Selective Laser Sintering of NFG/Fe ₃ O ₄ and NFG/SiCnw Composites for Efficient Electromagnetic Microwave Absorption

This study details the creation of NFG/Fe ₃ O ₄ and NFG/SiCnw composites utilizing selective laser sintering (SLS) technology, along with a range of postprocessing methods for structural‐functional integration in electromagnetic microwave absorption, based on the preparation of hybrid powders. The NFG/Fe ₃ O ₄ composite, after vacuum impregnation with epoxy resin solution, reaches a flexural strength of 7.12 MPa. At a thickness of 2 mm, the composite exhibits a minimum reflection loss (RL) of −41.81 dB and an effective absorption bandwidth (EAB) of 6.56 GHz. The green bodies produced by SLS feature rich microporous structures, which provide an optimal environment for the in situ generation of SiCnw during high‐temperature sintering. The efficient microwave absorption properties of the NFG/SiCnw composite stem from the synergy between conductivity loss and polarization loss, as well as multiple reflection and scattering loss mechanisms. When the thickness is 1.5 mm, the porous NFG/SiCnw composite demonstrates remarkable electromagnetic microwave absorption capabilities, with an RL _min of −51.10 dB and an EAB of 5.04 GHz. The NFG/Fe ₃ O ₄ and NFG/SiCnw composites, fabricated using SLS technology and enhanced through various postprocessing techniques, successfully combine radar wave absorption and structural support, offering immense potential for industrial applications in electromagnetic wave absorption.