Tunable electromagnetic and broadband microwave absorption of SiO2-coated FeSiAl absorbents

JOURNAL OF ALLOYS AND COMPOUNDS

卷:861

Article

Zhou, Liang^1,3  Xu, Huan¹  Su, Gexin¹  Zhao, Libin²  Wang, Hongbo^1,3  Wang, Zhenjun^1,3  Li, Zhuo^1,3 

[1] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Peoples R China

[2] Shanxi Yinguang Huasheng Magnesium Co Ltd, Wenxi 043800, Peoples R China

[3] Changan Univ, Engn Res Ctr Transportat Mat, Minist Educ, Xian 710061, Peoples R China

关键词: FeSiAl;    Permittivity;    Permeability;    Microwave absorption;   

DOI  :  10.1016/j.jallcom.2020.157966

来源: Elsevier

【 摘 要 】

SiO2-coated FeSiAl absorbents were prepared by StOber method. The microstructure, complex permittivity and complex permeability of the samples synthetized with different tetraethyl orthosilicate (TEOS) content were systematically explored. The results show that the microwave absorption properties of the SiO2-coated FeSiAl absorbents were enhanced significantly by controlling the TEOS content. The sample synthetized with 10 ml TEOS exhibits the minimum reflection loss of -21.4 dB at 11.1 GHz and the effective absorption bandwidth of 3.8 GHz in 8.6-12.4 GHz. The superior microwave absorption performance was attributed to the multi-effects of the effective transmission channel, dielectric loss, and magnetic loss. Therefore, the introduction of insulating layer in ferromagnetic absorbents can be qualified as favorable absorbents for broadband and efficient microwave absorption. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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