Preparing method for aluminum base graphene and carbon nano tube composite heat dissipation material

Abstract

The invention relates to a preparing method for an aluminum base graphene and carbon nano tube composite heat dissipation material, and belongs to the technical field of heat dissipation material preparing. The method comprises the steps that equivalent graphene, carbon nano tube powder and aluminum salt are added in an absolute ethyl alcohol solution, and evenly-scattered graphene and carbon nano tube mixed electrophoresis liquid is obtained through ultrasonic scattering; and after being subjected to surface treatment through dilute nitric acid, deionized water, absolute ethyl alcohol and ultrasonic waves, aluminum base sheets serve as a cathode; graphite sheets serve as an anode, and the cathode and the anode are immersed in the mixed electrophoresis liquid to be subjected to electrophoretic deposition; then, the aluminum base sheets are stacked into multiple layers from one end, cold press forming is conducted, the other ends of the aluminum base sheets wrap the outer face of a pressed and formed sample by one circle, and the other ends of the aluminum base sheets are welded and fixed to the side face of the sample; and annealing treatment is conducted at the nitrogen atmosphere, and accordingly the aluminum base graphene and carbon nano tube composite heat dissipation material is obtained. According to the method, the technology is simple, energy saving and environment friendliness are achieved, cost is low, and the prepared composite heat dissipation material is high in heat dissipation efficiency and high in mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of preparation of heat dissipation materials, in particular to a preparation method of aluminum-based graphene and carbon nanotube composite heat dissipation materials. Background technique [0002] High heat is generally generated in electronics, electrical components, microprocessors and integrated circuits of high-power optical devices. If the heat generated by these electronic components exceeds its allowable range, it will not only affect their own performance, but may also It will cause immeasurable damage to the performance and stability of the entire system, causing the system to crash. The performance, reliability and life of electronic and electrical equipment are inversely proportional to the temperature of the operating environment. For example, in high-power LED or liquid crystal modules, the improvement of substrate heat dissipation speed can greatly improve their brightness, life and operatio...

AI Technical Summary

Problems solved by technology

However, since graphene and carbon nanotubes are all relatively easy to agglomerate, problems such as uneven dispersion or inconsistency of graphene and carbon nanotubes appear in the composite material prepared by the above method, thereby reducing the heat dissipation of graphene or carbon nanotube composite materials. Effect

In addition, in the first method, organic coatings are often used to bond between graphene or carbon nanotubes 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 aluminum matrix composites, but the process is more complicated, time-consuming and energy-consuming, especially in the third method, oxidation or interfacial reactions may occur during high-temperature sintering. leading to a reduction in material performance

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