scholarly journals Design and Performance Research on Dual Layer Cement Based Absorber Reinforced with Graphene Nanosheets and Manganese-zinc Ferrite

2021 ◽  
Author(s):  
Yafei SUN ◽  
Tianshu ZHOU ◽  
Yueyue PENG ◽  
Hongwei LIU
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Zinc Ferrite ◽  
Graphene Nanosheets ◽  
Effective Bandwidth ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
And Performance

Dual layer cement-based absorber is synthesized by mixing with graphene nanosheets and manganese-zinc ferrite, to study the effect of absorbing filler content on the mechanical properties, microstructure, electrical resistivity and reflectivity of the paste. The microstructure of the absorber is seen by Scanning Electron Microscope (SEM) images, Fourier Transform Infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD) curves of the absorber. The results show that graphene nanosheets significantly reduce the electrical resistivity of paste, increasing its mechanical properties by improving its pore structure. SEM images indicate that graphene nanosheets promote the increase and coarsening of cement hydration products and produce a large number of dense bulk crystals. Furthermore, reflectivity measurements show that the minimum reflectivity of – 14.1 dB is obtained in the range of 2 ~ 18 GHz and the effective bandwidth of 16 GHz is obtained when reflectivity is less than – 7 dB. This study provides a new method for the preparation of dual layer cement-based absorber.

Preparation and Electromagnetic Properties of Manganese Zinc Ferrite/Barium Ferrite Composite Materials

2012 ◽  
Vol 519 ◽  
pp. 215-219
Author(s):  
Quan Yuan ◽  
Wang Qun ◽  
Zhi Xue Qu ◽  
Zi Xin Gu ◽  
Tong Wu
Keyword(s):  
Composite Materials ◽  
Barium Ferrite ◽  
Zinc Ferrite ◽  
Spinel Phase ◽  
Electromagnetic Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite

Abstract: Manganese zinc ferrite/barium ferrite composite materials were prepared with various content of Z type barium ferrite (0, 10, 20 wt%) using solid state reaction method. The effect of the compositon on the microstructure and electromagnetic properties of the composites are investigated by means of X-ray diffraction, scanning electron microscope and impedance analyzer. The X-ray diffraction patterns reveal that W phase of barium ferrite instead of Z phase appears in the composite sintered as well as the spinel phase. Some small hexagonal grains were observed in the SEM images and the proportion increases with increasing content of barium ferrite. The cut-off frequencies of the composite systematically shift towards high frequency from 2.5 MHz to 32.6 MHz which is attributed to the increasing of W phase. The composites show a higher frequency for the maximum of the impedance as well as a higher value of the impedance at certain frequency which may be benefit for the application at GHz frequency range.

scholarly journals Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 616
Author(s):  
Ján Kruželák ◽  
Andrea Kvasničáková ◽  
Klaudia Hložeková ◽  
Rastislav Dosoudil ◽  
Marek Gořalík ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Zinc Ferrite ◽  
Mechanical Characteristics ◽  
Hybrid Composites ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
Frequency Range ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite

In the present work, composite materials were prepared by incorporation of manganese-zinc ferrite, carbon black and combination of ferrite and carbon black into acrylonitrile-butadiene rubber (NBR). For cross-linking of composites, standard sulfur-based curing system was applied. The main goal was to investigate the influence of the fillers on the physical-mechanical properties of composites. Then, the electromagnetic absorption shielding ability was investigated in the frequency range 1 MHz–3 GHz. The results revealed that composites filled with ferrite provide sufficient absorption shielding performance in the tested frequency range. On the other hand, ferrite behaves as an inactive filler and deteriorates the physical-mechanical characteristics of composites. Carbon black reinforces the rubber matrix and contributes to the improvement of physical-mechanical properties. However, composites filled with carbon black are not able to absorb electromagnetic radiation in the given frequency range. Finally, the combination of carbon black and ferrite resulted in the modification of both physical-mechanical characteristics and absorption shielding ability of hybrid composites.

scholarly journals A compact 5G antenna printed on manganese zinc ferrite substrate material

2016 ◽  
Vol 13 (11) ◽  
pp. 20160377-20160377 ◽  
Author(s):  
Ashiqur Rahman ◽  
Ng M. Yi ◽  
Afaz U. Ahmed ◽  
Touhidul Alam ◽  
Mandeep J. Singh ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Substrate Material ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
Ferrite Substrate

Effect of intragranular porosity of initial permeability and coercive force in a manganese zinc ferrite

1976 ◽  
Vol 11 (7) ◽  
pp. 1335-1338 ◽  
Author(s):  
G. C. Jain ◽  
B. K. Das ◽  
R. S. Khanduja ◽  
S. C. Gupta
Keyword(s):  
Coercive Force ◽  
Zinc Ferrite ◽  
Initial Permeability ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite
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