Radar-Absorbent Polymer Composites Filled with Magnetic Iron Powder and Carbon Nanotubes

Kraev, I.D.; Сорокин, А. Е.; Пыхтин, А. А.; Filonova, E. V.

doi:10.1134/s207511332201021x

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…These fillers are introduced as a mixture into the volume of matrices. Both mixtures of magnetic powders and non-magnetic particles in combination with magnetic inclusions can be used as such fillers [ 55 , 56 , 57 ].…”

Section: Radio-absorbing Materials and Technologies For Their Productionmentioning

confidence: 99%

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

et al. 2022

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Recently, designers of electronic equipment have paid special attention to the issue of electromagnetic compatibility (EMC) of devices with their own components and assemblies. This is due to the high sensitivity of semiconductor microcircuits to electromagnetic interference. This interference can be caused either by natural phenomena, such as lightning strikes, or by technical processes, such as transients in circuits during fast periodic or random switching. Either way, interference implies a sudden change in voltage or current in a circuit, which is undesirable, whether it propagates along a cable or is transmitted as an electromagnetic wave. The purpose of this article is to review the works devoted to the development, creation, and investigation of modern polymeric nanocomposite materials used for shielding electromagnetic radiation and their effective application for solving problems of electromagnetic compatibility. Additionally, the approach to design EMI shielding complex media with predetermined parameters based on investigation of various properties of possible components is shown. In the review, all polymer composites are classified according to the type of filler. The issues of the interaction of a polymer with conductive fillers, the influence of the concentration of fillers and their location inside the matrix, and the structure of the nanocomposite on the mechanisms of electromagnetic interaction are considered. Particular attention is paid to a new generation of nanocomposite materials with widely adjustable electrical and magnetic properties. A wide class of modern filled polymeric materials with dielectric and magneto-dielectric losses is considered. These materials make it possible to create effective absorbers of electromagnetic waves that provide a low level of reflection coefficient in the microwave range. The model mechanisms for shielding electromagnetic radiation are considered in the paper. A detailed review of the electro-physical properties of polymer nanocomposites is provided. Multilayer electrodynamic media containing combinations of layers of filled polymer composite materials with nanoparticles of different compositions and manufactured using a single technology will make it possible to create electrodynamic media and coatings with the required electro-physical characteristics of absorption, transmission, and reflection. Within the framework of the two-layer coating model, the difference in the effects of the interaction of electromagnetic radiation with conductive layers located on a dielectric and metal substrate is demonstrated. It is shown that in order to achieve optimal (maximum) values of reflection and absorption of electromagnetic radiation in the appropriate frequency range, it is necessary to fit the appropriate layer thicknesses, specific conductivity, and permittivity. Such approach allows designers to create new shielding materials that can effectively vary the shielding, absorbing, and matching characteristics of coatings over a wide frequency band. In general, it can be said that the development of innovative polymer composite materials for shielding electronic devices from electromagnetic interference and excessive electromagnetic background is still an important task. Its solution will ensure the safe and uninterrupted operation of modern digital electronics and can be used for other applications.

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Section: Radio-absorbing Materials and Technologies For Their Productionmentioning

confidence: 99%

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

et al. 2022

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“…The use of filler mixtures containing magnetic materials and carbon at certain ratios in a single polymer phase, 26,37 the design of multilayered structures, 38,39 and the synthesis and use of multilayered hybrid fillers [40][41][42] are some widely used techniques to reduce weight while having higher absorption performance. Most of these approaches aim to provide a broader absorption bandwidth compared to carbon-filled composites and lower weight compared to magnetic filler-based composites.…”

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confidence: 99%

Nickel‐coated carbon fillers for polyurethane foam with improved microwave absorption performance: A comparative analysis

Kurt,

Korkmaz,

Kasgoz

2023

Polymer Engineering & Sci

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In this study, polyurethane foam (PUF) composites were prepared by incorporating different functional fillers, and morphological, rheological, dielectric, and microwave absorption properties of these composite samples were investigated. Graphite (G), nickel (Ni), nickel‐coated hybrid carbon (NiC), and iron II‐III oxide (Fe3O4) powders were used as functional fillers, while rigid polyurethane foam (PUF) with a 40 kg/m3 density and a closed‐cell structure was used as the carrier foam phase. Morphological analyses that were carried out by scanning electron microscopy showed that all fillers were dispersed between the cell walls. In dielectric characterization, the highest electrical permittivity values were obtained by incorporation of G, while the highest magnetic permeability values were obtained by incorporation of Fe3O4 at the same filler concentration. Furthermore, the PUF composites could be prepared using NiC at a higher filler concentration than the others due to the lower viscosity increasing effect of NiC. The highest microwave absorption performance was obtained in the NiC‐filled PUF composite at a filler concentration of 120 phr. The minimum reflection loss (RL) value of −45.2 dB at 10.62 GHz and an RL value lower than −10 dB in the entire X‐band region were obtained in the NiC‐filled PUF composite.Highlights Nickel‐coated carbon (NiC) filled polyurethane foam (PUF) was prepared. The absorption performance of NiC was compared to conventional filler. PUF composites containing NiC showed lower viscosity and processability. The highest absorption could be obtained by NiC compared to conventional fillers.

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Radar-Absorbent Polymer Composites Filled with Magnetic Iron Powder and Carbon Nanotubes

Cited by 2 publications

References 16 publications

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

Nickel‐coated carbon fillers for polyurethane foam with improved microwave absorption performance: A comparative analysis

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