Preparation of GR-TiN/PLA/TPU composite materials and study on their microwave absorption properties.

• 3D printed composite materials were prepared using a two-step method of ball milling co mixing and melt extrusion, as well as FDM technology. • The GR-TiN/PLA/TPU composite material was prepared through FDM technology, achieving a synergistic effect of absorption and mechanical properties. • By analyzing electromagnetic parameters and microscopic morphology, the absorption mechanism of composite materials was elaborated in detail. • The reflection loss and absorption bandwidth of the composite material are -29.08dB and 6.80GHz, respectively, with a tensile strength of 20.2MPa. In this paper, GR-TiN/PLA/TPU composite wires were prepared by melt extrusion forming process and GR-TiN/PLA/TPU composites were obtained by fused deposition moulding (FDM) technique. The effects of graphene content on the wave absorption properties and mechanical properties of the composites were investigated. With the increase of graphene content, the wave absorption performance of the composite gradually enhanced, but the mechanical properties decreased. When the GR content is 4 wt%, its maximum reflection loss is −29.08 dB at 15.60 GHz, and the effective absorption bandwidth reaches 6.80 GHz when the thickness of the absorber layer is 3.0 mm, and the tensile strength reaches 20.2 MPa.The excellent wave absorption performance can be attributed to the fact that the composite of graphene and titanium nitride not only improves the impedance matching performance of the composite but also forms abundant folds and bumps inside the composite, forms a three-dimensional micro-conducting network and enhances the interfacial polarization loss and electrical conductivity. [ABSTRACT FROM AUTHOR]