Microwave absorption characterization of hollow and porous rGO-FeCoNiCrMn/EC/EP composite microsphere materials

IF 6.5 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Enyi He , Ke Zhao , Yu Cheng , Qi Gao , Xicong Ye , Yongsheng Ye , Haihua Wu
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引用次数: 0

Abstract

Multi-material composite can effectively realize the lightweight, broadband and strong absorption requirements of microwave-absorbing materials. In this paper, hollow porous rGO-FeCoNiCrMn/EC/EP composite microwave-absorbing microspheres were prepared by the microemulsion method. EC and EP refer to ethyl cellulose and epoxy resin, respectively, which are mainly used as wall skeleton and core material in the formation of composite microspheres.The rGO-FeCoNiCrMn/EC/EP composite microspheres have abundant hollow porous structures, which provide good impedance-matching properties for the microwave-absorbing materials, and are favorable for enhancing the multiple reflection and scattering of microwaves. The multi-material composite constructs abundant dielectric/magnetic heterogeneous interfaces, which is conducive to increasing the microwave-absorbing properties of the materials. The excellent microwave-absorbing properties of composites stem from the fact that the materials possess a wealth of EM loss mechanisms, such as dipole polarization, interfacial polarization, conductive loss, natural resonance, exchange resonance, and eddy current loss. The effective absorption bandwidth of the composite microspheres reached 5.2 GHz (10.4∼15.6 GHz) at 2.5 mm thickness when the rGO content was 2.8 wt%. The composite microspheres with rGO content of 5.4 wt% and thickness of 2.5 mm achieve a minimum reflection loss of -50.46 dB at 10.08 GHz, and an effective absorption bandwidth of 3.6 GHz (11.2∼14.8 GHz) at a thickness of 1.5 mm. Variations in material thickness in the range of 1∼5 mm allow effective absorption of electromagnetic(EM) microwaves in the 4∼18 GHz band, i.e. almost the entire C, X and Ku bands. Finally, the rGO-FeCoNiCrMn/EC/EP composite microspheres were tested by RCS simulation. The simulation results show that the rGO-FeCoNiCrMn/EC/EP composite microspheres have the wide-angle absorption characteristics of EM microwave. The composites with rGO content of 5.4 wt% can realize the RCS below -10 dBm2 over the whole range when the incidence angle of EM microwaves varies in the range of -90° < θ < 90°, and the composites with rGO content of 6.7 wt% and 7.9 wt% can realize the RCS below -10 dBm2 in the range of 95.5% of the incidence angle. In this paper, the preparation and microwave-absorbing mechanism of rGO-FeCoNiCrMn/EC/EP composites is investigated, which provides a new solution for the preparation of highly efficient broadband EM microwave-absorbing materials with a wide range of application prospects.
空心和多孔 rGO-FeCoNiCrMn/EC/EP 复合微球材料的微波吸收表征
多材料复合能有效实现微波吸收材料轻质、宽带、强吸收的要求。本文采用微乳液法制备了中空多孔 rGO-FeCoNiCrMn/EC/EP 复合微波吸收微球。rGO-FeCoNiCrMn/EC/EP复合微球具有丰富的中空多孔结构,为微波吸收材料提供了良好的阻抗匹配性能,有利于增强微波的多次反射和散射。多材料复合体构建了丰富的介电/磁异质界面,有利于提高材料的微波吸收性能。复合材料优异的微波吸收特性源于材料具有丰富的电磁损耗机制,如偶极子极化、界面极化、传导损耗、自然共振、交换共振和涡流损耗等。当 rGO 含量为 2.8 wt% 时,厚度为 2.5 mm 的复合微球的有效吸收带宽达到 5.2 GHz(10.4∼15.6 GHz)。rGO 含量为 5.4 wt%、厚度为 2.5 mm 的复合微球在 10.08 GHz 时的最小反射损耗为 -50.46 dB,厚度为 1.5 mm 时的有效吸收带宽为 3.6 GHz (11.2∼14.8 GHz)。材料厚度在 1 至 5 毫米范围内的变化可有效吸收 4 至 18 千兆赫频段的电磁微波,即几乎整个 C、X 和 Ku 波段。最后,对 rGO-FeCoNiCrMn/EC/EP 复合微球进行了 RCS 模拟测试。模拟结果表明,rGO-FeCoNiCrMn/EC/EP 复合微球具有电磁微波广角吸收特性。当电磁微波的入射角在-90° < θ < 90°范围内变化时,rGO含量为5.4 wt%的复合微球可以在整个范围内实现低于-10 dBm2的RCS,而rGO含量为6.7 wt%和7.9 wt%的复合微球可以在95.5%的入射角范围内实现低于-10 dBm2的RCS。本文研究了 rGO-FeCoNiCrMn/EC/EP 复合材料的制备及微波吸收机理,为制备高效宽带电磁微波吸收材料提供了新的解决方案,具有广泛的应用前景。
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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