Electromagnetic Properties of Composite Materials Based on Nd-Compound Modified Fe-Si-Al Alloy

Goryachko, А. I.; Ivanin, S. N.; Buz’ko, V. Yu.

doi:10.1088/1757-899x/969/1/012019

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…The obtained values of dielectric constant and dielectric loss tangent for the composites derived from biogenic silica sample with the ratio m(NH 4 NO 3 )/m(RH)=2.5 allow it to be used as an environmentally friendly low-cost microwave absorbing reinforcing filler for lightweight concrete compositions to absorb electromagnetic radiation with frequencies above 2 GHz, agreeing well with data [16]. As a microwave absorbing filler, produced by carbon-containing amorphous silica from rice hulls, it is inferior to previously studied domestic magnetic radio-absorbing materials such as magnetic microspheres [17], Fe-Si-Al alloy powder [18] or ferrites of spinel series [19,20], however, it is an easily produced low cost ecological microwave dielectric absorbing material. It is important to note that the microwave-absorbing nanostructured amorphous biosilica samples obtained by us was prepared by a simple low-tech method from cheap biorenewable natural raw materials, such as rice husk.…”

Section: Discussionsupporting

confidence: 66%

Electromagnetic characteristics of biosilica from rice husk

et al. 2021

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Rice husk, being a widely available natural plant renewable agricultural resource, can be transformed into effective reinforcing fillers of special concrete and gypsum building materials. The samples of silica from rice husks were synthesized by thermal oxidative pyrolysis and their electromagnetic and microstructural characteristics were investigated. It was found that the rice husk itself is practically EM-wave transparent material in the frequency range of 0.1-7 GHz, while the products of its thermal oxidative pyrolysis have different microwave absorbing properties, depending on the amount of oxidizing agent used. The X-ray powder diffraction data showed the predominant presence of amorphous silica in the samples of rice husk ash with a small amount of α-quartz, α-cristobalite and α-tridymite. At a pyrolysis reaction temperature of rice husk of about 560 ± 20°C, the resulting product, in addition to amorphous silica and crystalline phases of silicon dioxide, contains traces of graphite particles, which leads to a sharp increase in dielectric characteristics and effective microwave absorption. When the temperature of the pyrolysis reaction of rice husk rises above 700°C the EM-wave absorption of such materials decreases. Thus, on the basis of the experiments carried out, the optimal ratios of rice husk and the used oxidizer of ammonium nitrate were revealed to obtain environmentally friendly ecological low-cost powder nanostructured biosilica additives for concrete and gypsum building compositions with increased effective radio absorption in the frequency range of the electromagnetic field above 1 GHz.

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Section: Discussionsupporting

confidence: 66%

Electromagnetic characteristics of biosilica from rice husk

et al. 2021

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“…This compounding scheme improves the modulus of modified asphalt and maintains the toughness of the mixture. The feasibility of compound modified asphalt technology can be found based on the existing research [ 24 , 25 , 26 ]. However, the practical application of modifiers such as epoxy resin and nano-graphene oxide will be limited by their high prices [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Properties of Bone Glue/Polyurethane Composite Modified Asphalt and Its Mixture

Yan

Xie

et al. 2021

Materials

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Composite modification technology is widely used in the materials field. To enhance the property of polyurethane modified asphalt and realize its application in road engineering, the bone glue/polyurethane composite modified asphalt (CMA) was prepared using bone glue, polyurethane, and neat asphalt in this research. The bone glue content ranges 5–10%, that of the polyurethane is 1–5%. The relationship between the modifier’s content and the conventional properties and rheological properties of CMA was revealed by response surface methodology (RSM). The CMA performance was further verified under the optimal content of the bone glue and polyurethane. The differences of properties of styrene–butadienestyrene (SBS) modified asphalt mixture, neat asphalt mixture, and bone glue/polyurethane CMA mixture were compared and analyzed by using the pavement performance test. The results showed that the CMA’s conventional properties and rheological properties are improved. The optimal bone glue content and polyurethane content determined by RSM are 6.848% and 2.759%, respectively. The low-temperature crack resistance and water stability of the CMA mixture are enhanced, better than neat asphalt mixture and SBS modified asphalt mixture. The CMA mixture’s dynamic stability is 85% of SBS modified asphalt mixture, but it is 2.4 times of neat asphalt mixture. The result indicated that the bone glue/polyurethane CMA mixture still has certain advantages of high-temperature stability. In this research, the composite modification of bone glue and polyurethane can significantly enhance the characteristic of asphalt and asphalt mixture and provide a new method for applying and promoting polyurethane modified asphalt in road engineering.

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Magnesium Spinel Ferrites Development for FDM 3D-Printing Material for Microwave Absorption

et al. 2022

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The magnesium nanosized ferrite powder with formula MgFe2O4 was synthesized via a pyrochemical sol–gel glycine–nitrate method and annealed consistently at temperatures of up to 1300 °C. The MgFe2O4 ferrite samples’ microstructure was studied by SEM and XRD methods. According to the results of the studies, the increase in MgFe2O4 nanoparticles size from about 15 nm to micron-sized particles was observed when increasing annealing temperatures. The DC electrical conductivity of MgFe2O4 also clearly shows the change in conduction behavior of samples with increased calcination temperatures. The electromagnetic microwave properties of micron-sized particles of MgFe2O4 ferrite powder for a 1200 °C annealing temperature were studied for composites in paraffin matrix with produced magnetic filler mass concentration at 40% and 50%. The filament composites of polymer polylactic acid with MgFe2O4 ferrite powder samples were prepared by the FDM 3D-printing process and their microwave-absorbing properties were investigated. The application of developed PLA–MgFe2O4 ferrite filament for fabricating magnetic microwave-absorbing components also was demonstrated.

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Electromagnetic Properties of Composite Materials Based on Nd-Compound Modified Fe-Si-Al Alloy

Cited by 3 publications

References 20 publications

Electromagnetic characteristics of biosilica from rice husk

Electromagnetic characteristics of biosilica from rice husk

Study on Properties of Bone Glue/Polyurethane Composite Modified Asphalt and Its Mixture

Magnesium Spinel Ferrites Development for FDM 3D-Printing Material for Microwave Absorption

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