Preparing method for graphene metal heat conduction gasket

Abstract

The invention discloses a preparing method for a graphene metal heat conduction gasket. The preparing method includes the following steps that firstly, a graphene oxide dispersion solution is prepare, graphene oxide is dispersed into a solvent, a modifying agent is used for conducting surface treatment on the graphene, and the graphene oxide dispersion solution is mixed to be acid; secondly, foam metal is pretreated, wherein an oxide layer is formed on the surface of the foam metal through electrochemical oxidation; thirdly, the graphene-loaded foam metal is prepared, wherein the graphene oxide dispersion solution and a reducing agent are mixed into a mixed solution, the foam metal is immersed in the mixed solution, and sealing heat treatment is conducted under the temperature ranging from 80 DEG C to 350 DEG C; and fourthly, the graphene heat conduction gasket is prepared, wherein after the graphene-loaded foam metal is filled with a paste heat conduction material, the heat conduction material is cured, and the graphene-loaded foam metal filled with the heat conduction material is pressed into a sheet. The obtained graphene metal heat conduction gasket is high in heat conduction coefficient and can be well applied to large-power LED illumination lamps.

Description

[0001] [technical field] [0002] The invention relates to the preparation of heat-conducting materials, in particular to a method for preparing a graphene metal heat-conducting pad. [0003] [Background technique] [0004] As the power of LEDs increases, the problem of heat dissipation becomes more and more serious, which seriously affects the light output characteristics of LEDs and the life of devices. Therefore, heat dissipation has always been a key problem that must be solved for high-power LED packaging. In order to better fill the air gap between the heating element and the heat sink, it is necessary to select a material with good flexibility and thermal conductivity for filling to meet its heat dissipation effect. As high thermal conductivity materials, graphene and metals are widely used as heat conduction and heat dissipation materials. In recent years, there have been many reports on the composite preparation of graphene and metal foam to prepare graphene metal comp...

AI Technical Summary

Problems solved by technology

As high thermal conductivity materials, graphene and metals are widely used as heat conduction and heat dissipation materials. In recent years, there have been many reports on the composite preparation of graphene and metal foam to prepare graphene metal composite materials. These composite methods include the use of chemical vapor deposition ( CVD method) (for example: patent 201510980259.1 "A method for rapidly growing graphene flower cluster array on nickel foam" and patent 201010183833.8 "graphene foam and its preparation method") and electrophoretic deposition method (for example: patent 201310360855.0 "metal foam - Graphene composite material and its preparation method ") etc. to grow graphene on metal substrates, but these operating methods require too harsh and complicated process conditions and are not easy to operate

At the same time, graphene may be filled on the metal surface by coating, but it is not uniform and stable, and it is easy to fall off, which affects its excellent performance.