▎ 摘　　要

NOVELTY - Preparing composite wave absorbing material based on magnetic nanoparticles/graphene/carbon fiber comprises e.g. (1) sonicating the carbon fibers in acetone, evacuating the treated carbon fibers in flirnace cavity of the equipment of chemical vapor deposition under sealed condition and passing hydrogen gas, annealing, turning off the gas carbon source and cooling to obtain graphene/carbon fiber composite, (2) dissolving compounds of magnetic metals in deionized water to prepare solutions, stirring to mix homogeneously, enabling the deposition of oxide of the magnetic metal of this part on the graphene/carbon fiber composite by wet chemical synthesis, washing the products using deionized water to neutralize, separating and removing other products or unreacted raw materials to obtain magnetic nanoparticle/graphene/carbon fiber composite absorbents, and (3) mixing the obtained absorbent from with resin and solvent and molding to prepare absorbent material of desired shape and thickness. USE - The method is useful for preparing composite wave absorbing material based on magnetic nanoparticles/graphene/carbon fiber. ADVANTAGE - The method provides absorbing material which is multi-dimensional, cross-scale composite material constructed from zero-dimensional, one-dimensional and two-dimensional materials, can adapt to the multi-dimensional absorption characteristics of electromagnetic waves and has improved absorbing performance. DETAILED DESCRIPTION - Preparing composite wave absorbing material based on magnetic nanoparticles/graphene/carbon fiber comprises (1) (1a) sonicating the carbon fibers in acetone, washing and drying, (1b) adding the treated carbon fibers into the flirnace cavity of the equipment of chemical vapor deposition, evacuating under sealed condition and passing hydrogen gas, (1c) annealing by heating the main reaction zone of the chemical vapor deposition equipment, (1d) heating the main reaction zone of the chemical vapor deposition equipment after the annealing treatment and inlet the gaseous carbon source for the preparation of graphene on the surface of carbon fibers, during this process the radio frequency or microwave generator is in operation, causing the carbon-carbon bonds in the gaseous carbon source to be broken and deposited onto the carbon fiber surface to form graphene, and (1e) stopping the heating after the reaction in step (1d) and turning off the gas carbon source and cooling to obtain graphene/carbon fiber composite, (2) (2a) dissolving compounds of magnetic metals in deionized water to prepare solutions, (2b) taking the product graphene/carbon fiber composite from the first part into the solution prepared in step (2a) of this part and stirring to mix homogeneously, (2c) enabling the deposition of the oxide of the magnetic metal described in step (2a) of this part on the graphene/carbon fiber composite by wet chemical synthesis, (2d) washing the products using deionized water to neutralize, separating and removing other products or unreacted raw materials to obtain magnetic nanoparticle/graphene/carbon fiber composite absorbents, and (3) uniformly mixing the obtained absorbent from with resin and solvent and molding to prepare absorbent material of desired shape and thickness, where the resin used is epoxy resin, polyurethane resin, acrylate resin, polyester resin or silicone resin, the used solvent comprises cyclohexanone, xylene, acetone, propylene glycol methyl ether and/or propylene glycol methyl ether acetate, and the molding process includes spraying, scraping, molding, injection molding, and other methods.