▎ 摘　　要

NOVELTY - 5G-based high-performance electromagnetic shielding material comprises three-dimensional reinforced carbon foam, silicon carbide nano-wire, graphene, and resin composition. The material is obtained by in-situ growth of silicon carbide nano-wire inside foamed carbon, then dispersing graphene uniformly in resin, and filling the graphene-containing resin inside the foamed carbon reinforced with silicon carbide nano-wire; and material having bulk density of less than or equal to 2.5 g/cm3. USE - Used as 5G-based high-performance electromagnetic shielding material. ADVANTAGE - The material: has excellent shielding effect on high-frequency electromagnetic waves, wide shielding frequency and excellent heat dissipation; and ensures integration of structure and function. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing 5G-based high-performance electromagnetic shielding materials, comprising (i) pyrolyzing organic foam at high temperature to prepare foamed carbon, where the pyrolysis temperature is not greater than 1100 degrees C, heating rate is not greater than 2 degrees C/minute, and maintaining time is not greater than 1 hour, (ii) growing silicon carbide nano-wire in-situ on the step (i) foamed carbon by using chemical vapor infiltration (CVI) under nickel catalysis to obtain silicon carbide nano-wire reinforced foam carbon matrix having metal ball at the tip, where the concentration is not greater than 0.01 g/mol, (iii) dispersing graphene in resin by using mechanical mixing combined with ultrasonic dispersion technology thus graphene is uniformly dispersed without agglomeration, and mixing for 30-40 minutes, and (iv) mixing the step (iii)material into the step (ii) material by vacuum pressure impregnation, then curing at 150-180 degrees C.and for 30-50 minutes to obtain graphene modified resin composite silicon carbide nano-wire reinforced foam carbon material.