▎ 摘　　要

NOVELTY - Graphene modifying method of metal involves providing a metal powder having metal particles, graphene powder having graphene micro pieces, each formed by graphene molecules connected with each other, and a binder containing a wax material, mixing the metal powder, the graphene powder and the binder to form a powder material, generating heat by friction, heating and breaking sp3 bonds connected with each of the stearic acid functional groups after separating the stearic acid functional groups from each of the graphene molecules, connecting graphene molecules with each other through broken sp3 bond, wrapping metal particles wrapped by the graphene molecules, and sintering into a metal component to transform the graphene molecules into a three-dimensional mash embedded in the metal component. The graphene molecules have six carbon atoms connected in an annular way, and one of carbon atoms of each of graphene molecules is connected with stearic acid functional group through a sp3 bond. USE - Graphene modifying method of metal used for manufacturing heat conducting composite material such as aluminum-based or copper-based composite material used in electronic device. ADVANTAGE - The method enables to modify metal which enables graphene to be evenly dispersed in a metal, which has excellent mechanical performance, thermal performance and electric performance, and could be an ideal reinforcing member for manufacturing a heat conducting composite material. The metal powder and the grapheme can be combined in the sintering step after the ejection molding and debinding processes, thus increasing the thermal conductivity. DETAILED DESCRIPTION - Graphene modifying method of metal involves providing a metal powder having metal particles, graphene powder having graphene micro pieces, each formed by graphene molecules connected with each other, and a binder containing a wax material, mixing the metal powder, the graphene powder and the binder to form a powder material, generating heat by friction, heating and breaking sp3 bonds connected with each of the stearic acid functional groups after separating the stearic acid functional groups from each of the graphene molecules, connecting graphene molecules with each other through broken sp3 bond, wrapping metal particles wrapped by the graphene molecules, and sintering into a metal component to transform the graphene molecules into a three-dimensional mash embedded in the metal component. The graphene molecules have six carbon atoms connected in an annular way, and one of the carbon atoms of each of the graphene molecules is connected with a stearic acid functional group through a sp3 bond. The binder contains 0.5-2 wt.% coupling agent and 5-20 wt.% dispersing agent. The coupling agent is selected from titanate and chromium complex. The dispersing agent is selected from methylpentanol, polyacrylamide and fatty acid polyethylene glycol ester.