Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 920, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165960
Keywords
High entropy alloy; Core-shell structure; Nanocomposites; Microwave absorption performance
Categories
Funding
- Fundamental Research Funds for the Provincial Universities of Zhejiang [GK 209907299001-002, GK209907299001-0 03]
- Key Research and Development Plan of Zhejiang Province [2020C05014]
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This study successfully prepared FeCoNiCuTi@C nanocapsules with a core-shell structure, which exhibited excellent microwave absorption performance. The carbon shell protected the magnetic elements, improved electromagnetic parameters, and enhanced resonance frequency, resulting in good microwave absorption effects.
High entropy alloys (HEAs), a new type of functional material, are rarely applied to prepare core-shell structured nanocomposites. In this work, FeCoNiCuTi@C nanocapsules have been prepared by arc discharging HEAs ingot under the atmosphere of methane, displaying the sphere shape with the average diameter of 72.1 nm and ~ 3 nm onion-like carbon shell and the single FCC phase. The melting points, crystal structure and electronegativity play the important role on determining the element composition and atomic percentage. Carbon facilitates protecting magnetic elements, improving EM parameters and enhancing resonance frequency. Good impedance matching, strong electromagnetic loss ability and large attenuation constant ensure the microwave can enter the nanocapsules to the largest extent and could be consumed. These advantages provide the basis for the excellent microwave absorption performance ( effective bandwidth of 5.52 GHz at 1.9 mm, maximal reflection loss of -37.78 dB and absorption efficiency of 52.41 dB center dot GHz/mm at 1.8 mm) of FeCoNiCuTi@C nanocapsules. (c) 2022 Elsevier B.V. All rights reserved.
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