▎ 摘　　要

NOVELTY - Deionized water is added to surfactant and agitated. Graphene is added to mixture and dispersed, to obtain graphene dispersion. Graphene dispersion is placed in oil bath pot of three-necked flask. Ferric chloride hexahydrate, ferrous chloride tetrahydrate and barium chloride dihydrate are dissolved in deionized water, and injected to graphene dispersion and heated. Sodium hydroxide and ammonium carbonate aqueous solution are injected to mixture, reacted, cooled and magnet adsorbed. The solid is washed and freeze-dried, to obtain graphene-barium ferromagnetic composite material. USE - Preparation of graphene-barium ferromagnetic composite material used as material as filler of electromagnetic shielding coating. ADVANTAGE - The method enables preparation of graphene-barium ferromagnetic composite material with high yield within short period of time under mild reaction condition. DETAILED DESCRIPTION - Deionized water is added to surfactant and mechanically agitated. Graphene is added to mixture and ultrasonically dispersed for 20-30 minutes, to obtain graphene dispersion. Graphene dispersion is placed in oil bath pot of three-necked flask. Condensing pipe water is condensed and inert gas is introduced. Ferric chloride hexahydrate, ferrous chloride tetrahydrate and barium chloride dihydrate are dissolved in deionized water, and injected to graphene dispersion and heated at 60-70 degrees C. Sodium hydroxide and ammonium carbonate aqueous solution are injected to mixture, reacted at 60-70 degrees C for 0.5-1 hour, cooled to room temperature and magnet adsorbed to remove supernatant. The solid is washed with deionized water and freeze-dried, to obtain graphene-barium ferromagnetic composite material.