Heterointerface engineering of Cr2AlC@SiO2 composites for synergistically enhanced microwave absorption and high-temperature oxidation resistance

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-08-26 DOI:10.1016/j.jtice.2025.106372

Mingxuan Wang, Jingyu Gao, Yang Guo

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Abstract

Background

To meet the demand for electromagnetic stealth and reliable service in high-temperature components, developing materials integrating excellent microwave absorption performance (MAP) with high-temperature stability is crucial. Heterointerface engineering serves as a significant approach for enhancing such materials.

Methods

Herein, core-shell structured Cr₂AlC@SiO₂ composites were constructed via the Stöber process, showing enhanced high-temperature durability and electromagnetic wave attenuation capabilities. The introduced SiO₂ coating elevated the oxidation onset temperature of Cr₂AlC by 30.8 % and reduced the high-temperature oxidation activation energy (E_a) by up to 48.4 % by suppressing substrate E_a and reducing the oxygen-exposed surface area. At a thickness of 2.0 mm, the Cr₂AlC@SiO₂ composite exhibited superior MAP with a minimum reflection loss (RL_min) of -15.11 dB and an effective absorption bandwidth (EAB, RL < -10 dB) of 2.73 GHz. Compared with pristine Cr₂AlC, these values represent a 23.0 % reduction in RL_min and a 99.3 % expansion in EAB.

Significant findings

The performance improvement stems primarily from the synergistic effects of dielectric-regulated impedance matching mediated by the SiO₂ layer, coupled with the heterointerface establishing a multi-scale scattering network that collectively enhances electromagnetic energy dissipation. This research provides a novel design paradigm for developing advanced microwave absorbers integrating exceptional thermal stability and broadband absorption performance.

Abstract Image

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协同增强微波吸收和高温抗氧化Cr2AlC@SiO2复合材料的异质界面工程

为了满足高温部件电磁隐身和可靠使用的需求，开发集优异微波吸收性能（MAP）和高温稳定性于一体的材料至关重要。异质界面工程是增强这类材料性能的重要途径。方法采用Stöber工艺制备核壳结构Cr2AlC@SiO2复合材料，增强了材料的高温耐久性和电磁波衰减能力。SiO2涂层通过抑制基体Ea和减少氧暴露表面积，使Cr2AlC的起氧化温度提高了30.8%，高温氧化活化能（Ea）降低了48.4%。在2.0 mm的厚度下，Cr2AlC@SiO2复合材料表现出优异的MAP，最小反射损耗（RLmin）为-15.11 dB，有效吸收带宽（EAB, RL < -10 dB）为2.73 GHz。与原始Cr2AlC相比，这些值表明RLmin减少了23.0%，EAB增加了99.3%。性能的提高主要源于SiO2层介导的介电调节阻抗匹配的协同效应，再加上异质界面建立了多尺度散射网络，共同增强了电磁能量耗散。该研究为开发具有优异热稳定性和宽带吸收性能的先进微波吸收器提供了一种新的设计范式。

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 the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.