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首页> 外文期刊>Journal of magnetism and magnetic materials >Electromagnetic, morphological and structural characterization of microwave absorbers based on POMA/magnetic filament composites
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Electromagnetic, morphological and structural characterization of microwave absorbers based on POMA/magnetic filament composites

机译:基于POMA /磁丝复合材料的微波吸收体的电磁,形态和结构表征

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摘要

HighlightsThis article focuses on recent progresses involving RAM based on hybrid composites.Magnetic and dielectric properties of materials were combined in a hybrid composite.Hybrid composites based on POMA and metallic filaments were prepared.Electromagnetic properties of RAM show the influence of the hybrid composites.Good results of microwave attenuation were determined for the studied absorbers.AbstractThis study aims to combine dielectric and magnetic properties of different materials in an unique composite. For this, poly(o-methoxyaniline), POMA, was chemically synthesizedin situon magnetic metallic filaments (MF). The obtained composite was inserted into an epoxy resin matrix in the proportions of 40, 50 and 70%, in weight (wt%). The samples were characterized by scanning electron microscopy (SEM), X ray diffraction (XRD) and electromagnetic measurements. On the last case, the measurements considered the reflectivity and the complex parameters of electrical permittivity and magnetic permeability in the frequency range of 8.2–12.4 GHz (X-band). Specimens with different thicknesses were evaluated by reflectivity. XRD results show that the filaments are based on Fe-α steel and SEM analyses show the good incorporation of POMA/MF in the epoxy resin composite. The complex parameters show that the real component of permittivity shows the largest variation with the POMA/MF concentration increasing in epoxy resin and the loss tangent indicates that the magnetic losses are preponderant on dielectric ones. The reflectivity measurements show that the 5 mm-specimen with 50 wt% of POMA/MF presents the best result of attenuation (−21.5 dB, i.e. above 99% of attenuation). Already, the sample containing 70 wt% shows the worst performance (up to −9.0 dB). The increase of POMA/MF concentration in epoxy resin confers maximum attenuation values for less thick specimens. The results show that the combination of dielectric and magnetic materials in a composite contributes for the improvement of microwave absorbing performance, and extends the possibilities of RAM processing with different characteristics.
机译: 突出显示 本文重点介绍基于混合复合材料的RAM的最新进展。 将材料的磁和介电性能混合在一起 制备了基于POMA和金属丝的混合复合材料。 RAM的电磁特性显示了影响 对于所研究的吸收剂,确定了良好的微波衰减结果。 摘要 此研究旨在将不同材料的介电和磁性能结合到一个独特的复合材料中。为此,在磁性金属丝(MF)上原位化学合成了聚(邻甲氧基苯胺)POMA。将获得的复合物以重量(wt%)的40、50和70%的比例插入环氧树脂基体中。通过扫描电子显微镜(SEM),X射线衍射(XRD)和电磁测量对样品进行表征。在最后一种情况下,测量考虑了8.2-12.4 GHz(X波段)频率范围内的反射率以及介电常数和磁导率的复杂参数。通过反射率评估具有不同厚度的样品。 XRD结果表明,长丝是基于Fe-α钢的,而SEM分析表明,POMA / MF在环氧树脂复合材料中的结合良好。复数参数表明,随着环氧树脂中POMA / MF浓度的增加,介电常数的实数部分表现出最大的变化,损耗角正切表明磁损耗在电介质中占优势。反射率测量结果表明,具有50 wt%的POMA / MF的5毫米试样呈现最佳衰减效果(-21.5 dB,即大于99%衰减)。含有70%(重量)的样品已经表现出最差的性能(高达-9.0%dB)。环氧树脂中POMA / MF浓度的增加可为厚度较小的样品提供最大衰减值。结果表明,电介质和磁性材料在复合材料中的结合有助于提高微波吸收性能,并扩展了具有不同特性的RAM处理的可能性。

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