首页|Solid solution strategy modulated defects engineering of(Cr1-xVx)2AlC MAX phase toward superior electromagnetic wave absorption

Solid solution strategy modulated defects engineering of(Cr1-xVx)2AlC MAX phase toward superior electromagnetic wave absorption

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Defects engineering is an effective strategy for manipulating electromagnetic parameters and enhancing electromagnetic wave(EMW)absorption capacity.How-ever,the relationship between them is not clear,especially in solid solution structures.In this work,a series of(Cr1-x Vx)2AlC MAX phase solid solutions with layered structure were prepared via tuning the ratio of Cr and V to explore their EMW absorption performance.The experimental results indicated that the doping of V atoms at the M-site could effectively regulate its impedance matching and EMW absorption properties by introducing appropriate numbers of defects in the crystal,such as twin boundaries,dislocations and lattice distortions.Among them,if Cr∶V=3∶1,Cr1.5V0.5AlC,as radar absorption materials,could reach a strong reflection loss of-51.8 dB at the frequency of 12.8 GHz under an ultra-thin thickness of 1.3 mm.The reflection loss value could attain-10 dB in a wide fre-quency range of 2.7-18 GHz and thickness range of 1-5 mm.In addition,after high temperature and acid-al-kali immersion treatment,this sample still had good EMW absorption capability,and the effective absorption band-width was enhanced from 2.3 to 2.6 GHz after concen-trated acid immersion or 3.1 GHz after concentrated alkali immersion.This work has great reference significance for the research and development of high-performance MAX-based EMW absorption materials in harsh environments.

MAX phasesSolid solutionDefects engineeringElectromagnetic wave absorptionHarsh environments

Ji-Lin Gou、Yu-Kai Chang、Shu Liu、Peng-Hui Li、Ping-Hao Cui、Qian-Ku Hu、Li-Bo Wang、Xin Zhang、Jun-Kai Wang、Qi-Xun Xia、Ai-Guo Zhou

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School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China

Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan University,Qinhuangdao 066004,China

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of HenanFundamental Research Funds for the Universities of Henan ProvinceHenan Postdoctoral Foundation

5227518752202364232300421135NSFRF200101202101035

2024

10.1007/s12598-024-02659-z

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(7)
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