▎ 摘　　要

NOVELTY - Preparation of graphene-reinforced aluminum-based composite material involves adding cetyl trimethylammonium bromide-modified positively charged aluminum powder to distilled water, stirring, obtaining aqueous suspension of aluminum powder, adding negatively charged graphene oxide to distilled water, ultrasonically dispersing, adding graphene oxide aqueous dispersion to aqueous suspension of aluminum powder, stirring, filtering, freeze-drying, adding obtained graphene oxide-aluminum composite powder to a mold made of graphite, sintering, and cooling. USE - Preparation of graphene-reinforced aluminum-based composite material (claimed). ADVANTAGE - The method enables preparation of graphene-reinforced aluminum-based composite material with excellent mechanical property and suppressed damage. The strength and hardness of the composite material is improved by 10-20% and 10-30%, respectively. DETAILED DESCRIPTION - Preparation of graphene-reinforced aluminum-based composite material involves adding 100 g cetyl trimethylammonium bromide-modified positively charged aluminum powder to 100 mL distilled water, stirring at room temperature for 30 minutes, obtaining aqueous suspension of aluminum powder, adding 0.1-0.5 g negatively charged graphene oxide to 50 mL distilled water, ultrasonically dispersing for 1 hour, obtaining graphene oxide aqueous dispersion, adding graphene oxide aqueous dispersion to aqueous suspension of aluminum powder, stirring until the mixture is colorless and transparent such that the color of negatively charged graphene oxide is adsorbed on the surface of positively charged aluminum powder, filtering, freeze-drying for 8 hours, adding obtained graphene oxide-aluminum composite powder to a mold made of graphite, sintering at 600 degrees C for 1-2 hours under pressure of 25 MPa in an argon atmosphere, and cooling to room temperature. The negatively charged graphene oxide is prepared by adding 46 mL concentrated sulfuric acid to Erlenmeyer flask under ice-cooling condition, adding 1 g graphite powder and 1 g sodium nitrate, stirring for 20 minutes under ice-cooling conditions, adding 6 g potassium permanganate under ice-cooling conditions, stirring for 40 minutes, heating obtained green and purple mixture at 30-40 degrees C for 1 hour, adding 40 mL distilled water at 30-40 degrees C, heating at 85-95 degrees C for 30 minutes, adding 100 mL distilled water and 6 mL hydrogen peroxide to resultant mixture at room temperature, adjusting pH to 6-7 using 3% hydrochloric acid solution, repeatedly washing with distilled water, filtering, and freeze-drying for 12 hours. The cetyl trimethylammonium bromide-modified positively charged aluminum powder is prepared by adding aluminum powder to 1% cetyl trimethylammonium bromide (CTAB) solution, ultrasonically dispersing for 20-60 minutes, magnetically stirring for 1-2 hours, washing with distilled water, and filtering. The content ratio of aluminum powder and 1% CTAB solution is 1 g:1-2 mL. The graphite mold surface is coated with a boron nitride barrier layer.