A nano heat sink

Abstract

The present invention discloses a nano heat sink, belonging to the technical field of heat dissipation. The nano heat sink includes a fixed substrate, on which a number of heat dissipation fins are fixed. Each side of the heat dissipation fin is provided with a number of grooves, which are arranged in parallel. The distance between two grooves is 2-3 mm. A resin layer is coated inside each groove, and a uniformly dispersed nano heat dissipation layer is adhered to the resin layer. In the present invention, on the basis of the large surface area of the aluminum material, the heat contact area is further expanded, thereby effectively enhancing the heat conduction efficiency and improving the overall heat dissipation performance. At the same time, the nano material prepared by coprecipitation is light in weight, and the weight of the overall heat sink is not increased, making it easy to use.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat dissipation, and particularly relates to a nano heat sink. Background Art

[0002] With the development of the computer technology industry, the radiators currently used to provide heat dissipation for various electronic heating components inside the computer have evolved into various different forms. The reason is that in addition to considering their heat dissipation efficiency, radiators should especially consider factors such as production cost, the volume occupied by the radiator, weight, or the occasions to which they are applicable; therefore, different forms of radiators have emerged accordingly.

[0003] The magnitude of the thermal conductivity indicates the magnitude of the heat conduction ability of a substance. The larger the thermal conductivity, the correspondingly lower the thermal resistance value, and the stronger the heat conduction ability. Among metal materials, silver has the highest thermal conductivity, but the cost is high; pure copper is second, but it is not easy to process. However, with the increasing demand for heat dissipation, many people are constantly exploring and selecting new materials with the best thermal conductivity to meet the general trend of product design of high power and small volume for electronic devices. Currently, the classification of thermal conductive materials is mainly divided into: metal thermal conductive materials and non-metal thermal conductive materials.

[0004] Among the metal thermal conductivities, gold and silver belong to the materials with the best thermal conductivity, but the disadvantage is that their prices are too high, and it is not very realistic to be widely used. The heat dissipation effect of pure copper is second, but it is already very excellent. However, copper sheets also have their own disadvantages: high cost, large weight, poor corrosion resistance, poor plasticity, etc. In addition, the oxidizability of copper is the biggest drawback of copper itself. Once copper appears in an oxidized state, the heat conduction and heat dissipation will both drop significantly. Therefore, most current heat sinks are made of lightweight and strong aluminum materials. Among them, aluminum alloy has the best thermal conductivity, so now we can see that good CPU air-cooled radiators are generally made of aluminum alloy. Summary of the Invention

[0005] The purpose of the present invention is to provide a nano heat sink. In the present invention, on the basis of the large surface area of the aluminum material, the heat contact area is further expanded, thereby effectively enhancing the heat conduction efficiency and further improving the overall heat dissipation performance; at the same time, the nano material prepared by coprecipitation is light in weight, and the weight of the overall heat sink is not increased, making it easy to use.

[0006] To achieve the above object, the present invention provides the following technical solution: a nano heat sink, including a fixed substrate, on which a plurality of heat dissipation fins are fixed. Each heat dissipation fin is provided with a plurality of grooves on its side. The grooves are arranged in parallel, and the distance between two grooves is 2 - 3 mm. A resin layer is coated inside each groove, and a uniformly dispersed nano heat dissipation layer is adhered to the resin layer.

[0007] As a preferred solution of the present invention, the nano heat dissipation layer is composed of a plurality of aluminum ferrite nano particles.

[0008] As a preferred embodiment of the present invention, the aluminum ferrite nanoparticles are in the form of clusters in microscopic state, and each cluster is composed of a number of aluminum ferrite nanospheres.

[0009] The present invention utilizes aluminum ferrite nanomaterials to enhance the heat dissipation performance of heat sink fins. Since the aluminum ferrite used is a clustered sphere, which is formed by a number of smaller unit spheres, there are a number of gaps inside it, so that the overall specific surface area is increased, and then the heat contact area is further expanded on the basis of the large surface area of ​​the aluminum material, thereby effectively enhancing the heat conduction efficiency and improving the overall heat dissipation performance; at the same time, the nanomaterials made by co-precipitation are light in weight, the weight of the overall heat sink is not increased, and it is light to use.

[0010] As a preferred solution of the present invention, the resin layer is epoxy resin compounded with polyvinyl alcohol.

[0011] As a preferred embodiment of the present invention, the preparation of the clusters comprises the following steps:

[0012] Measure ethylene glycol solution and place it inside a beaker;

[0013] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the beaker, and stir the mixed solution magnetically for 60-80 minutes to obtain a uniform mixed solution;

[0014] Add PVP to the above mixed solution, heat to 60-70°C, and continue stirring for 60-80 minutes until PVP is completely dissolved;

[0015] Continue to add urea to the mixed solution in step ③ and continue stirring for 60-80 minutes to obtain a mixed solution A;

[0016] The mixed solution A is transferred to a stainless steel reactor with a polytetrafluoroethylene liner, and is kept in an electrically heated forced air drying oven at 180-200° C. for 20-24 hours to obtain a solid-liquid mixture B;

[0017] The precipitate in the solid-liquid mixture B is collected by a permanent magnet, and the precipitate is rinsed 3-5 times with deionized water to obtain a water-containing sample;

[0018] The aqueous sample was dried in a vacuum oven at 60°C for 24 hours to obtain aluminum ferrite clusters.

[0019] As a preferred embodiment of the present invention, the molar ratio of aluminum acetate to ferric chloride hexahydrate is 1:2.

[0020] As a preferred embodiment of the present invention, the addition amount of PVP is 4.0 - 6.0 g, and the molar ratio of PVP to ferric chloride hexahydrate is 1:1.

[0021] As a preferred embodiment of the present invention, the addition amount of urea is 6.0 - 8.0 g.

[0022] As a preferred embodiment of the present invention, the addition amount of ethylene glycol is 40 - 50 ml.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention uses aluminum ferrite nanomaterials to enhance the heat dissipation performance of the heat dissipation fins. Since the aluminum ferrite used is in the form of cluster-like spheres, which are composed of several smaller spheres clustering together, there are several gaps inside, thus increasing the overall specific surface area. Furthermore, on the basis of the large surface area of the aluminum material, the heat contact area is further expanded, thereby effectively enhancing the heat conduction efficiency and improving the overall heat dissipation performance. At the same time, the nanomaterials prepared by coprecipitation are light in weight, and the weight of the overall heat sink is not increased, making it easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the nano heat sink provided by the present invention.

[0026] In the figure: 1, fixed substrate; 2, heat dissipation fin; 3, groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to further understand the content, features and effects of the present invention, the following embodiments are cited and described in detail in conjunction with the accompanying drawings.

[0028] Please refer to Figure 1 , and the nano heat sink of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] As Figure 1 shown, the nano heat sink includes a fixed substrate 1, on which a plurality of heat dissipation fins 2 are fixed. Each heat dissipation fin 2 is provided with a plurality of grooves 3 on its side. The grooves 3 are arranged in parallel, and the distance between two grooves 3 is 2 - 3 mm. A resin layer is coated inside each groove 3, and a uniformly dispersed nano heat dissipation layer is adhered to the resin layer.

[0030] The nano heat dissipation layer is composed of a plurality of aluminum ferrite nanoparticles.

[0031] The microscopic state of the aluminum ferrite nanoparticles is cluster-like aluminum ferrite nanoparticles, and each cluster is composed of several aluminum ferrite nanospheres.

[0032] The resin layer is an epoxy resin compounded with polyvinyl alcohol.

[0033] The preparation of the cluster includes the following steps:

[0034] Measure the ethylene glycol solution and place it inside a beaker;

[0035] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the above beaker. Magnetically stir the mixed solution for 60 - 80 min to obtain a homogeneous mixed solution;

[0036] Add PVP to the above mixed solution, heat it to 60 - 70 °C, and continuously stir for 60 - 80 min until the PVP is completely dissolved;

[0037] Continue to add urea to the mixed solution in step ③, continuously stir for 60 - 80 min to obtain a mixed solution A;

[0038] Transfer the mixed solution A to a stainless - steel reactor with a polytetrafluoroethylene lining and keep it in an electric - heating blast drying oven at 180 - 200 °C for 20 - 24 h to obtain a solid - liquid mixture B;

[0039] Use a permanent magnet to collect the precipitate inside the solid - liquid mixture B, rinse the precipitate 3 - 5 times with deionized water, and collect the water - containing sample;

[0040] Dry the water - containing sample in a vacuum oven at 60 °C for 24 hours to obtain aluminum ferrite clusters.

[0041] Among them, the molar ratio of aluminum acetate to ferric chloride hexahydrate is 1:2.

[0042] The addition amount of PVP is 4.0 - 6.0 g, and the molar ratio of PVP to ferric chloride hexahydrate is 1:1.

[0043] The addition amount of urea is 6.0 - 8.0 g.

[0044] The addition amount of ethylene glycol is 40 - 50 ml.

[0045] Example 1

[0046] Weigh 1.08 g of ferric chloride hexahydrate and 0.49 g of aluminum acetate, add 4.0 g of PVP, the addition amount of ethylene glycol is 40 ml, and the addition amount of urea is 6.0 g.

[0047] Specifically, it includes the following steps:

[0048] Measure the ethylene glycol solution and place it inside a beaker;

[0049] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the above beaker. Magnetically stir the mixed solution for 60 min to obtain a homogeneous mixed solution;

[0050] Add PVP to the above mixed solution, heat it to 60 °C, and continuously stir for 60 min until the PVP is completely dissolved;

[0051] Continue to add urea to the mixed solution in step ③, and continuously stir for 60 min to obtain mixed solution A;

[0052] Transfer mixed solution A to a stainless-steel reactor with a polytetrafluoroethylene lining, and keep it in an electric heating blast drying oven at 180 °C for 24 h to obtain a solid-liquid mixture B;

[0053] Use a permanent magnet to collect the precipitate inside the solid-liquid mixture B, rinse the precipitate 3 times with deionized water, and collect the water-containing sample;

[0054] Dry the water-containing sample in a vacuum oven at 60 °C for 24 hours to obtain aluminum ferrite clusters.

[0055] Example 2

[0056] Weigh 1.08 g of ferric chloride hexahydrate and 0.49 g of aluminum acetate, add 5.0 g of PVP, the addition amount of ethylene glycol is 40 ml, and the addition amount of urea is 7.20 g.

[0057] Specifically, it includes the following steps:

[0058] Measure the ethylene glycol solution and place it inside a beaker;

[0059] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the above beaker, and magnetically stir the mixed solution for 60 min to obtain a uniform mixed solution;

[0060] Add PVP to the above mixed solution, heat it to 60 °C, and continuously stir for 60 min until the PVP is completely dissolved;

[0061] Continue to add urea to the mixed solution in step ③, and continuously stir for 60 min to obtain mixed solution A;

[0062] Transfer mixed solution A to a stainless-steel reactor with a polytetrafluoroethylene lining, and keep it in an electric heating blast drying oven at 180 °C for 24 h to obtain a solid-liquid mixture B;

[0063] Use a permanent magnet to collect the precipitate inside the solid-liquid mixture B, rinse the precipitate 3 times with deionized water, and collect the water-containing sample;

[0064] Dry the water-containing sample in a vacuum oven at 60 °C for 24 hours to obtain aluminum ferrite clusters.

[0065] Example 3

[0066] Weigh 1.08 g of ferric chloride hexahydrate and 0.49 g of aluminum acetate. Add 6.0 g of PVP and 40 ml of ethylene glycol. The amount of urea added is 8.0 g.

[0067] Specifically, it includes the following steps:

[0068] Measure the ethylene glycol solution and place it inside a beaker;

[0069] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the above beaker. Magnetically stir the mixed solution for 60 min to obtain a homogeneous mixed solution;

[0070] Add PVP to the above mixed solution, heat it to 60 °C, and continuously stir for 60 min until the PVP is completely dissolved;

[0071] Continue to add urea to the mixed solution in step ③ and continuously stir for 60 min to obtain mixed solution A;

[0072] Transfer mixed solution A to a stainless-steel reactor with a polytetrafluoroethylene lining and keep it in an electric heating blast drying oven at 180 °C for 24 h to obtain a solid-liquid mixture B;

[0073] Use a permanent magnet to collect the precipitate inside the solid-liquid mixture B, rinse the precipitate 3 times with deionized water, and collect the water-containing sample;

[0074] Dry the water-containing sample in a vacuum oven at 60 °C for 24 hours to obtain aluminum ferrite clusters.

[0075] Example 4

[0076] Weigh 1.08 g of ferric chloride hexahydrate and 0.49 g of aluminum acetate. Add 4.0 g of PVP and 40 ml of ethylene glycol. The amount of urea added is 7.2 g.

[0077] Specifically, it includes the following steps:

[0078] Measure the ethylene glycol solution and place it inside a beaker;

[0079] Weigh ferric chloride hexahydrate and aluminum acetate and add them to the above beaker. Magnetically stir the mixed solution for 60 min to obtain a homogeneous mixed solution;

[0080] Add PVP to the above mixed solution, heat it to 60 °C, and continuously stir for 60 min until the PVP is completely dissolved;

[0081] Continue to add urea to the mixed solution in step ③ and continuously stir for 60 min to obtain mixed solution A;

[0082] Transfer the mixed solution A into a stainless-steel reactor with a polytetrafluoroethylene lining, and keep it in an electric heating forced-air drying oven at 180 °C for 24 h to obtain a solid-liquid mixture B;

[0083] Use a permanent magnet to collect the precipitate inside the solid-liquid mixture B, rinse the precipitate 3 times with deionized water, and collect the water-containing sample;

[0084] Dry the water-containing sample in a vacuum oven at 60 °C for 24 hours to obtain aluminum ferrite clusters.

[0085] When preparing the heat sink, process grooves on the above-mentioned heat dissipation fins. The depth of the grooves is 2 mm, the groove spacing is 3 mm, and a 1-mm epoxy resin compounded with polyvinyl alcohol is evenly coated on the bottom of the grooves. Then, coat the aluminum ferrite clusters prepared in each of the above embodiments on the resin layer, and dry it to obtain the finished product. The fixed substrate and the heat dissipation fins are both made of aluminum.

[0086] The aluminum ferrite clusters prepared according to different embodiments are sequentially labeled as heat sinks 1-4.

[0087] Comparative example

[0088] Adopt an existing conventional aluminum power radiator.

[0089] Adopt four 220V conventional power supplies, and sequentially replace the radiators inside them with heat sinks 1-4.

[0090] Measure the temperature on the surface of the above-mentioned conventional power supply, and at the same time measure the surface temperature of the power supply using the radiator. Start measuring 30 minutes after the power supply is powered on. The surface temperatures of the power supply are 35 °C, 39 °C, 42 °C, 38 °C, and 51 °C in sequence. Therefore, the heat dissipation effect of using the radiator in this embodiment is significantly better than that of the conventional radiator, and the coating with the nanomaterial prepared in Example 1 is the best.

[0091] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nano heat sink, characterized in that: The invention comprises a fixed substrate, on which a plurality of heat dissipation fins are fixed, a plurality of grooves are arranged on the side of each heat dissipation fin, the grooves are arranged in parallel, the spacing between two grooves is 2-3mm, a resin layer is coated inside each groove, a uniformly dispersed nano heat dissipation layer is bonded on the resin layer, the nano heat dissipation layer is composed of a plurality of aluminum ferrite nanoparticles, the aluminum ferrite nanoparticles are in the form of clusters in microscopic state, and each cluster is composed of a plurality of aluminum ferrite nanospheres.

2. The nano heat sink according to claim 1, characterized in that: The resin layer is epoxy resin compounded with polyvinyl alcohol.

3. The nano heat sink according to claim 1, characterized in that: The preparation of the cluster body comprises the following steps: Measure ethylene glycol solution and place it inside a beaker; Weigh ferric chloride hexahydrate and aluminum acetate and add them to the beaker, and stir the mixed solution magnetically for 60-80 minutes to obtain a uniform mixed solution; Add PVP to the above mixed solution, heat to 60-70°C, and continue stirring for 60-80 minutes until PVP is completely dissolved; Continue to add urea to the mixed solution in step ③ and continue stirring for 60-80 minutes to obtain a mixed solution A; The mixed solution A is transferred to a stainless steel reactor with a polytetrafluoroethylene liner, and is kept in an electrically heated forced air drying oven at 180-200° C. for 20-24 hours to obtain a solid-liquid mixture B; The precipitate in the solid-liquid mixture B is collected by a permanent magnet, and the precipitate is rinsed 3-5 times with deionized water to obtain a water-containing sample; The aqueous sample was dried in a vacuum oven at 60°C for 24 hours to obtain aluminum ferrite clusters.

4. A nano heat sink according to claim 3, characterized in that: The molar ratio of the aluminum acetate to ferric chloride hexahydrate is 1:

2.

5. The nano heat sink according to claim 3, characterized in that: The amount of PVP added is 4.0-6.0 g, and the molar ratio of PVP to ferric chloride hexahydrate is 1:

1.

6. The nano heat sink according to claim 3, characterized in that: The amount of urea added is 6.0-8.0 g.

7. The nano heat sink according to claim 3, characterized in that: The amount of ethylene glycol added is 40-50 ml.

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