Method for regulating and controlling liquidity of liquid metal in cooling process

Abstract

The invention aims to disclose a method for regulating and controlling liquidity of liquid metal in the cooling process, a container containing the liquid metal is cooled through at least one cooling mode or a combination of several cooling modes, the temperature of the liquid metal is controlled to be 25-65 DEG C under the action of heat transfer, the liquidity of the liquid metal is changed, and the liquidity of the liquid metal is regulated and controlled. The liquidity of the liquid metal is regulated and controlled, and subsequent infiltration of the liquid metal and adjustment of continuous thickness are facilitated; compared with the prior art, through at least one cooling mode or a combination of several cooling modes, full-coverage infiltration and continuous thickness-adjustable infiltration modes of the liquid metal on the surface of the solid-phase carrier are achieved, and the purpose of the invention is achieved.

Description

Technical Field

[0001] The invention relates to a method for regulating the fluidity of liquid metal, and in particular to a method for regulating the fluidity of liquid metal in a cooling process for liquid metal flow attachment molding in a cooling process. Background Art

[0002] In the prior art, metals with a melting point of 30 to 200° C. are also called liquid metals. Liquid metals are easily converted into a fluid form after being heated and are widely used in ion emission systems.

[0003] However, the fluidity of liquid metal is affected by many factors, and it is very easy for the poor continuity of its own fluid flow to lead to large differences in the adhesion molding effect, which is not conducive to stability at the application processing end.

[0004] The cooling process is crucial to the fluidity and adhesion molding behavior of the heated liquid metal. The choice of cooling technology and the change of process parameters have a great influence on the final adhesion molding of the liquid metal on the solid carrier.

[0005] Therefore, a method for regulating the fluidity of liquid metal during the cooling process is particularly needed to solve the above-mentioned existing problems. Summary of the invention

[0006] The purpose of the present invention is to provide a method for regulating the fluidity of liquid metal during a cooling process, to address the deficiencies of the prior art, to effectively achieve directional fluidity regulation of liquid metal, and ultimately to achieve adhesion molding of liquid metal on the surface of a solid carrier.

[0007] The technical problem solved by the present invention can be achieved by adopting the following technical solutions: A method for regulating the fluidity of liquid metal during a cooling process, comprising the following steps: The container loaded with liquid metal is cooled by at least one cooling method or a combination of several cooling methods. Under the action of heat transfer, the temperature of the liquid metal is controlled at 25-65°C, the fluidity of the liquid metal is changed, and the fluidity of the liquid metal is regulated, which is convenient for the subsequent infiltration of the liquid metal and the adjustment of the continuous thickness.

[0008] In one embodiment of the present invention, the cooling method includes air cooling, specifically using nitrogen as an air cooling carrier, controlling the flow rate of the nitrogen, and increasing the heat dissipation rate by directly contacting the nitrogen with the bottom and sides of the container carrying the liquid metal in a closed space.

[0009] Furthermore, the flow rate of the nitrogen is 10-12 L / min.

[0010] In one embodiment of the present invention, the cooling method includes circulating water cooling, specifically, the circulating water flow is contacted with the container loaded with liquid metal, and the circulating water flow is realized by a stirring device to achieve continuous heat dissipation of the liquid metal; the circulating water flow is replaced through a drain port and a water supply port at a temperature close to the liquid metal at ±5°C.

[0011] In one embodiment of the present invention, the cooling method includes cooling with a phase change material, specifically, coating the phase change material on dust-free paper. When cooling, the dust-free paper coated with the phase change material covers the bottom and sides of the container carrying the liquid metal. The amount of the phase change material used is about 0.8-2.1 g / dm 3 .

[0012] Furthermore, the phase change material is a mixture of PVA and PEG prepared by freeze-drying, the mass ratio of PVA to PEG in the mixture of PVA and PEG is 3-4:1; the mass percentage of PVA to PEG in the mixture of PVA and PEG is 5-12wt%.

[0013] Furthermore, the mixing method of PVA and PEG is as follows: weigh a certain amount of PVA and dissolve it in deionized water, and mechanically stir it at 80-95°C until it is completely dissolved; then add a certain amount of PEG 4000, let it stand to degas after it is fully dissolved, and then pour the solution into a stainless steel mold, freeze it at -20 to -10°C for 4-6h, and thaw it at 0-6°C for 2-4h, with freezing to thawing as a cycle. After 4 cycles, freeze-dry it to obtain a PEG and PVA composite phase change material.

[0014] Compared with the prior art, the method of lowering temperature to regulate the fluidity of liquid metal in the present invention realizes full coverage infiltration of liquid metal on the surface of solid carrier and continuous thickness adjustable infiltration mode through at least one cooling method or a combination of several cooling methods, thereby achieving the purpose of the present invention.

[0015] The features of the present invention can be clearly understood by referring to the drawings and the following detailed description of the preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the air cooling + phase change material cooling process of the present invention; Figure 2 It is a schematic diagram of the water cooling + phase change material cooling process of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0018] The method for regulating the fluidity of liquid metal during the cooling process of the present invention comprises the following steps: The container loaded with liquid metal is cooled by at least one cooling method or a combination of several cooling methods. Under the action of heat transfer, the temperature of the liquid metal is controlled at 25-65°C, the fluidity of the liquid metal is changed, and the fluidity of the liquid metal is regulated, which is convenient for the subsequent infiltration of the liquid metal and the adjustment of the continuous thickness.

[0019] The cooling method includes air cooling, which specifically uses nitrogen as an air cooling carrier, controls the flow rate of the nitrogen, and directly contacts the bottom and sides of the container carrying the liquid metal in a closed space to increase the heat dissipation rate. The flow rate of the nitrogen is 10-12 L / min.

[0020] The cooling method includes circulating water cooling, which is specifically to contact the circulating water flow with the container loaded with liquid metal, and the circulating water flow is realized by a stirring device to achieve continuous heat dissipation of the liquid metal; the circulating water flow is replaced through the drain port and the water supply port at a temperature close to the liquid metal at ±5°C.

[0021] The cooling method includes cooling with phase change materials. Specifically, the phase change material is coated on dust-free paper. When cooling, the dust-free paper coated with the phase change material covers the bottom and sides of the container carrying the liquid metal. The amount of phase change material used is about 0.8-2.1 g / dm 3 .

[0022] The phase change material is a mixture of PVA and PEG prepared by freeze-drying, wherein the mass ratio of PVA to PEG in the mixture of PVA and PEG is 3-4:1; and the mass percentage of PVA to PEG in the mixture of PVA and PEG is 5-12wt%.

[0023] The mixing method of PVA and PEG is as follows: weigh a certain amount of PVA and dissolve it in deionized water, and mechanically stir it at 80-95°C until it is completely dissolved; then add a certain amount of PEG 4000, stand it for degassing after it is fully dissolved, and then pour the solution into a stainless steel mold, freeze it at -20 to -10°C for 4-6h, and thaw it at 0-6°C for 2-4h, with freezing to thawing as a cycle, and after 4 cycles, freeze-dry it to obtain a PEG and PVA composite phase change material. Example 1

[0024] In this embodiment, the container containing the liquid metal is cooled by combining air cooling and phase change material cooling methods to achieve liquid metal fluidity control, including the following steps: The liquid metal is stored in a regular cylindrical stainless steel container. The bottom and sides of the stainless steel container are wrapped with dust-free paper, and the dust-free paper is coated with phase change material. The amount of phase change material used is about 1g / dm3 The stainless steel container is fixed on the hollow bracket, and the surrounding environment is a closed cavity. Nitrogen can be transported at the bottom and sides of the cavity, and the flow rate is controllable.

[0025] First, the nitrogen flow rate was 13-15 L / min, and the air cooling time was 10 min. Then the nitrogen flow rate was adjusted to 10-12 L / min, and the duration was 15 min.

[0026] The phase change material is a mixture of PVA and PEG, the mass ratio of the mixture is 3:1, and the mass percentage of the mixed solution is 8 wt%. The mixing method of the PEG and PVA composite phase change material is as follows: PVA is dissolved in deionized water and mechanically stirred at 90°C until completely dissolved; then a certain amount of PEG 4000 is added, and after being fully dissolved, it is allowed to stand and degas, and then the solution is poured into a stainless steel mold, frozen at -18°C for 6 hours, and thawed at 4°C for 3 hours. This freezing-thawing cycle is a cycle, and after 4 cycles, freeze-drying is performed. Example 2

[0027] The cooling method of this embodiment is the same as that of embodiment 1; The difference is: In terms of air cooling and nitrogen flow rate: first, the nitrogen flow rate is 18-20 L / min, the air cooling time is 10 minutes, and then the nitrogen flow rate is adjusted to 16-18 L / min, and the duration is 15 minutes. In terms of phase change material cooling: the mass ratio of the mixture of PVA and PEG is 4:1. Example 3

[0028] In this embodiment, the container containing the liquid metal is cooled by a combination of water cooling and phase change material cooling methods to achieve liquid metal fluidity control, including the following steps: The liquid metal is stored in a regular cylindrical stainless steel container. The side of the stainless steel container is wrapped with dust-free paper, and the dust-free paper is coated with phase change material. The amount of phase change material used is about 1g / dm 3 The phase change material is prepared and formulated with a stainless steel container fixed on a hollow bracket, the lower end of the container is in direct contact with circulating water, and when the circulating water flow is close to the temperature of the liquid metal (±5°C), it is dynamically replaced through the drain port and the water supply port.

[0029] The effects of the present invention and the prior art are compared as follows: Example Infiltration method Liquidity Adhesion effect Example 1 Medium flow air cooling + phase change material cooling Non-diffusion flow Uniform cover thickness Example 2 High flow air cooling + phase change material cooling Non-diffusion flow Uniform cover thickness Example 3 Circulating water cooling + phase change material cooling Non-diffusion flow Uniform cover thickness Prior art Natural cooling in room temperature / low temperature environment There is a tendency for diffusion flow Large thickness deviation The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A method for regulating the fluidity of liquid metal during a cooling process, characterized in that: The steps include: The container loaded with liquid metal is cooled by at least one cooling method or a combination of several cooling methods. Under the action of heat transfer, the temperature of the liquid metal is controlled at 25-65°C, the fluidity of the liquid metal is changed, and the fluidity of the liquid metal is regulated, which is convenient for the subsequent infiltration of the liquid metal and the adjustment of the continuous thickness.

2. The method for controlling the fluidity of liquid metal during the cooling process according to claim 1, characterized in that: The cooling method includes air cooling, and the specific method is to use nitrogen as an air cooling carrier, control the flow rate of the nitrogen, and increase the heat dissipation rate by directly contacting the nitrogen with the bottom and sides of the container carrying the liquid metal in a closed space.

3. The method for controlling the fluidity of liquid metal during the cooling process according to claim 2, characterized in that: The flow rate of the nitrogen gas is 10-12 L / min.

4. The method for controlling the fluidity of liquid metal during the cooling process according to claim 1, characterized in that: The cooling method includes circulating water cooling, which is specifically to contact the circulating water flow with the container loaded with liquid metal, and the circulating water flow is realized by a stirring device to achieve continuous heat dissipation of the liquid metal; the circulating water flow is replaced through the drain port and the water supply port at a temperature close to the liquid metal at ±5°C.

5. The method for controlling the fluidity of liquid metal during the cooling process according to claim 1, characterized in that: The cooling method includes cooling with phase change materials. Specifically, the phase change material is coated on dust-free paper. When cooling, the dust-free paper coated with the phase change material covers the bottom and sides of the container carrying the liquid metal. The amount of phase change material used is about 0.8-2.1 g / dm 3 .

6. The method for controlling the fluidity of liquid metal during the cooling process according to claim 5, characterized in that: The phase change material is a mixture of PVA and PEG prepared by freeze-drying, wherein the mass ratio of PVA to PEG in the mixture of PVA and PEG is 3-4:1; and the mass percentage of PVA to PEG in the mixture of PVA and PEG is 5-12wt%.

7. The method for controlling the fluidity of liquid metal during the cooling process according to claim 6, characterized in that: The mixing method of PVA and PEG is as follows: weigh a certain amount of PVA and dissolve it in deionized water, and mechanically stir it at 80-95°C until it is completely dissolved; then add a certain amount of PEG 4000, stand it for degassing after it is fully dissolved, and then pour the solution into a stainless steel mold, freeze it at -20 to -10°C for 4-6h, and thaw it at 0-6°C for 2-4h, with freezing to thawing as a cycle, and after 4 cycles, freeze-dry it to obtain a PEG and PVA composite phase change material.

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