520-523 ◽  
Author(s):  
Ye Sun ◽  
Yue Fang Zhang ◽  
Wan Jun Hao
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Black ◽  
Electromagnetic Radiation ◽  
Glass Fiber ◽  
Radiation Protection ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Electromagnetic Radiations

To solve more and more serious electromagnetic radiations, electromagnetic wave absorption cement were prepared by introducing carbon black and glass fiber as composited absorbing reagent, wich can be useful in building anechoic chamber and other electromagnetic radiation protection to buildings. The results showed that the absorption properties were improved compared with single absorbing agent such as carbon or glass fiber. the lowest reflection loss of-11.3dB was obtained at 18 GHz of 5wt.% carbon black and 9wt.% glass fiber filled cement with thickness of 20mm. The increase of thickness separately can not improve the absorption properties.

Dielectric Properties of PMN/CB/CIIR Composites

2009 ◽  
Vol 66 ◽  
pp. 234-237 ◽  
Author(s):  
Hao Yan ◽  
Zhi Xiong Huang ◽  
Yan Bing Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Carbon Black ◽  
Lead Titanate ◽  
High Frequency ◽  
Dielectric Constants ◽  
Frequency Range ◽  
Magnesium Niobate ◽  
Chlorobutyl Rubber

The Magnesium Niobate-Lead Titanate (PMN) / conductive carbon black (CB)/ chlorobutyl rubber(CIIR) composites were prepared by blending-vulcanization method, and the dielectric properties were studied. The results showed that the dielectric constant and dielectric loss of composites increased nonlinearly when increasing the content of PMN or CB. From the curve of dielectric constant vs frequency, it is obtained that in the frequency range from 103 to 106 Hz, the dielectric constant of PMN/CB/CIIR composites decreased with the frequency increasing and the dielectric constants are more stable under high frequency.

High-Throughput Thermal Plasma Synthesis of FexCo1-x Nano-Chained Particles with Unusually-High Permeability, and their Electromagnetic Wave Absorption Properties at High Frequency (1-26 GHz)

Nanoscale ◽  
2021 ◽  
Author(s):  
Min-Sun Jang ◽  
Mi Se Chang ◽  
Young-tae Kwon ◽  
Sangsun Yang ◽  
Jina Gwak ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
High Throughput ◽  
Reflection Loss ◽  
Thermal Plasma ◽  
High Frequency ◽  
Plasma Synthesis ◽  
High Permeability ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Thermal Plasma Synthesis

Herein, we introduce novel 1-dimensional nano-chained FeCo particles with unusually-high permeability prepared by a highly-productive thermal plasma synthesis, and demonstrate an electromagnetic wave absorber with exceptionally low reflection loss in...

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