CN113390280B - Porous special-shaped composite liquid absorption core micro heat pipe and preparation method thereof - Google Patents
Porous special-shaped composite liquid absorption core micro heat pipe and preparation method thereof Download PDFInfo
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- CN113390280B CN113390280B CN202110536819.XA CN202110536819A CN113390280B CN 113390280 B CN113390280 B CN 113390280B CN 202110536819 A CN202110536819 A CN 202110536819A CN 113390280 B CN113390280 B CN 113390280B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
Abstract
The invention discloses a porous special-shaped composite liquid absorption core micro heat pipe and a preparation method thereof. The sintering copper powder part evaporation section adopts macropores, the condensation section adopts micropores, and the size of the pores of the heat insulation section is between the macropores and the macropores. The great hole of evaporation zone can reduce the obstructed risk of bubble, promotes the speed that the bubble breaks away from by a wide margin, and the less hole of condensation zone makes the capillary effect of condensing strengthen for condensing of cold junction gas. The multi-directional pore structure of the sintered copper powder provides more space for gas to escape from the evaporation section and enter the condensation section, and the transverse pore structure of the copper capillary tube provides strong capillary force for liquid backflow. The boiling heated area and the condensation cooled area can be increased by the area of the hot end and the cold end of the large liquid absorption core, the narrow design of the heat insulation section can provide a large channel for the air flow, the rapid circulation of the air flow is guaranteed, and the heat transfer is integrally accelerated.
Description
Technical Field
The invention relates to the field of micro heat pipes, in particular to a porous special-shaped composite liquid absorption core micro heat pipe and a preparation method thereof.
Background
With the rapid development of micro devices, the integration of electronic chips is rapidly improved, and the heat flux formed per unit area is rapidly increased, and the high heat flux has become an important factor affecting the life of the electronic chip. The narrowing of the product space makes the heat dissipation become a huge challenge, the traditional heat dissipation mode is difficult to meet the requirement, and the micro heat pipe technology with strong phase change heat transfer capacity is rapidly developed. The micro heat pipe is one of the most efficient heat dissipation schemes at present due to its advantages of high thermal conductivity, high reliability, and no need of external driving.
The micro heat pipe completes heat conduction by means of gas-liquid phase change of internal working media, can realize heat transfer by micro temperature drop, takes away heat of components and parts by continuous liquid-gas-liquid circulation change inside, ensures stable and efficient operation of the heat pipe, and has to make efficient circulation of gas and liquid inside the heat pipe, wherein a large airflow channel and strong liquid backflow capacity are key factors influencing the performance of the heat pipe, and the improvement of the liquid suction core is an important technical means for optimizing the key factors.
The common flat micro heat pipes at present are of a groove type, a sintering type and a wire mesh type. Although the groove-type wick structure has the advantages of light weight and small liquid backflow resistance, the capillary pressure is low, the capacity of driving liquid in a condensation section to flow back is low, and the evaporation section can enter the boiling limit too early.
Traditional sintered wick and silk screen type wick, its whole pore distribution all is evenly distributed, when whole hole is less, liquid backflow resistance is big, evaporation zone bubble escape difficulty, the great resistance of liquid backward flow, make evaporation zone liquid can not in time supply, can just get into the boiling limit when power is lower, when whole hole is great, can lead to capillary pressure not enough, the liquid backward flow is slow, and condensation zone liquid condensation efficiency weakens, lead to the decline of heat pipe wholeness ability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a porous special-shaped composite liquid absorption core micro heat pipe and a preparation method thereof.
According to the invention, the risk of bubble blockage can be reduced by utilizing the larger pores of the evaporation section, the bubble separation speed is greatly increased, the capillary condensation effect is enhanced by utilizing the smaller pores of the condensation section, and the condensation of cold-end gas is accelerated. The multi-directional pore structure of the sintered copper powder provides more space for gas to escape from the evaporation section and enter the condensation section, and the transverse pore structure of the copper capillary tube provides strong capillary force for liquid backflow. The large areas of the hot end and the cold end of the liquid absorption core can increase the boiling heating area and the condensation cooling area, the narrow design of the heat insulation section can provide a large channel for airflow, the rapid circulation of the airflow is guaranteed, the heat transfer is integrally accelerated, and the technical problems of small airflow channel, small capillary pressure, low permeability, slow evaporation and condensation and low heat transfer capacity of the existing liquid absorption core micro heat pipe are solved.
In order to solve the technical problem, the invention is realized by using the following technical scheme: the composite liquid absorption core is sequentially divided into an evaporation section, a heat insulation section and a condensation section, wherein the heat insulation section is rectangular, the width of the evaporation section is gradually decreased from an evaporation end to the heat insulation section in an arc shape, the width of the condensation section is gradually increased from the heat insulation section to the condensation end in an arc shape, the area ratio of the heat insulation section is small, and the area ratio of the evaporation section to the condensation section is large.
Preferably, the composite liquid absorption core structure is formed by compositely sintering copper powder and a copper capillary tube and is sintered with the copper base tube together, and the composite liquid absorption core is sintered for multiple times in a segmented mode; the composite liquid absorbing core adopts various pore structures, the copper capillary part is of a pore structure in the transverse direction, and the contact part of the copper capillary and the copper powder is of a multi-direction pore structure.
Preferably, the evaporation section, the heat insulation section and the condensation section of the sintered copper powder part are all of a multidirectional pore structure, the diameter of the copper powder used by the evaporation section of the sintered copper powder part of the composite liquid absorption core is 130-150 microns, the diameter of the copper powder used by the condensation section is 70-90 microns, and the diameter of the copper powder used by the heat insulation section is 100-120 microns.
Preferably, the evaporation section length accounts for 20-30% of the length of the micro heat pipe, the heat insulation section length accounts for 40-60% of the length of the micro heat pipe, and the condensation section length accounts for 20-30% of the length of the micro heat pipe.
Preferably, the heat-insulating section wick occupies 40-50% of the area of the heat-insulating section, the evaporation section wick occupies 50-60% of the area of the evaporation section, and the condensation section wick occupies 50-60% of the area of the condensation section.
Preferably, the composite liquid absorption core is a copper powder-copper capillary tube-copper powder composite, and the copper capillary tubes are arranged in a single layer or multiple layers.
Preferably, the composite wick is subjected to hydrophilic treatment, and the wick is subjected to corrosion treatment by using a mixed solution of FeCl3 and HCl.
Preferably, the composite liquid absorption core is parallel to the copper-based pipe and is placed in the middle, and two ends of the liquid absorption core are connected with two ends of the copper-based pipe in a sintering mode.
On the other hand, the invention also provides a preparation method of the porous special-shaped composite liquid absorption core micro heat pipe, which comprises the following steps:
s1, placing a copper capillary tube and copper powder in ethanol for ultrasonic cleaning, and then washing the copper capillary tube and the copper powder clean by deionized water;
s2, putting the cleaned copper capillary tube and copper powder into a drying box, drying and taking out the copper capillary tube and the copper powder, firstly laying a layer of copper powder in a graphite mould, then laying the copper capillary tube on the copper powder according to the shape required by a liquid absorption core, then putting the copper capillary tube into a sintering furnace, sintering the copper capillary tube in hydrogen atmosphere, cooling, taking out, cleaning and drying the copper capillary tube after the completion of the sintering, then sintering the large pore part of an evaporation section, taking out, cleaning and drying the copper capillary tube after the completion of the sintering, then placing a copper powder sintering heat insulation section, taking out, cleaning and drying the copper powder, and then placing a copper powder sintering condensation section;
s3, taking out the cooled wick structure, putting the wick structure into ethanol for ultrasonic cleaning, then washing the wick structure with deionized water, and putting the wick structure into a drying oven for drying;
s4, cutting a red copper round pipe with a proper length by using a cutting machine, necking one end of the red copper round pipe, then placing the red copper round pipe into ethanol for ultrasonic cleaning, then washing the red copper round pipe clean by using deionized water, and placing the red copper round pipe into a drying box for drying;
s5, placing the cleaned copper pipe under a hot press to be pressed into a copper-based pipe with the required thickness, then placing the liquid absorption core structure in the copper-based pipe, pressing by using the hot press, then placing the copper-based pipe into a sintering furnace, sintering and molding in a hydrogen atmosphere, and sealing one end of the non-reduced opening after cooling;
s6, injecting a mixed solution of FeCl3 and HCl from one end of a reducing port, placing the heat pipe in an ultrasonic cleaning machine to vibrate, pouring out the solution after uniform corrosion for a few minutes, then injecting deionized water to carry out repeated ultrasonic cleaning, and drying after cleaning;
s7, injecting deionized water from one end of the necking, placing the other end of the necking into warm water, then carrying out vacuum pumping treatment, cutting off redundant necking by cold welding, and sealing to obtain the micro heat pipe.
The porous special-shaped composite liquid absorption core micro heat pipe provided by the invention has abundant micro-scale surface structures on the surfaces of copper powder and copper capillary tubes which are subjected to chemical corrosion, and the copper powder and copper capillary tubes which are sintered at high temperature are metallurgically bonded with copper base pipes, so that the porous special-shaped composite liquid absorption core micro heat pipe has a sufficient pore structure. The manufactured special-shaped composite liquid absorption core has the advantages of simple process, low cost, large capillary pressure, high permeability, fast evaporation of liquid in an evaporation section, fast condensation of gas in a condensation section, large airflow channel and good overall heat transfer performance of the heat pipe.
Compared with the prior art, the invention has the beneficial effects that: the width of the evaporation section of the composite liquid absorption core designed in the invention is gradually decreased from the evaporation end to the heat insulation section in an arc shape, the width of the liquid absorption core at the condensation section is gradually increased from the heat insulation section to the condensation end in an arc shape, and the special-shaped structure enables the evaporation section and the condensation section to form larger evaporation and condensation areas on one hand, and enables an airflow channel to be enlarged due to the narrower design of the heat insulation section part in the middle of the liquid absorption core on the other hand, and the gas-liquid circulation speed is increased.
The composite liquid absorption core designed by the invention has two directional type pore structures which are respectively a multidirectional pore of the sintered copper powder and a unidirectional pore of the copper capillary, the horizontal pore of the copper capillary provides strong capillary force for the liquid absorption core, the multidirectional pore of the sintered copper powder provides more ascending and left and right escaping airflow channels for the evaporation section, and the multidirectional pore can also provide more directional air inlet channels for the condensation section, so that the gas-liquid circulation is integrally accelerated, and the performance of the heat pipe is improved.
The composite liquid absorption core sintered copper powder part designed by the invention adopts three pores, on the premise of ensuring that the pores can provide enough capillary pressure for the heat pipe, the larger pore of the evaporation section can provide more favorable conditions for boiling bubbles to be separated, and the smaller pore of the condensation section enables the capillary condensation effect of the condensation section to be enhanced and promotes the gas to be liquefied and condensed more quickly, thereby integrally improving the performance of the micro heat pipe.
The invention adopts a chemical corrosion method to form a large number of micro-scale surface structures on copper powder and copper capillary tubes, improves the hydrophilic capability of the surface of the liquid absorption core, further strengthens the liquid reflux capability, and further improves the heat dissipation performance of the micro heat pipe.
Drawings
FIG. 1 is a schematic view of a microthermal tube structure according to the present invention;
FIG. 2 is a schematic view of the placement of the shaped composite wick according to the present invention;
FIG. 3 is a top view of the shaped composite wick according to the present invention;
FIG. 4 is a schematic cross-sectional view of a shaped composite wick according to the present invention;
FIG. 5 is a schematic longitudinal cross-sectional view of a shaped composite wick according to the present invention;
FIG. 6 is a contact angle real-time tap of the profiled composite wick of the present invention without hydrophilic treatment;
FIG. 7 is a contact angle real beat graph after hydrophilic treatment of the profiled composite wick of the present invention;
the labels in the figure are: 1-composite liquid absorption core, 2-copper base tube, 3-evaporation section, 4-heat insulation section, 5-condensation section, 6-copper powder and 7-copper capillary tube.
Detailed Description
The following further describes the embodiments of the present invention, but the present invention is not limited to the following embodiments.
Example 1
As shown in fig. 1-5, the porous irregular composite wick micro heat pipe provided by the present embodiment includes a copper substrate pipe 2, a wick 1 and a liquid working medium filled in the wick, a copper capillary 7 and copper powder 6 are compositely sintered to form the composite wick 1, the composite wick 1 is a copper powder 6-copper capillary 7-copper powder 6 composite, and the arrangement of the copper capillary 7 can be a single layer or multiple layers. The composite liquid absorption core 1 is parallel to the copper-based pipe 2 and placed in the center, two ends of the liquid absorption core are connected with two ends of the copper-based pipe in a sintering mode, two ends of the copper-based pipe 2 are of a closed structure, the interior of the copper-based pipe is vacuumized, and the liquid absorption core is subjected to hydrophilic treatment and is tightly bonded with the copper-based pipe in a sintering mode.
The diameter of the sintered copper powder of the composite liquid absorption core 1 is divided into three types, the diameter of the copper powder in the evaporation section 3 is 140 micrometers, the diameter of the copper powder in the heat insulation section 4 is 110 micrometers, and the diameter of the copper powder in the condensation section 5 is 80 micrometers; on the premise of ensuring that the pores can provide enough capillary pressure for the heat pipe, the larger pores of the evaporation section can provide more favorable conditions for separation of boiling bubbles, and the smaller pores of the condensation section enable the capillary condensation effect of the condensation section to be enhanced and promote the gas to be liquefied and condensed more quickly, so that the performance of the micro heat pipe is integrally improved.
The width of the evaporation section 3 of the composite liquid absorption core is gradually decreased from the evaporation end to the heat insulation section 4 in an arc shape, and the width of the liquid absorption core of the condensation section 5 is gradually increased from the heat insulation section to the condensation end 4 in an arc shape. The special-shaped structure enables the evaporation section and the condensation section to form larger evaporation and condensation areas on one hand, and the narrower design of the middle heat insulation section of the liquid absorption core enables the airflow channel to be enlarged on the other hand, so that the gas-liquid circulation speed is increased.
The copper capillary 7 is in a transverse pore structure, the contact part of the copper capillary 7 and the copper powder 6 is in a multidirectional pore structure, and the copper powder is in a multidirectional pore structure. The horizontal pores of the copper capillary tube provide strong capillary force for the liquid absorbing core, the multi-directional pores of the sintered copper powder provide more ascending and left and right escaping airflow channels for the evaporation section, and the multi-directional pores can also provide more upward air inlet channels for the condensation section, so that the gas-liquid circulation is integrally accelerated, and the performance of the heat pipe is improved.
The evaporation section has a length of about 1/4 a, the adiabatic section has a length of about 1/2 a, and the condenser section has a length of about 1/4 a. The heat pipe conducts heat by means of gas-liquid phase change, heated parts and cooled parts need to be stored in the heat pipe, the heat transfer effect is the best under the condition that the lengths of the two parts are equal, the middle heat insulation part is required for gas-liquid transmission, and the heat pipe is not limited to 1/4, and 1/4-1/3.
The area of the heat-insulating section occupied by the liquid absorbing cores is about 2/5, the area of the evaporation section occupied by the liquid absorbing cores is about 1/2, and the area of the condensation section occupied by the liquid absorbing cores is about 1/2. The evaporation section area design is that the area of both ends which are heated and cooled is large, but the area is too large to influence the gas flow, and 1/2 is the maximum area which can be reached by the evaporation section wick under the condition that a sufficient amount of gas channels are reserved.
Example 2
An embodiment of a method for manufacturing a porous profiled composite wick micro heat pipe according to an embodiment of the present invention will be described in detail below.
(1) Manufacturing a copper base tube: the method comprises the steps of cutting a hollow copper pipe into a required length by using a cutting machine, wherein the cutting length is 75mm, then performing pipe reducing treatment on one end of the hollow copper pipe, wherein the reducing length is 14mm, then putting the cut copper pipe into an ethanol solution for ultrasonic cleaning, washing off residual oil stains on the surface, then washing the copper pipe clean by using deionized water, putting the washed copper pipe into a mould with a required shape, pressing the copper pipe by using a hot press, and pressing the copper pipe to be 2.1mm thick.
(2) Manufacturing a liquid absorption core: customizing a graphite mold according to the design of a liquid absorption core, laying a layer of copper powder in the graphite mold, laying a capillary on the copper powder, wherein the layer of the capillary laid in the embodiment is 1, then placing the laid mold into a furnace with atmosphere protection for high-temperature sintering, heating the furnace in a sintering process in a segmented mode, wherein the protective atmosphere is nitrogen and hydrogen, the sintering temperature is 600-950 ℃, the sintering time is 120-240 min, and taking out the mold after waiting for the sintering furnace to cool to room temperature after sintering. Copper powder is laid on the evaporation section of the sintered capillary tube according to the requirement of the aperture, the copper powder is blocked by a partition plate, then the sintering step is repeated, the partition plate is removed after the sintering is finished, and the heat insulation section and the condensation section are sintered in the same way. After sintering, the copper powder and the copper capillary are bonded together through intermolecular diffusion, so that the porous composite liquid absorption core is obtained, and in addition, the integral contact thermal resistance of the sintered liquid absorption core can be greatly reduced. And putting the sintered wick into an ultrasonic cleaning machine, ultrasonically cleaning for 10 minutes by using ethanol, then putting the wick into deionized water, ultrasonically cleaning for 10 minutes, taking out the wick, and then putting the wick into a drying oven for drying.
(3) Assembling: and (3) placing the sintered wick into the pressed copper base pipe, placing the copper base pipe in the position shown in figure 3, placing the copper base pipe in which the wick is placed into a mould, pressing the mould again at a proper pressure to enable the wick and the copper base pipe to be tightly attached, placing the copper base pipe into a sintering furnace after pressing is completed, cooling the copper base pipe to room temperature after sintering is completed, taking the copper base pipe out, and bonding the wick and the copper base pipe together by high-temperature sintering to ensure that lower contact thermal resistance is obtained.
(4) Hydrophilic treatment of a liquid absorption core: the copper foam structure sintered from copper powder has insufficient hydrophilicity, and the contact angle is shown in FIG. 6, and the hydrophilic part is formed on the absorbent coreI.e. injecting a certain amount of FeCl from one end of the reducing port3Mixed with HCl, the solution used in this example was FeCl3: HCl: the ratio of water to water is 3:10:100, then the heat pipe is placed in an ultrasonic cleaning machine to be vibrated, the solution is poured out after being uniformly corroded for 7 minutes, then deionized water is injected for repeated ultrasonic cleaning, and drying treatment is carried out after cleaning is finished, wherein the process of water intrusion on the surface of the sintered copper powder after hydrophilic treatment in the embodiment is shown in fig. 7. Fig. 6 is a contact angle real-time image of the profiled composite wick without hydrophilic treatment. While fig. 6 shows a particularly large contact angle without hydrophilic treatment, while fig. 7 shows the contact angle as water contact progresses after hydrophilic treatment, the third of fig. 7 shows that the contact angle is almost 0, and it is concluded that the hydrophilicity is greatly enhanced by the two contact angles.
(5) Packaging: welding and sealing one end which is not subjected to necking treatment, vacuumizing the heat pipe from one end of the necking, filling a required amount of liquid working medium into the base pipe from one end of the necking after vacuumizing, welding and sealing the necking after the filling of the working medium is finished, putting one end of the heat pipe which is not subjected to necking treatment into hot water to heat the end of the heat pipe, heating the end to enable non-condensable gas in the base pipe to reach the necking, and cutting off the end at the joint of the necking and the base pipe by cold welding and sealing at the same time after a certain time. After secondary exhaust, the non-condensable gas in the base pipe can be greatly reduced.
By the manufacturing method, the porous special-shaped composite liquid absorption core micro heat pipe can be manufactured, and the manufactured micro heat pipe is large in evaporation area, large in condensation area and large in airflow channel. Compared with the traditional liquid absorption core, the liquid absorption core has better evaporation and condensation performance and higher gas flowing speed, and can greatly improve the performance of the heat pipe. The manufactured porous special-shaped composite liquid absorption core micro heat pipe has the advantages that the permeability, the capillary force and the like can be well met, the liquid backflow resistance is small, the evaporation bubbles in the evaporation section can be better separated through the sintered large pores, the liquid can be better condensed through the small pores in the condensation section, the excellent heat transfer performance is possessed, the structure is stable, the manufacturing process is simple, and the cost is low.
The above-described embodiment is only one example of the present invention, and the implementation manner of the present invention is not limited by the above-described embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The multi-aperture special-shaped composite liquid absorption core micro heat pipe comprises a copper base pipe, a composite liquid absorption core and a liquid working medium filled in the copper base pipe, and is characterized in that the composite liquid absorption core is sequentially divided into an evaporation section, a heat insulation section and a condensation section, wherein the heat insulation section is rectangular, the width of the evaporation section is gradually decreased from an evaporation end to the heat insulation section in an arc shape, the width of the condensation section is gradually increased from the heat insulation section to the condensation end in an arc shape, the area ratio of the heat insulation section is small, and the area ratio of the evaporation section to the condensation section is large.
2. The porous specially-shaped composite wick micro heat pipe according to claim 1, wherein the composite wick structure is formed by compositely sintering two parts, namely copper powder and a copper capillary, and sintering the two parts together with the copper-based pipe, and the composite wick sintering process adopts segmented multiple sintering; the composite liquid absorbing core is of a multi-pore structure, the copper capillary part is of a pore structure in the transverse direction, and the contact part of the copper capillary and the copper powder is of a multi-direction pore structure.
3. The micro heat pipe with the porous special-shaped composite liquid absorption core as claimed in claim 2, wherein the evaporation section, the heat insulation section and the condensation section of the sintered copper powder part are all of a multidirectional pore structure, the diameter of the copper powder used for the evaporation section of the sintered copper powder part of the composite liquid absorption core is 130-150 microns, the diameter of the copper powder used for the condensation section is 70-90 microns, and the diameter of the copper powder used for the heat insulation section is 100-120 microns.
4. The porous profiled composite wick micro-heat pipe of claim 1, wherein the evaporation section is 20% to 30% of the length of the micro-heat pipe, the insulation section is 40% to 60% of the length of the micro-heat pipe, and the condensation section is 20% to 30% of the length of the micro-heat pipe.
5. The porous profiled composite wick micro-heat pipe of claim 1, wherein the thermal insulation section wick occupies 40-50% of the area of the thermal insulation section, the evaporation section wick occupies 50-60% of the area of the evaporation section, and the condensation section wick occupies 50-60% of the area of the condensation section.
6. The porous profiled composite wick micro heat pipe of claim 1, wherein the composite wick is a copper powder-copper capillary-copper powder composite, the copper capillaries being arranged in a single layer or multiple layers.
7. The porous profiled composite wick micro heat pipe of claim 1, wherein the composite wick is hydrophilically treated with FeCl3And corroding the treated wick by using HCl mixed solution.
8. The porous profiled composite wick micro heat pipe according to claim 1, wherein the composite wick is parallel to and centered on the copper-based pipe, and both ends of the wick are connected to both ends of the copper-based pipe by sintering.
9. A preparation method of a porous special-shaped composite liquid absorption core micro heat pipe is characterized by comprising the following steps:
s1, placing a copper capillary tube and copper powder in ethanol for ultrasonic cleaning, and then washing the copper capillary tube and the copper powder clean by deionized water;
s2, putting the cleaned copper capillary tube and copper powder into a drying box, drying and taking out the copper capillary tube and the copper powder, firstly laying a layer of copper powder in a graphite mould, then laying the copper capillary tube on the copper powder according to the shape required by a liquid absorption core, then putting the copper capillary tube into a sintering furnace, sintering the copper capillary tube in hydrogen atmosphere, cooling, taking out, cleaning and drying the copper capillary tube after the completion of the sintering, then sintering the large pore part of an evaporation section, taking out, cleaning and drying the copper capillary tube after the completion of the sintering, then placing a copper powder sintering heat insulation section, taking out, cleaning and drying the copper powder, and then placing a copper powder sintering condensation section;
the heat insulation section is rectangular, the width of the evaporation section is gradually decreased from the evaporation end to the heat insulation section in an arc shape, the width of the condensation section is gradually increased from the heat insulation section to the condensation end in an arc shape, the area ratio of the heat insulation section is small, and the area ratio of the evaporation section to the condensation section is large;
s3, taking out the cooled wick structure, putting the wick structure into ethanol for ultrasonic cleaning, then washing the wick structure with deionized water, and putting the wick structure into a drying oven for drying;
s4, cutting a red copper round pipe with a proper length by using a cutting machine, necking one end of the red copper round pipe, then placing the red copper round pipe into ethanol for ultrasonic cleaning, then washing the red copper round pipe clean by using deionized water, and placing the red copper round pipe into a drying box for drying;
s5, placing the cleaned copper pipe under a hot press to be pressed into a copper-based pipe with the required thickness, then placing the liquid absorption core structure in the copper-based pipe, pressing by using the hot press, then placing the copper-based pipe into a sintering furnace, sintering and molding in a hydrogen atmosphere, and sealing one end of the non-reduced opening after cooling;
s6, FeCl is injected from one end of the reducing port3Mixing the solution with HCl, placing the heat pipe in an ultrasonic cleaning machine to vibrate, pouring out the solution after uniform corrosion for several minutes, then injecting deionized water to repeatedly perform ultrasonic cleaning, and drying after cleaning;
s7, injecting deionized water from one end of the necking, placing the other end of the necking into warm water, then carrying out vacuum pumping treatment, cutting off redundant necking by cold welding, and sealing to obtain the micro heat pipe.
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| CN100480611C (en) * | 2005-11-17 | 2009-04-22 | 富准精密工业(深圳)有限公司 | Heat pipe |
| CN201555484U (en) * | 2009-11-10 | 2010-08-18 | 昆山巨仲电子有限公司 | Flat heat pipe structure |
| JP6033029B2 (en) * | 2012-10-01 | 2016-11-30 | 株式会社フジクラ | Wick manufacturing method |
| TW201518670A (en) * | 2013-11-07 | 2015-05-16 | Hao Pai | Longitudinal refluxing wick structure of ultrathin heat pipe and manufacturing method thereof |
| JP5685656B1 (en) * | 2014-01-17 | 2015-03-18 | 株式会社フジクラ | heat pipe |
| CN107449303A (en) * | 2016-05-31 | 2017-12-08 | 台达电子工业股份有限公司 | Heat pipe and preparation method thereof |
| JP7123576B2 (en) * | 2017-05-30 | 2022-08-23 | 株式会社フジクラ | heat pipe |
| CN108507384A (en) * | 2018-04-02 | 2018-09-07 | 南京航空航天大学 | A kind of two-dimensional gradient hole composite wick and preparation method thereof |
| CN110608628A (en) * | 2019-09-12 | 2019-12-24 | Oppo广东移动通信有限公司 | Temperature-equalizing plate and hydrophilic treatment method of temperature-equalizing plate |
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