JP2019176091A - Radiator fin, radiator, and method of manufacturing the same - Google Patents

Abstract

To provide a radiator fin with high heat dissipation and high corrosion resistance, radiator and cooling device, and a method of manufacturing the radiator with high heat dissipation and high corrosion resistance.SOLUTION: A radiator fin 2 has a core part 22 made of an aluminum-carbon particle composite material 25 and a sacrificial corrosion material layer 23 as a skin material layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radiating fin, a radiator and a cooling device for radiating heat from a heating element such as an electronic component, and a method for manufacturing the radiator.

  In the present specification and claims, the term “aluminum” is used to include both pure aluminum and aluminum alloys, unless otherwise specified in the text.

  As an aluminum-carbon particle composite material, a material containing an aluminum matrix and carbon particles dispersed in the aluminum matrix is known. As a document disclosing such a composite material, Japanese Patent No. 5150905 (Patent Document 1), Japanese Patent Application Laid-Open No. 2015-25158 (Patent Document 2), Japanese Patent Application Laid-Open No. 2015-217655 (Patent Document 3), No. 2017-88913 (Patent Document 4).

  Such a composite material has high thermal conductivity, and therefore, it is expected to be used as a material for a member that requires high thermal conductivity.

  By the way, a radiator that dissipates heat from a heating element such as a heat-generating element generally includes a radiation fin. The heat dissipating fins are required to have high thermal conductivity in order to enhance the heat dissipating performance. Therefore, it is conceivable to use an aluminum-carbon particle composite material as a material for the heat radiation fin. For example, Japanese Patent Laying-Open No. 2017-220539 (Patent Document 5) discloses a heat sink made of an aluminum-carbon particle composite material in which heat dissipating fins are integrally provided on a base plate as a heat radiator.

Japanese Patent No. 5150905 Japanese Patent Laying-Open No. 2015-25158 JP2015-217655A JP 2017-88913 JP 2017-220539 A

  In order to extend the service life of the radiator, it is desirable that the corrosion resistance of the radiating fins with respect to the cooling fluid is as high as possible.

  Then, an object of this invention is to provide the manufacturing method of the heat radiating fin which has high heat dissipation and high corrosion resistance, a heat radiator, and a cooling device, and high heat dissipation and high corrosion resistance.

  The present invention provides the following means.

  1) A heat radiation fin having a core part made of an aluminum-carbon particle composite material and a sacrificial corrosion material layer as a skin material layer.

2) The sacrificial corrosive material layer is made of a metal material that is potentially base with respect to the core material portion,
2. The radiation fin according to item 1, wherein an Al—Zn alloy, an Al—In alloy, or an Al—Sn alloy is used as the metal material.

  3) The heat radiation fin according to the above item 1, wherein the sacrificial corrosion material layer is made of an aluminum-carbon particle composite material that is lower in potential than the core material portion.

  4) A radiator including the radiation fin according to any one of items 1 to 3.

5) A base plate is further provided,
A plurality of the heat dissipating fins;
The radiator according to the preceding item 4, wherein the plurality of heat radiation fins are provided in a protruding shape on the base plate.

6) It further includes a rod-shaped connecting member,
A plurality of the heat dissipating fins;
Each said radiation fin is plate shape,
The radiator according to item 4, wherein the plurality of heat dissipating fins are connected and integrated via the connecting member in a state of being arranged in parallel.

7) comprising the radiator according to the preceding item 5 and a casing having a bottom wall and a peripheral wall and formed in a container shape opened upward, and provided with a cooling fluid flow path therein.
A cooling device in which an outer peripheral edge portion of a base plate of the radiator is joined to an upper edge portion of the peripheral wall of the casing in a state where a plurality of radiating fins of the radiator are arranged inside the casing.

8) A method of manufacturing a radiator, comprising forming a radiator including a base plate and a plurality of fins integrally formed in a protruding manner on the base plate by plastic processing a plastic working material,
Preparing a plastic working material having a plate-like core material portion made of an aluminum-carbon particle composite material and a sacrificial corrosion material layer as a skin material layer bonded to the core material portion;
The plastic working material is plastic processed so that the material on the core part side of the plastic working material has a shape of a base plate and the material on the sacrificial corrosion material layer side of the plastic working material protrudes at a plurality of locations. By this, the manufacturing method of the heat radiator which forms a base plate and several heat radiation fins are integrally formed in the said base plate at the same time.

9) The core part of the plastic working material is formed by sintering a sintered material,
By sintering the sintered material in a state where the sacrificial corrosive material layer is in contact with the sintered material, the sacrificial corrosive material layer is sintered and joined to the core material portion at the same time as forming the core material portion. The manufacturing method of the heat radiator of the preceding clause 8 which obtains the said plastic working material by this.

10) The core part of the plastic working material is formed by sintering a first sintered material,
The sacrificial corrosion material layer is formed by sintering the second sintered material,
The core material portion and the sacrificial corrosive material layer are formed simultaneously by sintering the first sintered material and the second sintered material in contact with each other, and at the same time, the sacrificial corrosive material is formed on the core material portion. The method for manufacturing a radiator according to the preceding item 8, wherein the layers are sintered and bonded to obtain the plastically processed material.

  The present invention has the following effects.

  In the preceding item 1, since the radiation fin has a core part made of an aluminum-carbon particle composite material, it has high heat dissipation. Furthermore, since the radiation fin has a sacrificial corrosion material layer, it has high corrosion resistance.

  In the preceding item 2, since the Al—Zn alloy, Al—In alloy, or Al—Sn alloy is used as the sacrificial corrosion material layer, the corrosion resistance of the radiation fin can be reliably increased.

  In the preceding paragraph 3, the sacrificial corrosive material layer is made of an aluminum-carbon particle composite material that is lower in potential with respect to the core material portion, so that the heat dissipation and corrosion resistance of the heat dissipation fins can be further improved.

  In the preceding items 4 to 6, a radiator having high heat dissipation and high corrosion resistance can be provided.

  In the preceding item 7, a cooling device having high heat dissipation and high corrosion resistance can be provided.

  In the previous item 8, a radiator having high heat dissipation and high corrosion resistance can be easily manufactured.

  In the preceding items 9 and 10, the number of manufacturing steps of the plastic working material can be reduced.

FIG. 1 is a schematic cross-sectional view of a module substrate for an exothermic element including a cooling device according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a forging material (plastic processing material) for forming the radiator of the cooling device by forging processing (plastic processing). FIG. 3 is a schematic cross-sectional view illustrating a method for manufacturing the forged material. FIG. 4 is a schematic cross-sectional view showing the forging material before being pressed by the pressing punch of the forging device. FIG. 5: is a schematic sectional drawing shown in the state which pressed the forge processing raw material with the same press punch. FIG. 6 is a schematic cross-sectional view of a forging material (plastic working material) for forming the radiator of the cooling device according to the second embodiment of the present invention by forging processing (plastic processing). FIG. 7 is a schematic cross-sectional view illustrating a method for manufacturing the forged material. FIG. 8 is a schematic perspective view of a radiator according to the third embodiment of the present invention. FIG. 9 is a schematic enlarged cross-sectional view of the heat radiating fin of the heat radiator.

  Several preferred embodiments of the present invention will be described below with reference to the drawings.

  1-5 is a figure explaining 1st Embodiment of this invention.

  As shown in FIG. 1, the cooling device 10 according to the first embodiment is provided on a module substrate 50 for a heat generating element (indicated by a two-dot chain line) 55. The exothermic element 55 is a semiconductor element such as a power semiconductor element, for example.

  Here, the vertical direction of the module substrate 50 and the cooling device 10 is not limited. However, in the present specification and claims, in order to facilitate understanding of these configurations, as shown in FIG. The side on which the conductive element 55 is mounted is defined as the upper side of the module substrate 50 and the cooling device 10, and the opposite side is defined as the lower side of the module substrate 50 and the cooling device 10.

  The module substrate 50 includes a wiring layer 51, an insulating layer 52, a first buffer layer 53, a second buffer layer 54, and the above-described cooling device 10, which are stacked in this order from top to bottom. The module substrate 50 is formed by joining and integration in a state by a predetermined joining means (eg, brazing, sintering).

  The exothermic element 55 is mounted on the mounting surface 51 a formed from the upper surface of the wiring layer 51 by being joined with a solder layer (not shown). When the exothermic element 55 is a semiconductor element, the semiconductor element module 57 is formed by mounting the semiconductor element on the mounting surface 51a.

  The wiring layer 51 is made of metal, for example. The insulating layer 52 has electrical insulation, and is made of, for example, ceramic. The first buffer layer 53 and the second buffer layer 54 are layers for relaxing stress such as thermal stress generated in the module substrate 50. The first buffer layer 53 is made of metal, for example. The second buffer layer 54 is made of metal, for example, and is made of a double-sided aluminum brazing sheet.

  The cooling device 10 includes the radiator 1 according to the first embodiment of the present invention and a metal casing 11.

  The radiator 1 has a so-called heat sink shape, and more specifically includes a base plate 3 and a plurality of radiation fins 2 according to the first embodiment of the present invention.

  The radiating fins 2 are integrally formed on a predetermined surface of the base plate 3 so as to protrude from the base plate 3. The predetermined surface of the base plate 3 is, for example, at least one surface of both surfaces of the base plate 3 in the thickness direction. In the first embodiment, the predetermined surface of the base plate 3 is one of the two surfaces in the thickness direction of the base plate 3, and the one surface faces the casing 11 side.

  The other side of the base plate 3 is formed flat. The second buffer layer 54 is bonded to the other side of the base plate 3.

  Each radiating fin 2 has a pin shape, and its cross-sectional shape is a circular shape, a polygonal shape (for example, a square shape), or the like.

  The casing 11 has a substantially rectangular bottom wall 11a in plan view and a peripheral wall 11b formed upright on the outer peripheral edge of the bottom wall 11a and is open upward. More specifically, the casing 11 is formed by bending a single-sided aluminum brazing sheet into a container shape, and the brazing filler metal layer 11 c of the single-sided aluminum brazing sheet faces the inside of the casing 11.

  A cooling fluid channel 12 is provided inside the casing 11. A cooling fluid (not shown) is circulated through the cooling fluid channel 12. As the cooling fluid, a cooling liquid (for example, cooling water), a cooling gas (for example, cooling air), or the like is used. In the first embodiment, for example, a cooling liquid is used.

  The outer peripheral edge of the base plate 3 of the radiator 1 is hermetically sealed with respect to the casing 11 with the radiating fins 2 of the radiator 1 disposed inside the casing 11 at the upper edge of the peripheral wall 11 b of the casing 11. The brazing material layer 11c is brazed and joined. Thereby, the upper opening of the casing 11 is closed by the base plate 3. Further, the tips of the radiation fins 2 are brazed to the inner surface of the bottom wall 11a of the casing 11 with a brazing material layer 11c.

  A method for manufacturing the radiator 1 will be described below.

  As shown in FIGS. 2 to 5, the radiator 1 is formed by plastic working a plate-shaped plastic working material 20. In the first embodiment, the plastic working to the plastic working material 20 is forging, and the plastic working material 20 is the forging material 21 in detail.

  As shown in FIG. 2, the forging material 21 (plastic working material 20) includes a plate-shaped core member 22 made of an aluminum-carbon particle composite material 25 and a sacrificial rot as a skin layer joined to the core member 22. The food material layer 23 is included as a material of the forging material 21.

  The sacrificial corrosion material layer 23 is sintered and bonded to a predetermined surface of the core material portion 22 over the entire surface. In the first embodiment, the predetermined surface of the core material portion 22 is a surface of the core material portion 22 on the side where the radiation fins 2 are formed.

  The aluminum-carbon particle composite material 25 of the core part 22 includes an aluminum matrix (indicated by dot hatching) 25a and a large number of carbon particles 25b, and is also called an aluminum-based carbon particle composite material. . In the first embodiment, the carbon particles 25b are dispersed in the aluminum matrix 25a.

  The type of the carbon particles 25b is not limited, and in particular, carbon fibers (eg, PAN-based carbon fibers, pitch-based carbon fibers), natural graphite particles (eg: scaly graphite particles), graphene (eg: single-layer graphene) , Multi-layer graphene) and carbon nanotubes (eg, single-wall carbon nanotubes, multi-wall carbon nanotubes, vapor-grown carbon fibers) are preferably used as the carbon particles 25b. The reason is that such carbon particles 25b have high thermal conductivity and can be easily combined with aluminum.

  The magnitude | size of the carbon particle 25b is not limited, Usually, the average length of the longest axial direction of the carbon particle 25b is the range of 1 micrometer-1 mm.

  The sacrificial corrosive material layer 23 is made of a metal material that is lower in potential than the core member 22 (more specifically, the aluminum matrix 25a of the aluminum-carbon particle composite material 25 of the core member 22). As the metal material, it is particularly preferable to use an Al—Zn alloy, an Al—In alloy, or an Al—Sn alloy. In this case, the sacrificial corrosive action of the sacrificial corrosive material layer 23 can be surely exhibited.

  The Zn content of the Al—Zn-based alloy is not limited and is particularly preferably in the range of 0.3 to 5 mass%. When the Zn content is 0.3% by mass or more, the sacrificial corrosion action can be more reliably exhibited. When the Zn content is 5% by mass or less, the sacrificial corrosion action can be reliably maintained over a long period of time.

  The In content of the Al—In alloy is not limited, and is preferably in the range of 0.01 to 0.5 mass%. When the Zn content is 0.01% by mass or more, the sacrificial corrosion action can be more reliably exhibited. When the Zn content is 0.5% by mass or less, the sacrificial corrosion action can be reliably maintained over a long period of time.

  The Sn content of the Al—Sn alloy is not limited, and is particularly preferably in the range of 0.01 to 1% by mass. When the Sn content is 0.01% by mass or more, the sacrificial corrosion action can be more reliably exhibited. When the Sn content is 1% by mass or less, the sacrificial corrosion action can be reliably maintained over a long period of time.

  As the aluminum matrix 25a of the aluminum-carbon particle composite material 25 of the core member 22, the sacrificial corrosive material layer 23 (specifically, the above-described metal material that is a sacrificial corrosive material of the sacrificial corrosive material layer 23) is potential-wise. Noble aluminum material is used.

  In the case where the sacrificial corrosion material layer 23 is made of an Al—Zn alloy, an Al—In alloy, or an Al—Sn alloy, in order to reliably exert the sacrificial corrosion action of the sacrificial corrosion material layer 23, As the aluminum matrix 25a, it is particularly desirable to use high-purity aluminum (for example, purity of 3N or more), pure aluminum-based alloys (for example: A1100, A1050, A1N30) or Al—Mn-based alloys (for example: A3003, A3203).

  A method for manufacturing the forged material 21 will be described below.

  As shown in FIG. 3, the core part 22 of the forging material 21 is formed by sintering a plate-shaped sintered material 30.

  The sacrificial corrosive material layer 23 of the forged material 21 is formed of one or a plurality of sacrificial corrosive material layer forming plate materials 31 (including foil materials) arranged in a laminated manner. In the form, the number of plate members 31 is one.

  The sintered material 30 is composed of a plate-like laminate 35 formed by laminating a plurality of preform foils 34 formed by attaching a large number of carbon particles 25 b on an aluminum foil 33. The carbon particles 25b are attached to the aluminum foil 33 with, for example, a resin binder (not shown).

  The aluminum material of the aluminum foil 33 of the preform foil 34 forms the aluminum matrix 25a of the composite material 25.

  The number of the preform foils 34 stacked is set according to the thickness of the core member 22 and is not limited, and is, for example, 3 to 500,000. In the drawing, the number of the preform foils 34 is set to four in order to facilitate understanding of the configuration of the sintered material 30 and the core material portion 22 and to limit the size of the drawing.

  When the forged material 21 is manufactured, the sacrificial corrosion material layer 23 is laminated on the sintered material 30 so as to be in surface contact with a predetermined surface of the sintered material 30. In the first embodiment, the predetermined surface of the sintered material 30 is a surface of the sintered material 30 on the side where the radiation fins 2 are formed.

  Then, both the sacrificial corrosive material layer 23 in the direction in which the sintered material 30 and the sacrificial corrosive material layer 23 are in close contact with each other by a predetermined sintering method in a state in which the sacrificial corrosive material layer 23 is laminated on the sintered material 30 as described above. The sintering material 30 is heated and sintered while pressurizing 23. As a result, the core part 22 of the forged material 21 is formed, and at the same time, the sacrificial corrosion material layer 23 is sintered and joined to a predetermined surface of the core part 22 over the entire surface. As a result, the above-described forged material 21 shown in FIG. 2 is obtained.

  The sintering method of the sintered material 30 is not limited, and it is particularly preferable to use a vacuum hot press sintering method or a discharge plasma sintering method. In this case, the sintered material 30 can be reliably sintered, and the sacrificial corrosion material layer 23 can be reliably sintered and joined to the core material portion 22.

  Preferred sintering conditions when the sintering method is a vacuum hot press sintering method are as follows.

  The sintering temperature is 450 to 640 ° C., the sintering time (that is, the holding time of the sintering temperature) is 10 to 300 min, and the final pressure on the sintered material 30 is 1 to 40 MPa.

  As shown in FIG. 2, in the core material portion 22 of the forged material 21, the composite material 25 is composed of an aluminum layer 27 composed of an aluminum matrix 25 a and carbon in which carbon particles 25 b are dispersed in the plane direction of the core material portion 22. The particle dispersion layers 28 are joined and integrated (sintered integration in detail) in a state where a plurality of particle dispersion layers 28 are alternately laminated.

  In addition, the plane direction of the core material part 22 and the forging material 21 is a surface direction perpendicular to the thickness direction of the core material part 22 and the forging material 21.

  Each aluminum layer 27 of the composite material 25 is mainly formed of the aluminum foil 33 of the preform foil 34.

  Each carbon particle dispersion layer 28 of the composite material 25 is formed by permeation of the aluminum material of the aluminum foil 33 between a large number of carbon particles 25 b attached on the aluminum foil 33.

  In the first embodiment, since the sacrificial corrosion material layer 23 is joined to the core material portion 22 at the same time as the sintering material 30 is sintered as described above, the sintered material 30 is sintered to form the core material portion 22. The number of manufacturing steps of the forged material 21 can be reduced as compared with the case where the forged material 21 is obtained by performing the step of forming and then the step of joining the sacrificial corrosion material layer 23 to the core member 22.

  In the present invention, the method of joining the sacrificial corrosion material layer 23 to the core member 22 is not limited to the above-described method, and may be, for example, a hot or cold rolling clad method, A joining method may be used.

  Furthermore, in this invention, the manufacturing method of the core part 22 of the forging raw material 21 (plastic processing raw material 20) is not limited to the above-mentioned method, For example, although not shown in figure, aluminum powder and carbon A method of producing a core part made of an aluminum-carbon particle composite material by heating and sintering a mixture with carbon powder as particles (this is referred to as “powder sintering method” for convenience of explanation), Other methods may be used.

  A method for manufacturing the radiator 1 using the forging material 21 will be described below.

  As shown in FIGS. 4 and 5, the radiator 1 is formed by forging a forging material 21 with a forging device 40.

  The forging process to the forging material 21 is, for example, a cold or hot forging process, and is particularly preferably a hot forging process. In this case, the molding pressure at the time of forging can be reduced, and a heat sink having a complicated shape can be reliably formed. In the first embodiment, the forging process is a hot forging process.

  As shown in FIG. 4, the forging device 40 is a die forging device in detail, and includes a female die 41 having a molding recess 41 a and a pressing punch 42 as a male die corresponding to the female die 41. Yes.

  The bottom surface 41b of the molding recess 41a of the female die 41 is formed flat. At least the front end portion of the pressing punch 42 can be fitted and fitted in the molding recess 41a. A plurality of radiating fin forming holes 43 are provided in the pressing surface 42 a formed of the tip surface of the pressing punch 42 so as to extend in the pressing axis direction of the forging device 40.

  When the forging material 21 is forged by the forging device 40, the forging material 21 is placed in the molding recess 41a of the female die 41 with the sacrificial corrosive material layer 23 facing the radiation fin forming hole 43 side as shown in FIG. Deploy.

  Then, the forging material 21 is pressed in the thickness direction of the forging material 21 by the pressing punch 42 from the sacrificial corrosion material layer 23 side while the forging material 21 is heated. As a result, as shown in FIG. 5, the material on the core material portion 22 side of the forging material 21 is in the shape of the base plate 3 of the radiator 1, and the material on the sacrificial corrosion material layer 23 side of the forging material 21 is The forging material 21 is forged so as to be plastically deformed (plastic flow) into the radiating fin forming holes 43 and project locally at the positions of the radiating fin forming holes 43.

  By forging the forging material 21 in this manner, the base plate 3 is formed, and at the same time, the plurality of heat radiation fins 2 are integrally formed on the base plate 3 so as to protrude from the base plate 3. As a result, the above-described radiator 1 is obtained.

  In addition, the arrow P in FIG. 5 has shown the press direction to the forging raw material 21 by the press punch 42. FIG. This pressing direction P coincides with the pressing axis direction of the forging device 40.

  In the radiator 1 thus obtained, the base plate 3 has a plate-shaped core material portion 22 made of the aluminum-carbon particle composite material 25 of the forging material 21 and a sacrificial corrosion material layer 23 of the forging material 21. Yes. The sacrificial corrosion material layer 23 is sintered and bonded to a predetermined surface of the core material portion 22. The predetermined surface of the core member 22 is a surface of the core member 22 on the side where the radiation fins 2 are formed.

  The radiating fin 2 is a core material of the forging material 21 when the material on the sacrificial corrosion material layer 23 side of the forging material 21 is plastically deformed (plastic flow) into the radiating fin formation hole 43 during the forging to the forging material 21. The sacrificial corrosion material layer 23 is formed on the core material protrusion 22a so as to cover the entire outer periphery of the core material protrusion 22a and the tip thereof, while the portion 22 has a core material protrusion 22a formed to protrude locally with respect to the base plate 3. Is provided.

  In the radiating fin 2, the thickness of the sacrificial corrosion material layer 23 is not limited, and is preferably 10 to 500 μm. When the thickness is 10 μm or more, the sacrificial corrosion action of the sacrificial corrosion material layer 23 can be reliably exhibited. When the thickness is 500 μm or less, the cost and time for forming the sacrificial corrosion material layer 23 can be reliably suppressed. Further, the lower limit of the desirable thickness is 15 μm, and the upper limit of the more desirable thickness is 300 μm.

  In the radiator 1, the heat radiating fin 2 has the core material protrusion 22 a made of the aluminum-carbon particle composite material 25 as the material of the heat radiating fin 2, and thus has high heat dissipation. Furthermore, since the base plate 3 and the heat radiating fin 2 have the sacrificial corrosion material layer 23 as a material for the base plate 3 and the heat radiating fin 2, they have high corrosion resistance against the cooling fluid. Therefore, the radiator 1 has high heat dissipation and high corrosion resistance.

  Therefore, as shown in FIG. 1, the cooling device 10 including the radiator 1 and the module substrate 50 including the cooling device 10 can effectively cool the heat generating element 55 and have a long service life. is doing.

  6 and 7 are diagrams for explaining a forging material for forming the radiator of the cooling device according to the second embodiment of the present invention by forging. In these drawings, elements having the same action as the elements of the forged material 21 of the first embodiment are denoted by reference numerals obtained by adding 100 to the reference numerals assigned to the elements of the forged material 21. The second embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 6, the core material part 122 of the forged material 121 is made of an aluminum-carbon particle composite material 125 (this is referred to as “first aluminum-carbon particle composite material 125”, similar to the core material part 22 of the first embodiment. It consists of).

  The sacrificial corrosive material layer 123 of the forged material 121 is an aluminum-carbon particle composite material 126 that is lower in potential than the core material portion 122 (more specifically, the aluminum matrix 125a of the first composite material 125 of the core material portion 122). (This is referred to as “second aluminum-carbon particle composite material 126”).

  The second composite material 126 includes an aluminum matrix 126a and a large number of carbon particles 126b. In the second embodiment, the carbon particles 126b are dispersed in the aluminum matrix 126a.

  The type of the carbon particles 126b is not limited, and for example, the carbon particles 126b may be the same or different from the carbon particles 125b of the first composite material 125. As the aluminum matrix 126a, an aluminum material that is lower in potential than the core member 122 (more specifically, the aluminum matrix 125a of the first composite material 125 of the core member 122) is used. As the aluminum material, it is particularly preferable to use an Al—Zn alloy, an Al—In alloy, or an Al—Sn alloy. In this case, the sacrificial corrosive action of the sacrificial corrosive material layer 23 can be surely exhibited.

  As the aluminum matrix 125a of the first composite material 125 of the core member 122, the sacrificial corrosion material layer 123 (specifically, the aluminum matrix 126a of the second composite material 126 that is a sacrificial corrosion material of the sacrificial corrosion material layer 123) is used. A potential noble aluminum material is used.

  Sacrificial corrosion action of the sacrificial corrosive layer 123 when an Al—Zn alloy, an Al—In alloy, or an Al—Sn alloy is used as the aluminum matrix 126 a of the second composite material 126 of the sacrificial corrosive layer 123. In order to reliably exhibit the above, as the aluminum matrix 125a of the first composite material 125, high-purity aluminum (eg, purity of 3N or higher), pure aluminum-based alloy (eg, A1100, A1050, A1N30) or Al—Mn-based alloy It is particularly desirable to use (Example: A3003, A3203).

  A method for manufacturing the forging material 121 will be described below.

  As shown in FIG. 7, the core member 122 is formed by sintering a plate-like first sintered material 130.

  The sacrificial corrosion material layer 123 is formed by sintering the plate-like second sintered material 136.

  The first sintered material 130 is formed by laminating a plurality of first preform foils 134 formed by attaching a large number of carbon particles 125b on the first aluminum foil 133, and further forming the first aluminum foil 133 without carbon particles attached thereto. It consists of the plate-shaped 1st laminated body 135 formed by laminating | stacking.

  The aluminum material of the first aluminum foil 133 forms the aluminum matrix 125a of the first composite material 125. Of these first aluminum foils 133, the aluminum material of the first aluminum foil 133 to which no carbon particles adhere is the surface of the core member 122 so that the carbon particles 125 b in the core member 122 do not fall off the surface of the core member 122. A protective layer for protecting the side is mainly formed.

  The second sintered material 136 is composed of a plate-like second laminated body 139 formed by laminating a plurality of second preform foils 138 formed by attaching a large number of carbon particles 126b on the second aluminum foil 137. .

  The aluminum material of the second aluminum foil 137 forms the aluminum matrix 126a of the second composite material 126. Therefore, the second aluminum foil 137 is made of an aluminum material that is lower in potential than the first aluminum foil 133.

  When the forging material 121 is manufactured, the second sintered material 136 is stacked on the first sintered material 130 so as to be in surface contact with a predetermined surface of the first sintered material 130. In the second embodiment, the predetermined surface of the first sintered material 130 is a surface of the first sintered material 130 on the side where the radiation fins 2 (see FIG. 1) are formed.

  The first sintered material 130 and the second sintered material 136 are brought into close contact with each other by a predetermined sintering method in a state where the second sintered material 136 is stacked on the first sintered material 130 as described above. The both 130 and 136 are heated and sintered together while pressurizing the both 130 and 136 in the direction to be pressed. As a result, the core material portion 122 is formed from the first sintered material 130 and the sacrificial corrosion material layer 123 is formed from the second sintered material 136, and at the same time, the sacrificial corrosion material layer 123 is baked over a predetermined surface of the core material portion 122. Bond together. As a result, the above-described forged material 121 shown in FIG. 6 is obtained.

  The sintering method of the first sintered material 130 and the second sintered material 136 is not limited, and it is particularly preferable to use a vacuum hot press sintering method or a discharge plasma sintering method.

  The forged material 121 thus obtained is forged in the same manner as the forged material 21 of the first embodiment. Thereby, the heat radiator (not shown) of the second embodiment is formed.

  In the radiator, the sacrificial corrosive material layer 123 is formed from the second aluminum-carbon particle composite material 126 that is potentialally lower than the core material portion 122 (more specifically, the aluminum matrix 125a of the first composite material 125 of the core material portion 122). Therefore, the heat dissipation and corrosion resistance of the radiation fin can be further improved.

  Further, when the first sintered material 130 and the second sintered material 136 are sintered together, the sacrificial corrosion material layer 123 is joined to the core material portion 122 at the same time, so that the number of manufacturing steps of the forged material 121 is reduced. Can do.

  In the present invention, the method for joining the sacrificial corrosion material layer 123 to the core member 122 is not limited to the above-described method, and for example, a hot or cold rolling clad method may be used. A joining method may be used.

  Further, in the present invention, the manufacturing method of the core material part 122 of the forging material 121 (plastic processing material 120) and the manufacturing method of the sacrificial corrosion material layer 123 are not limited to the above-described methods. The powder sintering method described above may be used, or other methods may be used.

  8 and 9 are diagrams illustrating a radiator of the cooling device according to the third embodiment of the present invention. In these drawings, elements having the same action as the elements of the radiator 1 of the first embodiment are denoted by reference numerals obtained by adding 200 to the reference numerals assigned to the elements of the radiator 1. The third embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 8, the radiator 201 according to the third embodiment includes a plurality of plate-like (in detail, flat plate) radiation fins 202 and a rod-like connecting member 205. The heat radiating fins 202 are called plate type fins. The connecting member 205 is made of metal, for example.

  A notch 206 is formed in a part of the outer peripheral edge of each radiating fin 202 (the end of the upper edge of each radiating fin 202 in the figure). These radiating fins 202 are arranged in parallel with a gap between them, and in this state, the connecting member 205 is caulked and fixed to the notches 206 of these radiating fins 202. Thereby, these radiation fins 202 are connected and integrated through the connecting member 205.

  In the radiator 201, a cooling fluid (not shown) is circulated between the radiation fins 202. As the cooling fluid, a cooling liquid (for example, cooling water), a cooling gas (for example, cooling air), or the like is used.

  As shown in FIG. 9, the radiating fin 202 includes a plate-like (particularly flat plate-shaped) core member 222 made of an aluminum-carbon particle composite material 225 and a sacrificial sacrificial layer as a skin layer bonded to the core member 222. The food material layer 223 is included as a material for the heat radiation fin 202.

  The composite material 225 includes an aluminum matrix 225a and a large number of carbon particles 225b. In the third embodiment, the carbon particles 225b are dispersed in the aluminum matrix 225a. More specifically, the carbon particles 225b are dispersed in the aluminum matrix 225a so as to be oriented in the surface direction of the radiation fins 202. For this reason, the thermal conductivity in the surface direction of the radiation fins 202 is higher than the thermal conductivity in the thickness direction of the radiation fins 202. Thereby, the heat dissipation of the radiation fin 202 (and the heat radiator 201) is improved.

  The sacrificial corrosive material layer 223 is made of a metal material or an aluminum-carbon particle composite material that is lower in potential than the core material portion 222 (more specifically, the aluminum matrix 225a of the aluminum-carbon particle composite material 225 of the core material portion 222). Is. Furthermore, the sacrificial corrosive material layer 223 is bonded to a predetermined surface of the core member 222 by a predetermined bonding method over the entire surface. The predetermined surfaces of the core member 222 are both surfaces of the core member 222 in the thickness direction.

  The method for joining the sacrificial corrosive material layer 223 to the core member 222 is not limited, and may be a hot or cold rolling clad method, or vacuum hot press firing as shown in the first embodiment. A bonding method, a discharge plasma sintering method, or the like may be used, or other bonding methods may be used.

  In the third embodiment, the radiating fin 202 has a flat plate shape. However, in the present invention, for example, a corrugated plate shape (for example, a wave plate type fin) may be used.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the first to third embodiments, and various modifications can be made without departing from the scope of the present invention. .

  For example, in the first and second embodiments, the radiator 1 includes a plurality of base plates 3 and a plurality of base plates 3 that are integrally provided in a protruding manner with respect to the base plate 3 on one side of the base plate 3 in the thickness direction. The radiator according to the present invention includes, for example, a plurality of radiators integrally provided in a protruding manner with respect to the base plate on both sides in the thickness direction of the base plate, for example. It may be provided with fins.

  Moreover, in the said 1st and 2nd embodiment, although the radiation fin 2 is a pin-shaped thing, in this invention, a radiation fin is not limited to being a pin-shaped thing. It may be in a shape.

  Further, in the present invention, the forging device for forging the forging material is not limited to the one shown in the first embodiment (see FIGS. 4 and 5), and for example, A plurality of radiating fin forming holes may be provided not on the pressing surface of the pressing punch of the forging device but on the bottom surface of the female molding recess.

  Furthermore, in the present invention, for example, when forming a radiator with a plurality of heat radiation fins integrally formed so as to protrude from the base plate on both surfaces in the thickness direction of the base plate by a forging device, The forging device for forging the forging material may be a device in which a plurality of heat radiation fins are provided on the bottom surface of the female molding recess of the forging device and the pressing surface of the pressing punch, respectively.

  In the first and second embodiments, the plastic working to the plastic working material 20 (120) is forging, but in the present invention, the plastic working is not limited to forging. In addition, for example, bending processing (fin processing), drawing processing, and cup processing may be used.

  Specific examples and comparative examples of the present invention will be described below.

<Example>
The cooling device 10 for the module substrate 50 shown in FIG. 1 was manufactured by the manufacturing method shown in the first embodiment.

  In the cooling device 10, the core material portion 22 (including the core material protrusion 22 a) of the radiator 1 is made of the aluminum-carbon particle composite material 25. The aluminum matrix 25a of the composite material 25 was A1100. The carbon particles 25b of the composite material 25 are pitch-based carbon fibers, and the average length in the longest axial direction was 300 μm.

  The sacrificial corrosion material layer 23 was made of A7072 which is one of Al—Zn alloys. The Zn content of the alloy was 1% by mass. The thickness of the sacrificial corrosion material layer 23 in the heat radiating fin 2 of the heat radiator 1 was 50 μm.

<Comparative example>
A cooling device similar to the cooling device 10 of the example was manufactured except that the radiator did not have a sacrificial corrosion material layer.

  The cooling device 10 of the example and the cooling device of the comparative example were each subjected to a corrosion resistance test against cooling running water as a cooling fluid. As a result, the corrosion resistance of the cooling device 10 of the example was higher than that of the comparative example.

  INDUSTRIAL APPLICABILITY The present invention can be used for a radiation fin, a radiator and a cooling device that dissipate heat from a heating element such as an electronic component (for example, a semiconductor element), and a method for manufacturing the radiator.

1: Radiator 2: Radiation fin 3: Base plate 10: Cooling device 11: Casing 12: Cooling fluid channel 20: Plastic working material 21: Forging material 22: Core material portion 22a: Core material protrusion 23: Sacrificial corrosion material layer 25 : Aluminum-carbon particle composite material 30: Sintered material 130: First sintered material 136: Second sintered material 205: Connecting member

Claims (10)

  A radiation fin having a core part made of an aluminum-carbon particle composite material and a sacrificial corrosion material layer as a skin material layer. The sacrificial corrosive material layer is made of a metal material that is electrically base with respect to the core material portion,
The heat radiation fin according to claim 1, wherein an Al-Zn alloy, an Al-In alloy, or an Al-Sn alloy is used as the metal material.   The heat-radiating fin according to claim 1, wherein the sacrificial corrosion material layer is made of an aluminum-carbon particle composite material that is lower in potential than the core material portion.   The heat radiator provided with the radiation fin in any one of Claims 1-3. A base plate,
A plurality of the heat dissipating fins;
The radiator according to claim 4, wherein the plurality of radiating fins are provided on the base plate so as to protrude. It further includes a rod-shaped connecting member,
A plurality of the heat dissipating fins;
Each said radiation fin is plate shape,
The heat radiator according to claim 4, wherein the plurality of heat dissipating fins are connected and integrated via the connecting member in a state of being arranged in parallel. A radiator according to claim 5, and a casing having a bottom wall and a peripheral wall and formed in a container shape opened upward and provided with a cooling fluid flow path therein.
A cooling device in which an outer peripheral edge portion of a base plate of the radiator is joined to an upper edge portion of the peripheral wall of the casing in a state where a plurality of radiating fins of the radiator are arranged inside the casing. A method of manufacturing a radiator, comprising forming a radiator including a base plate and a plurality of fins integrally formed in a protruding manner on the base plate by plastic processing a plastic working material,
Preparing a plastic working material having a plate-like core material portion made of an aluminum-carbon particle composite material and a sacrificial corrosion material layer as a skin material layer bonded to the core material portion;
The plastic working material is plastic processed so that the material on the core portion side of the plastic working material has a shape of a base plate and the material on the sacrificial corrosion material layer side of the plastic working material protrudes at a plurality of locations. By this, the manufacturing method of the heat radiator which forms a base plate and several heat radiation fins are integrally formed in the said base plate at the same time. The core part of the plastic working material is formed by sintering a sintered material,
By sintering the sintered material in a state where the sacrificial corrosive material layer is in contact with the sintered material, the sacrificial corrosive material layer is sintered and joined to the core material portion at the same time as forming the core material portion. The method of manufacturing a radiator according to claim 8, wherein the plastically processed material is obtained. The core part of the plastic working material is formed by sintering a first sintered material,
The sacrificial corrosion material layer is formed by sintering the second sintered material,
The core material part and the sacrificial corrosive material layer are formed by simultaneously sintering the second sintered material in contact with the first sintered material, and the sacrificial corrosive material is formed on the core material part. The method for manufacturing a radiator according to claim 8, wherein the layers are sintered and bonded to obtain the plastic working material.

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