Preparation method of graphite/carbon nano-tube array composite heat conducting film

Abstract

The invention relates to a preparation method of a graphite / carbon nano-tube array composite heat conducting film. The preparation method comprises the following steps: (1) supporting a catalyst layer or a catalyst precursor layer on the surface of a graphite film; (2) placing the graphite film in chemical vapor deposition equipment, depositing carbon nano-tube arrays after carrying out reduction treatment to obtain a heat conducting graphite film of which the surface is deposited with the carbon nano-tube arrays; (3) carrying out graphitization on the heat conducting graphite film of which the surface is deposited with the carbon nano-tube arrays to obtain the graphite / carbon nano-tube array composite heat conducting film. According to the invention, a special method of depositing the highly oriented carbon nano-tube arrays on the surface is adopted, so that the effective radiation area of the heat conducting graphite film is obviously increased, and the interfacial thermal resistance between the conducting film and air is reduced to obviously improve the heat transfer rates of the heat conducting film with surrounding environments such as the air per unit area to rapidly diffuse heat from the heat conducting film to the surrounding environments such as air.

Description

technical field [0001] The invention belongs to the technical field of heat conduction and heat dissipation, and relates to a preparation method of a graphite / carbon nanotube array composite heat conduction film. Background technique [0002] In recent years, graphite film materials have been widely used in technical fields such as heat dissipation of electronic products, heat-resistant sealing materials, and heating elements due to their excellent high thermal conductivity, heat resistance, corrosion resistance, and high electrical conductivity. Graphite film with high thermal conductivity is widely used in handheld terminals such as smartphones and tablet computers with dense electronic components and high heat generation, and realizes heat dissipation through high thermal conductivity. [0003] At present, by directly carbonizing and graphitizing organic polymer film materials, graphite film materials with high thermal conductivity, high electrical conductivity, and bendi...

AI Technical Summary

Problems solved by technology

However, this material has the following defects: carbon nanotubes and graphite sheets are connected only by surface adhesion, and the integrity and continuity of the final product are poor; The specific surface area is reduced, and the effective radiation area cannot be increased; the carbon nanotubes are randomly distributed, and the directionality is poor, and the heat cannot be conducted and diffused in the preset direction

In the existing preparation methods of graphite and carbon nanotube composite film materials, the coating method and the full wet filtration method cannot form a highly oriented composite of carbon nanotube arrays and graphite film due to the randomness of the distribution caused by the dispersion of carbon nanotubes. thin film material; while the random distribution of vapor-deposited carbon nanotube particles causes the non-orientation of carbon nanotubes, and it is also impossible to form a composite thin film material of highly oriented carbon nanotube arrays and graphite film

This means that none of the above materials can greatly increase the effective radiation area, so the heat cannot be quickly and directionally diffused to the surrounding environment such as air.

In addition, the existing composite film materials of graphite and carbon nanotubes all introduce carbon nanotubes on the basis of the formed graphite film. The process is relatively complicated, and the original production equipment has been greatly modified, which is not conducive to continuous production.

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