▎ 摘　　要

NOVELTY - Preparation of aluminum alloy composite heat dissipation material containing carbide/graphene sandwich structure involves adding 0.51-5wt.% nickel nitrate nonahydrate to ethanol, dissolving, adding prepared nitrate ethanol solution to 85.0-94.9wt.% resin, stirring and mixing for 4-25 minutes, pouring 5.1-10.0 wt.% expanded graphite, stirring for 10-30 minutes to obtain mixture A, peeling off mixture A by three-roll mill, obtaining nano -graphene sheet/resin mixture B after cyclic peeling for 12-20 times, adding elemental nanopowder to nano-graphene sheet/resin mixture B at mass ratio of 0.85-1.5:1, mechanically stirring for 20-40 minutes to obtain mixture C, and placing mixture C in tube furnace in air atmosphere for heat treatment. USE - The method is used for preparing aluminum alloy composite heat dissipation material containing carbide/graphene sandwich structure for LED lamp (claimed). ADVANTAGE - The composite radiating material has compact structure, clean surface, high heat conducting and radiating efficiency, and prolongs the service life of the LED lamp. DETAILED DESCRIPTION - Preparation of aluminum alloy composite heat dissipation material containing carbide/graphene sandwich structure comprises adding 0.51-5wt.% nickel nitrate nonahydrate to ethanol, dissolving, adding prepared nitrate ethanol solution to 85.0-94.9wt.% resin, stirring and mixing for 4-25 minutes, pouring 5.1-10.0 wt.% expanded graphite, stirring for 10-30 minutes to obtain mixture A, peeling off mixture A by three-roll mill, obtaining nano-graphene sheet/resin mixture B after cyclic peeling for 12-20 times, adding elemental nanopowder to nano-graphene sheet/resin mixture B at mass ratio of 0.85-1.5:1, mechanically stirring for 20-40 minutes to obtain mixture C, where elemental nanopowder is silicon powder, boron powder, titanium powder, tungsten powder, and/or zirconium powder, content of elemental nano-powder is greater than or equal to 99.5%, and particle size is less than or equal to 100 nm, placing mixture C in tube furnace in air atmosphere for heat treatment, heating to 100degreesC with heating rate of 2-3degreesC/minute for 0.5-1 hour, heating at 200degrees Celsius for 2-4 hours, passing argon gas, heating at 1000degreesC with heating rate of 4-8degreesC/minute for 1-3 hours, heating at 1300-1450degreesC with heating rate of 3-5degreesC/minute for 0.5-6 hours, naturally cooling to room temperature to obtain reaction mixture D, smelting aluminum alloy at 660-700degreesC for 3-6 hours, crushing reaction mixture D, adding it to aluminum alloy melt, adding slag remover, entering liquid surface, repeatedly move back and forth up and down, degassing, scraping slag, fully stirring to obtain mixed melt E, pouring mixed melt E into mold, and molding.