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A kind of graphite composite heat sink and preparation method thereof

A technology of composite heat sink and graphite sheet, applied in chemical instruments and methods, cooling/ventilation/heating transformation, modification by conduction heat transfer, etc., can solve the restriction of thermal conductivity, low thermal conductivity of graphite sheet, and insufficient thermal conductivity. Ideal and other issues, to achieve the effect of excellent thermal conductivity, increased longitudinal thermal conductivity, and low cost

Active Publication Date: 2022-05-27
SHENZHEN HANKE NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the development of the electronics industry, the heating problem of electronic equipment has always been a problem that the industry expects to solve. Among them, the use of materials with high thermal conductivity to make heat sinks is one of the solutions, and graphite sheets rely on their excellent thermal conductivity. The conductivity stands out from many materials, but the thermal conductivity of graphite sheet in its longitudinal direction (thickness direction) is low, which restricts the improvement of its thermal conductivity
The way to increase the thickness of the graphite sheet is to glue the multi-layer graphite sheet together to form a heat sink, but this method is still not ideal for improving the thermal conductivity

Method used

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  • A kind of graphite composite heat sink and preparation method thereof
  • A kind of graphite composite heat sink and preparation method thereof
  • A kind of graphite composite heat sink and preparation method thereof

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preparation example Construction

[0028] Please refer to Figure 1 to Figure 5 , a method for preparing a graphite composite heat sink, comprising the following steps:

[0029] A metal coating layer 2 is formed by depositing a metal material on the surface of the graphite sheet 1;

[0030] Laminate a plurality of graphite sheets 1 with metal plating layers 2 to obtain a laminate;

[0031] The laminated body is rolled with a hot pressing roll.

[0032] The principle of the present invention is briefly described as follows: when the hot pressing roller is working, heat is transferred to the metal coating between two adjacent graphite sheets through the graphite sheet, so that the metal coating is melted, and pressure is applied to the graphite sheet at the same time, and the metal to be melted is melted. After the coating is solidified, the two adjacent layers of graphite sheets are fixedly connected together. The raw material of the metal coating is metal, and its thermal conductivity is much higher than tha...

Embodiment 1

[0051] Please refer to figure 1 and figure 2 , the first embodiment of the present invention is: a graphite composite heat sink, which is not only used for the heat dissipation of mobile terminal equipment, such as electronic equipment such as mobile phones and tablet computers, but also for the heat dissipation of office equipment such as printers and copiers. Of course, it can also be used for heat dissipation. for heat dissipation of other devices with heat dissipation requirements.

[0052] The preparation method of the graphite composite heat sink is as follows:

[0053] S1, adopt magnetron sputtering method to deposit low melting point high thermal conductivity metal material on the surface of graphite sheet 1 to form metal coating 2, in this embodiment, described low melting point high thermal conductivity metal material is tin;

[0054] S2, stacking a plurality of graphite sheets 1 with metal coating layers 2 to obtain a laminate;

[0055] S3, using a hot pressing ro...

Embodiment 2

[0063] Please refer to figure 1 and figure 2 , the second embodiment of the present invention is: a graphite composite heat sink, which is not only used for the heat dissipation of mobile terminal equipment, such as electronic equipment such as mobile phones and tablet computers, but also for the heat dissipation of office equipment such as printers and copiers. Of course, it can also be used for heat dissipation. for heat dissipation of other devices with heat dissipation requirements.

[0064] The preparation method of the graphite composite heat sink is as follows:

[0065] S1, adopt the evaporation method to deposit a low melting point and high thermal conductivity metal material on the surface of the graphite sheet 1 to form a metal coating layer 2, in this embodiment, the low melting point and high thermal conductivity metal material is aluminum;

[0066] S2, stacking a plurality of graphite sheets 1 with metal coating layers 2 to obtain a laminate;

[0067] S3, usin...

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Abstract

The invention discloses a graphite composite heat sink and a preparation method thereof. The preparation method of the graphite composite heat sink comprises the following steps: depositing a metal material on the surface of the graphite sheet to form a metal coating; stacking a plurality of graphite sheets with the metal coating to obtain A laminated body; rolling the laminated body with a hot pressing roller. There is no adhesive inside the graphite composite heat sink prepared by the graphite composite heat sink preparation method, and the adjacent two layers of graphite sheets are connected by thermocompression using the low-melting point metal coating on the surface to achieve the purpose of obtaining a thicker graphite composite heat sink. Maintaining the heat conduction advantage of the graphite composite heat sink in the horizontal direction can increase the longitudinal heat conduction performance of the graphite composite heat sink, so that the graphite composite heat sink has an excellent heat conduction effect, and the preparation process of the graphite composite heat sink is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a graphite composite heat sink and a preparation method thereof. Background technique [0002] In recent years, with the development of the electronic industry, the heating problem of electronic equipment has always been a problem that the industry expects to solve. Among them, using materials with high thermal conductivity to make heat sinks is one of the solutions. The conductivity stands out from many materials, but the thermal conductivity of the graphite sheet in its longitudinal direction (thickness direction) is low, which restricts the improvement of its thermal conductivity. [0003] In order to improve the thermal conductivity, the industry usually adopts the method of increasing the thickness of the graphite sheet to increase the overall heat capacity of the heat sink, so that when the same heat is absorbed, the temperature of the heat sink increases less;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B7/14B32B37/00B32B37/10B32B37/12B32B37/24B32B38/00H05K7/20
CPCB32B9/007B32B9/04B32B7/14B32B37/1284B32B37/10B32B37/24B32B37/0076B32B38/00H05K7/2039B32B2037/246B32B2307/302
Inventor 王荣福
Owner SHENZHEN HANKE NEW MATERIAL TECH CO LTD
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