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Carbon nanotube heat conducting sheet and preparation method thereof

A technology of carbon nanotubes and carbon nanotube arrays, which is applied in the field of carbon nanotube heat conduction sheet and its preparation, can solve the problems that the thermal conductivity rate needs to be improved, and the heat conduction performance of the heat conduction sheet is not ideal.

Active Publication Date: 2022-01-04
SHENZHEN XIWAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, it is found that the thermal conductivity of carbon nanotube heat conducting sheets in the form of aligned carbon nanotube arrays is still not ideal, and the thermal conductivity rate still needs to be improved.

Method used

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  • Carbon nanotube heat conducting sheet and preparation method thereof
  • Carbon nanotube heat conducting sheet and preparation method thereof
  • Carbon nanotube heat conducting sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The structure of the carbon nanotube heat conducting sheet of embodiment 1 is as figure 1 As shown, the carbon nanotube heat conducting sheet in Example 1 is composed of a carbon nanotube array, a transition layer stacked on the upper and lower surfaces of the carbon nanotube array, and a wetting layer stacked on the transition layer. Among them, the length of each carbon nanotube in the carbon nanotube array is 300 μm, and the surface density of the carbon nanotube in the carbon nanotube array is 108 g / m 2 The material of the transition layer stacked on the upper surface and the lower surface of the carbon nanotube array is Au, and the thickness of the transition layer is 600nm; the material of the wetting layer stacked on the transition layer is indium, and the thickness of the wetting layer is 50 μm. The preparation method of the carbon nanotube heat conducting sheet of embodiment 1 comprises the following steps:

[0082] (1) Preparing an initial carbon nanotube arr...

Embodiment 2

[0088] The structure of the carbon nanotube heat conducting sheet of embodiment 2 is as figure 1 As shown, the carbon nanotube heat conducting sheet in Example 2 is composed of a carbon nanotube array, a transition layer stacked on the upper and lower surfaces of the carbon nanotube array, and a wetting layer stacked on the transition layer. Among them, the length of each carbon nanotube in the carbon nanotube array is 300 μm, and the surface density of the carbon nanotube in the carbon nanotube array is 108 g / m 2 The material of the transition layer stacked on the upper surface and the lower surface of the carbon nanotube array is Au, and the thickness of the transition layer is 600nm; the material of the wetting layer stacked on the transition layer is bismuth alloy (33.0Bi-67.0In), and the infiltration The thicknesses of the layers were all 50 μm.

[0089] The preparation method of the carbon nanotube heat conducting sheet of Example 2 is roughly the same as that of Exampl...

Embodiment 3

[0091] The structure and preparation method of the carbon nanotube heat conducting sheet of Example 3 are roughly similar to those of Example 1, the difference being that the areal density of the carbon nanotubes in the carbon nanotube array in the carbon nanotube heat conducting sheet structure of Example 3 is 55g / m 2 .

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Abstract

The invention relates to a carbon nanotube heat conduction sheet and a preparation method thereof. The carbon nanotube heat conduction sheet includes a carbon nanotube array, a transition layer and an infiltration layer. The carbon nanotube array has a plurality of carbon nanotubes arranged in an orientation. With end faces, the areal density of the carbon nanotubes in the carbon nanotube array is 55g / m 2 ~165g / m 2 The transition layer is located on the end surface, and the material of the transition layer is selected from at least one of Au, Ti and Pt; the wetting layer is located on the transition layer, and the material of the wetting layer is a low melting point metal with a melting point of 29.8°C to 300°C. The above-mentioned carbon nanotube heat conducting sheet has good heat conducting performance.

Description

technical field [0001] The invention relates to the technical field of carbon nanotubes, in particular to a carbon nanotube heat conducting sheet and a preparation method thereof. Background technique [0002] Carbon nanotubes have the advantages of high thermal conductivity, high temperature resistance and flexibility, and are good heat dissipation materials for microelectronic devices. The early carbon nanotube heat conduction sheet is a thin sheet formed by mixing carbon nanotubes into polymer materials such as resin and rubber. However, due to the low thermal conductivity of these polymer materials and the anisotropic thermal conductivity of carbon nanotubes, the early carbon nanotube heat conduction sheets had poor thermal conductivity. [0003] With the advancement of science and technology, it is found that the carbon nanotube arrays grown in an orientation have good radial thermal conductivity. Therefore, the carbon nanotubes on the carbon nanotube heat conduction s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C01B32/168
CPCC09K5/14C01B32/168C01B2202/20C01B2202/34C01B2202/36C01B2202/24
Inventor 李承献邓飞
Owner SHENZHEN XIWAN TECH CO LTD