▎ 摘　　要

NOVELTY - Manufacture of graphene-coated alumina ceramic powder involves preparing amino surface-modified alumina powder, adding graphene oxide to deionized water, ultrasonically dispersing for 60-120 minutes to obtain a graphene oxide dispersion, adding aqueous ammonia solution, adjusting pH, adding prepared amino surface-modified alumina suspension such that mass ratio of aluminum oxide to graphene oxide is 10-30:1, centrifuging, drying and reducing at 300-800 degrees C in a protective atmosphere. USE - Manufacture of graphene-coated alumina ceramic powder for preparing alumina-based ceramic tool materials. ADVANTAGE - The graphene-coated alumina ceramic powder having excellent dispersibility is prepared industrially, safely and economically with high yield and without affecting the environment. DETAILED DESCRIPTION - Manufacture of graphene-coated alumina ceramic powder involves calcining alumina powder at 500-1000 degrees C for 6-12 hours, cooling to room temperature, adding hydrogen peroxide solution, oxidizing, ultrasonically processing for 35-55 minutes, washing with anhydrous ethanol, drying in vacuum, adding oxidized alumina powder to a mixed solution of anhydrous ethanol and deionized water, adding an aminosilane coupling agent and pH adjusting agent, such that mass ratio of the alumina powder to the coupling agent is 0.1-0.5 g:2-6 ml, ultrasonically processing for 10-30 minutes, stirring at 60-120 degrees C for 5-12 hours, washing with absolute ethanol, drying in vacuum to obtain an amino surface-modified alumina powder, adding deionized water, ultrasonically processing for 10-30 minutes to obtain an amino surface-modified alumina suspension, adding a dilute hydrochloric acid solution, adding graphite and sodium nitrate to concentrated sulfuric acid, stirring, slowly adding potassium permanganate, stirring for 30-60 minutes, heating to 40-60 degrees C for 8-12 hours, diluting with deionized water, heating to 98 degrees C, stirring for 30-60 minutes, cooling to 45-65 degrees C, adding hydrogen peroxide such that volume ratio of deionized water and hydrogen peroxide is 120-400:10-30, washing the resulting product with dilute hydrochloric acid and deionized water, centrifuging to obtain graphene oxide, adding graphene oxide to deionized water, ultrasonically dispersing for 60-120 minutes to obtain a graphene oxide dispersion, adding aqueous ammonia solution, adjusting pH, adding prepared amino surface-modified alumina suspension such that mass ratio of aluminum oxide to graphene oxide is 10-30:1, centrifuging, drying and reducing at 300-800 degrees C in a protective atmosphere.