▎ 摘　　要

Devices with complex structures are usually fabricated by fused deposition modeling (FDM) 3D printing technology. In this work, graphene (GR)/FeSiAl/polylactic acid (PLA) composites with various contents of graphene were successfully prepared by FDM 3D printing technology. The mechanical properties of the composites deteriorated, and the absorption properties gradually increased with increasing graphene content. The GR/FeSiAl/PLA composites containing 30 wt% FeSiAl and 4 wt% graphene exhibit a maximum reflection loss (RL) value of - 46.63 dB, and the effective absorption bandwidth (EAB, RL & LE; - 10 dB) is 4.80 GHz (13.2-18 GHz) with a sample thickness of 2.2 mm. Meanwhile, the maximum RL value is - 31.53 dB and the EAB is 6.40 GHz (11.6-18 GHz) of GR/FeSiAl/PLA composites with graphene content of 5 wt% and FeSiAl content of 30 wt% with the same thickness. The excellent absorption properties of these composites are attributed to good impedance matching, and the synergistic effect of dielectric loss and magnetic loss.