The morphology of MAX phase powders significantly influences their microwave absorption properties.However,the traditional synthesis via solid-state reactions produces irregular powders,and the prepa-ration of MAX phase powders with specific morphology remains a challenge.Herein,(V0.8Ti0.1Cr0.1)2AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium,tita-nium,chromium,aluminum,and short carbon fibers as precursors.It was found that despite acting as a carbon source,carbon fibers also acted as sacrificial templates.By adjusting the molar ratio of metal powders and short carbon fibers,a series of carbon fiber@(V0.8Ti0.1Cr0.1)2AIC microrods with core-sheath structure were also obtained.Carbon fiber@(V0.8Ti0.1Cr0.1)2AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance.The reflection loss(RL)value reached up to-63.26 dB at 2.40 mm,and the effective absorption bandwidth(EAB)was about 5.28 GHz with a thickness of 2.02 mm.Based on the electromagnetic parameter analysis and theoretical simulation,the enhanced mi-crowave absorption performance was attributed to the synergistic effect of different factors like dielectric loss,magnetic loss,multiple reflection,and scattering.This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.

Wei Luo;Yi Liu;Chuangye Wang;Dan Zhao;Xiaoyan Yuan;Jianfeng Zhu;Lei Wang;Shouwu Guo

School of Material Science and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China;Department of Electronic Engineering,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong university,Shanghai 200240,China

材料科学技术（英文版）

[1]Wei Luo;Yi Liu;Chuangye Wang;Dan Zhao;Xiaoyan Yuan;Jianfeng Zhu;Lei Wang;Shouwu Guo-.Sacrificial template synthesis of(V0.8Ti0.1Cr0.1)2AlC and carbon fiber@(V0.8Ti0.1Cr0.1)2AlC microrods for efficient microwave absorption)[J].材料科学技术（英文版）,2022(16):236-244

Sacrificial,8Ti0,2AlC,2AIC

synthesis,V0,1Cr0,carbon,microrods,efficient,microwave,absorption,morphology,MAX,phase,powders,significantly,influences,their,properties,However,traditional,via,solid,state,reactions,produces,irregular,prepa,ration,specific,remains,challenge,Herein,were,fabricated,first,NaCl,KCl,molten,salts,using,vanadium,tita,nium,chromium,aluminum,short,fibers,precursors,It,was,found,that,despite,acting,source,also,acted,sacrificial,templates,By,adjusting,molar,metal,series,core,sheath,structure,obtained,Carbon,showed,optimum,performance,reflection,loss,RL,value,reached,up,dB,effective,bandwidth,EAB,about,GHz,thickness,Based,electromagnetic,parameter,analysis,theoretical,simulation,enhanced,attributed,synergistic,different,factors,like,dielectric,multiple,scattering,This,work,offers,facile,route,modulate,may,accelerate,its,application,absorbers

0.503685