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Electromagnetic wave absorbing performance of multiphase (SiC/HfC/C)/SiO2 nanocomposites with an unique microstructure

Pang, Liang ; Luo, Heng ; Fan, Xiaomeng ; Zhou, Wei ; Chen, Pengju ; Xiao, Peng ; Wen, Qingbo ; Li, Yang ; Yu, Zhaoju ; Riedel, Ralf (2021):
Electromagnetic wave absorbing performance of multiphase (SiC/HfC/C)/SiO2 nanocomposites with an unique microstructure.
In: Journal of the European Ceramic Society, 41 (4), pp. 2425-2434. Elsevier Science Ltd., ISSN 0955-2219, e-ISSN 1873-619X,
DOI: 10.1016/j.jeurceramsoc.2020.11.011,
[Article]

Abstract

Dielectric properties and electromagnetic (EM) wave absorbing performance of monolithic (SiC/HfC/C)/SiO2 nanocomposites (denoted as SHCOs) have been investigated in the X-band (8.2-12.4 GHz). The multiphase SHCOs are composed of insulating SiO2 and SiC/HfC/C nanocomposite fillers (SHC), which fillers composed of semiconducting beta-SiC, conductive HfC-Carbon core-shell nanoparticles, and interconnected carbon nanoribbons. Dielectric response indicates that the increased SHC content results in an enhanced imaginary part of the permittivity and dielectric loss, leading to an improved EM absorbing performance. The unique microstructure with an EM wave-transparent SiO2 matrix is favorable for impedance matching and effective EM wave propagation. The enhanced interface polarization and conduction loss are considered as the key mechanisms for EM wave attenuation. The minimum reflection loss of the SHCOs achieves - 60.7 dB containing 20 vol% of SHC (at 9.98 GHz) with the sample thickness of 3.33 mm, and the effective absorbing bandwidth (EAB) covers ca. 72 % of the X-band. The monolithic (SiC/HfC/C)/SiO2 nanocomposites with outstanding EM wave absorbing performance are promising candidates for EM application at high temperatures.

Item Type: Article
Erschienen: 2021
Creators: Pang, Liang ; Luo, Heng ; Fan, Xiaomeng ; Zhou, Wei ; Chen, Pengju ; Xiao, Peng ; Wen, Qingbo ; Li, Yang ; Yu, Zhaoju ; Riedel, Ralf
Title: Electromagnetic wave absorbing performance of multiphase (SiC/HfC/C)/SiO2 nanocomposites with an unique microstructure
Language: English
Abstract:

Dielectric properties and electromagnetic (EM) wave absorbing performance of monolithic (SiC/HfC/C)/SiO2 nanocomposites (denoted as SHCOs) have been investigated in the X-band (8.2-12.4 GHz). The multiphase SHCOs are composed of insulating SiO2 and SiC/HfC/C nanocomposite fillers (SHC), which fillers composed of semiconducting beta-SiC, conductive HfC-Carbon core-shell nanoparticles, and interconnected carbon nanoribbons. Dielectric response indicates that the increased SHC content results in an enhanced imaginary part of the permittivity and dielectric loss, leading to an improved EM absorbing performance. The unique microstructure with an EM wave-transparent SiO2 matrix is favorable for impedance matching and effective EM wave propagation. The enhanced interface polarization and conduction loss are considered as the key mechanisms for EM wave attenuation. The minimum reflection loss of the SHCOs achieves - 60.7 dB containing 20 vol% of SHC (at 9.98 GHz) with the sample thickness of 3.33 mm, and the effective absorbing bandwidth (EAB) covers ca. 72 % of the X-band. The monolithic (SiC/HfC/C)/SiO2 nanocomposites with outstanding EM wave absorbing performance are promising candidates for EM application at high temperatures.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 41
Number: 4
Publisher: Elsevier Science Ltd.
Uncontrolled Keywords: Dielectric properties, Impedance matching, Microstructure, X-band, Electromagnetic interference
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 12 Mar 2021 07:12
DOI: 10.1016/j.jeurceramsoc.2020.11.011
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09552...
Projects: National Natural Science Foundation of China (NSFC), Grant Number 51872246, Natural Science Foundation of Hunan Province, Grant Number 2019JJ50768, Natural Science Foundation for Young Scientists of Hunan Province, Grant Number 2019JJ50815, China Postdoctoral Science Foundation, Grant Number 2018M632987, Science and Technology Planning Project of Hunan Province, Grant Number 2015RS4016, Central South University, Grant Number 202045006, Graduate Research and Innovation Project of Central South University, Grant Number 1053320183332, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Grant Number KLSP202021, fund of the Hunan Key Laboratory of Advanced Fibers and Composites, Central South University, Grant Number XTXFKT2020-01, Technische Universität Darmstadt
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