CN108168345A - For the heat sink and its manufacturing method under superelevation heat flow density - Google Patents

For the heat sink and its manufacturing method under superelevation heat flow density Download PDF

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Publication number
CN108168345A
CN108168345A CN201810143868.5A CN201810143868A CN108168345A CN 108168345 A CN108168345 A CN 108168345A CN 201810143868 A CN201810143868 A CN 201810143868A CN 108168345 A CN108168345 A CN 108168345A
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CN
China
Prior art keywords
heat sink
open channel
flow density
heat
hydrophilic coating
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Pending
Application number
CN201810143868.5A
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Chinese (zh)
Inventor
周文斌
胡学功
张桂英
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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Application filed by Institute of Engineering Thermophysics of CAS filed Critical Institute of Engineering Thermophysics of CAS
Priority to CN201810143868.5A priority Critical patent/CN108168345A/en
Publication of CN108168345A publication Critical patent/CN108168345A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00Heat-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
    • F28D15/02Heat-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
    • F28D15/04Heat-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
    • F28D15/046Heat-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 disclosure provides a kind of heat sink and its manufacturing method under superelevation heat flow density, including:Heat sink substrate, for radiating for heating device, including:Open channel is arranged in any plate face of the heat sink substrate, is flowed using capillary phenomenon driving heat radiation working medium along the open channel;And hydrophilic coating, it is arranged on the surface of the open channel, the hydrophilic coating Surface Creation polarized molecular radical, the hydrophilic coating and the polar molecule group are used to improve the fluid infusion ability of the open channel.The heat sink polar molecule group by setting hydrophilic coating and hydrophilic coating surface being used under superelevation heat flow density that the disclosure provides, greatly increase the capillary gradients in open channel, so that heat sink under superelevation heat flow density have timely fluid infusion ability, high heat-exchanging performance heat sink under superelevation heat flow density and high reliability ensure that.

Description

For the heat sink and its manufacturing method under superelevation heat flow density
Technical field
This disclosure relates to phase-change heat-exchange technical field more particularly to a kind of heat sink and its system under superelevation heat flow density Make method.
Background technology
Along with electronic industry high-performance, micromation, integrated development trend, the power density of electronic device is increasingly Greatly, such as:Power density using COB (Chip On Board) integrated LED single light source of block fluorescence transition material reaches 50 ~500W/cm2, the fever heat flow density of electronic device is thus brought rapidly to increase.Define 20~150W/cm2It is close for high hot-fluid Degree;When heat flow density is more than 150W/cm2When, already exceed the critical heat flux that pool boiling phase-change heat-exchange occurs for stock size surface Density is defined as superelevation heat flow density.Under high heat flux density, if the high intensity calorific value of electronic device cannot effectively dissipate It goes, it will device temperature is caused to increase rapidly, serious performance, stability and the safety for reducing device and system.
In the prior art using it is high performance it is micro-/receive scale phase change enhanced heat exchange technology, exist in heat sink surface structure size Tens to hundreds of microns of open micro-channel array, composite phase-change strengthening heat transfer can occur for surface.It is open The capillary gradients that micro-channel array is formed can drive liquid working substance to flow, and three-phase line of contact region promotees in channel Meniscus evaporation thin film is extended into being formed, so as to create the pure evaporation and heat-exchange condition of high intensity, and in higher thermal load conditions Under, it may occur that thin liquid film evaporates and the composite phase-change heat exchange of thick liquid film region kernel state boiling, is a kind of typical high-performance quilt Dynamic formula minute yardstick phase-change heat-exchange technology, can be utilized to implement the high coefficient of heat transfer under low thermal resistance and condition of small temperature difference and high hot-fluid The heat transfer process of density.It is this that there is the heat sink of open micro-channel array can effectively solve electronic device under high heat flux density Heat dissipation problem.
However during the disclosure is realized, applicants have discovered that, under the conditions of superelevation heat flow density, as hot-fluid is close The further raising of degree, the liquid working substance in heat sink open micro-channel array will become to be easy to it is dry, once liquid pool Dry place is not replenished in time in interior liquid working substance, then can not continuously form thin liquid film and thick liquid film region, can not just send out yet The thin liquid film evaporation of raw high intensity and the composite phase-change heat exchange of thick liquid film nucleate boiling, heat sink heat dissipation performance and reliability are substantially Decline.
Invention content
(1) technical problems to be solved
Based on above-mentioned technical problem, the disclosure provides a kind of heat sink and its manufacturing method under superelevation heat flow density, To alleviate the heat dissipation work in of the prior art heat sink under the conditions of superelevation heat flow density, heat sink open micro-channel array Matter will easily dry up, and dry place can not be replenished in time in heat radiation working medium, under leading to heat sink heat dissipation performance and reliability substantially The technical issues of drop.
(2) technical solution
According to one aspect of the disclosure, provide it is a kind of for heat sink under superelevation heat flow density, including:Heat sink substrate, For radiating for heating device, including:Open channel is arranged in any plate face of the heat sink substrate, is showed using capillary As driving heat radiation working medium is flowed along the open channel;And hydrophilic coating, the surface of the open channel is arranged on, it should Hydrophilic coating Surface Creation polarized molecular radical, the hydrophilic coating and the polar molecule group are used to improve the opening The fluid infusion ability of formula channel.
In some embodiments of the present disclosure, the open channel includes N items, and open channel described in N items is set side by side It puts;Wherein N >=10.
In some embodiments of the present disclosure, the arranging density of the open channel is not less than 5/cm.
In some embodiments of the present disclosure, wherein:The width of the open channel is between 10 μm to 2000 μm; The depth of the open channel is between 10 μm to 2000 μm;The spacing of the two adjacent open channels between 10 μm extremely Between 2000 μm;The thickness of the hydrophilic coating is between 20nm to 50 μm.
In some embodiments of the present disclosure, wherein:The width of the open channel is between 200 μm to 500 μm; The depth of the open channel is between 200 μm to 1500 μm;The spacing of the two adjacent open channels is between 200 μm To between 500 μm.
In some embodiments of the present disclosure, the cross section of the open channel is rectangle, trapezoidal, triangle, circular arc Shape or irregular figure.
In some embodiments of the present disclosure, wherein:The hydrophilic coating includes:Woelm Alumina, porous oxidation niobium, oxygen Change at least one of zinc sodium, titanium oxide, zinc oxide, tin oxide, vanadic anhydride, copper oxide, cuprous oxide, Kocide SD; The polar molecule group includes:In carboxylic acid group, sulfonic group, phosphate, amino, quaternary ammonium group, hydroxyl, carboxylate, block polyether At least one;The heat sink substrate includes:At least one of metal, alloy, semiconductor, ceramics, oxide;It is wherein described The thermal conductivity factor of heat sink substrate is not less than 20W/mK.
According to another aspect of the disclosure, a kind of heat sink manufacturing method under superelevation heat flow density is also provided, Including:Step A:Open channel is generated in the one side of heat sink substrate;Step B:In the Surface Creation of the open channel Hydrophilic coating;Step C:In the Surface Creation polar molecule group of the hydrophilic coating, obtain disclosure offer is used for superelevation It is heat sink under heat flow density.
In some embodiments of the present disclosure, wherein, in the step A, pass through wire cutting method or laser processing The open channel is generated in the heat sink substrate.
In some embodiments of the present disclosure, wherein:In the step B, pass through physical vapour deposition (PVD), chemical vapor deposition Hydrophilic coating described in product, the Surface Creation of electrochemistry or oxidation-reduction method in the open channel;In the step C, pass through Polar molecule group described in the Surface Creation of chemical solution infusion method or Ultraviolet irradiation method in the hydrophilic coating.
(3) advantageous effect
It can be seen from the above technical proposal that the heat sink and its manufacturer being used under superelevation heat flow density that the disclosure provides Method has the advantages that one of them or a portion:
(1) by setting the polar molecule group of hydrophilic coating and hydrophilic coating surface, the cooperative reinforcing effect of the two The wetting characteristics on open channel surface can be greatly improved, greatly increases the capillary gradients in open channel so that It is heat sink under superelevation heat flow density that there is timely fluid infusion ability, once there is dry region in hot localised points, in big capillary gradients Driving under, heat radiation working medium adds to rapidly dry area, again soak open channel surface, persistently occur thin liquid film evaporation With the high-strength composite phase transformation strengthening heat transfer process of thick liquid film nucleate boiling, high heat exchange heat sink under superelevation heat flow density ensure that Performance and high reliability;
(2) a plurality of open channel is arranged side by side, and the width of open channel, depth and spacing are between 10 μm To between 2000 μm, heat exchange area is not only increased, it is often more important that the interfacial effect and dimensional effect of open channel can be right The flowing of heat radiation working medium and phase-change heat-exchange performance generate extraordinary invigoration effect, make its surface that thin liquid film evaporation and thick liquid film occur The high-strength composite phase transformation strengthening heat transfer process of nucleate boiling, theoretical maximum take hot heat flow density to can reach 104W/cm2Number Magnitude, phase-change heat transfer coefficient reach 106W/(m2The order of magnitude DEG C) takes thermal energy power to be much larger than the heat with stock size surface It is heavy.
Description of the drawings
Fig. 1 is the embodiment of the present disclosure for the heat sink structure diagram under superelevation heat flow density.
Fig. 2 a are the partial elevational elevation view of open channel in Fig. 1.
Fig. 2 b are the partial elevational elevation view of another structure of open channel in Fig. 1.
Fig. 2 c are the partial elevational elevation view of the yet another construction of open channel in Fig. 1.
Fig. 2 d are the partial elevational elevation view of the yet another construction of open channel in Fig. 1.
Fig. 2 e are the partial elevational elevation view of the yet another construction of open channel in Fig. 1.
The step of Fig. 3 is the heat sink manufacturing method that the embodiment of the present disclosure is used under superelevation heat flow density is schemed.
【Embodiment of the present disclosure main element symbol description in attached drawing】
10- heat sink substrates;
11- open channels;12- hydrophilic coatings;
121- polar molecule groups.
Specific embodiment
What the embodiment of the present disclosure provided is used in the heat sink and its manufacturing method under superelevation heat flow density, hydrophilic by setting Coating and the polar molecule group on hydrophilic coating surface, the cooperative reinforcing effect of the two can greatly improve open channel surface Wetting characteristics, greatly increase the capillary gradients in open channel, and then improve fluid infusion velocity, ensure that excessive heat Heat sink high heat-exchanging performance and high reliability under current density.
Purpose, technical scheme and advantage to make the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference The disclosure is further described in attached drawing.
Fig. 1 is the embodiment of the present disclosure for the heat sink structure diagram under superelevation heat flow density.Fig. 2 a are open in Fig. 1 The partial elevational elevation view of formula channel.
According to one aspect of the disclosure, provide it is a kind of for heat sink under superelevation heat flow density, as shown in Fig. 1-Fig. 2 a, Including:Heat sink substrate 10, for radiating for heating device, including:Open channel 11 is arranged on the either plate of heat sink substrate 10 On face, flowed using capillary phenomenon driving heat radiation working medium along open channel 11;And hydrophilic coating 12, it is arranged on open logical The surface in road 11, the 12 Surface Creation polarized molecular radical 121 of hydrophilic coating, hydrophilic coating 12 and polar molecule group 121 For improving the fluid infusion ability of open channel 11.By the polar molecule for setting 12 surface of hydrophilic coating 12 and hydrophilic coating Group 121, the cooperative reinforcing effect of the two can greatly improve the wetting characteristics on 11 surface of open channel, greatly increase open Capillary gradients in channel 11 so that it is heat sink under superelevation heat flow density that there is timely fluid infusion ability, once hot localised points There is dry region, under the driving of big capillary gradients, heat radiation working medium adds to rapidly dry area, soaks again open The high-strength composite phase transformation strengthening heat transfer process of thin liquid film evaporation and thick liquid film nucleate boiling persistently occurs for the surface of channel 11, It ensure that high heat-exchanging performance heat sink under superelevation heat flow density and high reliability.
In the present embodiment, open channel 11 includes N items, and N open channel 11 is set up in parallel;Wherein N >=10.
In the present embodiment, the arranging density of open channel 11 is not less than 5/cm, i.e., a plurality of is opened along what is be set up in parallel The orientation for putting formula channel counts, and the item number of interior open channel 11 per cm is not less than 5.
In the present embodiment, wherein:The width of open channel 11 is between 10 μm to 2000 μm;Open channel 11 Depth between 10 μm to 2000 μm;The spacing of two adjacent open channels 11 is between 10 μm to 2000 μm;It is hydrophilic The thickness of coating 12 is between 20nm to 50 μm.A plurality of open channel 11 is arranged side by side, and the width of open channel 11 Degree, depth and spacing not only increase heat exchange area, it is often more important that open channel between 10 μm to 2000 μm 11 interfacial effect and dimensional effect can generate extraordinary invigoration effect to the flowing of heat radiation working medium and phase-change heat-exchange performance, make it The high-strength composite phase transformation strengthening heat transfer process of thin liquid film evaporation and thick liquid film nucleate boiling occurs for surface, and theoretical maximum takes heat Heat flow density can reach 104The order of magnitude of W/cm2, phase-change heat transfer coefficient reach 106W/(m2DEG C) the order of magnitude, take thermal energy power Much larger than with the heat sink of stock size surface.
In the present embodiment, wherein:The width of open channel 11 is between 200 μm to 500 μm;Open channel 11 Depth between 200 μm to 1500 μm;The spacing of two adjacent open channels 11 is between 200 μm to 500 μm.It is open The size of formula channel 11 is smaller, and capillary phenomenon is more apparent, and fluid infusion ability is stronger.
Fig. 2 b are the partial elevational elevation view of another structure of open channel in Fig. 1.Fig. 2 c are open logical in Fig. 1 The partial elevational elevation view of the yet another construction in road.Fig. 2 d are the partial enlargement master of the yet another construction of open channel in Fig. 1 View.Fig. 2 e are the partial elevational elevation view of the yet another construction of open channel in Fig. 1.
In the present embodiment, as shown in Fig. 2 a- Fig. 2 e, the cross section of open channel 11 is rectangle, trapezoidal, triangle, Arc-shaped or irregular figure.
In the present embodiment, wherein:Hydrophilic coating 12 includes:Woelm Alumina, porous oxidation niobium, zinc oxide sodium, oxidation At least one of titanium, zinc oxide, tin oxide, vanadic anhydride, copper oxide, cuprous oxide, Kocide SD;Polar molecule group 121 include:At least one of carboxylic acid group, sulfonic group, phosphate, amino, quaternary ammonium group, hydroxyl, carboxylate, block polyether;Heat Heavy substrate 10 includes:At least one of metal, alloy, semiconductor, ceramics, oxide;Wherein, the heat conduction system of heat sink substrate 10 Number is not less than 20W/mK.
The step of Fig. 3 is the heat sink manufacturing method that the embodiment of the present disclosure is used under superelevation heat flow density is schemed.
According to another aspect of the disclosure, as shown in figure 3, providing a kind of heat sink system under superelevation heat flow density Method is made, including:Step A:Open channel 11 is generated in the one side of heat sink substrate 10;Step B:In open channel 11 Surface Creation hydrophilic coating 12;Step C:In the Surface Creation polar molecule group 121 of hydrophilic coating 12, obtain the present embodiment and carry Being used for for supplying is heat sink under superelevation heat flow density.
In the present embodiment, wherein, in step A, by wire cutting method or laser processing in heat sink substrate 10 Generate open channel 11.
In the present embodiment, wherein, in step B, pass through physical vapour deposition (PVD), chemical vapor deposition, electrochemistry or oxidation Reduction method is in the Surface Creation hydrophilic coating 12 of open channel 11;In step C, pass through chemical solution infusion method or ultraviolet irradiation Method is in the Surface Creation polar molecule group 121 of hydrophilic coating 12.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that it in attached drawing or says In bright book text, the realization method that is not painted or describes is form known to a person of ordinary skill in the art in technical field, and It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it.
According to above description, what those skilled in the art should provide the disclosure is used for heat sink under superelevation heat flow density And its manufacturing method has clear understanding.
In conclusion the heat sink and its manufacturing method being used under superelevation heat flow density that the disclosure provides is hydrophilic by setting The polar molecule group 121 on 12 surface of coating 12 and hydrophilic coating, the cooperative reinforcing effect of the two can greatly improve open The wetting characteristics on 11 surface of channel so that it is heat sink under superelevation heat flow density that there is timely fluid infusion ability, it ensure that superelevation hot-fluid Heat sink high heat-exchanging performance and high reliability under density.
It should also be noted that, the direction term mentioned in embodiment, for example, " on ", " under ", "front", "rear", " left side ", " right side " etc. is only the direction of refer to the attached drawing, is not used for limiting the protection domain of the disclosure.Through attached drawing, identical element by Same or similar reference numeral represents.When understanding of this disclosure may be caused to cause to obscure, conventional structure will be omitted Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure Content.In addition, in the claims, any reference mark between bracket should not be configured to the limit to claim System.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect, Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention:I.e. required guarantor The disclosure of shield requires features more more than the feature being expressly recited in each claim.More precisely, as following Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore, Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim is in itself All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out the purpose, technical solution and advantageous effect of the disclosure further in detail It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the disclosure, is not limited to the disclosure, it is all Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure Within the scope of shield.

Claims (10)

1. it is a kind of for heat sink under superelevation heat flow density, including:
Heat sink substrate, for radiating for heating device, including:
Open channel is arranged in any plate face of the heat sink substrate, using capillary phenomenon driving heat radiation working medium described in Open channel flows;And
Hydrophilic coating is arranged on the surface of the open channel, the hydrophilic coating Surface Creation polarized molecular radical, described Hydrophilic coating and the polar molecule group are used to improve the fluid infusion ability of the open channel.
2. according to claim 1 for heat sink under superelevation heat flow density, the open channel includes N items, N items institute Open channel is stated to be set up in parallel;
Wherein N >=10.
3. according to claim 2 for heat sink under superelevation heat flow density, the arranging density of the open channel is not Less than 5/cm.
4. it is according to claim 3 for heat sink under superelevation heat flow density, wherein:
The width of the open channel is between 10 μm to 2000 μm;
The depth of the open channel is between 10 μm to 2000 μm;
The spacing of the two adjacent open channels is between 10 μm to 2000 μm;
The thickness of the hydrophilic coating is between 20nm to 50 μm.
5. it is according to claim 4 for heat sink under superelevation heat flow density, wherein:
The width of the open channel is between 200 μm to 500 μm;
The depth of the open channel is between 200 μm to 1500 μm;
The spacing of the two adjacent open channels is between 200 μm to 500 μm.
6. according to claim 1 for heat sink under superelevation heat flow density, the cross section of the open channel is square Shape, trapezoidal, triangle, arc-shaped or irregular figure.
7. it is according to claim 1 for heat sink under superelevation heat flow density, wherein:
The hydrophilic coating includes:Woelm Alumina, porous oxidation niobium, zinc oxide sodium, titanium oxide, zinc oxide, tin oxide, five oxygen Change at least one of two vanadium, copper oxide, cuprous oxide, Kocide SD;
The polar molecule group includes:Carboxylic acid group, sulfonic group, phosphate, amino, quaternary ammonium group, hydroxyl, carboxylate, block gather At least one of ether;
The heat sink substrate includes:At least one of metal, alloy, semiconductor, ceramics, oxide;
The thermal conductivity factor of wherein described heat sink substrate is not less than 20W/mK.
8. a kind of heat sink manufacturing method under superelevation heat flow density, including:
Step A:Open channel is generated in the one side of heat sink substrate;
Step B:In the Surface Creation hydrophilic coating of the open channel;
Step C:In the Surface Creation polar molecule group of the hydrophilic coating, obtain such as any one of the claims 1 to 7 Described being used for is heat sink under superelevation heat flow density.
9. the heat sink manufacturing method according to claim 8 under superelevation heat flow density, wherein, in the step A, The open channel is generated in the heat sink substrate by wire cutting method or laser processing.
10. the heat sink manufacturing method according to claim 8 under superelevation heat flow density, wherein:
In the step B, by physical vapour deposition (PVD), chemical vapor deposition, electrochemistry or oxidation-reduction method described open Hydrophilic coating described in the Surface Creation of channel;
In the step C, pass through pole described in the Surface Creation of chemical solution infusion method or Ultraviolet irradiation method in the hydrophilic coating Property molecular radical.
CN201810143868.5A 2018-02-11 2018-02-11 For the heat sink and its manufacturing method under superelevation heat flow density Pending CN108168345A (en)

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Cited By (1)

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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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