▎ 摘　　要

NOVELTY - Preparing alumina/graphene foam composite material involves adding oxidized graphene powder into deionized water with stirring and dispersing the particles to obtain aqueous solution of graphene oxide. The oxidized graphene aqueous solution is added in a hydrothermal reaction kettle and the hydrothermal reaction kettle is placed in a muffle furnace. The temperature of the muffle furnace is raised to 170-200 degrees C for 10-14 hours. The solution is then cooled to room temperature and the graphene hydrogel is frozen at -30 degrees C to -50 degrees C. USE - Method for preparing alumina/graphene foam composite material (claimed). ADVANTAGE - The method enables to prepare alumina/graphene foam composite material which is high-temperature resistant, antioxidant and heat-conductive. DETAILED DESCRIPTION - Preparing alumina/graphene foam composite material involves adding oxidized graphene powder into deionized water with stirring and dispersing the particles to obtain aqueous solution of graphene oxide. The oxidized graphene aqueous solution is added in a hydrothermal reaction kettle and the hydrothermal reaction kettle is placed in a muffle furnace. The temperature of the muffle furnace is raised to 170-200 degrees C for 10-14 hours. The solution is then cooled to room temperature and the graphene hydrogel is frozen at -30 degrees C to -50 degrees C and the frozen product is dried to obtain the pure graphene aerogel and anhydrous aluminum chloride powder. The pure graphene aerogel and the anhydrous aluminum chloride powder obtained by freeze-drying are added into a solvent and the solution is ultrasonically dispersed to obtain a mixed suspension containing an aluminum chloride concentration of 4-20 mg/ml and a graphene aerogel. The prepared mixed suspension is added in a hydrothermal reaction kettle and the hydrothermal reaction kettle is placed in a muffle furnace. The temperature of the muffle furnace is raised to 180-300 degrees C for 10-22 hours. The solution is then cooled to room temperature to obtain graphene/aluminum hydroxide mixed sol. The solvent in the hydrothermal reaction kettle is replaced with deionized water and the mixed sol is frozen to -30 degrees C to -50 degrees C. The frozen product is dried to obtain the graphene/aluminum hydroxide mixed gas gel which is placed in the tube furnace under the nitrogen atmosphere at 950-1300 degrees C for 10-20 hours to obtain the aluminum oxide/graphene foam composite material.