Preparation method of graphene coating metal base composite powder through vapour deposition

Abstract

The invention discloses a preparation method of graphene coating metal base composite powder through vapour deposition, which is easy to operate and low in cost. Through the adoption of the method, many limits in conventional methods for preparing graphene reinforcing metal base composite powder can be effectively avoided, and the produced graphene reinforcing metal base composite powder can be adapted to conventional powder metallurgy and the manufacturing process of a plurality of additional materials. According to the method disclosed by the invention, a single layer or a few layers of graphene can be uniformly coated on the surface of metal matrix powder, the combination between the metal matrix powder and the graphene is reliable, and not liable to fall, and the method disclosed by the invention is adapted to large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing graphene-coated metal matrix composite powder by vapor phase deposition. technical background [0002] Graphene (graphene) was first obtained by Novoselov et al. of the University of Manchester in 2004 by using tape to peel off highly oriented pyrolytic graphite. It is a new material with a two-dimensional honeycomb lattice structure closely packed with carbon atoms. According to the number of layers, it can be divided into single-layer graphene and multi-layer graphene, and the thickness is generally below 100nm. Since graphene was artificially prepared, it has become a key research topic in the field of physics and materials science, and has attracted extensive attention from scholars and industrialists. Graphene is the thinnest material known in the world. It has many excellent physical properties, such as light transmittance as high as 97.7%, high thermal conductivity, high electron mobility, and res...

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Problems solved by technology

The chemical synthesis of the reaction solution is one of the main methods. For example, CN102130334A proposes to carry out a hydrothermal reaction in a reaction kettle with an iron salt solution and a graphene oxide mixed solution, and dry the reaction product to obtain a graphene iron oxide composite material; CN101937985A will Graphene oxide and titanium sources are mixed in different proportions, stirred until uniform, the graphene oxide / titania composite material is synthesized by the liquid phase method, and the graphene / titania composite particles are obtained through the reduction reaction, and the composite material can be used for battery anode materials; The main drawback of the method is that the output is less, the materials that can be reacted are limited, and the reaction conditions are difficult to control

The electrochemical method is also one of the main technologies for preparing graphene-containing composite particles. CN102174702 proposes a method for preparing metal nanoparticles-graphene composites. The principle is to insert conductive substrates and working electrodes into graphene oxide-containing and In the aqueous dispersion of metal compounds and depositing graphene oxide and metal compounds on the surface of the working electrode; CN 201410759742 describes the method of depositing nickel on the surface of graphene cathodes by electrophoresis to obtain graphene composite particles; although electrochemical methods can More kinds of graphene-containing composite material particles can be obtained, and the dispersion effect is better, but there are disadvantages such as low output, uncontrollable particle size, and large power consumption

Ball milling mechanical mixing is another method for preparing graphene / metal composite powders. For example, CN104862508A describes that aluminum alloy powder is added to the graphene solution, and then it is loaded into ball milling pot and carried out mechanical ball milling. The ball milling time is 20 to 40 hours After ball milling, put the mixed solution into a beaker and dry it in an oven to obtain a graphene / aluminum alloy composite powder that can be used in the subsequent powder forming process; WO2015149385A1 describes mixing a monodisperse graphene solution with metal powder and then ball milling , and then put the mixed powder into the package and seal the process, the resulting product can be used for hot isostatic pressing to make metal sheets, although the ball milling method can be applied to mix most types of metal powder and graphene, and the output is relatively high, However, they often have disadvantages such as cumbersome preparation process, high energy consumption, and long time consumption.

In addition, the destructive effect of the ball on the matrix powder and graphene during the ball milling process will also reduce the quality of the composite powder.

Moreover, the re-agglomeration of graphene during drying and transportation will also affect the uniformity of graphene in the composite powder.

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