Graphite aluminum-metal composite heat conduction block and graphite aluminum-metal composite heat conduction sheet

Abstract

The utility model discloses a graphite aluminum-metal composite heat conduction block and a graphite aluminum-metal composite heat conduction sheet, and relates to the field of heat dissipation materials. The graphite aluminum-metal composite heat conduction block is composed of a graphite-aluminum heat conduction block body and a metal frame, the graphite-aluminum heat conduction block body is embedded in the metal frame, combination teeth are arranged on the surface, connected with the metal frame, of the graphite-aluminum heat conduction block body, and combination grooves are formed in the corresponding positions of the metal frame. Graphite areas in the graphite-aluminum heat conduction block are directionally arranged in the aluminum matrix, the surface area of the aluminum matrix accounts for 40%-50%, and the graphite content is higher than 40%. The metal frame is made of aluminum or aluminum alloy and is combined with the graphite-aluminum heat conduction block, and the graphite-aluminum-metal composite heat conduction sheet is formed by cutting the graphite-aluminum-metal composite heat conduction block. According to the graphite-aluminum heat conduction block, the graphite-aluminum heat conduction sheet and the metal frame are well combined, and the whole graphite-aluminum heat conduction block has good structural strength.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat dissipation material field especially relates to a graphite aluminum - metal composite heat conducting block and graphite aluminum - metal composite heat conducting sheet. BACKGROUND

[0002] With the development of communication technology, the degree of integration of electronic products is higher and higher, and electronic components are miniaturized, leading to increased power and heat flux density, thus increasing the demand for high thermal conductivity heat dissipation devices. The thermal conductivity of the existing graphite-aluminum material with high graphite content is much higher than that of copper and aluminum heat dissipation materials in the market, but high graphite content can reduce the strength of the graphite-aluminum material.

[0003] In view of the problems of poor mechanical properties of graphite-aluminum material with high graphite content, brittle change such as crack of graphite-aluminum material, and limited application scenarios, researchers in the prior art have set a metal frame outside the graphite-aluminum material to reinforce the graphite-aluminum material to form a graphite aluminum-metal composite heat conducting block, but due to the difficulty in forming a stable connection between the metal frame and the graphite-aluminum material, the bonding strength of the entire composite heat conducting block of the graphite aluminum-metal composite heat conducting block is still low, and the reinforcement effect is poor.

[0004] Therefore, it is necessary to design a graphite aluminum-metal composite heat conducting block which can form a stable combination between the graphite-aluminum material and the metal frame. SUMMARY

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a graphite aluminum-metal composite heat conducting block, which sets a metal frame around the graphite-aluminum heat conducting block, and sets a rigid engagement structure between the metal frame and the graphite-aluminum heat conducting block, so that the designed graphite aluminum-metal composite heat conducting block has high thermal conductivity and good structural strength.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a graphite aluminum-metal composite heat conducting block, which comprises a graphite-aluminum heat conducting block and a metal frame, the metal frame has at least two opposite openings, and the graphite-aluminum heat conducting block is embedded in the metal frame.

[0008] A combination tooth is arranged on the outer surface of the graphite-aluminum heat conducting block, and a combination groove is arranged on the inner surface of the metal frame at a position corresponding to the combination tooth; the graphite-aluminum heat conducting block and the metal frame are rigidly connected through the combination tooth-combination groove.

[0009] Specifically, the combination tooth is selected from one or more of sawtooth shape, circle, trapezoid, rectangle and semicylindrical shape.

[0010] Specifically, the graphite-aluminum heat-conducting block contains a graphite region and an aluminum matrix, the graphite region is elongated and arranged in the aluminum matrix.

[0011] More specifically, the combination teeth are arranged on the surface of the aluminum matrix in the graphite-aluminum heat-conducting block.

[0012] More specifically, the graphite region and the aluminum matrix are rigidly connected.

[0013] More specifically, the aluminum matrix is an aluminum matrix or an aluminum alloy matrix.

[0014] Still more specifically, the graphite-aluminum heat-conducting block has exposed graphite regions and aluminum matrix regions, and the surface area of the graphite regions accounts for 40-50% of the surface area of the graphite-aluminum heat-conducting block.

[0015] Specifically, the metal frame is an aluminum frame or an aluminum alloy frame.

[0016] Specifically, the length of the graphite-aluminum-metal composite heat-conducting block is 20-250mm.

[0017] The second object of the utility model is to provide a graphite-aluminum-metal composite heat-conducting sheet which is cut from the graphite-aluminum-metal composite heat-conducting block, in particular, is cut in a direction parallel to the opening of the metal frame of the graphite-aluminum-metal composite heat-conducting block.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses a graphite-aluminum-metal composite heat-conducting block, which is embedded in a metal frame, and the graphite-aluminum heat-conducting block is connected with the metal frame through rigid engagement. On the one hand, the graphite-aluminum heat-conducting block is fastened and limited by the metal frame, which effectively prevents the graphite-aluminum heat-conducting block from generating cracks, so that the graphite-aluminum-metal composite heat-conducting block has a stable structure as a whole, thereby improving the heat-conducting efficiency and mechanical strength of the graphite-aluminum-metal composite heat-conducting block. On the other hand, the combination groove-combination teeth arranged on the metal frame and the graphite-aluminum heat-conducting block can improve the spreadability of molten metal on the surface of the graphite-aluminum heat-conducting block, which is conducive to forming a more stable connection between the metal frame and the graphite-aluminum heat-conducting block, thereby effectively improving the strength of the composite heat-conducting block, maintaining the structural stability of the composite heat-conducting block, ensuring the heat-conducting efficiency and lightweight of the composite heat-conducting block, and processing the graphite-aluminum-metal composite heat-conducting sheet through a cutting process, which is widely applicable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The drawing is a structural schematic diagram of the graphite-aluminum-metal composite heat-conducting block.

[0021] Figure 2 A photo of the graphite-aluminum-metal composite heat-conducting block of the embodiment of the present application.

[0022] Figure 3 A scanning electron microscope image of the graphite-aluminum heat-conducting block in the embodiment of the present application.

[0023] Among them: graphite-aluminum heat-conducting block 1, metal frame 2, combined teeth 3. DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0025] It should be noted that in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "periphery", "surrounding" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or it can be detachable connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The present application will be described in further detail below with reference to the drawings:

[0027] As Figure 1 shown, the present application provides a graphite-aluminum-metal composite heat-conducting block, which comprises a graphite-aluminum heat-conducting block 1 and a metal frame 2, the metal frame 2 is wrapped around the graphite-aluminum heat-conducting block 1, and the two are rigidly combined.

[0028] In some embodiments, the graphite content of the graphite-aluminum heat-conducting block 1 is higher than 40%, the graphite sheets are highly oriented in the aluminum matrix, so that the thermal conductivity of the graphite-aluminum heat-conducting block 1 along the length direction of the graphite is greater than 500 W / mK, and the density of the graphite-aluminum heat-conducting block 1 is lower than that of aluminum element, achieving the combination of lightweight and high thermal conductivity.

[0029] In practical application, the high directional arrangement of the graphite sheet region enables heat to be quickly transferred along the plane, achieving the purpose of high efficiency heat dissipation.

[0030] In some embodiments, the aluminum or aluminum alloy accounts for more than 50% of the surface area of the graphite-aluminum heat conducting block 1, and can inter-diffuse with the atoms in the metal frame 2, and easily form a rigid bond.

[0031] The surface of the graphite-aluminum heat conducting block 1 in direct contact with the metal frame 2 is provided with a bonding tooth 3.

[0032] The shape of the bonding tooth 3 can be one or more of sawtooth shape, circular shape, trapezoidal shape, rectangular shape, and semicylindrical shape.

[0033] In some embodiments, the metal frame 2 is a 3003 aluminum alloy metal frame.

[0034] In some embodiments, the metal frame 2 is filled in the bonding tooth 3 to form a rigid connection through a hot pressing process, and the mechanical bonding of the graphite-aluminum heat conducting block 1 and the metal frame 2 is strengthened. The oxide layer on the surface of the metal frame 2 is broken in the deformation process, and the presence of the bonding tooth 3 increases the contact area between the graphite-aluminum heat conducting block 1 and the metal frame 2, forming a non-planar contact, promoting the spread of the molten metal on the surface of the graphite-aluminum heat conducting block, promoting the inter-diffusion of elements in the metal frame 2 and the graphite-aluminum heat conducting block 1, and achieving stable connection of the graphite-aluminum heat conducting block 1 and the metal frame 2.

[0035] In some embodiments, the thickness of the graphite-aluminum heat conducting block 1 and the metal frame 2 is greater than 5mm, which can be cut into a sheet with a thickness of 1mm and applied to a heat equalization scene.

[0036] The photo of the prepared graphite aluminum-metal composite heat conducting block is shown in Figure 2 .

[0037] The graphite-aluminum heat conducting block 1 used in the following embodiments of the utility model is prepared according to the invention patent with the application number 201410215665.4.

[0038] Embodiment 1

[0039] The embodiment provides a graphite aluminum-metal composite heat conducting block, which is processed through the following steps:

[0040] (1) Provide an aluminum-silicon alloy block with a length of 200mm, a width of 40mm, and a thickness of 20mm as the metal frame 2.

[0041] (2) Provide a graphite-aluminum heat conducting block 1 with a length of 150mm, a width of 50mm, and a thickness of 20mm, process a bonding tooth 3 with a depth of about 5mm and a width of 1mm on the contact surface of the graphite-aluminum heat conducting block 1 and the aluminum frame, and clean and dry.

[0042] (3) Put the graphite-aluminum heat-conducting block 1 prepared in step (2) into a special casting mold.

[0043] (4) Bonding:

[0044] Conventional processing mode: Pour the molten aluminum-silicon alloy into the mold, cool, and form a bonding groove on the aluminum-silicon alloy block corresponding to the bonding teeth 3, to obtain a graphite-aluminum-metal composite heat-conducting block, and the bonding teeth-bonding groove are well bonded.

[0045] Example 2

[0046] The graphite-aluminum-metal composite heat-conducting block is processed by the following steps:

[0047] (1) Provide a 1060 aluminum block with a length of 250 mm, a width of 50 mm, and a thickness of 20 mm, and process a hole with a length of 200 mm and a width of 50 mm in the middle of the length and width surface of the aluminum block, to obtain an aluminum frame, which is cleaned and dried as a metal frame 2.

[0048] (2) Provide a graphite-aluminum heat-conducting block 1 with a length of 200 mm, a width of 50 mm, and a thickness of 20 mm, and process bonding teeth 3 with a depth of about 5 mm and a width of 1 mm on the contact surface of the graphite-aluminum heat-conducting block 1 and the aluminum frame, and clean and dry it.

[0049] (3) Put the aluminum frame prepared in step (2) into a special casting mold, and put the graphite-aluminum heat-conducting block 1 prepared in step (2) in the middle of the aluminum frame.

[0050] (4) Bonding:

[0051] Conventional processing mode, specific parameters: vacuum degree 1 x 10 -2 MPa, pressure 20 MPa, temperature 715°C, holding time 90 min, to obtain a graphite-aluminum-metal composite heat-conducting block, and the bonding teeth-bonding groove are well bonded.

[0052] After testing, the good product rate of the products of Example 1 and Example 2 can reach 80%.

[0053] The scanning electron microscope photograph of the graphite-aluminum heat-conducting block in this example is shown in Figure 3 , wherein the dark area is the graphite area, and the graphite area can be seen to be in a long strip shape, and each graphite area is generally in a single orientation, that is, in the transverse direction as shown in Figure 3 , and the light-colored area is the aluminum matrix.

[0054] Comparative Example

[0055] The comparative example is basically the same as Example 2, except that the graphite-aluminum heat-conducting block 1 is not provided with bonding teeth, and the specific steps are as follows:

[0056] (1) Provide 1060 aluminum block with length of 250mm, width of 50mm and thickness of 20mm, process a hole with size of 200mm*50mm in the middle of the aluminum block, clean and dry the aluminum frame after the hole is processed, and use the aluminum frame as the metal frame 2.

[0057] (2) Provide graphite-aluminum composite heat-conducting block 1 with length of 200mm, width of 50mm and thickness of 20mm, and clean and dry the graphite-aluminum composite heat-conducting block 1.

[0058] (3) Put the aluminum frame prepared in step (2) into a special casting mold, and put the graphite-aluminum heat-conducting block 1 prepared in step (2) into the middle of the aluminum frame.

[0059] (4) Bonding: under the condition of vacuum degree of 1*10 -2 MPa, pressure of 20MPa, temperature of 715°C and holding time of 90min, the graphite-aluminum-metal composite heat-conducting block is obtained, the bonding is poor, and the yield is about 20%.

[0060] The above content is only used to explain the technical thought of the present application, and cannot be used to limit the protection scope of the present application. Any modification made on the basis of the technical thought of the present application falls into the protection scope of the present application.

Claims

1. A graphite aluminum-metal composite heat conducting block, characterized by, The graphite-aluminum heat-conducting block (1) and the metal frame (2) are provided, the metal frame (2) has at least two opposite openings, and the graphite-aluminum heat-conducting block (1) is embedded in the metal frame (2); The graphite-aluminum heat-conducting block (1) is provided with a combination tooth (3) on the outer surface, and the metal frame (2) is provided with a combination groove at the position corresponding to the combination tooth (3) on the inner surface; the graphite-aluminum heat-conducting block (1) and the metal frame (2) are rigidly connected through the combination tooth (3) and the combination groove.

2. The graphite aluminum-metal composite heat block of claim 1, wherein, The combination tooth (3) is selected from one or more of sawtooth shape, circular shape, trapezoidal shape, rectangular shape and semicylindrical shape.

3. The graphite aluminum-metal composite heat block of claim 1, wherein, The graphite-aluminum heat-conducting block (1) contains a graphite region and an aluminum matrix, the graphite region is in an elongated shape and is arranged in a direction in the aluminum matrix.

4. The graphite aluminum-metal composite heat block of claim 3, wherein, The combination tooth (3) is arranged on at least the surface of the aluminum matrix in the graphite-aluminum heat-conducting block (1).

5. The graphite aluminum-metal composite heat block of claim 3, wherein, The graphite region and the aluminum matrix are rigidly connected.

6. The graphite aluminum-metal composite heat block of claim 3, wherein, The aluminum matrix is an aluminum single-element matrix or an aluminum alloy matrix.

7. The graphite aluminum-metal composite heat block according to any one of claims 1 to 6, wherein The surface of the graphite-aluminum heat-conducting block (1) contains the graphite region and the aluminum matrix region, and the surface area of the graphite region accounts for 40-50% in terms of area percentage.

8. The graphite aluminum-metal composite heat block of claim 1, wherein, The metal frame (2) is an aluminum frame or an aluminum alloy frame.

9. The graphite aluminum-metal composite heat conducting block according to claim 1, wherein, The length is 200-250 mm.

10. A graphite aluminum-metal composite heat conducting sheet, characterized by, A sheet cut from the graphite-aluminum metal composite heat-conducting block according to any one of claims 1-9.

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