A kind of natural graphite/metal layer composite heat sink and its preparation method

Abstract

The invention discloses a natural graphite / metal-layer composite heat sink. The natural graphite / metal-layer composite heat sink comprises a metal layer and natural graphite layers, wherein the natural graphite layers are arranged on the upper surface and the lower surface of the metal layer, a plurality of round holes are uniformly formed in the metal layers, the diameters of the round holes are 0.2-0.6 millimeter, the distance between the round holes is 0.4-1.0 millimeter, upward or downward burrs are arranged at the edges of the round holes, the natural graphite layers are engaged with the metal layer by the burrs, the round holes are filled with natural graphite, and the thickness of the composite heat sink is 18-2,000 micrometers. Through the above mode, the natural graphite / metal-layer composite heat sink is a favorable heat conduction carrier, has a high heat conduction effect and also has a high electromagnetic shielding function.

Description

technical field [0001] The invention relates to the field of heat dissipation and electromagnetic shielding of heating components in electronic products, in particular to a natural graphite / metal layer composite heat sink and a preparation method thereof. Background technique [0002] In the prior art, with the increase in the demand for mobile phones, tablet computers, or notebook computers and TVs and the increase in the use of display screens, the demand for high brightness of display screens increases the use of light-emitting diodes. In order to improve the operation of various electronic products Speed, at present, the CPU in various electronic products will emit a lot of heat due to high-speed operation, which also increases the heat generation of the device. At the same time, the battery power consumption increases, and the battery capacity also increases, which makes the display device heat due to increased energy consumption What's more, if the heat generation cann...

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Problems solved by technology

[0002] In the prior art, with the increase in the demand for mobile phones, tablet computers, or notebook computers and TVs and the increase in the use of display screens, the demand for high brightness of display screens increases the use of light-emitting diodes. In order to improve the operation of various electronic products Speed, at present, the CPU in various electronic products will emit a lot of heat due to high-speed operation, which also increases the heat generation of the device. At the same time, the battery power consumption increases, and the battery capacity also increases, which makes the display device heat due to increased energy consumption More, if the heating cannot be effectively controlled, the high temperature will not only make the CPU run out of order or lose its function, but also shorten the service life of the heating equipment

At the same time, the functions of display devices are increasing, and the parts used are also diversified. The number is large and the volume is smaller. The available space of the display device is more insufficient, and the distance between the components is closer, which is prone to interference.

[0003] When the thickness of artificial graphite (that is, the interface area cannot be expanded again, due to the characteristics of polyimide film) and the thicker breakability of natural graphite (greater than 75 microns), it loses its inherent X and Y axes thermal conductivity problem

At present, the thickness of artificial graphite used as a heat dissipation material in the market is mainly 25uM. 40uM is mass-produced but the thermal conductivity is not good. The mass-producibility of 70uM is not high. More heat needs to be solved. We have to transfer the heat from the heating components The "A" point is transmitted to other points for distribution, so that the body temperature of the heating component "A" is greatly reduced

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