TWM525437U - Natural graphite-aluminum composite heat sink fin - Google Patents

Description

Natural graphite-aluminum composite heat sink

The present invention relates to the field of heat dissipation and electromagnetic shielding of heating elements of electronic products, and in particular to a natural graphite-aluminum composite heat sink.

The current CPU is hot due to high-speed operation, and the high-speed operation of the CPU is developed to improve the processing speed of its equipment. The demand for mobile phones, tablets, notebooks and TVs and the use of displays have increased, while the demand for high brightness of displays has increased the use of light-emitting diodes, but the more LEDs are used, the more power is consumed. This also increases the heat of the device. At the same time, the battery power consumption increases, and the battery capacity also needs to be increased, so that the display device generates more heat due to large energy consumption. If the heat can not be effectively controlled, not only the high temperature will cause the CPU to run due to high heat, but also cause problems or loss of function, and the service life of the heating device will be shortened. At the same time, the functions of display devices are increasing, the number of used components is diversified, the number is large, and the volume is smaller. As a result, devices such as mobile phones and tablet computers are becoming more and more miniaturized, resulting in insufficient available space and closer distances between components and components. It is easy to cause mutual electromagnetic interference.

At present, the thickness of artificial graphite as a heat dissipating material on the market is dominated by 25μm; 40μm artificial graphite can achieve mass production, but the thermal conductivity is not good; the mass productivity of 70μm artificial graphite is not high, and its thickness limits the heat dissipation of artificial graphite. performance. More heat needs to be solved, in order to transfer heat from the "A" point of the heating element to other points, thereby reducing the temperature of the heating element, so that the body temperature of the heating element "A" is greatly reduced. Therefore, a heat conducting carrier having a higher thermal conductivity and a larger heat dissipation capability is required.

In order to solve the above technical problems, the present invention provides a natural graphite-aluminum composite heat sink which is a heat conductive carrier having an excellent heat conduction effect and also provides an electromagnetic mask function.

A natural graphite-aluminum composite heat sink comprising an aluminum foil layer and a graphite layer on the upper and lower sides of the aluminum foil layer; the aluminum foil layer comprises an aluminum substrate and a rough layer on the upper and lower sides of the aluminum substrate; the surface of the rough layer is evenly distributed with holes The roughened layer is interlocked with the graphite layer by the holes.

The aluminum substrate, the roughened layer and the holes are an integrated structure.

The thickness of the natural graphite-aluminum composite heat sink is 28 μm to 2100 μm; the thickness of the aluminum foil layer is 8 μm to 100 μm; the surface area of the roughened layer is 3 to 8 times that of the aluminum substrate; and the thickness of the graphite layer is 10 μm to 1000 μm.

The natural graphite-aluminum composite heat sink has a graphite layer/aluminum foil layer/graphite layer as a unit layer; it can form a composite structure of up to 10 unit layers.

The advantages of this creation:

1. A natural graphite-aluminum composite heat sink created by the present invention uses a graphite layer and an aluminum foil layer to bite each other by holes, so that the adhesion of the aluminum foil and the graphite is greatly increased, and the thermal resistance of the interface between the aluminum foil and the graphite is smaller, and the Z-axis direction The thermal conductivity is greatly improved, and the heat conduction performance of the heat sink is excellent; the thermal conductivity is 400 W/m·K to 1200 W/m·K, and the thermal diffusion coefficient is as high as 200 mm 2 /s to 700 mm 2 /s; due to the addition of the aluminum substrate, It also has an excellent electromagnetic shielding effect, so that each component in a small device can effectively prevent electromagnetic interference;

Second, the natural graphite-aluminum composite heat sink created by the present invention has the characteristics of being stretch-resistant, bendable by 180 degrees, and has high mechanical properties.

In order to further understand the present invention, the present invention will be further described in detail below with reference to the drawings and embodiments. This embodiment is only used to explain the present invention and is not intended to limit the scope of the invention.

Example

As shown in FIG. 1 and FIG. 2, the natural graphite-aluminum composite heat sink prepared by the method for preparing the natural graphite-aluminum composite heat sink of the present embodiment comprises an aluminum foil layer 1 and a graphite layer 2 on the upper and lower sides of the aluminum foil layer 1. The aluminum foil layer 1 comprises an aluminum substrate 11 and a roughened layer 12 on the upper and lower sides of the aluminum substrate 11; the surface of the roughened layer 12 is evenly distributed with holes 13; the roughened layer 12 is intertwined with the graphite layer 2 by the holes 13; The aluminum substrate 11, the roughened layer 12 and the holes 13 are an integrated structure; the natural graphite-aluminum composite heat sink has a thickness of 28 μm to 2100 μm; the aluminum foil layer 1 has a thickness of 8 μm to 100 μm; and the roughened layer 12 has a surface area of aluminum. The material 11 is 3 to 8 times; the graphite layer 2 has a thickness of 10 μm to 1000 μm.

The hole 13 in the aluminum foil layer 1 of the present embodiment not only increases the surface area, but also makes the adhesion of aluminum and graphite more compact; the roughened aluminum surface is uneven, the surface area is extremely large, and the holes 13 are scattered and the holes 13 are scattered. The shapes are different; the graphite 13 does not fall off due to the grip of the hole 13 and is resistant to bending.

The bite force of the graphite layer 2 of the present embodiment and the aluminum foil layer 1 is greater than the bite force between the two graphite layers 2, thereby increasing the adhesion between the graphite layer 2 and the aluminum substrate 11.

The natural graphite-aluminum composite heat sink of the embodiment can be arbitrarily adjusted in thickness in different requirements, and can be arbitrarily adjusted within the scope of the process to meet different application requirements; the graphite layer 2 / aluminum foil layer 1 / graphite layer 2 is A unit number of layers, which can be arbitrarily adjusted in thickness for different requirements, and adjusted to a maximum of 10 layers within the scope of the process to meet different application requirements.

In the present embodiment, the graphite layer 2 enters the hole 13 distributed on the aluminum foil layer 1 in the Z-axis direction; and the graphite material 2 enters the hole 13 after the graphite layer 2 enters the hole 13 by using the same characteristics of the same thermal conductivity of aluminum. The force is not easy to fall off; more because of the addition of aluminum, the Z-guide thermal property of aluminum compensates for the shortcomings of the poor thermal properties of the graphite layer 2Z, and the Z-guide heat of the entire composite heat sink is improved by the addition of aluminum.

The natural graphite-aluminum composite heat sink of the embodiment has a thermal conductivity of 400 W/m·K to 1200 W/m·K, and a thermal diffusion coefficient of 200 mm 2 /s to 700 mm 2 /s; due to the aluminum substrate 11 in the composite heat sink The addition can be fixed by metal bolts in the equipment assembly and connected to the ground end, and the grounding loop is formed by the conductive properties of aluminum; and the heat sink covers the wafer of the device, directly covering the most disturbing wafer To form the best electromagnetic screen ; effect; anti-high frequency interference capability is 60~80db (10MHz~1GHz); due to the addition of aluminum substrate 11, the tensile fracture value in the XY direction (horizontal direction) is 50Kgf/mm2 ~100Kgf/mm2, which is 50 times of the same thickness of graphite sheet, and is 5 times of the same thickness of artificial graphite sheet; regardless of the thickness of the composite sheet, the bending angle is 180 degrees, and the number of bendable times is 50 times. Without the fracture of the natural graphite-aluminum composite heat sink, the heat dissipation performance is reduced, which is unmatched by a single graphite heat sink that cannot withstand bending greater than 90 degrees and cannot withstand multiple bends.

The above embodiments are not intended to limit the present invention in any way, and all the technical means obtained by means of equivalent replacement or equivalent conversion fall within the scope of the patent application of the present invention.

1‧‧‧Aluminum foil layer
11‧‧‧Aluminum substrate
12‧‧‧ rough layer
13‧‧‧ hole
2‧‧‧ graphite layer

1 is a schematic view showing the structure of a natural graphite-aluminum composite heat sink of the embodiment.

2 is an enlarged schematic view showing an aluminum foil layer of a natural graphite-aluminum composite heat sink of the embodiment.

1‧‧‧Aluminum foil layer

13‧‧‧ hole

2‧‧‧ graphite layer

Claims (4)

A natural graphite-aluminum composite heat sink comprises: an aluminum foil layer and a graphite layer on the upper and lower sides of the aluminum foil layer; the aluminum foil layer comprises an aluminum substrate and a rough layer on the upper and lower sides of the aluminum substrate; The surface of the layer is evenly distributed with a hole; the rough layer is interlocked with the graphite layer by the hole. The natural graphite-aluminum composite heat sink according to claim 1, wherein the aluminum substrate, the roughened layer and the hole are an integrated structure. The natural graphite-aluminum composite heat sink according to claim 1, wherein the natural graphite-aluminum composite heat sink has a thickness of 28 μm to 2100 μm; the aluminum foil layer has a thickness of 8 μm to 100 μm; and the surface area of the roughened layer It is 3 to 8 times of the aluminum substrate; the thickness of the graphite layer is 10 μm to 1000 μm. The natural graphite-aluminum composite heat sink according to claim 1, wherein the natural graphite-aluminum composite heat sink has the graphite layer/the aluminum foil layer/the graphite layer as a unit layer, which can form up to 10 Unit layer composite structure.