A high-efficiency preparation method of a precise temperature control liquid metal heat dissipation gasket

Abstract

The application discloses a kind of high-efficiency preparation methods of precision temperature control liquid metal heat dissipation gasket, it is related to heat dissipation gasket preparation technical field, the specific steps of the preparation method are as follows: S100, material preparation: liquid metal material selects gallium-indium alloy, reinforcing fiber selects carbon fiber, adhesive selects high-temperature-resistant organic silicon adhesive, the application is carefully designed and accurately controlled by being set with multiple heating stages, and the temperature, heating time and temperature rising rate of each stage, in initial stage, lower temperature and slower temperature rising rate are used, material is gradually preheated, and volatile substances in it are effectively removed, lay a good foundation for subsequent reaction, after entering intermediate stage, temperature is increased to promote the full mixing and reaction of liquid metal and other materials, the microstructure of gasket is optimized, to improve its performance, in last stage, gasket is solidified by reducing temperature Forming, this process ensures the structural stability and performance reliability of gasket.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation pad preparation technology, specifically to an efficient method for preparing precisely temperature-controlled liquid metal heat dissipation pads. Background Technology

[0002] With the rapid development of modern electronic devices, the requirements for heat dissipation materials are increasing. Liquid metal heat dissipation pads, as a new type of heat dissipation material, have shown great application potential in the field of electronic device heat dissipation due to their excellent thermal conductivity and plasticity. Liquid metals, such as gallium-indium alloys, have low melting points, high thermal conductivity, and good fluidity, making them ideal materials for preparing high-performance heat dissipation pads. However, the preparation process of liquid metal heat dissipation pads is complex and requires precise control of key steps such as material mixing, reaction, and curing to ensure the structural stability and performance reliability of the pads.

[0003] Traditional methods for preparing liquid metal heat sinks often employ a single heating stage, lacking precise control over temperature, heating time, and heating rate. This approach easily leads to uneven material mixing and suboptimal microstructure, affecting the heat conduction and heat dissipation efficiency of the sink. Furthermore, traditional methods typically do not apply an external magnetic field, making it impossible to precisely control the flow and solidification process of the liquid metal. This results in limitations in the performance of the prepared liquid metal heat sinks, such as unstable thermal conductivity, low heat dissipation efficiency, and poor structural stability. Therefore, there is an urgent need for a novel preparation method that can precisely control the preparation process of liquid metal heat sinks, optimize their microstructure, and improve their performance to meet the high requirements of modern electronic devices for heat dissipation materials.

[0004] Therefore, a highly efficient method for preparing liquid metal heat dissipation pads with precise temperature control was developed. By setting multiple heating stages and precisely controlling the temperature, heating time, and heating rate of each stage, and by applying an external magnetic field, the liquid metal was fully mixed and reacted with other materials, thereby improving the thermal conductivity and stability of the heat dissipation pads. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a highly efficient method for preparing precisely temperature-controlled liquid metal heat dissipation pads. This method uses gallium-indium alloy as the liquid metal material, carbon fiber as the reinforcing fiber, and high-temperature resistant organosilicon adhesive as the binder. Through multi-stage heating and magnetic field-assisted control, the liquid metal is fully mixed and reacted with other materials to optimize the microstructure. During the preparation process, the strength, direction, and frequency of the magnetic field, as well as the heating and cooling rates, are precisely controlled to ensure the quality of the pad forming. Finally, after forming treatment and quality inspection, a liquid metal heat dissipation pad that meets the requirements is obtained.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a highly efficient method for preparing a precise temperature-controlled liquid metal heat dissipation pad, the specific steps of which are as follows:

[0007] S100, Material preparation: The liquid metal material is selected from gallium indium alloy, the reinforcing fiber is selected from carbon fiber, and the adhesive is selected from high temperature resistant silicone adhesive. The liquid metal material, reinforcing fiber and adhesive are cleaned and dried separately to remove impurities and moisture.

[0008] S200, Magnetic field setting: An adjustable magnetic field generator is set around the preparation equipment to precisely control the parameters of the magnetic field strength, direction and frequency;

[0009] S300, multi-stage heating and magnetic field-assisted control:

[0010] Initial stage: The mixed material is placed in the heating equipment, and a weak magnetic field is turned on at the same time. The temperature is 55℃-65℃ and the heating rate is 1.2℃ / min-1.8℃ / min. The material is gradually preheated and the remaining moisture and other volatile substances are removed. The magnetic field strength is set to 0.1 Tesla and the direction is perpendicular to the heating equipment. The magnetic field makes the tiny particles in the material evenly distributed.

[0011] Intermediate stage: Increase the temperature to the reaction temperature of 170℃-190℃, and the heating rate can be adjusted between 5℃ / min and 7℃ / min. Increase the magnetic field strength to 0.4-0.6 Tesla. The magnetic field generates Lorentz force on the electrons and ions in the liquid metal, which promotes the full mixing and reaction of the liquid metal with other materials and optimizes the microstructure.

[0012] Final stage: A segmented cooling method is adopted. First, the temperature is lowered to 120℃-130℃ at a relatively fast cooling rate of 3℃ / min-4℃ / min, and then lowered to the curing temperature at a slower cooling rate of 1.2℃ / min-1.8℃ / min. At the same time, the magnetic field is weakened to between 0.08-0.12 Tesla to allow the gasket to cure and form.

[0013] S400, Molding process: After curing and molding, the gasket is cooled to room temperature. The cooled gasket is then laser-cut and sanded to meet the required size and shape requirements.

[0014] S500, Quality Inspection: The prepared liquid metal heat dissipation pads are subjected to quality inspection, including visual inspection, dimensional measurement, and thermal conductivity testing. Unqualified pads are reworked.

[0015] Furthermore, in S100, the content of gallium in the liquid metal material during material preparation is 70%-80%, and the content of indium is 20%-30%. The pretreatment adopts a combination of ultrasonic cleaning and vacuum drying. The cleaning time is 10-15 minutes, and the vacuum drying temperature is 55℃-65℃ for 2.5-3.5 hours.

[0016] Furthermore, in the S100 material preparation, the carbon fiber diameter is 5-10 micrometers and the length is 1-2 millimeters. The surface is treated by soaking in a coupling agent for 30-60 minutes.

[0017] Furthermore, in S100, the amount of silicone adhesive used in the material preparation is 5%-10% of the total mass of the liquid metal material and reinforcing fibers.

[0018] Furthermore, in S200, the magnetic field generating device in the magnetic field setting adopts an electromagnetic coil group, which can adjust the magnetic field strength between 0.05-1 Tesla, the direction is perpendicular to the heating device or at a certain angle to the heating device, the angle adjustment range is 0°-90°, and the frequency is adjustable between 10-100 Hz.

[0019] Furthermore, in S300, the initial stage of multi-stage heating and magnetic field-assisted control lasts for 10-20 minutes, and a stirring operation can be added during the initial stage, with a stirring speed of 20-30 revolutions per minute.

[0020] Furthermore, in S300, the intermediate stage of multi-stage heating and magnetic field-assisted control lasts for 20-30 minutes, and the angle between the magnetic field direction and the heating direction can be adjusted as needed, with the angle ranging from 30° to 60°.

[0021] Furthermore, in the S300, the final stage of multi-stage heating and magnetic field-assisted control lasts for 15-25 minutes, and the magnetic field angle does not need to be changed.

[0022] Furthermore, in S300, the curing temperature of the metal gasket in the multi-stage heating and magnetic field-assisted control is 80℃-110℃, and the curing time is 15-25 minutes.

[0023] Furthermore, in the S400 molding process, natural cooling is used for cooling, which takes 1-2 hours.

[0024] Compared with existing technologies, this method for the efficient preparation of precisely temperature-controlled liquid metal heat dissipation pads has the following advantages:

[0025] I. This invention sets up multiple heating stages, with meticulous design and precise control over the temperature, heating time, and heating rate of each stage. In the initial stage, a lower temperature and slower heating rate are used to gradually preheat the material and effectively remove moisture and other volatile substances, laying a good foundation for subsequent reactions. In the intermediate stage, the temperature is increased to promote the full mixing and reaction of the liquid metal with other materials, optimizing the microstructure of the gasket and thus improving its performance. In the final stage, the temperature is lowered to solidify the gasket. This process ensures the structural stability and performance reliability of the gasket. Multi-stage heating control not only improves the preparation efficiency but also significantly enhances the overall quality of the liquid metal heat dissipation gasket.

[0026] II. This invention applies an external magnetic field to generate Lorentz forces on electrons and ions in liquid metal, thereby affecting the flow and solidification process of the liquid metal. By precisely controlling the parameters of the magnetic field's strength, direction, and frequency, the microstructure and performance of the liquid metal heat dissipation pad are precisely controlled. This control method not only improves the thermal conductivity of the pad but also gives it a more uniform microstructure, thereby further improving the heat dissipation efficiency and stability of the pad. The introduction of the magnetic field-assisted preparation method makes the preparation process of liquid metal heat dissipation pads more flexible and controllable, providing new ideas and methods for preparing high-performance heat dissipation pads.

[0027] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0029] Figure 1 This is a flowchart of a highly efficient method for preparing a precisely temperature-controlled liquid metal heat dissipation pad. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Comparative Example 1:

[0032] Material preparation stage: A gallium-indium alloy with a gallium content of 75% and an indium content of 25% was selected as the liquid metal material, with a total weight of 900 grams. The alloy was ultrasonically cleaned for 12 minutes and then dried in a vacuum environment at 60°C for 3 hours to thoroughly remove impurities and moisture. Carbon fibers with a diameter of 7 micrometers and a length of 1.5 millimeters were prepared as reinforcing fibers, with a total weight of 100 grams. The carbon fibers were soaked in a coupling agent for 45 minutes to improve their surface properties and facilitate subsequent bonding with other materials. A high-temperature resistant silicone adhesive was selected, with an amount of 8% of the total weight of the liquid metal material and reinforcing fibers, i.e., 80 grams, to ensure effective bonding of the materials during the preparation process.

[0033] Magnetic field setting stage: Install an electromagnetic coil group around the preparation equipment as a magnetic field generating device. The magnetic field generating device can be an electromagnetic coil group, which can finely adjust the magnetic field strength between 0.05-1 Tesla. The direction is perpendicular to the heating equipment or at a certain angle to the heating equipment. The angle adjustment range is 0°-90°, and the frequency is adjusted between 10-100 Hz.

[0034] Multi-stage heating and magnetic field-assisted control stage:

[0035] Initial stage (15 minutes): Place the mixed materials into the heating equipment and start the heating program at a temperature of 60℃ and a heating rate of 1.5℃ / min. At the same time, start the magnetic field and stir the materials at a speed of 25 revolutions / minute to ensure that the materials are heated evenly and gradually remove the remaining moisture and volatile substances. The magnetic field strength is 0.1 Tesla and is perpendicular to the heating equipment to promote the uniform distribution of small particles in the materials.

[0036] Intermediate stage (25 minutes): Increase the temperature to 180℃, adjust the heating rate to 6℃ / min, increase the magnetic field strength to 0.5 Tesla, and adjust the angle between the magnetic field direction and the heating direction to 45°. Utilize the Lorentz force of the magnetic field on the electrons and ions in the liquid metal to promote the full mixing and reaction of the liquid metal with the carbon fiber and binder, thereby optimizing the microstructure.

[0037] Final stage (20 minutes): First, rapidly cool down to 125℃ at a rate of 3.5℃ / min, then slowly cool down to 95℃ (curing temperature) at a rate of 1.5℃ / min. At the same time, reduce the magnetic field to 0.1 Tesla while keeping the magnetic field direction unchanged to allow the gasket to cure and form, ensuring that the internal structure of the gasket is stable and uniform.

[0038] Molding stage: After curing and molding, allow the pad to cool naturally to room temperature for 1.5 hours. Use laser cutting equipment to cut the pad into the size that fits the high-performance computer heat dissipation module, such as 50 mm long, 40 mm wide and 3 mm thick. Then use sandpaper to finely polish the surface of the pad to ensure that its surface is smooth and flat, so as to meet the precision size and shape requirements of the high-performance computer heat dissipation system for the heat dissipation pad.

[0039] Quality Inspection Stage: A comprehensive quality inspection is conducted on the prepared liquid metal heat dissipation pads, including visual inspection to ensure that the surface is free of defects and bubbles, precise measurement of dimensions to confirm that the length, width, and height errors are within ±0.1 mm, and thermal conductivity testing using a professional thermal conductivity meter. The test results show that the thermal conductivity of the heat dissipation pads prepared under this comparative model is above 50 W / (m·K). If the thermal conductivity of a certain batch of pads is found to be lower than that, the batch of pads is returned for re-preparation. Strict control of each process parameter ensures that the final product quality fully meets the high standards required for high-performance computer cooling systems.

[0040] Comparative Example 2:

[0041] Material preparation stage: Gallium-indium alloy with a gallium content of 75% and an indium content of 25% is selected as liquid metal material, with a total weight of 900 grams. The alloy is ultrasonically cleaned for 12 minutes and then dried in a vacuum environment at 60°C for 3 hours. Carbon fibers with a diameter of 7 micrometers and a length of 1.5 millimeters are prepared as reinforcing fibers, with a total weight of 100 grams. The carbon fibers are soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive is selected, with a usage of 8% of the total weight of the liquid metal material and reinforcing fibers, i.e., 80 grams.

[0042] Magnetic field setting stage: Install an electromagnetic coil group around the preparation equipment as a magnetic field generating device. The magnetic field generating device uses an electromagnetic coil group, which can finely adjust the magnetic field strength between 0.05-1 Tesla. The direction is perpendicular to the heating equipment or at a certain angle to the heating equipment. The angle adjustment range is 0°-90°, and the frequency is adjusted between 10-100 Hz.

[0043] Multi-stage heating and magnetic field-assisted control stage:

[0044] Initial stage (15 minutes): Place the mixed material into the heating device and start the heating program at a temperature of 50°C (60°C in the comparative example) and a heating rate of 1.5°C / min. At the same time, start the magnetic field to stir the material at a speed of 25 revolutions / minute. The magnetic field strength is 0.1 Tesla and is perpendicular to the heating device.

[0045] Intermediate stage (25 minutes): Increase the temperature to 180℃, adjust the heating rate to 6℃ / min, increase the magnetic field strength to 0.5 Tesla, and adjust the angle between the magnetic field direction and the heating direction to 45°.

[0046] Final stage (20 minutes): First, rapidly cool down to 125℃ at a rate of 3.5℃ / min, then slowly cool down to 95℃ at a rate of 1.5℃ / min, while simultaneously weakening the magnetic field to 0.1 Tesla, with the magnetic field direction remaining unchanged.

[0047] Molding process: After curing and molding, allow the gasket to cool naturally to room temperature for 1.5 hours. Use laser cutting equipment to cut the gasket to the size that fits the heat dissipation module of a high-performance computer, and then use sandpaper to finely polish the surface of the gasket.

[0048] Quality inspection stage: The prepared liquid metal heat dissipation pads are subjected to comprehensive quality inspection, including appearance inspection, dimensional measurement (with the same accuracy requirements as the example), and thermal conductivity testing. The test results show that the thermal conductivity of the heat dissipation pads prepared in this comparative example is approximately 42 W / (m·K).

[0049] Comparative Example 3:

[0050] Material preparation stage: Gallium-indium alloy with a gallium content of 75% and an indium content of 25% is selected as liquid metal material, with a total weight of 900 grams. The alloy is ultrasonically cleaned for 12 minutes and then dried in a vacuum environment at 60°C for 3 hours. Carbon fibers with a diameter of 7 micrometers and a length of 1.5 millimeters are prepared as reinforcing fibers, with a total weight of 100 grams. The carbon fibers are soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive is selected, with a usage of 8% of the total weight of the liquid metal material and reinforcing fibers, i.e., 80 grams.

[0051] Magnetic field setting stage: Install an electromagnetic coil group around the preparation equipment as a magnetic field generating device. The magnetic field generating device uses an electromagnetic coil group, which can finely adjust the magnetic field strength between 0.05-1 Tesla. The direction is perpendicular to the heating equipment or at a certain angle to the heating equipment. The angle adjustment range is 0°-90°, and the frequency is adjusted between 10-100 Hz.

[0052] Multi-stage heating and magnetic field-assisted control stage:

[0053] Initial stage (15 minutes): Place the mixed materials into the heating equipment, start the heating program at a temperature of 60℃ and a heating rate of 1.5℃ / min, and simultaneously start the magnetic field to stir the materials at a speed of 25 revolutions / minute with a magnetic field strength of 0.1 Tesla, perpendicular to the heating equipment.

[0054] Intermediate stage (25 minutes): Increase the temperature to 160°C (180°C in the comparative example), adjust the heating rate to 6°C / min, increase the magnetic field strength to 0.5 Tesla, and adjust the angle between the magnetic field direction and the heating direction to 45°.

[0055] Final stage (20 minutes): First, rapidly cool down to 125℃ at a rate of 3.5℃ / min, then slowly cool down to 95℃ at a rate of 1.5℃ / min, while simultaneously weakening the magnetic field to 0.1 Tesla, with the magnetic field direction remaining unchanged.

[0056] Molding process: After curing and molding, allow the gasket to cool naturally to room temperature for 1.5 hours. Use laser cutting equipment to cut the gasket to the size that fits the heat dissipation module of a high-performance computer, and then use sandpaper to finely polish the surface of the gasket.

[0057] Quality inspection stage: The prepared liquid metal heat dissipation pads are subjected to comprehensive quality inspection, including appearance inspection, dimensional measurement, and thermal conductivity testing. The test results show that the thermal conductivity of the heat dissipation pads prepared in this comparative example is approximately 45 W / (m·K).

[0058] Comparative Example 4

[0059] Material preparation stage: Gallium-indium alloy with a gallium content of 75% and an indium content of 25% is selected as liquid metal material, with a total weight of 900 grams. The alloy is ultrasonically cleaned for 12 minutes and then dried in a vacuum environment at 60°C for 3 hours. Carbon fibers with a diameter of 7 micrometers and a length of 1.5 millimeters are prepared as reinforcing fibers, with a total weight of 100 grams. The carbon fibers are soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive is selected, with a usage of 8% of the total weight of the liquid metal material and reinforcing fibers, i.e., 80 grams.

[0060] Magnetic field setting stage: Install an electromagnetic coil group around the preparation equipment as a magnetic field generating device. The magnetic field generating device uses an electromagnetic coil group, which can finely adjust the magnetic field strength between 0.05-1 Tesla. The direction is perpendicular to the heating equipment or at a certain angle to the heating equipment. The angle adjustment range is 0°-90°, and the frequency is adjusted between 10-100 Hz.

[0061] Multi-stage heating and magnetic field-assisted control stage:

[0062] Initial stage (15 minutes): Place the mixed materials into the heating equipment, start the heating program at a temperature of 60℃ and a heating rate of 1.5℃ / min, and simultaneously start the magnetic field to stir the materials at a speed of 25 revolutions / minute with a magnetic field strength of 0.1 Tesla, perpendicular to the heating equipment.

[0063] Intermediate stage (25 minutes): Increase the temperature to 180℃, adjust the heating rate to 6℃ / min, increase the magnetic field strength to 0.5 Tesla, and adjust the angle between the magnetic field direction and the heating direction to 45°.

[0064] Final stage (20 minutes): First, rapidly cool to 125°C at a rate of 5°C / min (3.5°C / min in the comparative example), then slowly cool to 95°C at a rate of 1.5°C / min, while simultaneously reducing the magnetic field to 0.1 Tesla, with the magnetic field direction remaining unchanged.

[0065] Molding process: After curing and molding, allow the gasket to cool naturally to room temperature for 1.5 hours. Use laser cutting equipment to cut the gasket to the size that fits the heat dissipation module of a high-performance computer, and then use sandpaper to finely polish the surface of the gasket.

[0066] Quality inspection stage: The prepared liquid metal heat dissipation pads are subjected to comprehensive quality inspection, including appearance inspection, dimensional measurement (with the same accuracy requirements as the example), and thermal conductivity testing. The test results show that the thermal conductivity of the heat dissipation pads prepared in this comparative example is approximately 40 W / (m·K).

[0067] These four comparative examples demonstrate that temperature significantly impacts thermal conductivity during the fabrication of liquid metal heat sinks. If the initial temperature deviates from the optimal range, it affects the pre-treatment of the materials, hindering subsequent reactions and resulting in a decrease in thermal conductivity. Inappropriate temperatures in the intermediate stages impede the thorough mixing and reaction of the liquid metal with other materials, preventing optimization of the microstructure and leading to suboptimal thermal conductivity. An improper cooling rate in the final stage causes abnormalities in the internal structure of the pad, generating stress problems and similarly reducing thermal conductivity. Therefore, precise temperature control at each stage is crucial for obtaining high-thermal-conductivity liquid metal heat sinks. A suitable temperature regime should be strictly followed during fabrication to ensure the high performance of the heat sink.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A highly efficient method for preparing a precisely temperature-controlled liquid metal heat dissipation pad, characterized in that, The specific steps of this preparation method are as follows: S100, Material preparation: The liquid metal material is selected from gallium indium alloy, the reinforcing fiber is selected from carbon fiber, and the adhesive is selected from high temperature resistant silicone adhesive. The liquid metal material, reinforcing fiber and adhesive are cleaned and dried separately to remove impurities and moisture, and then mixed to obtain a well mixed material. S200, Magnetic field setting: An adjustable magnetic field generator is set around the preparation equipment to precisely control the parameters of the magnetic field strength, direction and frequency; S300, multi-stage heating and magnetic field-assisted control: Initial stage: The mixed material is placed in the heating equipment, and a weak magnetic field is turned on at the same time. The temperature is 55℃-65℃ and the heating rate is 1.2℃ / min-1.8℃ / min. The material is gradually preheated and the remaining moisture and other volatile substances are removed. The magnetic field strength is set to 0.1 Tesla and the direction is perpendicular to the heating equipment. The magnetic field makes the tiny particles in the material evenly distributed. Intermediate stage: Increase the temperature to the reaction temperature of 170℃-190℃, adjust the heating rate between 5℃ / min and 7℃ / min, and increase the magnetic field strength to 0.4-0.6 Tesla. The magnetic field generates Lorentz force on the electrons and ions in the liquid metal, promoting the full mixing and reaction of the liquid metal with carbon fibers and binders, and optimizing the microstructure. The duration of the intermediate stage is 20-30 minutes. Adjust the direction of the magnetic field and the angle of the heating equipment as needed, with an angle range of 30°-60°. Final stage: A segmented cooling method is adopted. First, the temperature is lowered to 120℃-130℃ at a relatively fast cooling rate of 3℃ / min-4℃ / min, and then lowered to the curing temperature at a slower cooling rate of 1.2℃ / min-1.8℃ / min. At the same time, the magnetic field is weakened to between 0.08-0.12 Tesla. The duration of the final stage is 15-25 minutes. The magnetic field angle does not need to be changed, and the cured gasket is obtained. S400, Molding process: After curing and molding, the gasket is cooled to room temperature. The cooled gasket is then laser-cut and sanded to meet the required size and shape requirements. S500, Quality Inspection: The prepared liquid metal heat dissipation pads are subjected to quality inspection, including visual inspection, dimensional measurement, and thermal conductivity testing. Unqualified pads are reworked.

2. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, In S100, the content of gallium in the liquid metal material during material preparation is 70%-80%, and the content of indium is 20%-30%. Ultrasonic cleaning and vacuum drying are combined. The cleaning time is 10-15 minutes, and the vacuum drying temperature is 55℃-65℃ for 2.5-3.5 hours.

3. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 2, characterized in that, In the S100 material preparation, the carbon fiber diameter is 5-10 micrometers and the length is 1-2 millimeters. The surface of the carbon fiber is treated by soaking in a coupling agent for 30-60 minutes.

4. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, In S100, the amount of silicone adhesive used in material preparation is 5%-10% of the total mass of liquid metal material and reinforcing fiber.

5. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, In S200, the magnetic field generating device in the magnetic field setting adopts an electromagnetic coil group, which can adjust the magnetic field strength between 0.05-1 Tesla, the magnetic field direction is at a certain angle to the heating equipment, the angle adjustment range is 0°-90°, and the frequency is adjustable between 10-100 Hz.

6. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, The initial stage of the multi-stage heating and magnetic field-assisted control in S300 lasts for 10-20 minutes, and a stirring operation is added in the initial stage with a stirring speed of 20-30 revolutions per minute.

7. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, In the S300, the curing temperature of the metal gasket in the multi-stage heating and magnetic field-assisted control is 80℃-110℃, and the curing time is 15-25 minutes.

8. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that, In the S400 molding process, the cooling process adopts natural cooling, which takes 1-2 hours.

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