Manufacturing method of graphene metal composite material

Abstract

A manufacturing method of a graphene metal composite material includes the steps of providing metal powder including metal particles, graphene powder including graphene pieces and binder including wax material, wherein each graphene piece includes graphene molecules connected with each other and including six carbon atoms annually connected, and one of the carbon atom of each graphene molecule is bonded with a functional group by an SP3 bond; mixing the powders and the binder into a powder material, wherein the SP3 bond is heated and broken by friction, and the graphene molecules are connected with each other via the broken SP3 bond to wrap the respective metal particles; melting and molding the powder material to form a green part; removing the binder from the green part to form a brown part; and sintering the brown part to form a metal main part embedded a three-dimensional mash formed by the graphene molecules.

What is claimed is: 
     
         1 . A manufacturing method of a graphene metal composite material, comprising the following steps:
 a) providing metal powder, graphene powder and a binder, the metal powder comprising a plurality of metal particles, the binder comprising a wax material, the graphene powder comprising a plurality of graphene pieces, each graphene piece comprising a plurality of graphene molecules connected with each other, each graphene molecule comprising six carbon atoms annually connected with each other, one of the carbon atoms of each graphene molecule is connected with a functional group by an SP3 bond;   b) mixing the metal powder, the graphene powder and the binder into a powder material, and the SP3 bond bonding each functional group being heated to broken by friction and functional groups thereby being separated from respective graphene molecules, each graphene molecule being bonded with another graphene molecule by the broken SP3 bond, and respective metal particles being thereby wrapped by the graphene molecules;   c) heating the powder material to melt into a liquid mixture material mixed of the metal powder, the binder in liquid phase and the graphene powder;   d) injection the liquid mixture material into a mold for molding and solidifying to form a green part;   e) removing the binder from the green part to transform the green part into a brown part, firstly solvent debinding the green part to remove a part of the binder and the green part being thereby transformed into the brown part with pores therein, and sequentially thermal debinding between 140□ and 170□; and   f) sintering the brown part to melt the metal particles into a metal main part and the graphene molecules being thereby formed a three-dimensional mash embedded in the metal main part.   
     
     
         2 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein the metal particles and the graphene pieces are uniformly spread in the green part in step d, and the respective graphene pieces are wrapped by the binder in solid phase and thereby adhered with the metal particles. 
     
     
         3 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein the green part is immersed into a solution to dissolve the binder when solvent debinded in step e. 
     
     
         4 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein the binder is vaporized by heating the brown part when the brown part is thermal debinded in step e. 
     
     
         5 . The manufacturing method of the graphene metal composite material according to  claim 4 , wherein the metal main part is made of aluminum or copper. 
     
     
         6 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein the functional group is an oxygen-containing functional group. 
     
     
         7 . The manufacturing method of the graphene metal composite material according to  claim 6 , wherein the functional group is seearate. 
     
     
         8 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein a coupling agent is 0.5 to 2 weight percentage of the binder, and the coupling agent is titanate or organochromium compound. 
     
     
         9 . The manufacturing method of the graphene metal composite material according to  claim 1 , wherein a dispersant is 5 to 20 weight percentage of the binder, and the dispersant is sec-hexyl alcohol, polyacrylamide or fatty acid polyethylene glycol ester.