Memory alloy heat dissipation coating and preparation method thereof

Abstract

The invention relates to the technical field of electrical auxiliary materials, and particularly discloses a memory alloy heat dissipation coating and a preparation method thereof. A memory alloy heat dissipation coating comprises a graphene infrared radiation layer and a memory alloy dynamic convection heat dissipation material distributed on the graphene infrared radiation layer, and the graphene infrared radiation layer is prepared from the following raw materials in parts by weight: 35-45 parts of elemental carbon powder; 10-14 parts of alumina powder; 4-6 parts of a water-based adhesive; 30-40 parts of a water-based solvent; 6-10 parts of a filler; 1-3 parts of an antioxidant; the memory alloy dynamic convection heat dissipation material comprises sheet-shaped memory alloy heat dissipation particles, and the sheet-shaped memory alloy heat dissipation particles are prepared from the following raw materials in parts by weight: 65-75 parts of copper; 8-12 parts of neodymium iron boron magnet elementary substance powder; and 18-22 parts of magnetic deformation memory alloy powder. According to the memory alloy heat dissipation coating, the radiation and convection dual heat dissipation effect is achieved, and the heat dissipation effect is greatly improved for equipment with low surface temperature such as a transformer and a motor.

Description

Technical Field

[0001] The present application relates to the technical field of electrical auxiliary materials, and more specifically, to a memory alloy heat dissipation coating and a preparation method thereof. Background Art

[0002] There are three ways of heat conduction: convection, conduction and radiation; convection heat transfer refers to the heat transfer process caused by the relative displacement of particles in the fluid; heat conduction is the heat transfer phenomenon when there is no macroscopic movement in the medium, which can occur in solids, liquids and gases; radiation heat refers to the heat transferred by an object through thermal radiation.

[0003] Among them, radiation heat transfer is a highly efficient non-contact heat transfer process. The infrared radiation coating of the existing technology utilizes the special physical properties of nano-graphite. When coated on the surface of the heating element, it can increase the infrared emissivity of the heating element, strengthen the radiation heat transfer process, and increase the heat conduction per unit time, that is, improve the infrared radiation heat transfer capacity. For electrical equipment such as motors and transformers that are prone to heat, surface coating can increase the heat dissipation effect, reduce the energy consumption of conductive materials, improve work efficiency, and extend equipment life.

[0004] With respect to the above-mentioned related technologies, the inventors believe that for devices such as transformers and motors whose surface temperatures are not high, the low external temperature will cause heat to dissipate faster, increasing the difficulty of heat dissipation. It is difficult to achieve the expected heat dissipation effect by relying solely on radiation heat dissipation. Therefore, it is urgent to propose a solution to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to improve the heat dissipation effect of the coating on equipment with low surface temperature such as transformers and motors, the present application provides a memory alloy heat dissipation coating and a preparation method thereof.

[0006] In a first aspect, the present application provides a memory alloy heat dissipation coating, which adopts the following technical solution:

[0007] A memory alloy heat dissipation coating comprises a graphene infrared radiation layer and a memory alloy dynamic convection heat dissipation material disposed thereon, wherein the graphene infrared radiation layer is made of the following raw materials in parts by weight:

[0008] 35-45 parts of single carbon powder;

[0009] 10-14 parts of alumina powder;

[0010] 4-6 parts of water-based adhesive;

[0011] 30-40 parts of aqueous solvent;

[0012] 6-10 parts of filler;

[0013] 1-3 parts of antioxidants;

[0014] The memory alloy dynamic convection heat dissipation material comprises sheet-shaped memory alloy heat dissipation particles, and the sheet-shaped memory alloy heat dissipation particles are composed of the following raw materials in parts by weight:

[0015] Copper 65-75 parts;

[0016] 8-12 parts of Ru-Fe-B magnet powder;

[0017] 18-22 parts of magnetic deformation memory alloy powder.

[0018] By adopting the above technical scheme, the graphene infrared radiation layer mainly utilizes the high thermal conductivity and high emissivity characteristics of graphene. After being coated on the surface of an object, it can transfer heat to the coating and transfer it to the outside with high radiation heat dissipation capacity, thereby achieving efficient heat transfer or cooling effect; the memory alloy dynamic convection heat dissipation material mainly includes flaky memory alloy heat dissipation particles, which realize efficient heat conduction and heat dissipation through its shape memory effect and superelastic properties; at the same time, the distribution of the memory alloy dynamic convection heat dissipation material on the graphene infrared radiation layer is equivalent to forming many micro heat sinks, and utilizing the special magnetic sensitivity of the flaky memory alloy heat dissipation particles, when on the surface of the motor or transformer, it will undergo high-speed mechanical swings along the changes in the alternating magnetic field, which further forms a dynamic fan on the surface of the material, thereby doubling the heat dissipation effect of the coating. In this way, for equipment such as transformers and motors with low surface temperatures, the convection radiation enhancement effect along the airflow direction can be added on the basis of the graphene infrared radiation scheme, thereby greatly improving the heat dissipation effect.

[0019] Preferably, the sheet-shaped memory alloy heat dissipation particles have a thickness of 10-30 nm, and a length and width of 0.3-0.5 mm.

[0020] Preferably, the particle size of the elemental carbon powder is ≥10000 mesh; and the particle size of the alumina powder is 100-300 mesh.

[0021] Preferably, the water-based adhesive is any one of polyvinyl alcohol, vinyl acetate, acrylic, polyurethane and silicone.

[0022] Preferably, the aqueous solvent is one or a combination of water, ethanol, glycerol, polyethylene glycol, propylene glycol methyl ether, dipropylene glycol butyl ether and propylene carbonate.

[0023] Preferably, the filler is one or a combination of calcium carbonate, barite powder, talc powder, kaolin, mica powder, wollastonite, bentonite and quartz powder.

[0024] Preferably, it also includes an anti-oxidation nano protective layer placed on the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material, and the anti-oxidation nano protective layer is made of raw materials including the following parts by weight:

[0025] 1-2 parts of titanium dioxide particles;

[0026] 10-20 parts of inorganic solvent.

[0027] By adopting the above technical scheme, the anti-oxidation nano-protective layer is like a precision woven web in the microscopic world. It not only has extraordinary high-temperature stability and can maintain structural integrity and stable performance in extreme environments, but also has excellent anti-oxidation properties. It can effectively resist the penetration of corrosive media such as oxygen and water vapor, delay the aging process of the material, and significantly improve the durability and service life of the material. As a result, the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material can play a stable and excellent cooperative effect with each other during the application process, thereby bringing about excellent heat dissipation effect.

[0028] Preferably, the raw material of the graphene infrared radiation layer further comprises 3-5 parts by weight of a functional additive, wherein the functional additive is composed of water glass and boron nitride fiber, and the weight ratio of the water glass to the boron nitride fiber is 1:(4-6);

[0029] The memory alloy dynamic convection heat dissipation material is surface treated with a silane coupling agent solution before use.

[0030] By adopting the above technical scheme, boron nitride fibers can form an interlaced network structure in the graphene infrared radiation layer, which is not only conducive to the transmission of heat, but also can play a role in the structural embedding and fixing of the memory alloy dynamic convection heat dissipation material; at the same time, based on the cooperation between water glass and boron nitride fibers, and the silane surface modification treatment of the memory alloy dynamic convection heat dissipation material, the interface bonding between the treated memory alloy dynamic convection heat dissipation material and the graphene infrared radiation layer is made more stable, and when the sheet-like memory alloy heat dissipation particles undergo high-speed mechanical swing, they are not easy to partially detach or fall off, and heat transmission can be carried out stably and efficiently, and the combination of infrared radiation and convection along the airflow can bring better results, thereby further improving the heat dissipation effect of the memory alloy heat dissipation coating.

[0031] In a second aspect, the present application provides a method for preparing a memory alloy heat dissipation coating, which adopts the following technical solution:

[0032] A method for preparing a memory alloy heat dissipation coating comprises the following steps:

[0033] (1) preparing raw materials including simple carbon powder, aluminum oxide powder, water-based binder, water-based solvent, filler and antioxidant according to a proportion;

[0034] (2) The raw materials in step (1) are mixed evenly to obtain a graphene infrared radiation layer mixture, which is sprayed on the desired object base surface, and then the memory alloy dynamic convection heat dissipation material is sprayed, and then the surface is exceptionally stretched using a modified magnet, and then pulled back and forth in the direction of the air flow, and finally dried and shaped to obtain a memory alloy heat dissipation coating.

[0035] By adopting the above technical scheme, in the above operation, after the memory alloy dynamic convection heat dissipation material adheres to the surface of the graphene infrared radiation layer, the modified magnet is used to perform exceptional stretching on the surface so that the iron surface stands up, and then the modified magnet is pulled back and forth in the direction of airflow, such as along the heat dissipation ribs on the surface of equipment with low surface temperature such as transformers and motors, so that the flaky heat dissipation particles can be changed to a vertical state along the airflow direction, thereby achieving a dual heat dissipation effect of radiation and convection, which doubles the heat dissipation effect of the coating.

[0036] Preferably, the modified magnet is made of neodymium iron boron magnet, and its magnetic induction intensity is ≥0.8T at 0.1 meter, and the side of the modified magnet facing the coated base surface of the object is a horizontal structure.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. The present application realizes the dual heat dissipation effect of radiation and convection, and has a better heat dissipation effect for electrical equipment. The existing technology has a small heat dissipation optimization range for equipment with low surface temperature such as transformers and motors, and can generally only reduce the surface temperature rise by a few degrees. The present invention increases the convection radiation enhancement effect along the airflow direction, so that the heat dissipation effect of the coating is doubled. The special magnetic sensitivity of the memory alloy can produce high-speed mechanical swings in the change of the alternating magnetic field, which further forms a dynamic fan effect on the surface of the material. Especially in low temperature occasions below 80°C, the existing technology can only reduce about 5 degrees, and the present invention can reduce more than 20 degrees, greatly improving the heat dissipation effect;

[0039] 2. The present application uses a functional additive composed of water glass and boron nitride fiber in the graphene infrared radiation layer, and performs silane surface modification on the memory alloy dynamic convection heat dissipation material, so that the interface bonding between the treated memory alloy dynamic convection heat dissipation material and the graphene infrared radiation layer is more stable. When the sheet-like memory alloy heat dissipation particles undergo high-speed mechanical swing, heat transfer can be carried out stably and efficiently, and the combination of infrared radiation and convection along the air flow can bring better results, thereby further improving the heat dissipation effect of the memory alloy heat dissipation coating. DETAILED DESCRIPTION

[0040] The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0041] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of the present application are commercially available.

[0042] Example

[0043] Example 1

[0044] A memory alloy heat dissipation coating comprises a graphene infrared radiation layer and a memory alloy dynamic convection heat dissipation material disposed thereon, the raw materials used for preparing the graphene infrared radiation layer and their corresponding weights are shown in Table 1, the memory alloy dynamic convection heat dissipation material is a sheet-shaped memory alloy heat dissipation particle, the raw material composition of the memory alloy dynamic convection heat dissipation material is shown in Table 2, and the memory alloy dynamic convection heat dissipation material is prepared by the following steps:

[0045] (1) preparing raw materials including simple carbon powder, aluminum oxide powder, water-based binder, water-based solvent, filler and antioxidant according to a proportion;

[0046] (2) The raw materials in step (1) are mixed evenly to obtain a graphene infrared radiation layer mixture, which is sprayed on the desired object base surface, and then a powder spray pot is used to spray the memory alloy dynamic convection heat dissipation material, the nozzle of the powder spray pot has a spray angle of 30°, and a spray amount of 0.2 g / s, and then the surface is stretched exceptionally by using a modified magnet, and then pulled back and forth along the direction of air flow, and finally dried and shaped to form a memory alloy heat dissipation coating.

[0047] Note: For the above operation, the thickness of the sheet memory alloy heat dissipation particles is 20nm, and the length and width are 0.4mm; the single carbon powder is graphene, and the particle size is 10000 mesh; the particle size of the alumina powder is 100-300 mesh, and 200 mesh is selected in this embodiment; the water-based adhesive is polyvinyl alcohol; the water-based solvent is composed of water and polyethylene glycol in a weight ratio of 7:3; the filler is calcium carbonate; the antioxidant is 2,6-di-tert-butyl-4-methylphenol. The magnetic deformation memory alloy powder is Ni-Mn-Ga alloy powder. The modified magnet is made of Ru-Fe-B magnet, and its magnetic induction intensity is 0.8T at 0.1 meter, and the side of the modified magnet facing the object coating base is a horizontal structure.

[0048] Example 2-3

[0049] A memory alloy heat dissipation coating is different from Example 1 in that the raw materials used to prepare the graphene infrared radiation layer and their corresponding weights are shown in Table 1.

[0050] Table 1 Raw materials used in preparing the graphene infrared radiation layer in Examples 1-3 and their weight portions (kg / portion)

[0051] raw material Example 1 Example 2 Example 3 Single-element toner 40 35 45 Alumina powder 12 10 14 Water-based adhesive 5 4 6 Aqueous solvent 35 30 40 filler 8 6 10 Antioxidants 2 1 3

[0052] Embodiment 4-5

[0053] A memory alloy heat dissipation coating, which is different from Example 1 in that the raw material composition of the memory alloy dynamic convection heat dissipation material is as shown in Table 2.

[0054] Table 2 Raw material composition and weight portions (kg / portion) of memory alloy dynamic convection heat dissipation material in Examples 1, 4-5

[0055] raw material Example 1 Example 4 Example 5 copper 70 65 75 NiFeB magnet powder 10 8 12 Magnetic deformation memory alloy powder 20 18 22

[0056] Example 6

[0057] A memory alloy heat dissipation coating is different from Example 1 in that the thickness of the sheet-shaped memory alloy heat dissipation particles is 10 nm, and the length and width are 0.5 mm.

[0058] Example 7

[0059] A memory alloy heat dissipation coating is different from Example 1 in that the thickness of the sheet-shaped memory alloy heat dissipation particles is 30 nm, and the length and width are 0.3 mm.

[0060] Example 8

[0061] A memory alloy heat dissipation coating, which differs from Example 1 in that it also includes an anti-oxidation nano-protective layer placed on the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material, and the anti-oxidation nano-protective layer is formed by mixing the following raw materials in parts by weight and then spraying and drying: 1.5 parts of titanium dioxide particles; 15 parts of inorganic solvent; titanium dioxide particles larger than 500,000 mesh, and 600,000 mesh is selected in this embodiment.

[0062] Example 9

[0063] A memory alloy heat dissipation coating is different from Example 8 in that the anti-oxidation nano protective layer is formed by mixing the following raw materials in parts by weight and then spraying and drying: 1 part of titanium dioxide particles; 20 parts of inorganic solvent.

[0064] Example 10

[0065] A memory alloy heat dissipation coating is different from Example 8 in that the anti-oxidation nano protective layer is formed by mixing the following raw materials in parts by weight and then spraying and drying: 2 parts of titanium dioxide particles; 10 parts of inorganic solvent.

[0066] Embodiment 11

[0067] A memory alloy heat dissipation coating, which is different from Example 1 in that 4 parts by weight of a functional additive are further added to the raw material of the graphene infrared radiation layer, and the functional additive is composed of water glass and boron nitride fiber in a weight ratio of 1:5; the boron nitride fiber has a diameter of 10 nm and a length of 10 μm;

[0068] The memory alloy dynamic convection heat dissipation material is surface treated with a silane coupling agent solution before use. The specific operation is: immersing the memory alloy dynamic convection heat dissipation material in an 8% silane coupling agent solution for 50 seconds, drying the surface, and then aging at 100° C. for 30 minutes, wherein the silane coupling agent is KH550 type.

[0069] Example 12

[0070] A memory alloy heat dissipation coating, which is different from Example 11 in that the weight parts of the functional additive added is 3 parts.

[0071] Example 13

[0072] A memory alloy heat dissipation coating, which is different from Example 11 in that the weight parts of the functional additive added is 5 parts.

[0073] Embodiment 14

[0074] A memory alloy heat dissipation coating, which is different from Example 11 in that the functional additive is composed of water glass and boron nitride fiber in a weight ratio of 1:4.

[0075] Embodiment 15

[0076] A memory alloy heat dissipation coating, which is different from Example 11 in that the functional additive is composed of water glass and boron nitride fiber in a weight ratio of 1:6.

[0077] Example 16

[0078] A memory alloy heat dissipation coating, which is different from Example 11 in that boron nitride fiber is not used in the functional additive.

[0079] Embodiment 17

[0080] A memory alloy heat dissipation coating, which is different from Example 11 in that water glass is not used in the functional additive.

[0081] Embodiment 18

[0082] A memory alloy heat dissipation coating, which is different from Example 11 in that the memory alloy dynamic convection heat dissipation material is not surface treated.

[0083] Embodiment 19

[0084] A memory alloy heat dissipation coating, which is different from Example 11 in that no functional additive is used in the raw materials of the graphene infrared radiation layer.

[0085] Comparative Example

[0086] Comparative Example 1

[0087] A heat dissipation coating, which is different from embodiment 1 in that memory alloy dynamic convection heat dissipation material is not used.

[0088] Performance testing

[0089] Test samples: The memory alloy heat dissipation coatings obtained in Examples 1-19 were used as test samples 1-19, and the heat dissipation coating obtained in Comparative Example 1 was used as control sample 1.

[0090] Test method: A 48V-1.5KW-1500 rpm DC traction permanent magnet brushless motor is selected as the test motor. After scraping off the surface coating, the motor is operated normally for 10 hours. The temperature sensor installed inside the motor is used to measure the internal temperature of the motor at this time. The temperature value is A0, and the internal temperature of the motor is maintained below 80°C during the whole test. In the same way, after scraping off the surface coating, the heat dissipation coating in the test samples 1-19 and the control sample 1 is used respectively. After continuous operation at maximum power for 10 hours, the temperature sensor installed inside the motor is used to measure the internal temperature of the motor at this time. The temperature reduction value after using the heat dissipation coating is calculated. The temperature reduction value = A0-A1. The greater the temperature reduction value, the higher the heat dissipation effect of the heat dissipation coating. The test results of the test samples 1-19 and the control sample 1 are recorded in Table 3.

[0091] Table 3 Test results of test samples 1-19 and control sample 1

[0092]

[0093]

[0094] Combining Examples 1-5 and Comparative Example 1 and Table 3, it can be seen that the present application forms many micro heat sinks by distributing the dynamic convection heat dissipation material of the memory alloy on the graphene infrared radiation layer. At the same time, based on the special magnetic sensitivity of the memory alloy, when it is on the surface of the motor or transformer, it will undergo high-speed mechanical swing along the change of the alternating magnetic field, which further forms a dynamic fan on the surface of the material, so that the heat dissipation effect of the coating is doubled. For equipment such as transformers and motors with low surface temperatures, only the graphene infrared radiation layer is used in Comparative Example 1 to play a heat dissipation role, which can only reduce about 5°C. However, the present application adds the convection radiation enhancement effect along the airflow direction on the basis of the graphene infrared radiation scheme. In low-temperature occasions below 80°C, the present invention can achieve a reduction effect of more than 20 degrees, and the heat dissipation effect is greatly improved.

[0095] Combining Example 1 and Examples 6-7 with Table 3, it can be seen that the thickness of the sheet-shaped memory alloy heat dissipation particles is 10-30nm, and the length and width are 0.3-0.5mm, which can enable the memory alloy dynamic convection heat dissipation material and the graphene infrared radiation layer to exert an excellent and stable coordination effect, thereby bringing about excellent and stable heat dissipation performance.

[0096] It can be seen from Example 1 and Examples 8-10 and Table 3 that the use of the anti-oxidation nano protective layer can improve the excellent heat dissipation effect of the combination of the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material to a certain extent, thereby causing a certain increase in the temperature reduction value obtained in the above test.

[0097] It can be seen from Example 1 and Examples 11-15 and Table 3 that the present application can further improve the heat dissipation effect of the memory alloy heat dissipation coating by using a functional additive composed of water glass and boron nitride fiber in the graphene infrared radiation layer and performing silane surface modification on the memory alloy dynamic convection heat dissipation material, so that the temperature reduction value obtained by the test is significantly increased. It can be seen from Examples 16-17 and Table 3 that, among the functional additives, if only one of the water glass and boron nitride fiber is used, although it can bring about an improvement in heat dissipation performance, the improvement effect is far less than the excellent effect brought by the compounding of the two. It can be seen that the compounding application of water glass and boron nitride fiber in the graphene infrared radiation layer can bring a significant improvement effect to the interface bonding between the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material, so that the heat conduction loss capacity is significantly improved. Combined with Examples 18-19 and Table 3, it can be seen that the lack of functional additives in the graphene infrared radiation layer, or the failure to perform silane surface modification on the memory alloy dynamic convection heat dissipation material, will lead to a significant reduction in the heat dissipation capacity of the memory alloy heat dissipation coating. From the performance of the temperature reduction value, the two have a synergistic effect and are indispensable, which can ensure that the heat dissipation effect of the memory alloy heat dissipation coating is significantly improved.

[0098] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A memory alloy heat dissipation coating, characterized in that: The invention comprises a graphene infrared radiation layer and a memory alloy dynamic convection heat dissipation material distributed thereon, wherein the graphene infrared radiation layer is made of the following raw materials in parts by weight: 35-45 parts of single carbon powder; 10-14 parts of alumina powder; 4-6 parts of water-based adhesive; 30-40 parts of aqueous solvent; 6-10 parts of filler; 1-3 parts of antioxidants; The memory alloy dynamic convection heat dissipation material comprises sheet-shaped memory alloy heat dissipation particles, and the sheet-shaped memory alloy heat dissipation particles are composed of the following raw materials in parts by weight: Copper 65-75 parts; 8-12 parts of Ru-Fe-B magnet powder; 18-22 parts of magnetic deformation memory alloy powder.

2. The memory alloy heat dissipation coating according to claim 1, characterized in that: The sheet-shaped memory alloy heat dissipation particles have a thickness of 10-30 nm, and a length and a width of 0.3-0.5 mm.

3. The memory alloy heat dissipation coating according to claim 1, characterized in that: The particle size of the single-substance carbon powder is ≥10000 mesh; The particle size of the alumina powder is 100-300 meshes.

4. The memory alloy heat dissipation coating according to claim 1, characterized in that: The water-based adhesive is any one of polyvinyl alcohol, vinyl acetate, acrylic, polyurethane and silicone.

5. The memory alloy heat dissipation coating according to claim 1, characterized in that: The aqueous solvent is one or a combination of water, ethanol, glycerol, polyethylene glycol, propylene glycol methyl ether, dipropylene glycol butyl ether and propylene carbonate.

6. The memory alloy heat dissipation coating according to claim 1, characterized in that: The filler is one or a combination of calcium carbonate, barite powder, talcum powder, kaolin, mica powder, wollastonite, bentonite and quartz powder.

7. The memory alloy heat dissipation coating according to claim 1, characterized in that: It also includes an anti-oxidation nano protective layer placed on the graphene infrared radiation layer and the memory alloy dynamic convection heat dissipation material, wherein the anti-oxidation nano protective layer is made of the following raw materials in parts by weight: 1-2 parts of titanium dioxide particles; 10-20 parts of inorganic solvent.

8. The memory alloy heat dissipation coating according to claim 1, characterized in that: The raw material of the graphene infrared radiation layer is further added with 3-5 parts by weight of a functional additive, wherein the functional additive is composed of water glass and boron nitride fiber, and the weight ratio of the water glass to the boron nitride fiber is 1:(4-6); The memory alloy dynamic convection heat dissipation material is surface treated with a silane coupling agent solution before use.

9. The method for preparing the memory alloy heat dissipation coating according to claim 1, characterized in that: The following steps are involved: (1) preparing raw materials including simple carbon powder, aluminum oxide powder, water-based binder, water-based solvent, filler and antioxidant according to a proportion; (2) The raw materials in step (1) are mixed evenly to obtain a graphene infrared radiation layer mixture, which is sprayed on the desired object base surface, and then the memory alloy dynamic convection heat dissipation material is sprayed, and then the surface is exceptionally stretched using a modified magnet, and then pulled back and forth in the direction of the air flow, and finally dried and shaped to obtain a memory alloy heat dissipation coating.

10. The method for preparing the memory alloy heat dissipation coating according to claim 9, characterized in that: The modified magnet is made of neodymium iron boron magnet, and its magnetic induction intensity is ≥0.8T at 0.1 meter, and the side of the modified magnet facing the coated base surface of the object is a horizontal structure.

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