Out-of-plane Ordered Quaternary (Cr0.5V0.5)4AlC3 MAX Phase for High Temperature Stable Electromagnetic Wave Absorption Performance

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Chao Zeng, Haoliang Liu, Xianghui Feng, Yongwei Tang, Jingya Liu, Fengxiang Sui, Kai Wu, Yonghong Cheng, Bing Xiao
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Abstract

MAX phases represent a large family of nanolaminated hexagonal compounds that have gained significant attention as potential candidates for high-temperature electromagnetic wave absorbers, attributed to their remarkable oxidation resistance and electrical conductivity. However, the dielectric and absorbing performance of out-of-plane ordered 413 MAX phase remains unexplored. In this study, we have synthesized the quaternary MAX phase (Cr0.5V0.5)4AlC3 via solid-state reaction between Cr2AlC and VC, achieving a purity of up to 90.1 wt.%. The out-of-plane ordering of (Cr0.5V0.5)4AlC3 is confirmed for the first-time using STEM-EDS analysis. The oxidation behavior of (Cr0.5V0.5)4AlC3 is investigated, revealing an oxidation onset temperature of 756 °C, indicative of good oxidation stability. Additionally, the microwave absorption properties are evaluated through dielectric parameter and reflection loss measurements. (Cr0.5V0.5)4AlC3 powders exhibited exceptional electromagnetic wave absorption, with a sample of 2.6 mm thickness achieving a minimum reflection loss of -47.6 dB and an effective absorption bandwidth of 6.3 GHz, the widest among all reported pure MAX phases. Even after oxidation at 600 °C for 1 hour, the sample maintained an absorption bandwidth of 5.2 GHz. This study provides valuable insights into the preparation and application of out-of-plane ordered MAX phases for electromagnetic wave absorption at operating temperatures.

Abstract Image

面外有序四元(Cr0.5V0.5)4AlC3 MAX相高温稳定电磁波吸收性能
MAX相代表了一大家族的纳米层化六方化合物,由于其卓越的抗氧化性和导电性,作为高温电磁波吸收剂的潜在候选者受到了极大的关注。然而,面外有序413 MAX相的介电和吸收性能尚未得到充分研究。在本研究中,我们通过Cr2AlC和VC之间的固相反应合成了四元MAX相(Cr0.5V0.5)4AlC3,纯度高达90.1 wt.%。利用STEM-EDS分析首次确认了(Cr0.5V0.5)4AlC3的面外排序。研究了(Cr0.5V0.5)4AlC3的氧化行为,发现其氧化起始温度为756℃,具有良好的氧化稳定性。此外,通过测量介质参数和反射损耗来评估微波吸收性能。(Cr0.5V0.5)4AlC3粉末具有优异的电磁波吸收性能,2.6 mm厚度的样品的反射损耗最小为-47.6 dB,有效吸收带宽为6.3 GHz,是所有报道的纯MAX相中最宽的。即使在600℃氧化1小时后,样品仍保持5.2 GHz的吸收带宽。该研究为工作温度下用于电磁波吸收的面外有序MAX相的制备和应用提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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