▎ 摘　　要

NOVELTY - Preparing graphene-aluminum matrix composite material based on in-situ reduction of aluminum powder and microwave hot pressing sintering comprises (i) adding graphite to the concentrated sulfuric acid under ultrasonic vibration, then adding hydrogen peroxide until no bubbles are generated to obtain a graphite oxide solution; (ii) pickling graphite oxide solution, washing with water to neutrality, ultrasonicating, centrifuging, drying and grinding to obtain a graphene oxide powder; (iii) ultrasonically dispersing graphene oxide powder in water to prepare a graphene oxide suspension, adding copper powder and ultrasonically stirring, adding aluminum powder, washing with water and alcohol, and drying to obtain a graphene-aluminum composite powder; (iv) adding graphene-aluminum composite powder into a mold, cold pressing the body, then placing body in a microwave hot-pressing sintering furnace, and then heating by microwave hot pressing, squeezing and naturally cooling at room temperature. USE - The method is useful for preparing graphene-aluminum matrix composite material based on in situ reduction of aluminum powder and microwave hot pressing sintering. ADVANTAGE - The composite material has high compactness, comprehensive performance, excellent thermal conductivity increased by 10.5% compared to pure aluminum and bending strength of 31%. DETAILED DESCRIPTION - Preparing graphene-aluminum matrix composite material based on in-situ reduction of aluminum powder and microwave hot pressing sintering comprises (i) adding graphite to the concentrated sulfuric acid under ultrasonic vibration at 0 degrees C, cooling at 0 degrees C, adding potassium permanganate and reacting at 0 degrees C for 36-48 hours, slowly adding dilute sulfuric acid dropwise to terminate the reaction, then adding hydrogen peroxide until no bubbles are generated to obtain a graphite oxide solution, where the solid-liquid ratio of the expanded graphite and concentrated sulfuric acid is 1g:40-70 ml and the mass ratio of the expanded graphite and potassium permanganate is 1:3-6; (ii) pickling graphite oxide solution, washing with water to neutrality, ultrasonicating, centrifuging, drying and grinding to obtain a graphene oxide powder; (iii) ultrasonically dispersing graphene oxide powder in water to prepare a graphene oxide suspension having a concentration of 0.1-1 g/ml, adjusting the pH to 3.5-4, adding copper powder and ultrasonically stirring for 60 minutes, adding aluminum powder, carrying out ultrasonic slurry for 10-60 minutes to obtain a mixed slurry, washing with water and alcohol, and drying to obtain a graphene-aluminum composite powder; (iv) adding graphene-aluminum composite powder into a mold, cold pressing the body, then placing body in a microwave hot-pressing sintering furnace, and then heating by microwave hot pressing, squeezing and naturally cooling at room temperature.