Aluminum-based refrigeration fin and preparation method thereof

Abstract

The application discloses an aluminum-based refrigeration cooling fin and a preparation method thereof. The preparation method comprises the following steps: preparing a precursor solution containing zinc acetate; coating the precursor solution on the surface of an aluminum base; and performing high-temperature treatment on the aluminum base coated with the precursor solution to obtain the aluminum-based refrigeration cooling fin. The temperature of the high-temperature treatment is 350-390 DEG C, and the time of the high-temperature treatment is 30-40 min. By the preparation method, the aluminum originally having a porous structure is selected as the base, the precursor solution can be converted into zinc oxide material, the zinc oxide material can be attached to the nanoporous surface of the aluminum base, the heat conduction and radiation amount are enhanced, the heat energy is accelerated to diffuse, and the aluminum-based refrigeration cooling fin has higher heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to the field of biomimetic radiation cooling technology, and in particular to an aluminum-based cooling heat sink and its preparation method. Background Technology

[0002] A heat sink is a device used to dissipate heat from electronic components in electrical appliances that are prone to overheating. They are mostly made of aluminum alloy, brass, or bronze and can be in the form of plates, sheets, or multiple sheets. For example, the CPU in a computer requires a fairly large heat sink, and the power transistors, horizontal output transistors, and power amplifier transistors in a television all require heat sinks.

[0003] Traditional heat sinks require a layer of thermal grease to be applied to the contact surface between the electronic component and the heat sink during use. This allows the heat generated by the electronic component to be more effectively conducted to the heat sink, and then dissipated into the surrounding air by the heat sink.

[0004] Traditional heat sinks vary in heat dissipation performance depending on their material. Aluminum heat sinks are one of the most widely used heat sinks, as they are low in cost and capacity. However, due to limitations in manufacturing processes, the spacing between these heat sinks can generally only be 1.1mm, resulting in poor heat dissipation.

[0005] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention provides an aluminum-based cooling heat sink and its preparation method, thereby solving the problem of low heat dissipation efficiency of traditional heat sinks.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0008] In a first aspect, the present invention provides a method for preparing an aluminum-based cooling heat sink, the method comprising the following steps:

[0009] A precursor solution is prepared, wherein the precursor solution contains zinc acetate;

[0010] The precursor solution is coated onto the surface of an aluminum substrate, and the aluminum substrate coated with the precursor solution is subjected to high-temperature treatment to obtain the aluminum-based cooling heat sink.

[0011] The high-temperature treatment is performed at a temperature of 350-390℃ for 30-40 minutes.

[0012] Preferably, the precursor solution comprises zinc acetate, ethylene glycol methyl ether, and a stabilizer.

[0013] Preferably, in the precursor solution, the mass ratio of zinc acetate, ethylene glycol methyl ether, and stabilizer is (25-35):(90-110):(4-6).

[0014] Preferably, the preparation of the precursor solution specifically involves:

[0015] Add the stabilizer to ethylene glycol methyl ether and stir for 10-15 minutes to obtain a mixed solution;

[0016] Add zinc acetate to the mixed solution and stir for 30-40 minutes to obtain the precursor solution.

[0017] Preferably, the precursor solution is coated onto the surface of an aluminum substrate, specifically as follows:

[0018] The precursor solution is spin-coated onto the surface of an aluminum substrate, and then the aluminum substrate with the precursor solution spin-coated is heated and dried.

[0019] Preferably, the spin coating speed is 1800-2400 r / min and the spin coating time is 30 s;

[0020] The heating temperature is 80-90℃, and the time is 5-10 minutes.

[0021] Preferably, the aluminum substrate coated with the precursor solution is subjected to high-temperature treatment, specifically as follows:

[0022] An aluminum substrate coated with a precursor solution is placed in a muffle furnace for high-temperature treatment.

[0023] The heating rate is 5-10℃ / min, the heating time is 70-90min, the maximum temperature is 350-390℃, and the holding time of the maximum temperature is 30-40min.

[0024] Preferably, before coating the precursor solution onto the aluminum substrate surface, the method further includes the step of cleaning the aluminum substrate with anhydrous ethanol.

[0025] In a second aspect, the present invention provides an aluminum-based cooling heat sink prepared by the above-described preparation method.

[0026] Beneficial effects:

[0027] This invention discloses an aluminum-based cooling heat sink and its preparation method. The aluminum-based cooling heat sink provided by this invention has higher heat dissipation efficiency. Through the preparation method provided by this invention, and by selecting aluminum with a porous structure as the substrate, the precursor solution can be converted into zinc oxide material. The zinc oxide material can adhere to the nanoporous surface of the aluminum substrate, enhancing heat conduction and radiation, and realizing accelerated heat diffusion, thus enabling the aluminum-based cooling heat sink to have higher heat dissipation efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the preparation process of the aluminum-based cooling heat sink in an embodiment of the present invention;

[0029] Figure 2 The graph shows the test results of the heat dissipation performance of the aluminum-based cooling heat sinks prepared in Examples 1-3 of this invention;

[0030] Figure 3 The graph shows the results of multiple heat dissipation performance tests of the aluminum-based cooling heat sink prepared in Example 2 of the present invention.

[0031] Figure 4 The temperature drop rate of the aluminum-based cooling heat sink prepared in Examples 1-3 of this invention relative to the temperature of the original aluminum sheet;

[0032] Figure 5 Thermal imaging (50°C) of the heat dissipation performance test process of the aluminum-based cooling heat sinks prepared in Examples 1-3 of the present invention;

[0033] Figure 6 Thermal imaging (65°C) of the heat dissipation performance test process of the aluminum-based cooling heat sinks prepared in Examples 1-3 of the present invention;

[0034] Figure 7 The thermal imaging (80°C) shows the heat dissipation performance test process of the aluminum-based cooling heat sinks prepared in Examples 1-3 of this invention.

[0035] Figure 8 These are super-depth-of-field images of the original aluminum sheet and the aluminum-based cooling heat sink prepared according to the embodiments of the present invention.

[0036] Figure 9 The image shows the XRD pattern of the aluminum-based cooling heat sink prepared according to an embodiment of the present invention. Detailed Implementation

[0037] This invention provides an aluminum-based cooling heat sink and its preparation method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] To address the problem of low heat dissipation efficiency in existing heat sinks, this invention mimics the granular structure of insect bodies, selecting aluminum, which has a porous structure, as the substrate and using zinc oxide as the manufacturing material. This allows the zinc oxide material to adhere to the nanoporous surface, enhancing heat conduction and radiation, accelerating the diffusion of heat energy, and ultimately achieving a radiative cooling effect.

[0039] This invention provides a method for preparing an aluminum-based cooling heat sink, the method comprising the following steps:

[0040] A precursor solution is prepared, wherein the precursor solution contains zinc acetate;

[0041] The precursor solution is coated onto the surface of an aluminum substrate, and the aluminum substrate coated with the precursor solution is subjected to high-temperature treatment to obtain the aluminum-based cooling heat sink.

[0042] The high-temperature treatment is performed at a temperature of 350-390℃ for 30-40 minutes.

[0043] This invention converts zinc acetate into zinc oxide through thermal decomposition. The specific reaction equation is as follows:

[0044] 2Zn(CH3-COO)2→2ZnO+4CH3-COOH+O2;

[0045] At this point, the aluminum substrate surface is covered with a zinc oxide coating, giving it a grooved structure. The aluminum substrate itself is porous, and this porous structure has a larger surface area than a dense structure. This means more heat can be dissipated through surface conduction, convection, and radiation. By increasing the surface area, the porous structure improves the efficiency of heat exchange with the surrounding environment, thus enhancing heat dissipation performance. It also increases airflow; specifically, the pores in the porous structure provide more channels, allowing air to flow more easily through the material. Through these channels, heat can be conducted more quickly from the material's interior to the surface and carried away by airflow. This increased airflow helps accelerate heat conduction and dissipation, thereby improving heat dissipation.

[0046] In some embodiments, before coating the precursor solution onto the surface of the aluminum substrate, the method further includes the step of cutting the original aluminum substrate to size using scissors or a laser marking machine; the length and width of the aluminum substrate can be changed according to the heat dissipation size requirements, and the thickness is 0.2-0.4 mm.

[0047] If the flatness requirement of the heat sink (aluminum substrate) is not high, it can be cut to the required shape using scissors; if the flatness requirement of the heat sink (aluminum substrate) surface is high, laser marking is required for cutting, using a cyclic marking mode. The specific parameters for laser marking are as follows:

[0048] Marking speed: 200-300mm / s; Jump time: 300-350mm / s; Jump delay: 100-150μs; Inflection point delay: 00-150μs; Light-on delay: 100-150μs; Light-off delay: 500-600μs; Current: 50-60A; Laser frequency: 10-15kHz; Pulse width: 6-10μs; First pulse suppression width: 90-100μs.

[0049] In some embodiments, the precursor solution includes zinc acetate, ethylene glycol methyl ether, and a stabilizer.

[0050] In some embodiments, the mass ratio of zinc acetate, ethylene glycol methyl ether, and stabilizer in the precursor solution is (25-35):(90-110):(4-6).

[0051] In this embodiment of the invention, the ratio is controlled within the above range, which allows the precursor solution to exist stably at room temperature (15-35℃).

[0052] In some embodiments, the preparation of the precursor solution specifically involves:

[0053] Add the stabilizer to ethylene glycol methyl ether and stir for 10-15 minutes to obtain a mixed solution;

[0054] Add zinc acetate to the mixed solution and stir for 30-40 minutes to obtain the precursor solution.

[0055] In the preparation of the precursor solution, first weigh ethanolamine (stabilizer), add it to ethylene glycol methyl ether solvent, and stir magnetically for 10-15 minutes. Then weigh the appropriate proportion of zinc acetate, add it to the above solution, and then heat it in a water bath with magnetic stirring. The water bath temperature is 55-75℃, the stirring speed is 1000-1500 r / min, and the stirring time is 30-40 min.

[0056] The prepared solution needs to be left to stand at room temperature in a place without sunlight for more than 6 hours to allow its internal components to disperse evenly.

[0057] In some embodiments, the precursor solution is coated onto the surface of an aluminum substrate, specifically:

[0058] The precursor solution is spin-coated onto the surface of an aluminum substrate, and then the aluminum substrate with the precursor solution spin-coated is heated and dried.

[0059] In some embodiments, the spin coating speed is 1800-2400 r / min and the spin coating time is 30 s;

[0060] The heating temperature is 80-90℃, and the time is 5-10 minutes.

[0061] In some embodiments, the aluminum substrate coated with the precursor solution is subjected to high-temperature treatment, specifically:

[0062] An aluminum substrate coated with a precursor solution is placed in a muffle furnace for high-temperature treatment.

[0063] The heating rate is 5-10℃ / min, the heating time is 70-90min, the maximum temperature is 350-390℃, and the holding time of the maximum temperature is 30-40min.

[0064] At the aforementioned heating rate, fatigue and a decline in mechanical properties of the aluminum substrate due to thermal stress caused by excessively rapid temperature rise can be prevented, while excessively slow heating can lead to excessively long preparation times and reduced preparation efficiency. Maintaining the highest temperature for 30-40 minutes allows the precursor solution to fully react and generate ZnO particles.

[0065] In some embodiments, before coating the precursor solution onto the aluminum substrate surface, the step of cleaning the aluminum substrate with anhydrous ethanol is further included.

[0066] The cleaning process uses an ultrasonic cleaner and anhydrous ethanol as the cleaning solution. The cleaning time is 10-15 minutes. During the cleaning process, it is important to ensure that each sample is fully in contact with the cleaning solution to prevent them from sticking together due to suction.

[0067] After cleaning, the sample is dried using a forced-air drying oven. The cleaned sample is placed flat in the drying oven at a temperature of 60-80℃ for 10-15 minutes.

[0068] In a second aspect, the present invention provides an aluminum-based cooling heat sink prepared by the above-described preparation method.

[0069] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are intended only to illustrate the present invention and not to limit it. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0070] Preparation of the precursor solution: The precursor solution is a zinc acetate solution in ethylene glycol methyl ether, with ethanolamine selected as the stabilizer. To ensure the stability of the solution, the weight ratio of zinc acetate, ethylene glycol methyl ether, and ethanolamine is 35:110:6. This ratio allows the precursor solution to remain stable at room temperature (15-35℃). During the preparation of the precursor solution, first weigh the ethanolamine and add it to the ethylene glycol methyl ether solvent, stirring magnetically for 15 minutes. Then weigh the appropriate proportion of zinc acetate and add it to the above solution. Perform magnetic stirring in a water bath at 75℃, stirring speed of 1500 r / min, and stirring time of 40 min. The prepared solution should be placed at room temperature in a place without direct sunlight for at least 6 hours to allow for uniform dispersion of its internal components.

[0071] Example 1

[0072] Preparation of an aluminum-based cooling heat sink, see Figure 1 This includes the following steps:

[0073] The aluminum sheet is a special laser-marked aluminum sheet, with a length, width, and thickness of 0.3 mm.

[0074] The aluminum sheet is cut using laser marking, employing a cyclic marking mode. Specific laser marking parameters are as follows:

[0075] Marking speed: 300mm / s; Jump time: 350mm / s; Jump delay: 150μs; Inflection point delay: 00-150μs; Light-on delay: 150μs; Light-off delay: 600μs; Current: 60A; Laser frequency: 15kHz; Pulse width: 10μs; First pulse suppression width: 100μs.

[0076] The cut aluminum sheets are then cleaned using an ultrasonic cleaner with anhydrous ethanol as the cleaning solution. The cleaning time is 15 minutes. During cleaning, it is important to ensure that each aluminum sheet is fully in contact with the cleaning solution to prevent them from sticking together due to suction.

[0077] The cleaned aluminum sheets were dried using a forced-air drying oven. The cleaned samples were placed flat in the drying oven at 80°C for 15 minutes.

[0078] The prepared precursor solution was spin-coated onto the dried aluminum sheet at a spin speed of 2000 r / min to ensure that the precursor solution could be evenly coated on the surface of the aluminum sheet and to prevent excess precursor solution residue. After spin-coating once, the sheet was placed in a forced-air drying oven for preliminary heating and drying at a temperature of 90℃ for 10 min.

[0079] The aluminum sheet coated with the precursor solution was placed in a muffle furnace for high-temperature treatment to achieve the final shaping of the surface structure and complete the transformation of zinc acetate to zinc oxide. The heating rate was 10℃ / min, the heating time was 90min, and the maximum temperature was 390℃ to ensure the full transformation of surface components and the formation of structure. The maximum temperature was held for 40min to ensure the full volatilization of ethylene glycol methyl ether. After heating, the sheet was cooled with the furnace until it reached room temperature to obtain an aluminum-based cooling heat sink.

[0080] Example 2

[0081] The preparation of an aluminum-based cooling heat sink includes the following steps:

[0082] The aluminum sheet is a special laser-marked aluminum sheet, with a length, width, and thickness of 0.3 mm.

[0083] The aluminum sheet is cut using laser marking, employing a cyclic marking mode. Specific laser marking parameters are as follows:

[0084] Marking speed: 300mm / s; Jump time: 350mm / s; Jump delay: 150μs; Inflection point delay: 00-150μs; Light-on delay: 150μs; Light-off delay: 600μs; Current: 60A; Laser frequency: 15kHz; Pulse width: 10μs; First pulse suppression width: 100μs.

[0085] The cut aluminum sheets are then cleaned using an ultrasonic cleaner with anhydrous ethanol as the cleaning solution. The cleaning time is 15 minutes. During cleaning, it is important to ensure that each aluminum sheet is fully in contact with the cleaning solution to prevent them from sticking together due to suction.

[0086] The cleaned aluminum sheets were dried using a forced-air drying oven. The cleaned samples were placed flat in the drying oven at 80°C for 15 minutes.

[0087] The prepared precursor solution was spin-coated onto the dried aluminum sheet at a spin speed of 2000 r / min to ensure that the precursor solution could be evenly coated on the surface of the aluminum sheet and to prevent excess precursor solution residue. After spin-coating once, the sheet was placed in a forced-air drying oven for preliminary heating and drying at a temperature of 90℃ for 10 min. The spin-coating and drying process was repeated twice.

[0088] The aluminum sheet coated with the precursor solution was placed in a muffle furnace for high-temperature treatment to achieve the final shaping of the surface structure and complete the transformation of zinc acetate to zinc oxide. The heating rate was 10℃ / min, the heating time was 90min, and the maximum temperature was 390℃ to ensure the full transformation of surface components and the formation of structure. The maximum temperature was held for 40min to ensure the full volatilization of ethylene glycol methyl ether. After heating, the sheet was cooled with the furnace until it reached room temperature to obtain an aluminum-based cooling heat sink.

[0089] Example 3

[0090] The preparation of an aluminum-based cooling heat sink includes the following steps:

[0091] The aluminum sheet is a special laser-marked aluminum sheet, with a length, width, and thickness of 0.3 mm.

[0092] The aluminum sheet is cut using laser marking, employing a cyclic marking mode. Specific laser marking parameters are as follows:

[0093] Marking speed: 300mm / s; Jump time: 350mm / s; Jump delay: 150μs; Inflection point delay: 00-150μs; Light-on delay: 150μs; Light-off delay: 600μs; Current: 60A; Laser frequency: 15kHz; Pulse width: 10μs; First pulse suppression width: 100μs.

[0094] The cut aluminum sheets are then cleaned using an ultrasonic cleaner with anhydrous ethanol as the cleaning solution. The cleaning time is 15 minutes. During cleaning, it is important to ensure that each aluminum sheet is fully in contact with the cleaning solution to prevent them from sticking together due to suction.

[0095] The cleaned aluminum sheets were dried using a forced-air drying oven. The cleaned samples were placed flat in the drying oven at 80°C for 15 minutes.

[0096] The prepared precursor solution was spin-coated onto the dried aluminum sheet at a spin speed of 2000 r / min to ensure that the precursor solution could be evenly coated on the surface of the aluminum sheet and to prevent excess precursor solution residue. After spin-coating once, the sheet was placed in a forced-air drying oven for preliminary heating and drying at a temperature of 90°C for 10 min. The spin-coating and heating and drying process was repeated three times.

[0097] The aluminum sheet coated with the precursor solution was placed in a muffle furnace for high-temperature treatment to achieve the final shaping of the surface structure and complete the transformation of zinc acetate to zinc oxide. The heating rate was 10℃ / min, the heating time was 90min, and the maximum temperature was 390℃ to ensure the full transformation of surface components and the formation of structure. The maximum temperature was held for 40min to ensure the full volatilization of ethylene glycol methyl ether. After heating, the sheet was cooled with the furnace until it reached room temperature to obtain an aluminum-based cooling heat sink.

[0098] Performance testing experiment

[0099] The heat dissipation performance of the aluminum-based cooling heat sinks prepared in Examples 1-3 was tested. Commercially available aluminum sheets of the same specifications were used as a comparison. The commercially available samples and the aluminum-based cooling heat sinks prepared in Examples 1-3 were placed on the same heating platform. The heating platform was initially set at 50°C, and the temperature was increased in 5°C increments. The temperatures of the commercially available samples and the aluminum-based cooling heat sinks prepared in Examples 1-3 were recorded, and curves showing the temperature change of the samples versus the heating platform were plotted. Figure 2 ;

[0100] Depend on Figure 2 It can be seen that the temperatures of the aluminum-based cooling heat sinks prepared in Examples 1-3 are all lower than those of commercially available raw aluminum sheets, and the temperature decreases with the increase of the number of coating layers. Figure 3 It can be seen that the temperature reduction ratio of the sample changes with the number of coating layers. When the coating reaches three layers, the increase in cooling effect is not significant compared to the two-layer coated aluminum sheet. Multiple heat dissipation performance tests were conducted on the two-layer coated sample, and the temperature change curve with the heating stage temperature was plotted. Figure 4 The curve and error bar show that its cooling effect is stable. Figure 5-7 These are thermal images (50℃, 65℃, 80℃) of the above heat dissipation performance test process. Figure 8 These are super-depth-of-field images of the original aluminum sheet and the aluminum-based cooling heat sink prepared according to the embodiments of the present invention.

[0101] In summary, it is evident that the aluminum-based cooling heat sink prepared by this invention possesses excellent thermal conductivity and heat dissipation performance. This invention, by mimicking the granular structure of insect surfaces, endows the aluminum substrate with nanoporous characteristics. Figure 9 The precursor solution can be converted into zinc oxide material, which can adhere to the nanoporous surface of the aluminum substrate, enhancing heat conduction and radiation, accelerating the diffusion of heat energy, and ultimately achieving a radiative cooling effect. Through the preparation method provided by this invention, and considering both cost and heat dissipation performance, the aluminum-based cooling heat sink with two coating layers has better advantages.

[0102] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for preparing an aluminum-based cooling heat sink, characterized in that, The preparation method includes the following steps: A precursor solution is prepared, wherein the precursor solution contains zinc acetate; The precursor solution is coated onto the surface of an aluminum substrate, and the aluminum substrate coated with the precursor solution is subjected to high-temperature treatment to obtain the aluminum-based cooling heat sink. The high-temperature treatment is performed at a temperature of 350-390℃ for 30-40 minutes. The aluminum substrate coated with the precursor solution is subjected to high-temperature treatment, specifically as follows: An aluminum substrate coated with a precursor solution is placed in a muffle furnace for high-temperature treatment. The heating rate is 5-10℃ / min, the heating time is 70-90min, the maximum temperature is 350-390℃, and the holding time of the maximum temperature is 30-40min. The aluminum substrate has a porous structure.

2. The method for preparing the aluminum-based cooling heat sink according to claim 1, characterized in that, The precursor solution includes zinc acetate, ethylene glycol methyl ether, and a stabilizer.

3. The method for preparing the aluminum-based cooling heat sink according to claim 2, characterized in that, In the precursor solution, the mass ratio of zinc acetate, ethylene glycol methyl ether, and stabilizer is (25-35):(90-110):(4-6).

4. The method for preparing the aluminum-based cooling heat sink according to claim 2, characterized in that, The preparation of the precursor solution is specifically as follows: Add the stabilizer to ethylene glycol methyl ether and stir for 10-15 minutes to obtain a mixed solution; Add zinc acetate to the mixed solution and stir for 30-40 minutes to obtain the precursor solution.

5. The method for preparing the aluminum-based cooling heat sink according to claim 1, characterized in that, The precursor solution is coated onto the surface of an aluminum substrate, specifically as follows: The precursor solution is spin-coated onto the surface of an aluminum substrate, and then the aluminum substrate with the precursor solution spin-coated is heated and dried.

6. The method for preparing the aluminum-based cooling heat sink according to claim 5, characterized in that, The spin coating speed is 1800-2400 r / min, and the spin coating time is 30 s; The heating temperature is 80-90℃, and the time is 5-10 minutes.

7. The method for preparing the aluminum-based cooling heat sink according to claim 1, characterized in that, Before coating the precursor solution onto the aluminum substrate surface, the method further includes the step of cleaning the aluminum substrate with anhydrous ethanol.

8. An aluminum-based cooling heat sink prepared by the preparation method according to any one of claims 1-7.

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