Electromagnetic absorbing materials with light weight,high strength,wide absorption band,thin thick-ness and thermal stability are the core requirements for microwave absorption applications.In this paper,Fe3O4-MWCNTs/PLA composite wires were prepared by ball milling mixing and melt extrusion using polylactic acid(PLA)as matrix,Fe3O4 and multi-walled carbon nanotubes(MWCNTs)as fillers,and Fe3O4-MWCNTs/PLA composites were prepared by melt deposition molding(FDM).The phase structure,microstructure and electromagnetic pro-perties of the composites were characterized by XRD,SEM and vector network analyzer,respectively.The compo-site absorbing material of Fe3O4-MWCNTs/PLA has light weight,good stability,and adjustable dielectric properties,which exhibits excellent broadband absorption ability due to its good impedance matching and electromagnetic wave attenuation ability.The experimental results show that when the Fe3O4 content reaches 25wt%and the thick-ness is 1.4 mm,the reflection loss reaches-48.5 dB and the effective absorption bandwidth reaches 6.78 GHz(10.38-17.16 GHz),showing excellent microwave absorption performance.
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