WO2022075172A1 - Corps poreux, structure de dissipation de chaleur et appareil électronique - Google Patents

Corps poreux, structure de dissipation de chaleur et appareil électronique Download PDF

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Publication number
WO2022075172A1
WO2022075172A1 PCT/JP2021/036111 JP2021036111W WO2022075172A1 WO 2022075172 A1 WO2022075172 A1 WO 2022075172A1 JP 2021036111 W JP2021036111 W JP 2021036111W WO 2022075172 A1 WO2022075172 A1 WO 2022075172A1
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Prior art keywords
porous body
porosity
main surface
cross
section
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PCT/JP2021/036111
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English (en)
Japanese (ja)
Inventor
慶次郎 小島
竜宏 沼本
拓生 若岡
恵理子 澤田
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株式会社村田製作所
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Priority to JP2022555415A priority Critical patent/JP7231121B2/ja
Priority to CN202190000731.XU priority patent/CN220189633U/zh
Publication of WO2022075172A1 publication Critical patent/WO2022075172A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
    • H01L23/427—Cooling by change of state, e.g. use of heat pipes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a porous body, a heat dissipation structure and an electronic device.
  • the porous body is known as a structure having various functions such as a function as a filter, a function capable of moving a liquid by a capillary force, and a function as an adsorbent.
  • Such porous bodies include woven meshes, electrocast meshes, etched meshes, non-woven fabrics, sintered metals, sintered ceramics, inverted opal (honeycomb) structures, porous bodies manufactured by laser processing, and anodic oxidation. Manufactured porous bodies and the like are known.
  • the porous body having various functions as described above is used for various purposes.
  • Patent Document 1 a condensable fluid that evaporates and condenses according to the state of heat input and heat dissipation is enclosed as a working fluid in a hollow flat plate-shaped closed container, and the working fluid is moistened to reduce the capillary pressure.
  • the wick to be generated is arranged inside the closed container, the wick that generates a larger capillary pressure due to the wetting of the working fluid is arranged on the evaporation part side where heat is input from the outside, and the wick is arranged to the outside.
  • a vapor chamber is described in which a wick having a small flow resistance to a wet working fluid is arranged on the side of a condensing portion that dissipates heat.
  • a porous sintered body or a reticulated body (# 200 mesh as an example) made of fine particles (copper particles having a particle size of 25 to 100 ⁇ m as an example) is described.
  • These are porous bodies. That is, in Patent Document 1, the porous body is used as the wick of the vapor chamber.
  • a sponge-like calcined metal layer having a high porosity and having continuous pores that are open on the surface and continuous with internal pores has a porosity smaller than the porosity of the sponge-like calcined metal layer: 0.
  • a high-strength sponge-like calcined metal composite plate formed by laminating high-strength calcined metal dense reinforcing layers having a capacity% of ⁇ 55 (including 0), and the thickness of the calcined metal dense reinforcing layer is high-strength sponge-like.
  • a high-strength sponge-like calcined metal composite plate characterized by having a thickness of 0.5 to 30% of the total thickness of the calcined metal composite plate is described.
  • the high-strength sponge-like fired metal composite plate is a porous body. Further, Patent Document 2 describes that the high-strength sponge-like fired metal composite plate is used as an electrode substrate of an alkaline secondary battery.
  • Patent Document 3 describes a liquid phase diffusion reaction by heating a mixture containing two or more kinds of metal powders having different melting points, rosin and an activator, which contain a low melting point metal as one kind, at a melting point or higher of the low melting point metal. A method for producing a porous metal body is described. Further, Patent Document 3 describes that the porous metal body is used as a heat sink.
  • a liquid in a porous body having pores, a liquid can be absorbed inside the porous body by capillary force, and can be temporarily retained and stored. Further, when the pores communicate from one surface of the porous body to the other surface, the absorbed liquid can be transferred from one surface to the other surface.
  • Patent Documents 1 to 3 describe a porous body, the shape of pores in which a liquid easily moves from one surface to the other and easily holds and stores the liquid is described. There was room for improvement.
  • the problem to be solved by the present invention is to provide a porous body in which a fluid such as a liquid can move from one surface to the other and can hold and store a large amount of fluid.
  • the porous body of the present invention is a porous body having a first main surface and a second main surface facing the first main surface and having a plurality of pores, and is at least a part of the above-mentioned fine particles.
  • the hole is a communication hole that communicates the first main surface and the second main surface, and divides the porous body into two equal parts perpendicular to the direction of the first main surface and the second main surface.
  • the porous body of the present invention is a porous body having a first main surface and a second main surface facing the first main surface and having a plurality of pores, and is at least a part of the above-mentioned fine particles.
  • the hole is a communication hole that communicates the first main surface and the second main surface, and the cross section obtained by cutting the porous body perpendicular to the first main surface is defined as the second cross section of the porous body.
  • the end of the second cross section on the first main surface side is the first end
  • the end of the second cross section on the second main surface side is the second end
  • in the second cross section, the above When the portion through which the line that divides the porous body into two equal parts is defined as the central portion of the porous body so as to divide the first end side and the second end side into two equal parts, the first end is used.
  • the porosity of the portion is smaller than the porosity of the central portion
  • the porosity of the second end portion is smaller than the porosity of the central portion.
  • the heat dissipation structure of the present invention is a gas-liquid exchange type heat dissipation structure including a housing having an internal space, an operating medium enclosed in the internal space, and a wick enclosed in the internal space.
  • the wick includes the porous body of the present invention.
  • the electronic device of the present invention includes the above-mentioned heat dissipation structure of the present invention.
  • a porous body in which a fluid such as a liquid can move from one surface to the other and can hold and store a large amount of fluid.
  • FIG. 1A is a cross-sectional view schematically showing an example of the porous body according to the first embodiment of the present invention, which is parallel to the thickness direction of the porous body.
  • FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A.
  • FIG. 2 is a cross-sectional view schematically showing an example of the porous body according to the second embodiment of the present invention, which is parallel to the thickness direction of the porous body.
  • FIG. 3 is a cross-sectional view schematically showing an example of a heat dissipation structure according to a third embodiment of the present invention.
  • FIG. 4 is a perspective view schematically showing an example of a heat dissipation structure according to a fourth embodiment of the present invention.
  • FIG. 1A is a cross-sectional view schematically showing an example of the porous body according to the first embodiment of the present invention, which is parallel to the thickness direction of the porous body.
  • FIG. 1B is a cross-sectional view taken
  • FIG. 5 is a cross-sectional view of the heat dissipation structure shown in FIG. 4 along the IV-IV line.
  • FIG. 6 is a cross-sectional view taken along the line VV of the heat dissipation structure shown in FIG.
  • FIG. 7 is a cross-sectional view perpendicular to the Z-axis direction of the heat dissipation structure schematically showing another example of the internal structure of the heat dissipation structure according to the fourth embodiment of the present invention.
  • FIG. 8 is a cross-sectional view perpendicular to the Z-axis direction of the heat dissipation structure schematically showing still another example of the internal structure of the heat dissipation structure according to the fourth embodiment of the present invention.
  • FIG. 9 is a cross-sectional view perpendicular to the Y-axis direction of the heat dissipation structure according to the fifth embodiment of the present invention.
  • FIG. 10 is an enlarged view of the broken line portion of FIG.
  • the porous body of the present invention will be described.
  • the present invention is not limited to the following configuration, and can be appropriately modified and applied without changing the gist of the present invention. It should be noted that a combination of two or more of the individual desirable configurations of the present invention described below is also the present invention.
  • FIG. 1A is a cross-sectional view schematically showing an example of the porous body according to the first embodiment of the present invention, which is parallel to the thickness direction of the porous body.
  • FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A.
  • the porous body 10 shown in FIG. 1A is a porous body having a first main surface 11 and a second main surface 12 facing the first main surface 11 and having a plurality of pores 20. At least a part of the pores 20 is a communication hole 21 that communicates the first main surface 11 and the second main surface 12. Therefore, when the fluid flows into the pores 20, the fluid can move from the first main surface 11 to the second main surface 12 through the communication holes 21.
  • Whether or not the communication hole is formed in the porous body can be determined by the following method.
  • the porous body is allowed to stand with the first main surface facing upward, and 0.01 mL of water per 1 mm3 of the volume of the porous body is infiltrated into the first main surface over time so as not to spill from the first main surface. ..
  • the infiltrated water reaches the second main surface within 100 seconds per 1 mm of the distance from the first main surface to the second main surface of the porous body, a communication hole is formed in the porous body.
  • the cross section obtained by cutting the porous body 10 into two equal parts perpendicular to the direction from the first main surface 11 to the second main surface 12 is the first cross section CS 1 (1) of the porous body 10. That is, the porosity of the first main surface 11 is smaller than the porosity of the first cross section CS 1 and the porosity of the second main surface 12 is the first cross section. It is smaller than the porosity of CS 1 . Therefore, in the porous body 10, a large amount of fluid can be retained and stored inside.
  • the porosity of the first main surface 11 is preferably 30% or more and 50% or less. If the porosity of the first main surface is less than 30%, the pores are too small and the fluid is less likely to flow in and out of the porous body. When the porosity of the first main surface exceeds 50%, the strength of the porous body is lowered and it is easily damaged. In addition, the capillary force becomes low, and the liquid transport capacity tends to decrease.
  • the porosity of the second main surface 12 is preferably 30% or more and 50% or less. If the porosity of the second main surface is less than 30%, the pores are too small and the fluid is less likely to flow in and out of the porous body. If the porosity of the second main surface exceeds 50%, the strength of the porous body decreases and it becomes easy to break.
  • the porosity of the first main surface 11 and the porosity of the second main surface 12 may be the same or different.
  • the porosity of the first cross section CS 1 is preferably 40% or more and 80% or less.
  • the porosity of the first cross section CS 1 is less than 40%, it becomes difficult to retain and store the fluid inside the porous body.
  • the porosity of the first cross section CS 1 exceeds 80%, the strength of the porous body is lowered and it is easily damaged.
  • the difference between the value of the porosity of the first cross section CS 1 and the value of the porosity of the first main surface 11 is preferably 10% or more, and more preferably 20% or more and 30% or less. If the difference between the value of the porosity of the first cross section CS 1 and the value of the porosity of the first main surface is less than 10%, it becomes difficult to obtain the effect of retaining and storing the fluid in the porous body.
  • the difference between the value of the porosity of the first cross section CS 1 and the value of the porosity of the second main surface 12 is preferably 10% or more, and more preferably 20% or more and 30% or less. If the difference between the porosity value of the first cross section CS 1 and the porosity value of the second main surface is less than 10%, it becomes difficult to obtain the effect of retaining and storing the fluid in the porous body.
  • the difference between the porosity value of the first cross section CS 1 and the porosity value of the first main surface 11 is 10% or more, and the porosity of the first cross section CS 1 It is more preferable that the difference between the value and the value of the porosity of the second main surface 12 is 10% or more.
  • the porosity of the entire porous body 10 is preferably 30% or more and 70% or less, and more preferably 40% or more and 60% or less.
  • the porosity of the entire porous body means a value measured by the following method.
  • the porous body is divided into 10 equal parts in the direction from the first main surface to the second main surface to prepare a cross section.
  • the obtained image is binarized by image processing, and the ratio of the area of the region where the void is formed is calculated.
  • the average value of the porosity of each image is taken as the total porosity of the porous body.
  • the cross section divided into 10 equal parts may be photographed while polishing in order from the surface.
  • the average pore diameter of the pores 20 is preferably 100 nm or more and 10 ⁇ m or less, and more preferably 500 nm or more and 5 ⁇ m or less. When the average pore diameter of the pores 20 is within the above range, high capillary force can be exhibited.
  • the average pore ratio of the pores of the porous body means a value calculated by the following method. Each surface of the first main surface, the first cross section and the second main surface is photographed by SEM. From each of the obtained images, the major axis of any 10 pores is calculated. The average value of the calculated values is taken as the average pore diameter of the pores of the porous body.
  • some of the communication holes 21 have branch holes 22.
  • the fluid flows into the porous body 10, the fluid can also pass through the branch hole 22. Therefore, in the porous body 10, the transmittance of the fluid is high. Further, even if the communication hole 21 is clogged or the like, the fluid can move from the first main surface 11 to the second main surface 12.
  • the branch hole 22 may also communicate with the side surface of the porous body 10.
  • the fluid can move from the first main surface 11 to the side surface of the porous body 10, and the fluid is porous from the second main surface. It can move to the side of the body 10. Further, the fluid can move from the side surface of the porous body 10 to the first main surface 11 and / or the second main surface 12.
  • the tip 22a of a part of the branch holes 22 exists inside the porous body 10. Therefore, even if the fluid flows into the pores 20, the fluid cannot go beyond the tip 22a and stays at the tip 22a. As a result, fluid retention and storage capacity is improved.
  • the material of the porous body 10 is not particularly limited, and examples thereof include a metal sintered body, a ceramic sintered body, and a plastic sintered body. Among these, a metal sintered body is preferable.
  • the porous body is a metal sintered body
  • the metal constituting the metal sintered body include copper, stainless steel, titanium, and aluminum. Of these, copper is preferred. Copper is ductile, has excellent mechanical strength, and is also excellent in electrical conductivity and thermal conductivity. Also, copper is inexpensive and easy to handle.
  • the porous body 10 can be used as a wick for transporting an operating medium in a gas-liquid exchange type heat dissipation structure or as a battery separator.
  • a sintering base material as a base material and a foaming agent are mixed and molded into a desired shape to prepare a molded body.
  • the base material for sintering metal powder is preferable.
  • the metal powder include copper powder, stainless steel powder, titanium powder, aluminum powder and the like. Of these, copper powder is preferable. Further, the metal powder is preferably in the form of particles having a diameter of 1 ⁇ m or more and 10 ⁇ m or less.
  • foaming agent resin beads such as acrylic resin, styrene resin, cellulosic resin, and polyvinyl resin can be used.
  • the foaming agent is preferably in the form of particles having a diameter of 100 nm or more and 10 ⁇ m or less.
  • the weight ratio is less than 10
  • the proportion of copper as a base material is small, and the strength of the porous body tends to decrease.
  • the weight ratio exceeds 50, the proportion of the foaming agent is small, so that it becomes difficult to form communication holes in the obtained porous body.
  • a porous sintered body is formed by heating the produced molded body.
  • the heating conditions are preferably atmosphere: hydrogen, temperature: 600 ° C. or higher, 900 ° C. or lower, time: 1 hour or longer, 5 hours or shorter.
  • the foaming agent is thermally decomposed. Inside the sintered body, pores are formed at the place where the foaming agent was located. Further, pores are formed by the thermal decomposition of the foaming agent even in the vicinity of the surface of the sintered body, but in the vicinity of the surface of the sintered body, sintering tends to proceed, so that small pores are easily filled. As a result, the porosity of the surface of the porous body becomes smaller than the porosity of the first cross section. Further, when the fired base material is copper powder, the surface of the sintered body is easily melted, so that the pores formed near the surface of the sintered body are easily filled by the influence of surface tension, which is also a void on the surface of the porous body. It causes the rate to be smaller than the porosity of the first cross section.
  • a sintered body which is an example of the porous body according to the first embodiment of the present invention, can be produced.
  • Example 1 examples of the porous body according to the first embodiment of the present invention will be shown. The present invention is not limited to these examples.
  • Copper powder (product name: 1300YM, manufacturer: Mitsui Mining & Smelting Co., Ltd.) is 80 g
  • foaming agent product name: MX-80H3WT, manufacturer: Soken Kagaku Co., Ltd.
  • the porosity of the first main surface was 30%
  • the porosity of the first cross section was 60%
  • the porosity of the second main surface was 30%.
  • the capillary force of the porous body according to Example 1 was measured by the following method, the value was 80,000 Pa.
  • the capillary force was measured by Porous Materials Inc. It was carried out by a bubble burst test by Perm Composer of (PMI).
  • FIG. 2 is a cross-sectional view schematically showing an example of the porous body according to the second embodiment of the present invention, which is parallel to the thickness direction of the porous body.
  • the porous body 10a shown in FIG. 2 is a porous body having a first main surface 11 and a second main surface 12 facing the first main surface 11 and having a plurality of pores 20. At least a part of the pores 20 is a communication hole 21 that communicates the first main surface 11 and the second main surface 12. Therefore, when the fluid flows into the pores 20, the fluid can move from the first main surface 11 to the second main surface 12 through the communication holes 21.
  • the cross section obtained by cutting the porous body 10a perpendicular to the first main surface 11 is referred to as the second cross section CS 2 of the porous body 10a, and the cross section of the second cross section CS 2 on the first main surface 11 side.
  • the end portion is the first end portion 11a
  • the end portion on the second main surface 12 side of the second cross section CS 2 is the second end portion 12a
  • the first end portion 11a side and the second end portion are used.
  • the void ratio of the first end portion 11a is smaller than the void ratio of the central portion 13 and is the first.
  • the void ratio of the two end portions 12a is smaller than the void ratio of the central portion 13. Therefore, in the porous body 10a, a large amount of fluid can be retained and stored inside.
  • the porous body is cut perpendicular to the first main surface of the porous body to obtain a second cross section.
  • the second cross section is photographed by SEM.
  • the end portion on the first main surface side is the first end portion (the portion of the line indicated by the reference numeral "11a" in FIG. 3)
  • the end portion on the second main surface side is the second end portion (in FIG. 3).
  • FIG. 3 it is the portion of the line indicated by the reference numeral “12a”).
  • a line is drawn to bisect the porous body so as to bisect the first end side and the second end side. That portion is defined as the central portion of the porous body (the portion of the line indicated by the reference numeral “13” in FIG. 3).
  • a continuous region having an arbitrary width of 100 ⁇ m at the first end is selected.
  • the obtained image was binarized between the base material portion and the void portion by image processing, the distance between the void portions in the selected region (distance indicated by the broken line in FIG. 2) was measured, and the total length (100 ⁇ m) of the selected region was measured. ) Is calculated, and the value is used as the porosity of the first end portion.
  • the porosity at the center and the porosity at the second end are calculated by the same method.
  • the porosity of the first end portion 11a is preferably 30% or more and 50% or less. If the porosity of the first end is less than 30%, the pores are too small and the fluid is less likely to flow in and out of the porous body. If the porosity of the first end exceeds 50%, the strength of the porous body decreases and it becomes easy to break. In addition, the capillary force becomes low, and the liquid transport capacity tends to decrease.
  • the porosity of the second end portion 12a is preferably 30% or more and 50% or less. If the porosity of the second end is less than 30%, the pores are too small and the fluid is less likely to flow in and out of the porous body. If the porosity of the second end exceeds 50%, the strength of the porous body decreases and it becomes easy to break.
  • the porosity of the first end portion 11a and the porosity of the second end portion 12a may be the same or different.
  • the porosity of the central portion 13 is preferably 40% or more and 80% or less. If the porosity in the central portion is less than 40%, it becomes difficult to retain and store the fluid inside the porous body. If the porosity in the central portion exceeds 80%, the strength of the porous body is lowered and it is easily damaged.
  • the difference between the value of the porosity of the central portion 13 and the value of the porosity of the first end portion 11a is preferably 10% or more, and more preferably 20% or more and 30% or less. If the difference between the value of the porosity in the central portion and the value of the porosity in the first end portion is less than 10%, it becomes difficult to obtain the effect of retaining and storing the fluid in the porous body.
  • the difference between the value of the porosity in the central portion and the value of the porosity in the second end portion 12a is preferably 10% or more, and more preferably 20% or more and 30% or less. If the difference between the value of the porosity in the central portion and the value of the porosity in the second end is less than 10%, it becomes difficult to obtain the effect of retaining and storing the fluid in the porous body.
  • the difference between the porosity value of the central portion 13 and the porosity value of the first end portion 11a is 10% or more, and the porosity value of the central portion 13 and the second end portion 11a. It is more preferable that the difference from the value of the porosity of the end portion 12a is 10% or more.
  • the porous body 10a has the same structure as the above-mentioned porous body 10 of the present invention.
  • the cross section obtained by cutting the porous body 10 into two equal parts perpendicular to the direction from the first main surface 11 to the second main surface 12 is the first cross section CS of the porous body 10.
  • the porosity of the first main surface 11 is smaller than the porosity of the first cross section CS 1
  • the porosity of the second main surface 12 is larger than the porosity of the first cross section CS 1 . Small is preferable.
  • the heat dissipation structure according to the third embodiment of the present invention is a gas-liquid exchange type heat dissipation structure including a housing having an internal space, an operating medium enclosed in the internal space, and a wick enclosed in the internal space.
  • the wick includes the above-mentioned porous body of the present invention.
  • FIG. 3 is a cross-sectional view schematically showing an example of a heat dissipation structure according to a third embodiment of the present invention.
  • the heat dissipation structure 100 shown in FIG. 3 is a gas-liquid exchange type heat dissipation structure including a housing 130, an operating medium 150 enclosed in an internal space 140, and a porous body 110 enclosed in an internal space 140. be.
  • the porous body 110 functions as a wick.
  • the housing 130 is composed of, for example, the facing first sheet 131 and the second sheet 132 to which the outer edges are joined.
  • the first sheet 131 forms the upper surface
  • the second sheet 132 forms the bottom surface.
  • the convex portion 132a is formed on the inner wall surface of the second sheet 132.
  • a "convex portion” means a portion having a height relatively higher than the surroundings, and is relative to a portion protruding from the inner wall surface and a concave portion formed on the inner wall surface, for example, a groove. Including the part where the height is high.
  • the porous body 110 has a first main surface 111 as an upper surface and a second main surface 112 as a bottom surface, and has a plurality of pores 120. Further, some of the pores 120 are communication holes 121 that communicate the first main surface 111 and the second main surface 112, and the porosity of the first main surface 111 is the porosity of the first cross section of the porous body 110. It is smaller than the porosity, and the porosity of the second main surface 112 is smaller than the porosity of the first cross section of the porous body 110. That is, the porous body 110 is the porous body according to the first embodiment of the present invention. The porous body 110 may be the porous body according to the second embodiment of the present invention.
  • the first main surface 111 of the porous body 110 faces the inner wall surface of the first sheet 131, and the second main surface 112 faces the inner wall surface of the second sheet 132.
  • Porous body 110 is arranged.
  • the liquid phase working medium 150 is held between the inner wall surface of the second sheet 132 and the second main surface 112, specifically, between the convex portions 132a and the convex portions 132a.
  • the second main surface 112 is a liquid holding surface. Further, a part of the working medium 150 of the liquid phase has penetrated into the inside of the porous body 110 from the second main surface 112.
  • the heat radiating structure 100 for example, the second sheet 132 is the heat receiving portion and the first sheet 131 is the heat radiating portion.
  • the working medium 150 of the liquid phase becomes a gas phase and moves to the inner wall surface of the first sheet 131.
  • the working medium 150 of the gas phase releases heat and returns to the liquid phase.
  • the capillary phenomenon it reaches the inner wall surface of the second sheet 132, which is the heat receiving portion, through the communication hole 121 of the porous body 110.
  • the liquid working medium 150 that has reached the inner wall surface of the second sheet 132 receives heat and becomes a gas phase again.
  • the heat dissipation structure 100 can independently transfer heat in the form of latent heat of the working medium without using external power.
  • the porous body 110 is the porous body according to the first embodiment of the present invention, many working media 150 can be held and stored inside the porous body 110. Therefore, in the heat dissipation structure 100, dryout is unlikely to occur in the heat receiving portion. Further, since the porosity of the first main surface 111 and the second main surface 112 of the porous body 110 is smaller than the porosity of the first cross section of the porous body 110, the liquid can be transported with high capillary force. can.
  • the height H 1 of the housing 130 is preferably 0.2 mm or more and 0.5 mm or less.
  • the first sheet 131 and the second sheet 132 are not particularly limited as long as they have characteristics suitable for use as a housing, such as thermal conductivity, strength, and flexibility.
  • the first sheet 131 and the second sheet 132 are preferably metals, and examples thereof include copper, nickel, aluminum, magnesium, titanium, iron, and the like, or alloys containing them as main components.
  • the first sheet 131 and the second sheet 132 may be made of different materials. For example, by using a high-strength material for the first sheet 131, the stress applied to the housing 130 can be dispersed. Further, by using different materials for both, one sheet can obtain one function and the other sheet can obtain another function.
  • the above-mentioned functions are not particularly limited, and examples thereof include a heat conduction function and an electromagnetic wave shielding function.
  • the thickness of the first sheet 131 and the second sheet 132 is not particularly limited, but if the first sheet 131 and the second sheet 132 are too thin, the strength of the housing 130 is lowered and deformation is likely to occur. Therefore, the thickness of the first sheet 131 and the second sheet 132 is preferably 20 ⁇ m or more, more preferably 30 ⁇ m or more, respectively. On the other hand, if the first sheet 131 and the second sheet 132 are too thick, it becomes difficult to reduce the thickness of the heat dissipation structure 100. Therefore, the thickness of the first sheet 131 and the second sheet 132 is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and further preferably 100 ⁇ m or less. The thicknesses of the first sheet 131 and the second sheet 132 may be the same or different.
  • the thickness of the first sheet 131 may be constant, or there may be a thick portion and a thin portion.
  • the thickness of the second sheet 132 may be constant, or there may be a thick portion and a thin portion.
  • the convex portion 132a formed on the inner wall surface of the second sheet 132 preferably has a columnar shape, and more preferably a columnar shape.
  • the convex portion 132a may be formed by adhering a columnar structure to the inner wall surface of the second sheet 132. Further, when the second sheet 132 is made of metal, it may be formed by press working.
  • the method of joining the first sheet 131 and the second sheet 132 is not particularly limited, but laser welding, resistance welding, diffusion welding, brazing, TIG welding (tungsten-inert gas welding), ultrasonic bonding, resin encapsulation, etc. Can be mentioned. Of these, laser welding, resistance welding or brazing is preferred.
  • the working medium 150 is not particularly limited as long as it can cause a gas-liquid phase change in the environment inside the housing 130, and for example, water, alcohols, CFC substitutes, or the like can be used.
  • the working medium 150 is preferably an aqueous compound, more preferably water.
  • the thickness H 2 of the porous body 110 is preferably adjusted according to the height of the housing 130 and the amount of the working medium 150, and is preferably 0.01 mm or more and 0.1 mm or less, for example.
  • the heat dissipation structure as shown in the third embodiment of the present invention can be mounted on an electronic device for the purpose of heat dissipation.
  • electronic devices include smartphones, tablet terminals, notebook computers, game devices, wearable devices, and the like.
  • the heat radiating structure 100 operates independently without requiring external power, and can diffuse heat two-dimensionally at high speed by utilizing the latent heat of vaporization and the latent heat of condensation of the working medium. Therefore, the electronic device provided with the heat dissipation structure 100 can effectively realize heat dissipation in the limited space inside the electronic device.
  • the electronic device using the heat dissipation structure of the present invention is also the electronic device of the present invention.
  • the heat dissipation structure according to the fourth embodiment of the present invention is a gas-liquid exchange type heat dissipation structure including a housing having an internal space, an operating medium enclosed in the internal space, and a wick enclosed in the internal space.
  • the wick includes the above-mentioned porous body of the present invention.
  • FIG. 4 is a perspective view schematically showing an example of a heat dissipation structure according to a fourth embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of the heat dissipation structure shown in FIG. 4 along the IV-IV line.
  • FIG. 6 is a cross-sectional view taken along the line VV of the heat dissipation structure shown in FIG.
  • the heat dissipation structure 200 shown in FIGS. 4 and 5 is a gas-liquid exchange type heat dissipation structure including a housing 230, an operating medium 250 enclosed in an internal space 240, and a porous body 210 enclosed in an internal space 240. It is a structure.
  • the porous body 210 functions as a wick.
  • the housing 230 is provided with an evaporation unit EP that evaporates the enclosed working medium 250.
  • the housing 230 may further be provided with a condensation portion CP that condenses the evaporated working medium 250.
  • a heat source HS is arranged on the outer wall surface of the housing 230.
  • the heat source HS include electronic components of electronic devices, such as a central processing unit (CPU).
  • CPU central processing unit
  • the portion near the heat source HS and heated by the heat source HS corresponds to the evaporation portion EP.
  • the portion away from the evaporation portion EP corresponds to the condensation portion CP.
  • the evaporated working medium 50 can be condensed other than the condensed portion CP.
  • the portion where the evaporated working medium 250 is particularly easy to condense is expressed as the condensing portion CP.
  • the heat dissipation structure 200 is planar as a whole. That is, the housing 230 is planar as a whole.
  • the "plane” includes a plate shape and a sheet shape, and the dimension in the width direction X (hereinafter referred to as "width") and the dimension in the length direction Y (hereinafter referred to as "length”) are in the thickness direction Z. It means a shape that is considerably larger than a dimension (hereinafter referred to as a thickness or a height), for example, a shape having a width and a length of 10 times or more, preferably 100 times or more the thickness.
  • the housing 230 is composed of, for example, the facing first sheet 231 and the second sheet 232 to which the outer edges are joined.
  • the first sheet 231 forms the upper surface and the second sheet 232 forms the bottom surface.
  • the porous body 210 is a side surface 213 other than the first main surface 211 and the second main surface 212, and is in contact with each of the first sheet 231 and the second sheet 232 and is supported from the inside. ..
  • the porous body 210 By arranging the porous body 210, it is possible to absorb the impact from the outside of the housing 230 while ensuring the mechanical strength of the housing 230.
  • the porous body 210 is a porous body having a first main surface 211 and a second main surface 212, and having a plurality of pores 220. Further, some of the pores 220 are communication holes 221 that communicate the first main surface 211 and the second main surface 212, and the porosity of the first main surface 211 is the porosity of the first cross section of the porous body 210. It is smaller than the porosity, and the porosity of the second main surface 212 is smaller than the porosity of the first cross section of the porous body 210. That is, the porous body 210 is the porous body according to the first embodiment of the present invention. The porous body 210 may be the porous body according to the second embodiment of the present invention.
  • the height H3 of the housing 230 is preferably 0.2 mm or more and 0.5 mm or less.
  • a steam flow path C2 for moving the vapor from the evaporation section EP to the condensation section CP is formed.
  • a porous body 210 is located between the liquid flow path C 1 and the steam flow path C 2 , and the liquid flow path C 1 is formed by the first main surface 211, and the steam flow path C 2 Is formed by the second main surface 212. Further, as shown in FIG.
  • the liquid flow path C1 is one flow path in the condensing section CP, but is divided into a plurality of tributaries on the way from the condensing section CP to the evaporation section EP. ing.
  • the working medium 250 of the liquid phase can be efficiently moved to the evaporation unit EP.
  • the porous body 210 has pores 220, and a part of the pores 220 is a communication hole 221 that communicates the first main surface 211 and the second main surface 212. Therefore, the working medium 250 of the liquid phase can move from the first main surface 211 to the second main surface 212 through the communication hole 221. Further, a part of the pores 220 communicates with the porous body 210 so that the working medium 250 of the liquid phase can move inside the porous body 210 from the condensed portion CP to the evaporated portion EP. Is preferable.
  • the width W 1 of the liquid flow path C 1 of the working medium 250 is narrower than the width W 2 of the vapor flow path C 2 . Further, it is preferable that the width W 1 is 50 ⁇ m or more and 500 ⁇ m or less, and the width W 2 is 1000 ⁇ m or more and 3000 ⁇ m or less.
  • the widths of the widest portions are defined as the width W 1 and the width W 2 , respectively.
  • the working medium 250 of the liquid phase located in the liquid flow path C1 is heated through the inner wall surface of the housing 230 and changed to the gas phase.
  • the pressure of the gas in the steam flow path C2 in the vicinity of the evaporation portion EP increases.
  • the working medium 250 of the gas phase moves in the steam flow path C 2 toward the condensed portion CP side.
  • the working medium 250 of the gas phase that has reached the condensing portion CP is deprived of heat through the inner wall surface of the housing 230 and is condensed to become a liquid phase.
  • the working medium 250 of the gas phase can be condensed other than the condensed portion CP.
  • the working medium 250 of the liquid phase penetrates into the pores 220 of the porous body 210 by the capillary force. Further, a part of the working medium 250 of the liquid phase that has penetrated into the pores 220 of the porous body 210 flows into the liquid flow path C1.
  • the working medium 250 of the liquid phase in the pores of the porous body 210 and in the liquid flow path C1 moves to the evaporation part EP side by the capillary force. Then, the working medium 250 of the liquid phase is supplied from the pores of the porous body 210 and the liquid flow path C1 to the evaporation unit EP. The working medium 250 of the liquid phase that has reached the evaporation unit EP evaporates again in the evaporation unit EP. In this way, in the heat dissipation structure 200, the working medium 250 can be circulated from the evaporation unit EP to the condensation unit CP without using external power. That is, the heat dissipation structure 200 can independently transfer heat in the form of latent heat of the working medium. As shown in FIG.
  • the evaporating unit EP may include the liquid flow path C 1 and the porous body 210, or may contain only the porous body 210 without the liquid flow path C 1 or the liquid flow path. C 1 and the porous body 210 may not be contained.
  • porous body 210 is the porous body according to the first embodiment of the present invention, many working media 250 can be held and stored inside the porous body 210. Therefore, in the heat dissipation structure 200, dryout is unlikely to occur in the evaporation portion EP.
  • the preferred materials and shapes of the housing 230, the first sheet 231 and the second sheet 232 and the working medium 250 are the same as the preferred materials and shapes of the housing 130, the first sheet 131, the second sheet 132 and the working medium 150. Is.
  • the shape of the porous body 210 was rectangular.
  • the shape of the cross section of the porous body 210 may be a quadrangle such as a square or a trapezoid, a concave lens-like shape with a concave center portion, or a convex lens. It may have a shape in which the central portion bulges.
  • the liquid flow path C 1 and the steam flow path C 2 are formed in a straight line.
  • the shape and number of the liquid flow path C1 and the steam flow path C2 will be changed. It is not particularly limited, and it is preferable to set it appropriately according to the shape of the heat dissipation structure and the like.
  • the liquid flow path C1 is divided into a plurality of tributaries on the way from the condensing portion CP to the evaporating portion EP.
  • the number of liquid flow paths C1 may be one or a plurality.
  • a plurality of liquid flow paths C1 may be branched and / or merged in the middle, and the plurality of liquid flow paths C1 may be independent of each other.
  • the number of steam flow paths C2 may be one or a plurality. Further, a plurality of steam flow paths C 2 may be branched and / or merged in the middle, and the plurality of steam flow paths C 2 may be independent of each other.
  • FIG. 7 is a cross-sectional view perpendicular to the Z-axis direction of the heat dissipation structure schematically showing another example of the internal structure of the heat dissipation structure according to the fourth embodiment of the present invention.
  • the liquid flow path C1 and the steam flow path C2 are porous so as to be formed only in the outer peripheral portion of the internal space of the housing 230.
  • the plaque 210 is arranged.
  • FIG. 8 is a cross-sectional view perpendicular to the Z-axis direction of the heat dissipation structure schematically showing still another example of the internal structure of the heat dissipation structure according to the fourth embodiment of the present invention.
  • the liquid flow path C1 and the steam flow path C2 are porous so as to be formed only in the central portion of the internal space of the housing 230.
  • the plaque 210 is arranged.
  • the heat dissipation structure according to the fifth embodiment of the present invention has the same structure as the heat dissipation structure 200 shown in FIGS. 4 to 6 except that the structure around the liquid flow path is replaced as follows.
  • FIG. 9 is a cross-sectional view perpendicular to the Y-axis direction of the heat dissipation structure according to the fifth embodiment of the present invention.
  • FIG. 10 is an enlarged view of the broken line portion of FIG.
  • the pair of supports 80 are arranged so as to be in contact with the second sheet 232.
  • the porous body 210' is arranged so as to cover the pair of supports 80 and to be in contact with the first sheet 231.
  • the liquid flow path C1 is formed in a space surrounded by the second sheet 232, the pair of supports 80, and the porous body 210'.
  • the first main surface 211 of the porous body 210' is in contact with the first sheet 231 and the second main surface 212 is in contact with the support 80.
  • the porous body 210' has a plurality of pores 220, and some of the pores 220 are communication holes that communicate the first main surface 211 and the second main surface 212. It is 221. Further, the porosity of the first main surface 211 is smaller than the porosity of the first cross section of the porous body 210, and the porosity of the second main surface 212 is the porosity of the first cross section of the porous body 210. Smaller than.
  • the communication hole 221 also communicates with the side surface 210s of the porous body 210'. That is, the porous body 210'is the porous body according to the first embodiment of the present invention, which has a communication hole that also communicates with the side surface.
  • the porous body 210' may be the porous body according to the second embodiment of the present invention, which also has a communication hole communicating with the side surface.
  • the orientation of the porous body 210' is not particularly limited, and the first main surface 211 of the porous body 210'is arranged so as to be in contact with the support 80.
  • the first main surface 211 of the porous body 210' may be arranged so as to be in contact with the steam flow path C2 .
  • the material forming the support 80 is not particularly limited, and examples thereof include resins, metals, ceramics, mixtures thereof, and laminates. Further, the support 80 may be integrated with the housing 230, and may be formed, for example, by etching the inner wall surface of the first sheet 231 or the second sheet 232.
  • the shape of the support 80 is not particularly limited, and may be composed of, for example, rail-shaped columns arranged along the direction in which the porous body 210'extends, and may be formed along the direction in which the porous body 210' extends. It may be composed of a plurality of columns arranged at intervals.
  • the heat dissipation structure as shown in the fourth embodiment and the fifth embodiment of the present invention can be mounted on an electronic device for the purpose of heat dissipation.
  • electronic devices include smartphones, tablet terminals, notebook computers, game devices, wearable devices, and the like.
  • the heat radiating structure 200 operates independently without requiring external power, and can diffuse heat two-dimensionally at high speed by utilizing the latent heat of vaporization and the latent heat of condensation of the working medium. Therefore, the electronic device provided with the heat dissipation structure 200 can effectively realize heat dissipation in the limited space inside the electronic device.
  • the electronic device using the heat dissipation structure of the present invention is also the electronic device of the present invention.
  • the porous body of the present invention can be used for devices that need to hold a liquid in the porous material, such as a wick of a heat dissipation structure and a battery separator.

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  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
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  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

L'invention concerne un corps poreux qui permet à un fluide, par exemple, un liquide, de se déplacer d'une surface à une autre surface et peut contenir et stocker une grande quantité de fluide. Ce corps poreux (10) présente une première surface principale (11), une seconde surface principale (12) qui est opposée à la première surface principale (11) et une pluralité de pores (20). Au moins une partie des pores (20) sont des pores de liaison (21) qui relient la première surface principale (11) et la seconde surface principale (12). Lorsqu'une première section transversale (CS1) est prise en coupant le corps poreux (10) perpendiculairement à la direction allant de la première surface principale (11) à la seconde surface principale (12), la porosité de la première surface principale (11) est inférieure à la porosité de la première section transversale CS1), et la porosité de la seconde surface principale (12) est également inférieure à la porosité de la première section transversale (CS1).
PCT/JP2021/036111 2020-10-06 2021-09-30 Corps poreux, structure de dissipation de chaleur et appareil électronique WO2022075172A1 (fr)

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JP2022555415A JP7231121B2 (ja) 2020-10-06 2021-09-30 多孔質体、放熱構造体及び電子機器
CN202190000731.XU CN220189633U (zh) 2020-10-06 2021-09-30 多孔体、散热构造体和电子设备

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007046089A (ja) * 2005-08-09 2007-02-22 Mitsubishi Materials Corp 高強度発泡チタン焼結体の製造方法
JP2016176135A (ja) * 2014-10-16 2016-10-06 三菱マテリアル株式会社 金属多孔質体
US20200221605A1 (en) * 2019-01-08 2020-07-09 Dana Canada Corporation Ultra thin two phase heat exchangers with structural wick

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007046089A (ja) * 2005-08-09 2007-02-22 Mitsubishi Materials Corp 高強度発泡チタン焼結体の製造方法
JP2016176135A (ja) * 2014-10-16 2016-10-06 三菱マテリアル株式会社 金属多孔質体
US20200221605A1 (en) * 2019-01-08 2020-07-09 Dana Canada Corporation Ultra thin two phase heat exchangers with structural wick

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