▎ 摘　　要

NOVELTY - Graphene-coated aluminum/aluminum-based heat dissipation material comprises 0.1-1.5% evaporated aluminum graphene and 98.5-99.9% pure aluminum. USE - Used as graphene-coated aluminum/aluminum-based heat dissipation material. ADVANTAGE - The method: improves the wettability between graphene and aluminum metal, which is beneficial to the good interface combination, and the mechanical properties and thermal conductivity of the complex materials to meet the heat dissipation requirements. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing a heat dissipating material comprising (i) dispersing the graphene in the dispersion base liquid, where the dispersion concentration is 5-20 g/l, adopting the ultrasonic and mechanical stirring method to homogenize the treatment, the stirring rate is 1000-1500 revolutions/minute, the processing time is 30-120 minutes, using the frosted glass plate as the substrate, uniformly coating the graphene on the rotating frosted glass by a spin coating process, then using the rotary thermal evaporation method in the vacuum thermal evaporation instrument, where the micron pure aluminum powder is the evaporation source, the evaporation current range is 150-220 A, the evaporation time is 50-200 seconds, and the vacuum degree is 0.1-1x 10-3 Pa, (ii) placing 0.5-2 g aluminum-coated graphene complex powder and 200 ml ethanol in the ball mill tank, adjusting the rotation speed to 1000-1500 revolutions/minute, where the dispersion treatment is 10-30 minutes, slowly adding 500 g pure aluminum powder to the tank of the dispersion sand mill, adding the ball material, where the mass ratio of the ball material is 2-5: 1, the speed is adjusted to 1500-2500 revolutions/minute, and the dispersion is 2-3 hours, and removing the mixed powder from the tank and vacuum dry to obtain a complex powder, where the drying time is greater than 24 hours, the vacuum degree is 5-10x 10-3Pa, and the temperature is 30-40 degrees C, (iii) cold-pressing the vacuum vapor-deposited aluminum graphene/pure aluminum complex powder to make a preform with a pressure of 60-100 MPa, (iv) sintering the preform in a vacuum tube furnace with a sintering temperature of 600-650 degrees C and a holding time of 2-3 hours to obtain vacuum vapor-deposited aluminum graphene/pure aluminum complex block material, and (v) hot extruding the block material, where the extrusion ratio is 4-20: 1, the extrusion rate is 0.8-2 m/minutes, and the extrusion temperature is 420-480 degrees C, and obtaining graphene coated aluminum/aluminum-based heat dissipation material.