▎ 摘　　要

NOVELTY - The preparation method of rare earth-modified graphene reinforced metal matrix composite bar involves (i) taking ethanol as a solvent, preparing rare earth solution comprising rare earth compound, ammonium chloride, urea, and sodium dimercaptopropane sulfonate, heating rare earth solution in a water bath, and adjusting the pH to 5-6 to obtain a rare earth modified solution, immersing graphene oxide in a rare earth modified solution, and ultrasonically dispersing to obtain a modified oxidized graphene dispersion, adding hydrated hydrazine solution to obtain a graphene solution. USE - Preparation of rare earth-modified graphene reinforced metal matrix composite bar (claimed). ADVANTAGE - The method enables the preparation of rare earth-modified graphene reinforced metal matrix composite bar easily by simple process at low cost with excellent dispersing ability, interfacial wetting ability, and mechanical property, and high electrical conductivity. DETAILED DESCRIPTION - The preparation method of rare earth-modified graphene reinforced metal matrix composite bar involves (i) taking ethanol as a solvent, preparing rare earth solution comprising 0.05-5.0 %mass rare earth compound, 0.1-2.0 %mass ammonium chloride, 0.01-2.0 %mass urea, and 0.15-0.3 %mass sodium dimercaptopropane sulfonate, heating rare earth solution in a water bath, and adjusting the pH of rare earth solution to 5-6 to obtain a rare earth modified solution, immersing 200-500 mg/ml graphene oxide in a rare earth modified solution at 18-22 degrees C, and ultrasonically dispersing to obtain a modified oxidized graphene dispersion, adding 80% hydrated hydrazine solution to modified oxidized graphene dispersion in a ratio of 10:7-10:10 to obtain a graphene solution, washing with absolute ethanol and deionized water at 40-60 degrees C, until rare earth ions are not detected, placing in an oven, and drying to obtain highly dispersible rare earth modified graphene powder, (ii) adding modified graphene powder and metal powder into a ball mill, vacuum milling in an argon or nitrogen protection atmosphere for 8-12 hours in a ball ratio of 2-8:1, transferring the ball-milled composite powder into package, and oscillating, (iii) vacuum heating the package at 200-300 degrees C, removing water vapor and other mixed gas from composite powder, covering and sealing the package at 0.5-2.5x 10-3 Pa, (iv) hot isostatically pressing the package to obtain a high density modified graphene metal matrix composite preform, and (v) hot-extruding the modified graphene metal matrix composite preform.