Efficient preparation method of precise temperature control liquid metal heat dissipation gasket

Abstract

The invention discloses an efficient preparation method of a precise temperature control liquid metal heat dissipation gasket, and relates to the technical field of heat dissipation gasket preparation, the preparation method comprises the following specific steps: S100, material preparation: selecting a gallium-indium alloy as a liquid metal material, selecting carbon fibers as reinforcing fibers, selecting a high-temperature-resistant organic silicon adhesive as an adhesive, and preparing materials; a plurality of heating stages are set, the temperature, the heating time and the heating rate of each stage are elaborately designed and accurately controlled, and in the initial stage, the lower temperature and the lower heating rate are adopted, so that the material is gradually preheated, and water and other volatile substances in the material are effectively removed; after entering the middle stage, the temperature is increased to promote full mixing and reaction of liquid metal and other materials and optimize the microstructure of the gasket, so that the performance of the gasket is improved, and in the final stage, the gasket is cured and formed by reducing the temperature, and the process ensures the structural stability and performance reliability of the gasket.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation gasket preparation, and in particular to a method for efficiently preparing a precisely temperature-controlled liquid metal heat dissipation gasket. Background Art

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

[0003] The preparation method of traditional liquid metal heat sink gaskets often adopts a single heating stage and lacks precise control over temperature, heating time and heating rate. This preparation method easily leads to uneven material mixing and non-optimized microstructure, which affects the thermal conductivity and heat dissipation efficiency of the gasket. In addition, traditional methods usually do not apply an external magnetic field and cannot accurately control the flow and solidification process of liquid metal. This leads to certain limitations in the performance of the prepared liquid metal heat sink gasket, such as unstable thermal conductivity, low heat dissipation efficiency and poor structural stability. Therefore, there is an urgent need for a new preparation method that can accurately control the preparation process of liquid metal heat sink gaskets, optimize their microstructure, and improve their performance to meet the high requirements of modern electronic devices for heat dissipation materials.

[0004] Therefore, an efficient preparation method for liquid metal heat sink gaskets 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 applying an external magnetic field, the liquid metal and other materials were fully mixed and reacted, thereby improving the thermal conductivity and stability of the heat sink gasket. Summary of the invention

[0005] The purpose of the present invention is to make up for the shortcomings of the prior art and provide an efficient preparation method for a precisely temperature-controlled liquid metal heat dissipation gasket. The method uses gallium-indium alloy as the liquid metal material, carbon fiber as the reinforcing fiber, and a high-temperature resistant silicone adhesive as the adhesive. Through multi-stage heating and magnetic field-assisted control, the liquid metal and other materials are fully mixed and reacted, and the microstructure is optimized. During the preparation process, the intensity, direction and frequency of the magnetic field, as well as the heating and cooling rates are precisely controlled to ensure the molding quality of the gasket. Finally, after molding processing and quality inspection, a liquid metal heat dissipation gasket that meets the requirements is obtained.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a highly efficient preparation method of a precise temperature-controlled liquid metal heat dissipation gasket, the specific steps of which are:

[0007] S100, material preparation: the liquid metal material is gallium-indium alloy, the reinforcing fiber is carbon fiber, and the adhesive is 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 generating device is set around the preparation equipment to accurately control the parameters of the intensity, direction and frequency of the magnetic field;

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

[0010] Initial stage: put the mixed materials into the heating equipment, turn on a weak magnetic field, use a temperature of 55℃-65℃, and a heating rate of 1.2℃ / min-1.8℃ / min to gradually preheat the materials and remove the remaining moisture and other volatile substances. The magnetic field strength is set to 0.1 Tesla, and the direction is perpendicular to the heating equipment. The tiny particles in the material are evenly distributed through the effect of the magnetic field.

[0011] Intermediate stage: Raise the temperature to the reaction temperature of 170℃-190℃, the heating rate can be adjusted between 5℃ / min-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, promotes the full mixing and reaction of the liquid metal with other materials, and optimizes the microstructure.

[0012] The final stage: adopt the segmented cooling method, first cool down to 120℃-130℃ at a faster cooling rate of 3℃ / min-4℃ / min, then cool down to the curing temperature at a slower cooling rate of 1.2℃ / min-1.8℃ / min, and at the same time weaken the magnetic field to between 0.08-0.12 Tesla to solidify the gasket;

[0013] S400, molding treatment: After curing and molding, the gasket is cooled to room temperature, and the cooled gasket is laser cut and sanded to meet the required size and shape requirements;

[0014] S500, quality inspection: Perform quality inspection on the prepared liquid metal heat sink gasket, including appearance inspection, dimension measurement, and thermal conductivity test. For unqualified gaskets, rework will be carried out.

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

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

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

[0018] Furthermore, in the 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 adjusted between 10-100 Hz.

[0019] Furthermore, in the S300, the duration of the initial stage in the multi-stage heating and magnetic field assisted control is 10-20 minutes, and a stirring operation can be added in the initial stage, and the stirring speed is 20-30 rpm.

[0020] Furthermore, in the S300, the duration of the middle stage in the multi-stage heating and magnetic field assisted control is 20-30 minutes, and the angle between the magnetic field direction and the heating direction can be adjusted as needed, and the angle range is 30°-60°.

[0021] Furthermore, in said S300, the last stage in the 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 the S300, the curing temperature of the metal gasket in the multi-stage heating and magnetic field assisted control is 80°C-110°C, and the curing time is 15-25 minutes.

[0023] Furthermore, in the S400, the cooling during the molding process is performed by natural cooling for 1-2 hours.

[0024] Compared with the prior art, this method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad has the following beneficial effects:

[0025] 1. The present invention sets multiple heating stages, and carefully designs and accurately controls the temperature, heating time and heating rate of each stage. In the initial stage, a lower temperature and a slower heating rate are adopted to gradually preheat the material and effectively remove the moisture and other volatile substances therein, thereby laying a good foundation for subsequent reactions. After entering the intermediate stage, the temperature is increased to promote the full mixing and reaction of liquid metal and other materials, optimize the microstructure of the gasket, and thus improve its performance. In the final stage, the gasket is solidified and formed by lowering the temperature. 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 improves the overall quality of the liquid metal heat dissipation gasket.

[0026] 2. The present invention applies an external magnetic field to generate Lorentz force on electrons and ions in liquid metal, thereby affecting the flow and solidification process of liquid metal. By precisely controlling the parameters of the intensity, direction and frequency of the magnetic field, precise regulation of the microstructure and performance of the liquid metal heat dissipation gasket is achieved. This regulation method not only improves the thermal conductivity of the gasket, but also makes it have a more uniform microstructure, thereby further improving the heat dissipation efficiency and stability of the gasket. The introduction of the magnetic field-assisted preparation method makes the preparation process of the liquid metal heat dissipation gasket more flexible and controllable, providing new ideas and methods for the preparation of high-performance heat dissipation gaskets.

[0027] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 The present invention is a flow chart of an efficient preparation method for a precisely temperature-controlled liquid metal heat sink pad. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 amount 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 completely remove impurities and moisture. Carbon fibers with a diameter of 7 microns and a length of 1.5 mm were prepared as reinforcing fibers with a total mass of 100 grams. The carbon fibers were soaked in a coupling agent for 45 minutes to improve their surface properties and facilitate subsequent combination with other materials. A high-temperature resistant silicone adhesive was selected, and its amount was 8% of the total mass of the liquid metal material and the reinforcing fiber, i.e. 80 grams, to ensure that the materials can be effectively bonded during the preparation process.

[0033] Magnetic field setting stage: An electromagnetic coil group is installed around the preparation equipment as a magnetic field generating device. The magnetic field generating device can adopt an electromagnetic coil group, which can accurately 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 adjusted between 10-100 Hz.

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

[0035] Initial stage (15 minutes): put the mixed materials into the heating equipment, start the heating program with a temperature of 60℃ and a heating rate of 1.5℃ / min, and start the magnetic field at the same time. Stir the materials at a speed of 25 rpm to heat the materials evenly and gradually remove the remaining moisture and volatile substances. The magnetic field strength is 0.1 Tesla, perpendicular to the heating equipment, to promote the uniform distribution of tiny particles in the material.

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

[0037] Final stage (20 minutes): First, cool rapidly to 125°C at a rate of 3.5°C / min, then slowly cool to 95°C (curing temperature) at a rate of 1.5°C / min. At the same time, weaken the magnetic field to 0.1 Tesla, and keep the direction of the magnetic field unchanged to solidify the gasket and ensure that the internal structure of the gasket is stable and uniform.

[0038] Molding process: After curing, allow the gasket to cool naturally for 1.5 hours to room temperature, and use laser cutting equipment to cut the gasket into a size suitable for high-performance computer cooling modules, such as 50 mm long, 40 mm wide, and 3 mm thick. Use sandpaper to finely polish the surface of the gasket to ensure that its surface is smooth and flat, meeting the precise size and shape requirements of high-performance computer cooling systems for cooling gaskets.

[0039] Quality inspection stage: The prepared liquid metal heat sink gaskets are subjected to comprehensive quality inspection, including appearance inspection to ensure that the surface is flawless and free of bubbles, and the dimensions are accurately measured to confirm that the length, width, and height errors are within the range of ±0.1 mm. Thermal conductivity tests are performed using a professional thermal conductivity tester. After testing, the thermal conductivity of the heat sink gaskets prepared under this comparative example is above 50W / (m·K). After testing, it was found that the thermal conductivity of a batch of gaskets was lower than that of the gaskets of this batch, so the gaskets of this batch were returned for re-preparation, and the process parameters were strictly controlled to ensure that the quality of the final product fully meets the high standards of high-performance computer cooling systems.

[0040] Comparative Example 2:

[0041] 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 amount of 900 grams. The alloy was 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 microns and a length of 1.5 mm were prepared as reinforcing fibers with a total mass of 100 grams. The carbon fibers were soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive was selected, and its amount was 8% of the total mass of the liquid metal material and the reinforcing fibers, i.e. 80 grams.

[0042] Magnetic field setting stage: An electromagnetic coil group is installed around the preparation equipment as a magnetic field generating device. The magnetic field generating device adopts an electromagnetic coil group, which can accurately 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): the mixed material is placed in a heating device, and a heating program with a temperature of 50°C (60°C in the comparative example) and a heating rate of 1.5°C / min is started. At the same time, a magnetic field is started, and the material is stirred at a speed of 25 rpm. The magnetic field strength is 0.1 Tesla, perpendicular to the heating device.

[0045] Intermediate stage (25 minutes): raise the temperature to 180°C, 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°.

[0046] The final stage (20 minutes): first quickly cool down to 125°C at a rate of 3.5°C / min, then slowly cool down to 95°C at a rate of 1.5°C / min, while weakening the magnetic field to 0.1 Tesla, and keeping the direction of the magnetic field unchanged.

[0047] Molding process: After curing, let the gasket cool naturally for 1.5 hours to room temperature, use laser cutting equipment to cut the gasket into a size suitable for high-performance computer cooling modules, and then use sandpaper to finely polish the gasket surface.

[0048] Quality inspection stage: The prepared liquid metal heat sink gasket is subjected to comprehensive quality inspection, including appearance inspection, dimension measurement (with the same accuracy requirements as in the embodiment), and thermal conductivity test. After testing, the thermal conductivity of the heat sink gasket prepared under this comparative example is approximately 42W / (m·K).

[0049] Comparative Example 3:

[0050] 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 amount of 900 grams. The alloy was 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 microns and a length of 1.5 mm were prepared as reinforcing fibers with a total mass of 100 grams. The carbon fibers were soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive was selected, and its amount was 8% of the total mass of the liquid metal material and the reinforcing fibers, i.e. 80 grams.

[0051] Magnetic field setting stage: An electromagnetic coil group is installed around the preparation equipment as a magnetic field generating device. The magnetic field generating device adopts an electromagnetic coil group, which can accurately 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): put the mixed materials into the heating device, start the heating program with a temperature of 60°C and a heating rate of 1.5°C / min, and start the magnetic field at the same time, stir the materials at a speed of 25 rpm, and the magnetic field strength is 0.1 Tesla, perpendicular to the heating device.

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

[0055] The final stage (20 minutes): first quickly cool down to 125°C at a rate of 3.5°C / min, then slowly cool down to 95°C at a rate of 1.5°C / min, while weakening the magnetic field to 0.1 Tesla, and keeping the direction of the magnetic field unchanged.

[0056] Molding process: After curing, let the gasket cool naturally for 1.5 hours to room temperature, use laser cutting equipment to cut the gasket into a size suitable for high-performance computer cooling modules, and then use sandpaper to finely polish the gasket surface.

[0057] Quality inspection stage: The prepared liquid metal heat sink pad is subjected to comprehensive quality inspection, including appearance inspection, dimension measurement, and thermal conductivity test. After testing, the thermal conductivity of the heat sink pad prepared under this comparative example is about 45W / (m·K).

[0058] Comparative Example 4

[0059] 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 amount of 900 grams. The alloy was 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 microns and a length of 1.5 mm were prepared as reinforcing fibers with a total mass of 100 grams. The carbon fibers were soaked in a coupling agent for 45 minutes. A high-temperature resistant silicone adhesive was selected, and its amount was 8% of the total mass of the liquid metal material and the reinforcing fibers, i.e. 80 grams.

[0060] Magnetic field setting stage: An electromagnetic coil group is installed around the preparation equipment as a magnetic field generating device. The magnetic field generating device adopts an electromagnetic coil group, which can accurately 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): put the mixed materials into the heating device, start the heating program with a temperature of 60°C and a heating rate of 1.5°C / min, and start the magnetic field at the same time, stir the materials at a speed of 25 rpm, and the magnetic field strength is 0.1 Tesla, perpendicular to the heating device.

[0063] Intermediate stage (25 minutes): raise the temperature to 180°C, 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°.

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

[0065] Molding process: After curing, let the gasket cool naturally for 1.5 hours to room temperature, use laser cutting equipment to cut the gasket into a size suitable for high-performance computer cooling modules, and then use sandpaper to finely polish the gasket surface.

[0066] Quality inspection stage: The prepared liquid metal heat sink pad is subjected to comprehensive quality inspection, including appearance inspection, dimension measurement (with the same accuracy requirements as in the embodiment), and thermal conductivity test. After testing, the thermal conductivity of the heat sink pad prepared under this comparative example is approximately 40 W / (m·K).

[0067] Through these four comparative examples, it can be seen that in the preparation process of liquid metal heat sink pads, temperature has a significant effect on thermal conductivity. If the temperature in the initial stage deviates from the appropriate range, it will affect the effect of the preliminary material processing, which is not conducive to the full progress of the subsequent reaction, resulting in a decrease in thermal conductivity; inappropriate temperature in the middle stage will hinder the full mixing and reaction of liquid metal with other materials, and fail to optimize the microstructure, resulting in less than optimal thermal conductivity; improper cooling rate in the final stage will cause abnormal internal structure of the gasket, resulting in stress problems, which will also reduce thermal conductivity. Therefore, precise control of temperature at each stage is crucial to obtain liquid metal heat sink pads with high thermal conductivity. The appropriate temperature system should be strictly followed during the preparation process to ensure the high performance of the heat sink pad.

[0068] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A highly efficient preparation method for a precise temperature-controlled liquid metal heat dissipation pad, characterized in that: The specific steps of the preparation method are: S100, material preparation: the liquid metal material is gallium-indium alloy, the reinforcing fiber is carbon fiber, and the adhesive is high-temperature resistant silicone adhesive. The liquid metal material, reinforcing fiber and adhesive are cleaned and dried separately to remove impurities and moisture; S200, magnetic field setting: an adjustable magnetic field generating device is set around the preparation equipment to accurately control the parameters of the intensity, direction and frequency of the magnetic field; S300, multi-stage heating and magnetic field assisted control: Initial stage: put the mixed materials into the heating equipment, turn on a weak magnetic field, use a temperature of 55℃-65℃, and a heating rate of 1.2℃ / min-1.8℃ / min to gradually preheat the materials and remove the remaining moisture and other volatile substances. The magnetic field strength is set to 0.1 Tesla, and the direction is perpendicular to the heating equipment. The tiny particles in the material are evenly distributed through the effect of the magnetic field. Intermediate stage: Raise the temperature to the reaction temperature of 170℃-190℃, the heating rate can be adjusted between 5℃ / min-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, promotes the full mixing and reaction of the liquid metal with other materials, and optimizes the microstructure. The final stage: adopt the segmented cooling method, first cool down to 120℃-130℃ at a faster cooling rate of 3℃ / min-4℃ / min, then cool down to the curing temperature at a slower cooling rate of 1.2℃ / min-1.8℃ / min, and at the same time weaken the magnetic field to between 0.08-0.12 Tesla to solidify the gasket; S400, molding treatment: After curing and molding, the gasket is cooled to room temperature, and the cooled gasket is laser cut and sanded to meet the required size and shape requirements; S500, quality inspection: Perform quality inspection on the prepared liquid metal heat sink gasket, including appearance inspection, dimension measurement, and thermal conductivity test. For unqualified gaskets, rework will be carried out.

2. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation pad according to claim 1, characterized in that: In the S100, the gallium content of the liquid metal material in the material preparation is 70%-80%, and the indium content is 20%-30%. The pretreatment adopts a combination of ultrasonic cleaning and vacuum drying. The cleaning time is 10-15 minutes, the vacuum drying temperature is 55°C-65°C, and the time is 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 has a diameter of 5-10 micrometers and a length of 1-2 millimeters, and the surface 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 the S100, the amount of the organic silicon adhesive in the material preparation is 5%-10% of the total mass of the liquid metal material and the 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 the 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 adjusted 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: In the S300, the duration of the initial stage in the multi-stage heating and magnetic field assisted control is 10-20 minutes. In the initial stage, stirring operation can be added, and the stirring speed is 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 duration of the middle stage in the multi-stage heating and magnetic field assisted control is 20-30 minutes, and the angle between the magnetic field direction and the heating direction can be adjusted as needed, and the angle range is 30°-60°.

8. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation gasket according to claim 1, characterized in that: The duration of the last stage of the multi-stage heating and magnetic field assisted control in S300 is 15-25 minutes, and the magnetic field angle does not need to be changed.

9. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation gasket 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° C.-110° C., and the curing time is 15-25 minutes.

10. The method for efficiently preparing a precise temperature-controlled liquid metal heat dissipation gasket according to claim 1, characterized in that: In the step S400, cooling during the molding process is performed by natural cooling for 1 to 2 hours.

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