▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene-based composite heat conducting material, comprises ultrasonically mixing silver particle dispersion liquid, copper nanowire dispersion liquid and graphene slurry uniformly to obtain mixed dispersion, taking total solid content in mixed dispersion includes 20-40 wt.% silver particles, 10-30 wt.% copper nanowires and graphene (balance amount), freeze-drying the mixed dispersion to obtain prefabricated material where freeze-drying process comprises first freeze-drying stage is uniformly raising the temperature from -15 to -10 - 0 ℃, and time is within 15 hours, second freeze-drying stage is 0 ℃ for 15-25 hours, third freeze-drying stage is uniformly raising the temperature from 0 to 30-35 ℃ and time is within 10 hours and fourth freeze-drying stage is 30-35 ℃ for 15-25 hours, hot-pressing and sintering the prefabricated material under vacuum conditions to obtain final product. USE - The three-dimensional graphene-based composite heat conducting material is useful in the technical field of electronic-heat conducting materials. ADVANTAGE - The three-dimensional graphene-based composite heat conducting material has high degree of densification, high thermal conductivity, and achieves efficient heat dissipation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for three-dimensional graphene-based composite heat conducting material obtained by above method.