Study on the Microwave Absorption Properties of Feconicrmn/Pla 3d Printed Composites

Abstract

FeCoNiCrMn/PLA composites were prepared using fused deposition molding (FDM) 3D printing technology. The results show that the minimum reflection loss reaches -24.58 dB and the effective absorption bandwidth is 2.51 GHz when the FeCoNiCrMn content reaches 25 wt% and the composite thickness is 4.5 mm. FeCoNiCrMn/PLA composites contain abundant electromagnetic microwave loss mechanisms, mainly including dielectric losses such as dipole polarization, interfacial polarization, defect-induced polarization, and conductivity loss, as well as magnetic losses such as natural resonance, exchange resonance, and eddy current loss. In addition, the radar cross section (RCS) values of the composites with an FeCoNiCrMn content of 25 wt% are lower than -10 dBm² for microwave incidence angles in the range of -90° < θ < -6° and 6° < θ < 90°, indicating that the composites have a wide-angle microwave absorption capability.

Keywords: Resin-based composites, Fused Deposition Molding (FDM), Microwave absorbing properties, FeCoNiCrMn, PLA