材料科学
反射损耗
多孔性
电介质
阻抗匹配
介电损耗
复合材料
电阻抗
光电子学
复合数
电气工程
工程类
作者
Di Lan,Zijie Zhao,Zhenguo Gao,Kaichang Kou,Guanglei Wu,Hongjing Wu
标识
DOI:10.1016/j.jmmm.2020.167065
摘要
Spherical high-entropy alloys (HEAs) were prepared as a template by the traditional ball milling method, and the pure porous HEAs electromagnetic (EM) wave absorbing material was successfully obtained by etching the template with nitric acid/copper nitrate solution. The crystal structure, chemical composition and distribution, EM parameters and EM wave absorbing performance were characterized in detail. The results showed that the excellent impedance matching, magnetic loss performance and good dielectric loss of porous HEAs were the key factors leading to the excellent EM wave absorbing performance. The effective absorption bandwidth of the porous HEAs samples can reach to 4.48 GHz at the thickness of 1.7 mm, and the minimum reflection loss can reach to −40.2 dB at the same time. The feature of strong absorption at the thin thickness make HEAs a possible new generation of efficient EM wave absorber. The preparation idea and method of the samples also have important reference value.
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