Radiating plate and preparation method thereof

Abstract

The present invention relates to the technical field of heat sinks, and specifically provides a heat sink and a preparation method thereof. The preparation method specifically comprises: grinding copper plates and aluminum plates to remove oil stains, impurities and oxide layers on the surfaces of the copper and aluminum plates to obtain treated copper plates and aluminum plates; placing the treated aluminum plates on a platform, and evenly arranging a plurality of support frames, placing the treated copper plates on the support frames, and laying low-speed explosives for explosive compounding to obtain a copper-aluminum composite plate; cutting the copper-aluminum composite plate, and then hot-extruding the aluminum end of the copper-aluminum composite plate to obtain a heat sink. The explosively compounded copper-aluminum composite plates are tightly combined, and the heat conduction speed is fast, wherein the heat sinks are distributed in a radial manner from the inside to the outside, so as to achieve the effect of rapid heat dissipation.

Description

Technical Field

[0001] The present invention relates to the technical field of heat sinks, and in particular provides a heat sink and a preparation method thereof. Background Art

[0002] During the use of electrical equipment, its temperature will increase with the increase of operating time, which will lead to a series of problems such as increased thermal stress of materials and accelerated aging of components, greatly reducing the service life of electrical equipment. Therefore, heat sinks are widely used in various electrical equipment. In the prior art, the heat sink and the substrate in the heat sink are generally fixedly connected by welding, and also include fixing by sintering and connecting with thermal conductive adhesive. However, the above preparation method has a cumbersome preparation process, and the obtained heat sink has a low thermal conductivity coefficient, resulting in a technical problem of low heat exchange efficiency. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention uses copper plate and aluminum plate to obtain a copper-aluminum composite plate by explosive compounding, and then obtains a heat sink by hot extrusion of the aluminum end, thereby obtaining a heat sink with light weight and high thermal conductivity coefficient and the heat sink fins are radially distributed from the inside to the outside.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides a method for preparing a heat sink, and the preparation method specifically comprises:

[0005] Grinding the copper plate and the aluminum plate to remove oil stains, impurities and oxide layers on the surface of the copper plate and the aluminum plate to obtain treated copper plate and aluminum plate;

[0006] Placing the treated aluminum plate on a platform and evenly arranging a plurality of support frames, placing the treated copper plate on the support frame, and laying low-speed explosives for explosive compounding to obtain a copper-aluminum composite plate;

[0007] After the copper-aluminum composite plate is cut, the aluminum end of the copper-aluminum composite plate is hot-extruded to obtain a heat dissipation plate.

[0008] Furthermore, the thickness of the aluminum plate is 10-15 mm, and the thickness of the copper plate is 30-40 mm.

[0009] Furthermore, the height of the support frame is 5-9 mm.

[0010] Furthermore, the low-speed explosive is expanded ammonium nitrate, No. 2 rock ammonium nitrate explosive, 94.5% porous ammonium nitrate and 5.5% diesel, powdered emulsion explosive and salt or TNT explosive, the amount of the explosive is 2-5g / cm3, and the detonation speed is 2000-3000m / s.

[0011] Furthermore, the temperature of the hot extrusion molding process is 450-500°C.

[0012] Based on the same inventive concept, an embodiment of the present invention further provides a heat sink, which is prepared by the above preparation method;

[0013] The heat sink comprises a heat sink bottom plate and heat sink fins;

[0014] The heat dissipation bottom plate is a copper plate, and the heat dissipation fins are aluminum plates; the heat dissipation fins are radially arranged and distributed radiating from the inside to the outside; the heat dissipation bottom plate and the heat dissipation fins are fixedly connected.

[0015] Furthermore, the height of the heat sink is 60-100 mm, and the thickness of the heat sink is 2-6 mm.

[0016] Furthermore, the heat sink is distributed radially from the inside to the outside:

[0017] The heat sinks are divided into 4 to 8 groups, each group is on a circular arc with the same radius, and the number of heat sinks in each group increases gradually from the inside to the outside.

[0018] Beneficial effects:

[0019] (1) The present invention uses a copper plate and an aluminum plate to obtain a copper-aluminum composite plate by explosive compounding, and then obtains a corresponding aluminum heat sink by hot extrusion of the aluminum end. The copper-aluminum composite plate obtained by explosive compounding is tightly combined, and the heat conduction speed is fast. The heat sink is radially arranged and radially distributed from the inside to the outside, and the number gradually increases from the inside to the outside, so that the heat dissipation rate of the outside is fast, and the heat on the inside is easily transferred to the outside, thereby achieving rapid heat dissipation.

[0020] (2) The heat sink preparation method of the present invention obtains a copper-aluminum composite plate through an explosive composite process, and then a heat sink of any shape can be obtained by shearing to adapt to different application environments. In addition, a heat sink that diffuses from the inside to the outside is formed by hot extrusion through a mold. The molding is one-step and the preparation process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a heat sink provided in an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the distribution of heat sink fins of a circular heat sink provided in an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the distribution of heat sink fins of a square heat sink provided in an embodiment of the present invention.

[0024] [Description of Reference Numerals]

[0025] 1. Heat sink; 2. Heat dissipation base plate. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, they will be described in detail below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0027] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0028] Unless otherwise specified, various raw materials, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0029] In an embodiment of the present invention, a method for preparing a heat sink comprises the following steps:

[0030] The copper plate and the aluminum plate are polished to remove the oil, impurities and oxide layer on the surface of the copper and aluminum plates to obtain the treated copper plate and the aluminum plate; the treated aluminum plate is placed on the platform, and a plurality of copper support frames are evenly arranged, the treated copper plate is placed on the support frame, and low-speed explosives are laid. The low-speed explosives are expanded ammonium nitrate, No. 2 rock ammonium nitrate explosives, 94.5% porous ammonium nitrate and 5.5% diesel, powdered emulsion explosives and salt or TNT explosives, and the laying amount of explosives is 2-5g / cm 3 , detonate from the middle of the explosive, and perform explosion compounding at a detonation speed of 2000-3000m / s to obtain a copper-aluminum composite plate; cut the copper-aluminum composite plate into the required heat dissipation plate shape, such as round, square or other special shapes to meet the heat dissipation requirements of different electrical equipment, and extrude the aluminum end of the cut copper-aluminum composite plate at a temperature of 450-500°C to obtain Figure 1-3 The heat sink shown in the figure comprises a heat sink base plate 2 and a heat sink 1; the heat sink base plate is a copper plate with a thickness of 30-40 mm, the heat sink 1 is an aluminum plate, the heat sink 1 is radially arranged and radiated from the inside to the outside, the heat sink is divided into 4-8 groups, each group is on an arc of the same radius, the number of heat sinks in each group increases gradually from the inside to the outside, the height of the heat sink 1 is 60-100 mm, and the thickness of the heat sink is 2-6 mm.

[0031] The invention is further described below with reference to specific examples.

[0032] Example 1

[0033] The present embodiment provides a circular heat sink, which is composed of a heat sink bottom plate 2 and a heat sink 1. First, a 30 mm copper plate and a 13 mm aluminum plate are polished to remove oil stains, impurities and oxide layers on the surface of the copper and aluminum plates to obtain the treated copper and aluminum plates. The treated aluminum plates are placed on a platform, and a plurality of 8 mm high copper support frames are evenly arranged. The treated copper plates are placed on the support frames, and low-speed explosives are laid: expanded ammonium nitrate, No. 2 rock ammonium nitrate explosive, 94.5% porous ammonium nitrate and 5.5% diesel, powdered emulsion explosives and salt or TNT explosives, and the amount of explosives laid is 4 g / cm 3 The explosive is detonated from the middle of the explosive, and the explosion is performed at a detonation speed of 2200 m / s to obtain a copper-aluminum explosion composite plate. The copper-aluminum explosion composite plate is cut into a circular plate, and the aluminum end of the copper-aluminum explosion composite plate is extruded into a circular die at a temperature of 480°C. Figure 2 The heat sinks are arranged as shown to obtain a circular heat sink.

[0034] Example 2

[0035] The present embodiment provides a square heat sink, which is composed of a heat sink bottom plate 2 and a heat sink 1. First, a 35 mm copper plate and a 14 mm aluminum plate are polished to remove oil stains, impurities and oxide layers on the surface of the copper and aluminum plates to obtain the treated copper and aluminum plates. The treated aluminum plates are placed on a platform, and a plurality of 7 mm high copper support frames are evenly arranged. The treated copper plates are placed on the support frames, and low-speed explosives are laid: expanded ammonium nitrate, No. 2 rock ammonium nitrate explosive, 94.5% porous ammonium nitrate and 5.5% diesel, powdered emulsion explosives and salt or TNT explosives, and the amount of explosives laid is 2 g / cm 3 The explosive is detonated from the middle of the explosive, and the explosion is performed under the condition of a detonation velocity of 2200m / s to obtain a copper-aluminum explosion composite plate, the copper-aluminum explosion composite plate is cut into square plates, and the aluminum end of the copper-aluminum explosion composite plate is extruded into the following shapes using a square die at a temperature of 500°C: Figure 3 Heat sinks arranged as shown.

[0036] The embodiments described above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a heat dissipation plate, characterized in that: The preparation method specifically comprises: Grinding the copper plate and the aluminum plate to remove oil stains, impurities and oxide layers on the surface of the copper plate and the aluminum plate to obtain treated copper plate and aluminum plate; Placing the treated aluminum plate on a platform and evenly arranging a plurality of support frames, placing the treated copper plate on the support frame, and laying low-speed explosives for explosive compounding to obtain a copper-aluminum composite plate; After cutting the copper-aluminum composite plate, hot extrusion is performed on the aluminum end of the copper-aluminum composite plate to obtain a heat dissipation plate; The heat sink comprises a heat sink bottom plate and heat sink fins; The heat dissipation base plate is a copper plate, and the heat sink is an aluminum plate; the heat sink is radially arranged and radiated from the inside to the outside; the heat dissipation base plate and the heat sink are fixedly connected; the heat sink is divided into 4-8 groups, each group is on the same radius arc, and the number of heat sinks in each group gradually increases from the inside to the outside.

2. The method for preparing a heat dissipation plate according to claim 1, characterized in that: The thickness of the aluminum plate is 10-15 mm, and the thickness of the copper plate is 30-40 mm.

3. The method for preparing a heat dissipation plate according to claim 1, characterized in that: The height of the support frame shown is 5-9 mm.

4. The method for preparing a heat dissipation plate according to claim 1, characterized in that: The low-speed explosives are expanded ammonium nitrate, No. 2 rock ammonium nitrate explosive, 94.5% porous ammonium nitrate and 5.5% diesel, powdered emulsion explosive and salt or TNT explosive, and the amount of the explosives is 2-5g / cm 3 , the explosion speed is 2000-3000m / s.

5. The method for preparing a heat dissipation plate according to claim 1, characterized in that: The temperature of the hot extrusion molding process is 450-500°C.

6. A heat sink, characterized in that: The heat sink is prepared by the preparation method according to any one of claims 1 to 5.

7. The heat sink according to claim 6, characterized in that: The height of the heat sink is 60-100 mm, and the thickness of the heat sink is 2-6 mm.

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