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Study on Electromagnetic Properties of Graphite/Graphene/Silver-Coated Copper Powder Monolayer Coated Composites

Liu Yuanjun, Han Xiaohui, Bao Wenli, Ding Xiongwei, Zhao Xiaoming

Fibres & Textiles in Eastern Europe

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2023

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Vol. 31, no. 1

83--90

EN

With the rapid development of electronic technology and military techniques, electromagnetic protection materials are becoming more and more significant to people. Harmful electromagnetic radiation not only affects the normal operation of electronic equipments and military security, but also has a serious impact on human health. At present, using absorbing and shielding materials are effective means to reduce the harm of electromagnetic waves. In this project, graphite, graphene and silver-coated copper powder coated composites were prepared using PU-2540 polyurethane and adopting a coating process for the substrate on plain polyester/cotton fabric. The controlled variable method was used to prepare and study the electromagnetic properties of single-layer coating composites with different functional particle contents. The result showed that within the frequency range of 0.01GHz~1.0GHz, when the total mass of functional particles was 48% relative to that of the polyurethane, the value of the real part of the dielectric constant of the sample remained the largest and its polarization ability was the strongest. Within the frequency range of 0.08GHz~1.0GHz, when the content of functional particles was 24% relative to that of the polyurethane, the value of the imaginary part of the dielectric constant and the loss of the tangent value of the sample kept the maximum, and the loss and attenuation ability with respect to electromagnetic waves were both the strongest. Within the frequency range of 1.3GHz~2.0GHz, when the content of functional particles was 36% relative to that of the polyurethane, the value of the reflection loss of the sample was -26.93dB, and the minimum value of the reflection loss was obtained at a frequency of 1.6GHz, at the moment of which, the absorbing property of the sample was the best.

2

Research on the mechanical and electromagnetic properties of white Portland cement paste containing basalt fiber

Li Yue, Liu Yunze, Cheng Yaping, Jin Caiyun

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e63, 2023

EN

The search for construction materials that contribute to 5G signal transmission is important for the development of modern communication technologies. In this paper, the mechanical properties of white Portland cement (WPC) paste mixed with basalt fiber (BF) were analyzed and its electromagnetic properties were fully investigated. First, the fluidity and strength of WPC pastes with different BF contents were tested. Subsequently, the electromagnetic parameters of WPC paste samples were tested in the frequency band of 3.94 GHz-5.99 GHz, and their electromagnetic transmission properties were calculated. Finally, the mechanism of BF affecting the strength and electromagnetic transmission performance of WPC pastes was profiled using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The results show that BF can reduce the fluidity of WPC pastes. With the increase of BF doping, the strength of WPC paste rises and then decreases, and reaches the maximum strength when the volume content of BF is 0.6%. With the increase of BF content, the electromagnetic wave reflection rate of WPC paste decreases, but the absorption and transmission rate increases. The bridging effect of BF, etc. improves the strength of the paste. In WPC pastes, with the increase of BF doping, the increase of electromagnetic wave absorption rate is smaller than the decrease of reflection rate, which leads to the improvement of electromagnetic transmission performance.

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Wybrane zastosowania magnetronu cylindrycznego w produkcji części maszyn

Betiuk Marek, Łataś Zbigniew

Inżynieria Powierzchni

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2019

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nr 4

41--49

PL

W artykule przedstawiono podstawowe zagadnienia z zakresu fizyki i chemii plazmy. Omówiono wybrane obszary jej zastosowań w takich dziedzinach jak: metalurgia, inżynieria materiałowa, produkcja elementów uzbrojenia i ekologiczna technika. Omówiono nową, innowacyjną metodę nakładania powłok na wewnętrzne powierzchnie otworów i przewodów cylindrycznych, opracowaną i opatentowaną w Sieci Badawczej Łukasiewicz – Instytut Mechaniki Precyzyjnej. Artykuł w syntetycznej formie umożliwia zapoznanie się z szerokim spektrum zastosowań i potencjałem badawczym, jaki posiadają nowoczesne technologie hybrydowe.

EN

The article presents basic issues in the field of plasma physics and chemistry. Selected areas of their application in such fields as: metallurgy, engineering of materials, production of weaponry elements and ecological technology have been discussed. A new, innovative method of applying coatings to the internal surfaces of bores and cylindrical pipes, developed and patented in the Łukasiewicz Research Network – Institute of Precision Mechanics, has been discussed. The article in a synthetic form allows you to familiarize yourself with the wide spectrum of applications and research potential of modern hybrid technologies.