CN116056416A - Soaking plate based on pyrolytic graphite - Google Patents
Soaking plate based on pyrolytic graphite Download PDFInfo
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- CN116056416A CN116056416A CN202211683233.7A CN202211683233A CN116056416A CN 116056416 A CN116056416 A CN 116056416A CN 202211683233 A CN202211683233 A CN 202211683233A CN 116056416 A CN116056416 A CN 116056416A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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Abstract
The invention provides a soaking plate based on pyrolytic graphite, which comprises a first cover plate, a second cover plate and a liquid suction core; a gap interlayer is arranged between the first cover plate and the second cover plate at intervals, an assembly groove cavity is formed on the inner surface of the second cover plate, and an etching surface with a wavy etching pattern is formed on the inner surface of the first cover plate; the liquid suction core comprises a copper substrate and a foil plate, wherein a hollowed-out hole array is formed on the copper substrate, and an outer convex ring column is formed on the outer edge of a hollowed-out hole unit of the hollowed-out hole array; the foil plate is attached to the back side of the corresponding outer convex ring cylinder on the copper substrate and keeps flush with the cavity plane of the assembly groove cavity; the gap interlayer between the foil plate and the first cover plate is filled with pyrolytic graphite, and working medium is injected into the gap of the assembly groove cavity at the lower part of the foil plate. The soaking plate based on pyrolytic graphite has obvious advantages in the aspects of light weight, reliability, heat dissipation, packaging size limitation, applicable temperature area, protection capability and the like.
Description
Technical Field
The invention belongs to the technical field of heat dissipation of electronic chips, and particularly relates to a soaking plate based on pyrolytic graphite.
Background
In recent years, with the expansion of functions of related electronic devices, the power used tends to be high, and the devices have a large number of modules with large heat generation, which is easy to cause a large burden on the devices in a continuous operation state. For the above reasons, it is important to find a highly reliable heat dissipation scheme to achieve rapid cooling of electronic devices.
Electronic equipment under the traditional technical conditions is mostly cooled by adopting an air cooling or liquid cooling mode. The air cooling heat dissipation mode has a simple structure and low use cost, but the heat dissipation capability of the electronic components with high density and high power cannot meet the requirements; the liquid cooling heat dissipation capability is stronger, but the obvious characteristics are that the internal flow channel is easy to have corrosion resistance due to the poor self corrosion resistance, galvanic corrosion and the existence of the change of the pH value of the cooling liquid, so that the application range of the liquid cooling heat dissipation device is limited.
In order to solve the problem of high heat productivity of the electronic equipment, a Vapor Chamber (VC) is produced by adopting copper and copper alloy materials, the heat transfer property of a heat conduction principle and a working medium is fully utilized, and the heat of a heating object is quickly transferred to the outside of a heat source through a heat pipe, so that the Vapor Chamber has excellent apparent heat conductivity and heat conductivity exceeding that of any known metal. However, according to the prior art, the heat dissipation effect of the metal vapor chamber reaches the limit under the condition of the existing vapor chamber structure, so that the heat dissipation capability of the metal vapor chamber under the complex working condition is not ideal, and the problems of internal medium denaturation, inner cavity runner corrosion and the like are also faced after the metal vapor chamber is used for a long time; in addition, the applicable temperature range of the conventional soaking plate made of single metal material is smaller and is generally not more than 160 ℃, so that the application of the soaking plate is greatly limited.
Disclosure of Invention
The invention aims to provide a soaking plate based on pyrolytic graphite, which can effectively improve the heat dissipation capacity of the soaking plate and solve the problems that the applicable temperature range of a metal soaking plate is smaller and the soaking plate fails under the long-time use condition in the prior art.
The technical problems solved by the invention are realized by adopting the following technical scheme:
a soaking plate based on pyrolytic graphite comprises a first cover plate, a second cover plate and a liquid suction core;
the upper surface of the first cover plate and/or the lower surface of the second cover plate is provided with a joint surface matched with the corresponding thermal element;
the first cover plate and the second cover plate are sealed and fixed at the outer edge, and a gap interlayer is arranged between the first cover plate and the second cover plate which are pressed together at the outer edge; the second cover plate is provided with an assembly groove cavity in a molding mode on the inner surface, and the first cover plate is provided with an etching surface with a wavy etching pattern in a molding mode on the inner surface;
the liquid suction core comprises a copper substrate and a foil plate, wherein a hollowed-out hole array is uniformly formed on the copper substrate, hollowed-out hole units in the hollowed-out hole array are round holes, outer edges of the round holes are formed with outer convex ring columns matched with the round holes, the outer convex ring columns on the hollowed-out hole array are provided with an outer surface which is flush, and the copper substrate is attached to the bottom surface of the cavity of the assembly groove cavity at the side of the outer surface; the foil plate is attached to the back side of the corresponding outer convex ring cylinder on the copper substrate and keeps flush with the cavity plane of the assembly groove cavity;
the gap interlayer between the foil plate and the first cover plate is filled with pyrolytic graphite, and working medium is injected into the gap of the assembly groove cavity at the lower part of the foil plate.
As a further limitation, the first cover plate and the second cover plate are aluminum plates or aluminum alloy plates, and oxide film layers are formed on the surfaces of the first cover plate and the second cover plate through plating processes and coating processes to serve as structural protection layers.
As a further limitation, the first cover plate and the second cover plate are sealed and fixed at the outer edge by integral casting or welding, and the welding mode is preferably high-temperature brazing, laser welding or diffusion welding.
As a further limitation, the first cover plate and the second cover plate are sequentially subjected to a heat treatment and a passivation treatment:
the heat treatment is carried out in a protective gas or vacuum environment, the heat treatment temperature is 500-900 ℃, and the treatment time is 3-5 h;
the passivation treatment is carried out in a microwave environment of 500-700W, the temperature is controlled at 250-400 ℃, and the treatment time is 60-90 min.
As a further limitation, the pyrolytic graphite is preferably high-orientation pyrolytic graphite (HOPG highly oriented pyrolytic graphite) obtained by high-temperature treatment, and the grain size of graphite flake in the high-orientation pyrolytic graphite is 6-20 μm, and the pyrolytic graphite is shaped by trimming after being cut by water flow.
As a further limitation, the working medium injected into the vapor chamber is purified water or alcohols.
The beneficial effects are that: the soaking plate based on pyrolytic graphite provided by the invention has the advantages that the applicable temperature of the soaking plate is widened from 160 ℃ to 200 ℃ and the use temperature limit of the traditional copper soaking plate and a heat pipe is eliminated, so that the soaking plate can meet the use requirements of most of electronic equipment in the existing market.
The vapor chamber based on pyrolytic graphite has the same advantages in heat conduction, the weight of the vapor chamber is 30-40% lighter than that of a traditional copper vapor chamber with the same volume, the heat conduction efficiency of a double-medium structure is higher, heat accumulation is less likely to be caused, and the reliability and stability of long-term operation of equipment can be effectively improved when corresponding equipment is attached to the vapor chamber.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
Wherein: 1. a first ear; 2. welding edges; 3. a second ear; 4. sealing edges; 5. etching the surface; 6. pyrolytic graphite; 7. a foil plate; 8. a copper substrate; 9. an outer convex ring column; 10. a working medium; 11. a first cover plate; 12. a second cover plate; 13. a thermal element.
Detailed Description
In order to better understand the technical solution of the present invention and make the technical means, creation characteristics, achievement purposes and effects achieved by the present invention easy to understand, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the specific drawings.
This embodiment is only a part of the embodiments of the present invention and represents all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention. It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present invention are intended to cover a non-exclusive inclusion, such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed.
Referring to a preferred embodiment of a pyrolytic graphite-based soaking plate in fig. 1, in this embodiment, the pyrolytic graphite-based soaking plate includes a first cover plate 11, a second cover plate 12 and a wick, where the first cover plate 11 and the second cover plate 12 are formed by punching after cutting an aluminum plate, and the first cover plate 11 and the second cover plate 12 are formed with a first ear 1 and a second ear 3 matched at the outer edges, so as to perform matching covering during forming. The side of the first cover plate 11 and the side of the second cover plate 12 are respectively provided with a liquid injection pipe connected with the inner space of the first cover plate 11 and the inner space of the second cover plate 12 so as to facilitate the assembly forming of the vapor chamber.
In this embodiment, the second cover plate 12 is formed with an assembly groove cavity on the inner surface, and the assembly groove cavity is formed with a liquid suction core, wherein the liquid suction core comprises a copper substrate 8 and a foil plate 7, the foil plate 7 is a copper foil plate, and is sealed on a corresponding plane of the outer surface of the cavity of the assembly groove cavity, and the outer edge of the foil plate is sealed in an edge sealing manner through a sealing edge 4 in a powder metallurgy manner. The copper substrate 8 is a preformed hollowed-out copper plate and is subjected to trimming molding after laser cutting, hollowed-out hole arrays are uniformly molded on the corresponding hollowed-out copper plate, hollowed-out hole units in the hollowed-out hole arrays are round holes, outer edges of the round holes are molded with outer convex ring columns 9 matched with the round holes, the outer convex ring columns 9 on the copper substrate 8 are provided with flush outer surfaces on the top surfaces, the outer surfaces of the copper substrate 8 can be propped against the inner side surfaces of the foil plates 7 while being propped against the inner surfaces of the second cover plates 12, and purified water is injected into gaps of the assembly groove cavities at the lower parts of the foil plates 7 to serve as working mediums 10.
The first cover plate 11 is formed with a gap interlayer on the inner side surface, the gap interlayer is formed with a wavy etched surface 5 on the top surface, a pyrolytic graphite 6 matched with the gap interlayer in size is lined in the gap interlayer, the pyrolytic graphite 6 is high-orientation pyrolytic graphite with the graphite flake particle size of 8-15 mu m obtained after high-temperature treatment, the pyrolytic graphite is formed by trimming after being cut by a high-pressure water knife, the etched surface 5 is used for assisting heat dissipation, and the stability of the pyrolytic graphite 6 after being attached in the gap interlayer is improved; the pyrolytic graphite 6 has the heat conductivity far higher than that of cast aluminum (the heat conductivity is about 376W/m.k), so that the heat dissipation capacity of the vapor chamber is greatly improved; meanwhile, a heat exchange space can be formed with the liquid absorption core by being attached to the liquid absorption core, heat dissipation complementation is formed, the problems that the process is complex when the raw materials of the liquid absorption core are formed by adopting metal mesh, metal powder and the like as internal liquid absorption core raw materials in a sintering process, and hollow or connection defects are easy to generate in a cavity of a soaking plate are avoided, so that the heat dissipation performance of the heat dissipation plate is improved, and the heat dissipation capability bottleneck problem of the single-material soaking plate is solved.
In this embodiment, the first cover plate 11 and the second cover plate 12 are formed by using aluminum plates as materials, so that the aluminum plates have better mechanical strength and heat conductivity, and heat treatment and passivation treatment are needed to optimize the service performance of the aluminum plates, wherein the first cover plate 11 and the second cover plate 12 are placed in a furnace body during heat treatment, the furnace body is vacuumized and then heated to 680 ℃, then heat preservation is performed for 4 hours, then the aluminum plates are taken out after being cooled to normal temperature along with the furnace, and are sent into an industrial furnace for microwave-assisted passivation treatment after being placed for 30 minutes, and the passivation is completed after the furnace body is controlled to be at 32-350 ℃ in a microwave environment of 550W and processed for 70 minutes. The heat treatment can make the first cover plate 11 and the second cover plate 12 have good flatness and stable structural strength, and the passivation treatment process after the heat treatment can be matched with the two-stage heating treatment of the heat treatment process, so that the first cover plate 11 and the second cover plate 12 have good anti-corrosion effect.
The mode of injecting purified water as working medium 10 in the gap of the assembly groove cavity at the lower part of the foil plate 7 is consistent with the traditional metal vapor chamber forming mode, the operation of injecting the working medium 10 is carried out through the liquid injection pipe arranged at one side of the second cover plate 12, the inner side of the liquid injection pipe is communicated with the assembly groove cavity, the liquid suction core is injected into the assembly groove cavity through the liquid injection pipe after being fixed in the assembly groove cavity, the working medium 10 is injected, air is discharged, and then the liquid injection pipe is sealed and cut.
The first cover plate 11 and the second cover plate 12 are respectively formed in the above manner, then are covered on the surface of the second ear plate 3 at the outer edge through the first ear 1, and are formed at the position corresponding to the welding edge 2 through laser welding. And after the forming, the gap interlayer is vacuumized through another liquid injection pipe connected with the gap interlayer on one side of the first cover plate 11, and after the vacuumization, the liquid injection pipe is sealed and cut.
In the present embodiment, the lower surface of the second cover plate 12 has an abutting surface matched with the corresponding thermal element 13, so that the thermal element 13 is closely abutted to improve heat dissipation performance; in other embodiments, considering that the soaking plate may be used in a slightly curved surface or an irregular plane, the corresponding wick composed of the copper substrate 8 and the foil 7 is not suitable for processing the shape of the bonding surface, and the bonding surface may be provided on the surface of the first cover plate 11, and the heat dissipation may be performed by using the pyrolytic graphite 6 which is easier to process as a material of the bonding side to perform surface bonding to improve the applicability.
Meanwhile, in the present embodiment, the aluminum material characteristics of the first cover plate 11 and the second cover plate 12 also have the advantages of good processing performance and strong protection capability, and the oxidation coating process applicable to the aluminum material can be adopted to form a protection system, such as conductive oxidation, sulfuric acid anodic oxidation, hard anodic oxidation, micro-arc oxidation, and the like, so that the surface performance of the formed soaking plate is improved.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The soaking plate based on pyrolytic graphite is characterized by comprising a first cover plate, a second cover plate and a liquid suction core;
the upper surface of the first cover plate and/or the lower surface of the second cover plate is provided with a joint surface matched with the corresponding thermal element;
the first cover plate and the second cover plate are sealed and fixed at the outer edge, and a gap interlayer is arranged between the first cover plate and the second cover plate which are pressed together at the outer edge; the second cover plate is provided with an assembly groove cavity in a molding mode on the inner surface, and the first cover plate is provided with an etching surface with a wavy etching pattern in a molding mode on the inner surface;
the liquid suction core comprises a copper substrate and a foil plate, wherein a hollowed-out hole array is uniformly formed on the copper substrate, hollowed-out hole units in the hollowed-out hole array are round holes, outer edges of the round holes are formed with outer convex ring columns matched with the round holes, the outer convex ring columns on the hollowed-out hole array are provided with an outer surface which is flush, and the copper substrate is attached to the bottom surface of the cavity of the assembly groove cavity at the side of the outer surface; the foil plate is attached to the back side of the corresponding outer convex ring cylinder on the copper substrate and keeps flush with the cavity plane of the assembly groove cavity;
the gap interlayer between the foil plate and the first cover plate is filled with pyrolytic graphite, and working medium is injected into the gap of the assembly groove cavity at the lower part of the foil plate.
2. The pyrolytic graphite-based soaking plate according to claim 1, wherein the first cover plate and the second cover plate are aluminum plates or aluminum alloy plates, and oxide film layers are formed on the surfaces of the first cover plate and the second cover plate through plating processes and coating processes to serve as structural protection layers.
3. The pyrolytic graphite based soaking plate according to claim 1, wherein the first cover plate and the second cover plate are integrally cast in a manner of sealing and fixing at the outer edge.
4. The pyrolytic graphite-based soaking plate according to claim 1, wherein the first cover plate and the second cover plate are sealed and fixed at the outer edge by high-temperature brazing, laser welding or diffusion welding.
5. The pyrolytic graphite based soaking plate according to claim 1, wherein the first cover plate and the second cover plate are sequentially subjected to a heat treatment and a passivation treatment:
the heat treatment is carried out in a protective gas or vacuum environment, the heat treatment temperature is 500-900 ℃, and the treatment time is 3-5 h;
the passivation treatment is carried out in a microwave environment of 500-700W, the temperature is controlled at 250-400 ℃, and the treatment time is 60-90 min.
6. The pyrolytic graphite-based soaking plate according to claim 1, wherein pyrolytic graphite is preferably high-orientation pyrolytic graphite obtained by high-temperature treatment, and graphite flakes in the high-orientation pyrolytic graphite have a particle size of 6-20 μm, and are subjected to water flow cutting and trimming forming.
7. The pyrolytic graphite based soaking plate according to claim 1, wherein the working medium injected into the soaking plate is purified water or alcohols.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211683233.7A CN116056416A (en) | 2022-12-27 | 2022-12-27 | Soaking plate based on pyrolytic graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211683233.7A CN116056416A (en) | 2022-12-27 | 2022-12-27 | Soaking plate based on pyrolytic graphite |
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| Publication Number | Publication Date |
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| CN116056416A true CN116056416A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211683233.7A Pending CN116056416A (en) | 2022-12-27 | 2022-12-27 | Soaking plate based on pyrolytic graphite |
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| CN (1) | CN116056416A (en) |
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- 2022-12-27 CN CN202211683233.7A patent/CN116056416A/en active Pending
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