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Research Article | Open Access

Boosting electromagnetic wave absorption of Ti3AlC2 by improving effective electrical conductivity

Kai-Yu Guo, Lin Chen, Guan-Jun Yang( )
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Graphical Abstract

Abstract

Electromagnetic wave-absorbing (EMA) materials at high temperatures are limited by poor conduction loss (Lc). However, adding conductors simultaneously increases the conduction loss and interfacial polarization loss, leading to a conflict between impedance matching (Zin/Z0) and electromagnetic wave loss. This will prevent electromagnetic waves from entering the EMA materials, finally reducing overall absorbing performance. Here, the effective electrical conductivity (σ) is enhanced by synchronizing particle size and grain number of Ti3AlC2 to increase the conduction loss and avoid the conflict between the impedance matching and the electromagnetic wave loss. As a result, the best-absorbing performance with an effective absorption bandwidth (EAB) of 4.8 GHz (10.6–15.4 GHz) at a thickness of only 1.5 mm is realized, which is the best combination of wide absorption bandwidth and small thickness, and the minimum reflection loss (RLmin) reaches −45.6 dB at 4.1 GHz. In short, this work explores the regulating mechanism of the EMA materials of effective electrical conductivity by simulated calculations using the Vienna ab-initio Simulation Package (VASP) and COMSOL as well as a series of experiments, which provide new insight into a rational design of materials with anisotropic electrical conductivity.

Keywords

anisotropic electrical conductivityconduction loss (Lc)interfacial polarization loss (LIP)effective electrical conductivityco-optimize impedance matching (Zin/Z0)electromagnetic wave loss

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Journal of Advanced Ceramics
Volume 12 Issue 8,
August 2023
Pages 1533-1546
DOI: 10.26599/JAC.2023.9220770
Cite this article:
Guo K-Y, Chen L, Yang G-J. Boosting electromagnetic wave absorption of Ti3AlC2 by improving effective electrical conductivity. Journal of Advanced Ceramics, 2023, 12(8): 1533-1546. https://doi.org/10.26599/JAC.2023.9220770

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Received: 14 March 2023
Revised: 26 April 2023
Accepted: 21 May 2023
Published: 19 July 2023
© The Author(s) 2023.

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