▎ 摘　　要

NOVELTY - Preparation of composite heat dissipation material involves feeding copper powder, graphene powder and carbon nanotubes into absolute ethanol solution, dispersing to obtain copper powder dispersion liquid, graphene powder dispersion liquid and carbon nanotube dispersion liquid, dispersing into electrophoresis liquid, ultrasonically processing copper or copper alloy sheet having thickness of 0.05-0.0.08 mm in absolute ethanol solution for 8 minutes, immersing in 5-8% dilute nitric acid for 1 minute, washing with deionized water, drying as cathode, using graphite sheet having thickness of 0.05-0.0.08 mm as anode, placing the cathode and anode in the electrophoresis solution to perform electrophoretic deposition, folding 350-400 layers from one end of the cathode, cooling the cathode with liquid nitrogen for 24 hours, using hydraulic machine to press the cathode during the cooling process to obtain product (A), annealing to 500-550 degrees C for 2 hours, and cooling. USE - Preparation of composite heat dissipation material used in computers, air conditioners, mobile phones, LED lighting, communication apparatus, rectifiers, medical and industrial equipment. ADVANTAGE - The method quickly reduces working ambient temperature of computers, air conditioners, mobile phones, light emitting diode lighting, communication, rectifiers, medical and industrial equipment, improves heat dissipation efficiency and extends the service life of the equipment. DETAILED DESCRIPTION - Preparation of composite heat dissipation material involves feeding copper powder, graphene powder and carbon nanotubes into absolute ethanol solution, dispersing by ultrasonically processing wave to obtain copper powder dispersion liquid, graphene powder dispersion liquid and carbon nanotube dispersion liquid, dispersing the copper powder dispersion liquid, graphene powder dispersion liquid and carbon nanotube dispersion liquid into electrophoresis liquid, ultrasonically processing copper or copper alloy sheet having thickness of 0.05-0.0.08 mm in absolute ethanol solution for 8 minutes, immersing in 5-8% dilute nitric acid for 1 minute, washing with deionized water for several times, drying as cathode, using graphite sheet having thickness of 0.05-0.0.08 mm as anode, placing the cathode and anode in the electrophoresis solution to perform electrophoretic deposition under direct current electric field, folding 350-400 layers from one end of the cathode, cooling the cathode with liquid nitrogen for 24 hours, using hydraulic machine to press the cathode during the cooling process to obtain product (A), keeping the product (A) at 450-500 degrees C for 3 hours, heating at 1100-1150 degrees C for 30 minutes under nitrogen atmosphere, annealing to 500-550 degrees C for 2 hours, and cooling. The amount of the copper powder in the electrophoresis solution is 1-3.5 mg/mL. The amount of the graphene powder in the electrophoresis solution is 0.010.05 mg/mL. The amount of the carbon nanotubes in the electrophoresis solution is 0.01-0.05 mg/mL.