▎ 摘　　要

NOVELTY - Preparation of graphene-reinforced brake material comprises carrying out heat-conducting modification of graphene surface by high energy ball milling silicon carbide fine powder, adding silicon carbide to ethanol solution with silane coupling agent, heating, adding silicon carbide grafted with silane coupling agent with graphene oxide, reacting, centrifuging, removing supernatant, and vacuum drying; wear-resistant modifying graphene surface by taking surface-conducting silicon carbide, soaking in sodium hydroxide aqueous solution, centrifuging, adding ethanol and deionized water, adding zirconium oxychloride suspension, adding ammonia, taking out gelatinous substance, washing with deionized water, adding hydrochloric acid to gelatinous substance to adjust pH, degumming, vacuum drying in nitrogen atmosphere, and sintering; preparing aluminum alloy with copper, nickel, manganese and magnesium; and adding surface zirconia abrasion-resistant graphene to aluminum alloy melt and smelting. USE - Method for preparing graphene-reinforced brake material. ADVANTAGE - The method increases wear resistance and thermal conductivity of material, and improves running stability and wear resistance of graphene in aluminum-based brake disk by sequentially coating surface of graphene with thermally conductive silicon carbide layer and wear-resistant zirconia layer. The material has good hardness, wear resistance and thermal conductivity. DETAILED DESCRIPTION - Preparation of graphene-reinforced brake material comprises carrying out heat-conducting modification of graphene surface by high energy ball milling silicon carbide fine powder to average particle diameter of 20-50 nm, adding 10-15 pts. wt. silicon carbide to 100-140 pts. wt. ethanol solution with 2-5 wt.% silane coupling agent, heating under reflux for 2-4 hours, adding silicon carbide grafted with silane coupling agent with 20-30 pts. wt. graphene oxide, reacting, centrifuging, removing supernatant, and vacuum drying; wear-resistant modifying graphene surface by taking 5-8 pts. wt. surface-conducting silicon carbide which is thermally conductive, soaking in sodium hydroxide aqueous solution for 1-3 hours to increase number of hydroxyl groups on surface, centrifuging, adding ethanol and deionized water, adding zirconium oxychloride suspension, adding 30-35 wt.% aqueous ammonia dropwise to pH of 10-11, taking out gelatinous substance, washing with deionized water, adding 3-5 wt.% hydrochloric acid to gelatinous substance to adjust pH to 1-2, degumming, vacuum drying in nitrogen atmosphere, and sintering; preparing aluminum alloy with 0.2-0.4 wt.% copper, 0.1-0.3 wt.% nickel, 0.05-0.1 wt.% manganese and 5-10 wt.% magnesium; and adding 4-7 pts. wt. surface zirconia abrasion-resistant graphene to 100 pts. wt. aluminum alloy melt and smelting.