Abstract
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.
基金项目
National Natural Science Foundation of China(52275187)
National Natural Science Foundation of China(52202364)
Natural Science Foundation of Henan(232300421135)
Fundamental Research Funds for the Universities of Henan Province(NSFRF200101)
Henan Postdoctoral Foundation(202101035)
NETL
NSTL
万方数据