Carbon nano tube composite graphite film for heat dissipation

Abstract

The invention discloses a carbon nano tube composite graphite film for heat dissipation. The carbon nano tube composite graphite film comprises a graphite heat-conduction layer and a carbon nano tube heat-dissipation layer which are compounded with each other, wherein the graphite heat-conduction layer is provided with a first surface and a second surface which are opposite to each other; the first surface and / or the second surface is at least coated with a layer of carbon nano tube heat-dissipation layer. Compared with the prior art, the carbon nano tube composite graphite film has the advantages that the heat dissipation capability of the graphite heat-conduction layer in a vertical direction is enhanced because the surface of the graphite heat-conduction layer is directly coated with the carbon nano tube heat-dissipation layer; meanwhile, the graphite heat-conduction layer has better excellent mechanical performance and flexibility due to the coating of an organic coating, and the using performance of the graphite heat-conduction layer is remarkably improved; a simple and convenient using and coating manner can be applicable to efficient coating of graphite substrates of different morphologies, and thus the carbon nano tube composite graphite film has important commercial value in large-scale application.

Description

technical field [0001] The invention belongs to the technical field of heat conducting materials, in particular to a carbon nanotube composite graphite film for heat dissipation. Background technique [0002] With the development trend of high power and miniaturization of electronic devices, efficient heat dissipation has become a key bottleneck restricting device performance and structural design. A large number of electronic devices are integrated in a small space, which makes it impossible for traditional cooling devices to obtain enough installation space, which greatly restricts the development of micro devices. High thermal conductivity graphite film is a graphite film material with ultra-high thermal conductivity in the horizontal direction. In the microstructure, the highly crystalline graphite sheet structure is precisely stacked together along the horizontal direction, and its thermal conductivity can even reach 1500-2000 W / mK, which is the material with the high...

AI Technical Summary

Problems solved by technology

However, the graphite sheets in the high thermal conductivity graphite film are stacked along the horizontal direction, so that the thermal conductivity in the thickness direction is particularly poor, often only tens of W / mK, or even lower

In the prior art, the thermal conductivity in the thickness direction is generally improved by filling the high thermal conductivity graphite film with thermally conductive fillers, but this attempt often leads to a decline in the structural integrity and mechanical properties of the graphite film.

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