A graphene metal composite multilayer heat sink with high thermal conductivity and preparation method thereof

Abstract

The invention discloses a high-heat-conduction-performance graphene metal composite multi-layer radiator and a preparing method thereof, and belongs to the technical field of heat dissipation. The radiator comprises a metal base layer, a graphene film layer evenly deposited on the surface of the metal base layer, and a welding part. The preparing method of the high-heat-conduction-performance graphene metal composite multi-layer radiator comprises the following steps that graphene powder and an additive are added in an absolute ethyl alcohol solution, and evenly-scattered graphene dispersion liquid is obtained through ultrasonic scattering; equal-thickness strip-shaped metal sheets are adopted and subjected to surface treatment through dilute nitric acid, deionized water, absolute ethyl alcohol and ultrasonic waves, and then the equal-thickness strip-shaped metal sheets serve as a cathode; the cathode and an anode are jointly immersed in the graphene dispersion liquid to be subjected to electrophoretic deposition; then after the metal base layer is tightly rolled into a multi-layer cylinder from one end, the other end of the metal base layer is welded and fixed to the outer side of the cylinder to be subjected to annealing treatment, and the cake-shaped graphene metal composite multi-layer radiator is formed through cutting in the direction perpendicular to the axial direction of the cylinder. The radiator is high in heat dissipation efficiency, the technology is simple, energy saving and environment friendliness are achieved, cost is low, and the heat dissipation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation, and in particular relates to a graphene metal composite multilayer radiator with high thermal conductivity and a preparation method thereof. Background technique [0002] Graphene is a quasi-two-dimensional material with ultra-light, ultra-thin, ultra-strong and ultra-large specific surface area, with a surface density of about 0.77mg / m 2 , the thickness of single-layer graphene is about 0.34nm, the toughness of graphene is excellent, the elastic modulus is 1.0TPa, the microscopic strength can reach 30GPa, which is more than 100 times that of traditional steel, and the theoretical specific surface area is 2630m 2 / g, and has very high electrical and thermal conductivity, such as a resistivity of 2×10 -6 Ω.cm, electron mobility up to 2×10 5 cm 2 / V.S, the horizontal thermal conductivity at room temperature is about 5×10 3 W / m.K. At the same time, graphene has high thermal stability, ...

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Problems solved by technology

However, because graphene is easy to agglomerate, problems such as uneven dispersion and inconsistent tendency of graphene appear in the above-mentioned preparation of composite materials, which lead to a reduction in the heat dissipation effect of graphene composite materials.

In addition, in the first method, organic coatings are often used to bond the graphene and the surface of the metal substrate, and the thermal conductivity of general organic coatings is very low, which is not conducive to the improvement of heat dissipation performance.

The latter two methods are commonly used methods to improve the comprehensive properties of metals, but the process is more complicated, the energy consumption is large, and oxidation or interfacial reactions may occur during high-temperature sintering, resulting in a decrease in material properties.

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