▎ 摘　　要

NOVELTY - Three-dimensional (3D) printing preparation of a titania-Ti3C2Tx/rGO electromagnetic shielding composite material with gradient structure, comprises (1) using 12M hydrochloric acid and lithium fluoride to selectively etch metal aluminum layer in titanium aluminum carbide, ultrasonicating and freeze drying to form Ti3C2Tx, (2) using the improved Hummer method to exfoliate the graphite into few-layer graphene oxide, and forming graphene oxide nanosheets, (3) dispersing freeze-dried Ti3C2Tx and graphene oxide nanosheets into water to form a dispersion and ultrasonically treating for 15 minutes, transferring into an agate mortar and grinding into printing ink, (4) extruding printing ink directly extruded and printing by a 3D printer to obtain a Ti3C2Tx/GO electromagnetic shielding composite material with a three-dimensional gradient structure, and(5) controlling the oxidation of the above three-dimensional framework under nitrogen atmosphere to obtain final product. USE - The method for three-dimensional printing preparation of a titania-Ti3C2Tx/rGO electromagnetic shielding composite material with gradient structure and used in radar system, aerospace, fifth generation (5G) network and computer. ADVANTAGE - The three-dimensional conductive structure with gradient hole not only enhances the conductivity loss, but also can increase the multiple reflection of electromagnetic wave between the pores. The successful design of the gradient aperture structure, improves the impedance matching of the material, which is an effective way for improving electromagnetic shielding performance from the existing material to the ideal component, the breakthrough successfully overcomes the inherent defect of the traditional processing technology cannot be customized.