scholarly journals Screens for Protection Against Electromagnetic Radiation

2020 ◽  
Vol 9 (3) ◽  
pp. 2398-2402
Keyword(s):  
Carbon Black ◽  
Sheet Metal ◽  
Electromagnetic Fields ◽  
Experimental Methods ◽  
Comparison Analysis ◽  
Frequency Range ◽  
Carbon Filler ◽  
Metal Shield ◽  
Metal Sheets ◽  
Absorption Characteristics

This paper presents the ways to protect workers against the electromagnetic fields in the radio frequency range up to one centimeter using a shielding method. The study focuses on the protective shields for absorbing that are produced from pure sheet metal using carbon filler between the metal sheets. There are compared their characteristics at the frequency range up to one centimeter that were obtained by calculations, modeling and experimental methods. Here are provided calculation formulas, results from computer modeling, experimental results from the metal shield itself and the shield with the carbon black filler. The results are presented in graphs. Comparison analysis of the absorption characteristics was done using a method that measured a signal that was reflected from the shield..

scholarly journals A study on an electromagnetic shield with carbon filler

2020 ◽  
Vol 329 ◽  
pp. 02040
Author(s):  
N. M. Legkiy
Keyword(s):  
Carbon Black ◽  
Experimental Methods ◽  
Multiple Comparison ◽  
Carbon Filler ◽  
Protective Properties ◽  
Metal Shield ◽  
Protective Shield ◽  
Study Results ◽  
Electromagnetic Shield ◽  
Comparison Of The Results

This article presents protective properties of an electromagnetic metal shield with the carbon black filler, as well compares its characteristics with ones that regular metal protective shield has. There are three methods to compare, namely the first is calculation, next one is simulation in CST software, and finally are experimental methods. The study results obtained with all three methods are the same. Therefore, after multiple comparison of the results obtained with two types of shields, we can say that the electromagnetic shield with the carbon filler has better shielding characteristics.

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 Bound (“Glassy”) Rubber as a Free Radical Cross-linked Rubber Layer on a Carbon Black

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1992 ◽  
Author(s):  
Alexey Kondyurin ◽  
Anastasia Eliseeva ◽  
Alexander Svistkov
Keyword(s):  
Free Radical ◽  
Carbon Black ◽  
Ion Beam ◽  
Cross Linking ◽  
Carbon Filler ◽  
Free Radical Reactions ◽  
Rubber Layer ◽  
Ion Beam Implantation ◽  
Cross Links ◽  
The Cross

A model of rubber with a cross-linked rubber layer on a carbon black filler has been proposed. The cross-links are the result of free radical reactions generated by carbon atoms with unpaired electrons at the edge of graphitic sheets in a carbon black filler. The experimental study of the cross-linking reactions in polyisoprene was done on a flat carbonized surface after ion beam implantation. The cross-linking process in the polyisoprene macromolecules between two particles was simulated. The model with a cross-linked rubber layer on a carbon filler as a “glassy layer” explains the mechanical properties of the rubber materials.

scholarly journals Fine defective structure of silicon carbide powders obtained from different starting materials

2006 ◽  
Vol 38 (2) ◽  
pp. 177-181 ◽  
Author(s):  
T.V. Tomila ◽  
M.V. Vlasova ◽  
M.G. Kakazey ◽  
K.L. Vyshnyakova ◽  
A.V. Ragulya ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbon Black ◽  
Silicic Acid ◽  
Lattice Parameter ◽  
Ir Absorption ◽  
Defective Structure ◽  
Hydrated Cellulose ◽  
Sic Particles ◽  
Acid Gel ◽  
Absorption Characteristics

The fine defective structure of silicon carbide powders obtained from silicic acid-saccharose, aerosil-saccharose, aerosil-carbon black, and hydrated cellulose-silicic acid gel systems was investigated. The relation between IR absorption characteristics and the microstructure of SiC particles obtained from different starting materials was established. The numerical relationship between the lattice parameter a and the frequency ?TO is presented.

scholarly journals Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

2011 ◽  
Vol 14 (1) ◽  
pp. 55 ◽  
Author(s):  
Anna V. Gubarevich ◽  
Kazuki Komoriya ◽  
Osamu Odawara
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Carbon Nanoparticles ◽  
Hot Press ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
X Band ◽  
Graphite Nanoparticles

In the present work, electromagnetic interference shielding properties of polymer composites with dispersed cup-stacked carbon nanotubes, graphite nanoparticles and carbon black were investigated. The polymer composites with carbon nanoparticles content from 1 to 5 w% were successfully prepared by the coagulation method, and composite sheets with thickness from 0.25 to 0.77 mm were formed by the hot press technique. The electromagnetic interference shielding efficiency measured in the frequency range of 8.2~12.4 GHz (X-band) of cup-stacked carbon nanotubes/polymer composite was considerably higher than that of carbon black and graphite nanoparticles polymer composites at the same contents of carbon nanoparticles, and contribution of absorption to the shielding efficiency was found to be higher than that of reflection.

Aspects of Searching some Possibilities to Diminish the Processing Errors at Stamping Process

2015 ◽  
Vol 809-810 ◽  
pp. 295-300
Author(s):  
Sergiu Constantin Olaru ◽  
Gheorghe Nagîţ ◽  
Marius Ionuţ Ripanu ◽  
Vasile Manole
Keyword(s):  
Sheet Metal ◽  
Quality Standards ◽  
Portable Device ◽  
Experimental Measurements ◽  
Processing Industry ◽  
Constructive Solution ◽  
Stamping Process ◽  
Metal Sheets ◽  
Processing Errors

Processing errors in the process of stamping, represent some of the most important aspect that requires attention when you want to process parts with a simple configuration. Reducing errors increase the quality of stamped parts, therefore the processing industry of blanks from metal sheets attaches great importance to them. Given the international quality standards it is required to study in detail the problem of eliminating these errors. As a result the results of researches on the establishment of a special portable device to eliminate the clearance between the sheet metal and the guidance rulers of the material in die in order to reduce the deformations of the sheet metal trough successive actions dies. Are presented the proposed constructive solution, its advantages and experimental measurements at stamping with the use of the proposed solution.

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.

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