Heat dissipation parts

Abstract

To provide a heat dissipation component having an excellent heat dissipation characteristic.SOLUTION: A heat dissipation component is composed of a metal member having a surface on which with respect to 6 straight line parts in total composed of arbitrary 3 straight line parts in parallel with one another and arbitrary 3 straight line parts orthogonal to the 3 straight line parts, surface roughness obtained by measurement compliant to JIS B0601:2001 (corresponding international standard: ISO4287) satisfies the following requirements (1) and (2) at the same time: (1) one or more straight line parts are included that have a load length rate (Rmr) of 30% or less in a roughness curve when a cut level is 20% and an evaluation length is 4 mm; and (2) all straight line parts have ten point average roughness (Rzjis) exceeding 2 μm when an evaluation length is 4 mm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a heat dissipation component. [Background technology]

[0002] In recent years, batteries have been attracting attention as a power source for electric vehicles and other devices. It is known that high-output, large-capacity batteries generate a large amount of heat during the charging and discharging process, and this heat causes battery deterioration. Therefore, batteries require components that improve heat dissipation. Furthermore, heat countermeasures have long been considered important for electronic components equipped with heat-generating semiconductor elements. In particular, with the recent trend toward smaller electronic components and higher density packaging, as well as the increasing speed of microprocessors, the power consumption per electronic component has increased significantly, creating a demand for components with improved heat dissipation properties.

[0003] An example of a heat dissipation component is a metal-resin composite. A technology relating to such a metal-resin composite is described in, for example, Patent Document 1 (WO 2016 / 084397).

[0004] Patent Document 1 discloses a metal resin composite in which a member made of a thermally conductive resin composition and a member made of a surface-treated metal are contact-joined by injection molding of the thermally conductive resin composition, the thermally conductive resin composition containing a thermoplastic resin (A) and an inorganic filler (B) having a thermal conductivity of 1 W / (m·K) or more in the planar direction, and the inorganic filler (B) being at least one type selected from the group consisting of inorganic particles having specific physical properties and inorganic fibers having specific physical properties. Patent Document 1 describes that such a metal-resin composite has excellent heat dissipation properties and moldability, is lightweight, and can be easily and inexpensively produced. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2016 / 084397 Summary of the Invention [Problem to be solved by the invention]

[0006] As the performance of heat generating elements such as electronic components and batteries improves, the amount of heat generated by the heat generating elements increases, and heat dissipation components are therefore required to have even better heat dissipation properties.

[0007] The present invention has been made in view of the above circumstances, and has an object to provide a heat dissipating component having excellent heat dissipation characteristics. [Means for solving the problem]

[0008] In order to improve the heat dissipation of a heat dissipation component made of a metal member, the inventors have zjis ) was considered. However, the ten-point average roughness (R zjis It became clear that the heat dissipation performance of metal parts could not be improved sufficiently by simply adjusting the temperature. Therefore, the inventors further studied design guidelines for improving the heat dissipation of heat dissipating parts made of metal members, and found that the load length ratio (Rmr) of the roughness curve of the surface of the metal member is effective as such a design guideline, and arrived at the present invention.

[0009] That is, according to the present invention, the following heat dissipation component is provided.

[0010] [1] A heat dissipation component made of a metal member, A heat dissipation component whose surface roughness, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287), for a total of six straight line sections consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the above three straight line sections, simultaneously satisfies the following requirements (1) and (2). (1) The cut level is 20%, and the roughness curve has a load length ratio (Rmr) of 30% or less at an evaluation length of 4 mm. ... (2) Ten-point average roughness (R zjis ) exceeds 2μm [2] In the heat dissipation component according to the above item [1], A heat dissipation component whose surface roughness, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287), for a total of six straight line sections consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the above three straight line sections, further satisfies the following requirement (3). (3) The cut level is 40%, and the roughness curve has a load length ratio (Rmr) of 60% or less at an evaluation length of 4 mm. [3] In the heat dissipation component according to the above [1] or [2], For a total of six straight line sections, consisting of three arbitrary straight line sections in a parallel relationship on the surface of the above-mentioned metal member and three arbitrary straight line sections perpendicular to the above three straight line sections, the above ten-point average roughness (R zjis ) exceeds 5μm. [4] In the heat dissipation component according to the above item [3], For a total of six straight line sections, consisting of three arbitrary straight line sections in a parallel relationship on the surface of the above-mentioned metal member and three arbitrary straight line sections perpendicular to the above three straight line sections, the above ten-point average roughness (R zjis ) is 15μm or more. [5] In the heat dissipation component according to any one of the above [1] to [4], A heat dissipation component whose surface roughness, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287), for a total of six straight line sections consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the above three straight line sections, further satisfies the following requirement (4). (4) The average length of the roughness curve element (RSm) of all straight lines is more than 10 μm and less than 300 μm. [6] In the heat dissipation component according to any one of the above [1] to [5], The metal member is a heat dissipating part constituted by at least one member selected from the group consisting of aluminum members, aluminum alloy members, copper members and copper alloy members. [7] In the heat dissipation component according to any one of the above [1] to [6], A heat dissipating component in which a resin member is not bonded to the metal member. [8] In the heat dissipation component according to any one of the above [1] to [7], A heat dissipation component in which a resin member is bonded to the metal member. [9] In the heat dissipation component according to any one of the above [1] to [8], A heat dissipating part that is a heat dissipating housing, a heat sink or a heat exchanger. Effect of the Invention

[0011] According to the present invention, it is possible to provide a heat dissipation component having excellent heat dissipation characteristics. [Brief description of the drawings]

[0012] [Figure 1] This is a schematic diagram for explaining measurement points for a total of six straight line sections, consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the three straight line sections, on the surface of the metal component according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that unless otherwise specified, "-" between numbers in the text means "above" or "below."

[0014] [Heat dissipation parts] The heat dissipation component according to this embodiment will be described below. The heat dissipation component of this embodiment is made of a metal member, and the surface roughness of a total of six straight line sections, consisting of any three straight line sections that are in a parallel relationship and any three straight line sections that are perpendicular to the three straight line sections, on the surface of the metal member, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) simultaneously satisfies the following requirements (1) and (2). (1) The cut level is 20%, and the roughness curve has a load length ratio (Rmr) of 30% or less at an evaluation length of 4 mm. ... (2) Ten-point average roughness (R zjis ) exceeds 2μm

[0015] FIG. 1 is a schematic diagram illustrating a total of six straight line sections on the surface of a metal component according to this embodiment, which includes three straight line sections that are in a parallel relationship and three straight line sections that are perpendicular to the three straight line sections. The six straight line segments may be, for example, six straight line segments B1 to B6 as shown in Fig. 1. First, a center line B1 passing through a center A of the surface of the metal member is selected as a reference line. Next, straight lines B2 and B3 parallel to the center line B1 are selected. Next, a center line B4 perpendicular to the center line B1 is selected, and straight lines B5 and B6 perpendicular to the center line B1 and parallel to the center line B4 are selected. Here, the perpendicular distances D1 to D4 between the respective straight lines are, for example, 2 to 5 mm.

[0016] Heat dissipation parts made of metal members that simultaneously satisfy the above requirements (1) and (2) have excellent heat dissipation properties. Although the reason for this is not entirely clear, it is thought that metal members that simultaneously satisfy the above requirements (1) and (2) have a complex micro-convex structure on the surface, which increases the area available for diffusing heat to the outside and provides a structure that can effectively diffuse heat to the outside. In order to improve the heat dissipation of a heat dissipation component made of a metal member, the inventors have zjis ) was considered. However, the ten-point average roughness (R zjisIt became clear that the heat dissipation performance of metal parts could not be improved sufficiently by simply adjusting the temperature. Here, the inventors considered that the load length ratio is an effective measure as an index for expressing the sharpness of the uneven shape of the surface of a metal member. A small load length ratio means that the sharpness of the uneven shape of the surface of a metal member is large, and a large load length ratio means that the sharpness of the uneven shape of the surface of a metal member is small. Therefore, the inventors of the present invention have focused on the load length ratio of the roughness curve of the surface of the metal member as a design guideline for improving the heat dissipation of heat dissipation components made of metal members, and have further conducted intensive research. As a result, they have found that by adjusting the load length ratio of the surface of the metal member to a specific value or less, the area for diffusing heat to the outside is increased, and as a result, a heat dissipation component with excellent heat dissipation characteristics can be realized, and have completed the present invention.

[0017] From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component according to this embodiment, it is preferable that the surface roughness of a total of six straight line sections, consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the above three straight line sections, on the surface of the metal member, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) further satisfies one or more of the following requirements (1A) to (1C), and it is particularly preferable that requirement (1C) is satisfied. Note that requirement (1C) is the same as requirement (3) described above. (1A) The roughness curve has a load length ratio (Rmr) of 30% or less at a cutting level of 20% and an evaluation length of 4 mm. The roughness curve has preferably 2 or more straight line portions, more preferably 3 or more straight line portions, and most preferably 6 straight line portions. (1B) The roughness curve has a load length ratio (Rmr) of 20% or less at a cutting level of 20% and an evaluation length of 4 mm. ... preferably has one or more straight line portions, more preferably two or more straight line portions, even more preferably three or more straight line portions, and most preferably six straight line portions. (1C) The roughness curve has a load length ratio (Rmr) of 60% or less at a cutting level of 40% and an evaluation length of 4 mm. ... preferably has one or more straight line portions, more preferably two or more straight line portions, even more preferably three or more straight line portions, and most preferably six straight line portions.

[0018] Furthermore, from the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component according to this embodiment, the average value of the load length ratio (Rmr) of the roughness curve on the surface of the metal member at a cut level of 20% and an evaluation length of 4 mm, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287), is preferably 0.1% or more and 40% or less, more preferably 0.5% or more and 30% or less, even more preferably 1% or more and 20% or less, and most preferably 2% or more and 15% or less. The average value of the load length ratio (Rmr) can be calculated by averaging the load length ratios (Rmr) of any six straight portions described above.

[0019] Each load length ratio (Rmr) of the surface of the metal member according to this embodiment can be controlled by appropriately adjusting the conditions of the roughening treatment for the surface of the metal member. In this embodiment, factors for controlling each of the load length ratios (Rmr) include, in particular, the type and concentration of the etching agent, the temperature and time of the roughening treatment, and the timing of the etching treatment.

[0020] From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component of this embodiment, it is preferable that the surface roughness of a total of six straight lines, consisting of any three straight lines in a parallel relationship and any three straight lines perpendicular to the three straight lines on the surface of the metal member, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) further satisfies the following requirement (2A). (2A) Ten-point average roughness (R zjis ) is preferably more than 5 μm, more preferably 10 μm or more, and even more preferably 15 μm or more.

[0021] In order to further improve the heat dissipation characteristics of the heat dissipation component according to the present embodiment, the ten-point average roughness (R zjis) is preferably more than 2 μm and not more than 50 μm, more preferably more than 5 μm and not more than 45 μm, further preferably 10 μm or more and 40 μm or less, and particularly preferably 15 μm or more and 30 μm or less. In addition, the ten-point average roughness (R zjis ) is the ten-point average roughness (R zjis ) can be used as the average.

[0022] From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component of this embodiment, it is preferable that the surface roughness of a total of six straight line sections, consisting of any three straight line sections in a parallel relationship and any three straight line sections perpendicular to the above three straight line sections, on the surface of the metal member, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) further satisfies the following requirement (4). (4) The average length of the roughness curve element (RSm) of all straight line portions is more than 10 μm and less than 300 μm, and more preferably 20 μm or more and 200 μm or less.

[0023] From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component of this embodiment, the average value of the average length of the roughness curve elements (RSm) on the surface of the metal member is preferably more than 10 μm and less than 300 μm, more preferably 20 μm or more and 200 μm or less. The average value of the average length (RSm) of the roughness curve elements can be the average of the RSm of any six straight line portions mentioned above.

[0024] The ten-point average roughness (R zjis ) and the average length of the roughness curve element (RSm) can be controlled by appropriately adjusting the conditions of the roughening treatment for the surface of the metal component. In this embodiment, the temperature and time of the roughening treatment, the amount of etching, etc. are particularly set to the ten-point average roughness (R zjis ) and the average length of the roughness profile element (RSm).

[0025] From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component according to the present embodiment, it is preferable that the metal member according to the present embodiment has excellent heat conductivity. From this viewpoint, an aluminum-based metal or a copper-based metal is used as the metal species constituting the metal member according to the present embodiment, and specifically, it is preferable that the metal member according to the present embodiment is composed of at least one member selected from the group consisting of aluminum members, aluminum alloy members, copper members, and copper alloy members. In addition, the average thickness of the metal member according to the present embodiment is, for example, 0.5 mm to 30 mm, preferably 0.5 mm to 20 mm, taking into consideration heat conductivity, strength, and light weight. As the aluminum alloy, alloy numbers 1050, 1100, 2014, 2024, 3003, 5052, 7075, etc. specified in JIS H4000 are preferably used.

[0026] The shape of the metal member is not particularly limited and can be appropriately selected depending on the type of heat dissipating component. Examples of the heat dissipating component according to the present embodiment include a heat dissipating housing, a heat sink, a heat exchanger, etc. The heat sink may or may not have fins.

[0027] The metal member according to the present embodiment is preferably a metal material that has been processed into the above-mentioned predetermined shape by cutting, plastic processing by pressing or the like, punching, cutting, polishing, electrical discharge machining or other thinning processing, and then roughening treatment, which will be described later. In short, it is preferable to use a material that has been processed into a required shape by various processing methods.

[0028] (Method for roughening the surface of a metal component) Next, the method for roughening the surface of a metal member according to this embodiment will be described. The surface of the metal member according to this embodiment can be formed, for example, by roughening treatment using an etching agent. Here, the roughening treatment of the surface of a metal member using an etching agent has been performed in the prior art. However, in this embodiment, factors such as the type and concentration of the etching agent, the temperature and time of the roughening treatment, and the timing of the etching treatment are highly controlled. In order to obtain the metal member according to this embodiment, it is important to highly control these factors. An example of the method for roughening a surface of a metal member according to the present embodiment will be described below, however, the method for roughening a surface of a metal member according to the present embodiment is not limited to the following example.

[0029] (1) Pretreatment process First, it is desirable that the surface of the metal member does not have a thick coating made of oxide or hydroxide. In order to remove such a thick coating, the surface layer may be polished by mechanical polishing such as sandblasting, shot blasting, grinding, barrel processing, etc., or chemical polishing, before the next step of treating with an etching agent. In addition, if the surface of the metal member is significantly contaminated by machine oil, etc., it is preferable to treat it with an alkaline aqueous solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution, or to degrease it.

[0030] (2) Surface roughening process In the present embodiment, as a method for roughening the surface of a metal member, a treatment with an acid-based etchant described below is preferably carried out at a specific timing. Specifically, the treatment with the acid-based etchant is preferably carried out at the final stage of the surface roughening treatment process.

[0031] In addition, JP2013-52671A discloses an embodiment in which an alkaline etching agent is used as an etching agent for surface roughening treatment of a metal member made of a metal material containing aluminum, an embodiment in which an alkaline etching agent and an acid etching agent are used in combination, and an embodiment in which treatment with an acid etching agent is followed by washing with an alkaline solution. The alkaline etching agent is preferably used from the viewpoint of workability because it reacts mildly with metal members. However, according to the study by the present inventors, it has become clear that the degree of roughening treatment of the metal member surface is weak because of the mild reactivity of the alkaline etching agent, and it is difficult to form a deep uneven shape. In addition, it has become clear that when an alkaline etching agent or an alkaline solution is used in combination after performing an acid etching agent treatment, the deep uneven shape formed by the acid etching agent is somewhat smoothed by the subsequent treatment with the alkaline etching agent or the alkaline solution. Therefore, it is considered difficult to sufficiently improve the heat dissipation characteristics of metal components treated with this alkaline etching agent, or metal components obtained by using an alkaline etching agent or alkaline solution in the final step of the etching process.

[0032] Examples of the method of roughening treatment using the acid-based etching agent include treatment methods by immersion, spraying, etc. The treatment temperature is preferably 20 to 40° C., and the treatment time is preferably about 5 to 350 seconds, and from the viewpoint of roughening the surface of the metal member more uniformly, 20 to 300 seconds is more preferable, and 50 to 300 seconds is particularly preferable.

[0033] The surface of the metal member is roughened to have an uneven shape by the roughening treatment using the acid-based etching agent. The etching amount (dissolution amount) in the depth direction of the metal member when the acid-based etching agent is used is preferably 0.1 to 500 μm, more preferably 5 to 500 μm, and even more preferably 5 to 100 μm, calculated from the mass, specific gravity, and surface area of ​​the dissolved metal member. If the etching amount is equal to or greater than the lower limit, the heat dissipation characteristics of the heat dissipation component according to this embodiment can be further improved. If the etching amount is equal to or less than the upper limit, the processing cost can be reduced. The etching amount can be adjusted by the processing temperature, processing time, etc.

[0034] In this embodiment, when the metal member is roughened using the acid-based etching agent, the entire surface of the metal member may be roughened, or a part of the surface may be roughened. From the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component according to this embodiment, it is preferable to roughen the entire surface of the metal member.

[0035] (3) Post-processing In this embodiment, after the surface roughening treatment step, it is usually preferable to perform washing with water and drying. There is no particular limitation on the method of washing with water, but it is preferable to wash by immersion or with running water for a predetermined period of time.

[0036] Furthermore, as a post-treatment step, ultrasonic cleaning is preferably performed to remove smut etc. generated by the treatment using the acid-based etching agent. The conditions for ultrasonic cleaning are not particularly limited as long as they can remove the generated smut etc., but the solvent used is preferably water, and the treatment time is preferably 1 to 20 minutes.

[0037] (acid etching agent) In this embodiment, the etching agent used for the roughening treatment of the metal member surface is preferably a specific acid-based etching agent described below. By treating the metal member surface with the specific etching agent, a complex-shaped fine uneven structure is formed, and the area for diffusing heat to the outside is increased by the fine uneven structure, which is considered to improve the heat dissipation characteristics of the heat dissipation component according to this embodiment.

[0038] The components of the acid-based etching agent that can be used in this embodiment will be described below.

[0039] The acid-based etching agent contains at least one of ferric ions and cupric ions, and an acid, and may contain manganese ions, various additives, and the like, as necessary.

[0040] Ferric ion The ferric ion is a component that oxidizes metal members, and the ferric ion can be contained in the acid etching agent by blending a ferric ion source. Examples of the ferric ion source include ferric nitrate, ferric sulfate, and ferric chloride. Among the ferric ion sources, ferric chloride is preferred because it has excellent solubility and is inexpensive.

[0041] In this embodiment, the content of the ferric ions in the acid-based etching agent is preferably 0.01 to 20 mass%, more preferably 0.1 to 12 mass%, even more preferably 0.5 to 7 mass%, even more preferably 1 to 6 mass%, and particularly preferably 1 to 5 mass%. When the content of the ferric ions is equal to or more than the lower limit, the roughening rate (dissolution rate) of the metal member can be prevented from decreasing. On the other hand, when the content of the ferric ions is equal to or less than the upper limit, the roughening rate can be appropriately maintained, and therefore, uniform roughening that is more suitable for improving the heat dissipation characteristics of the heat dissipation component can be achieved.

[0042] Cupric ion The cupric ion is a component that oxidizes metal members, and the cupric ion can be contained in the acid etching agent by blending a cupric ion source. Examples of the cupric ion source include cupric sulfate, cupric chloride, cupric nitrate, and cupric hydroxide. Among the cupric ion sources, cupric sulfate and cupric chloride are preferred because they are inexpensive.

[0043] In this embodiment, the content of the cupric ions in the acid-based etching agent is preferably 0.001 to 10 mass%, more preferably 0.01 to 7 mass%, even more preferably 0.05 to 1 mass%, even more preferably 0.1 to 0.8 mass%, even more preferably 0.15 to 0.7 mass%, and particularly preferably 0.15 to 0.4 mass%. If the content of the cupric ions is equal to or greater than the lower limit, the roughening rate (dissolution rate) of the metal member can be prevented from decreasing. On the other hand, if the content of the cupric ions is equal to or less than the upper limit, the roughening rate can be appropriately maintained, thereby enabling uniform roughening that is more suitable for improving the heat dissipation characteristics of the heat dissipation component.

[0044] The acid-based etching agent may contain only one of ferric ions and cupric ions, or may contain both, but preferably contains both ferric ions and cupric ions. By containing both ferric ions and cupric ions, the acid-based etching agent can easily obtain a good roughened shape that is more suitable for improving the heat dissipation characteristics of the heat dissipation component.

[0045] When the acid etching agent contains both ferric ions and cupric ions, the respective contents of the ferric ions and cupric ions are preferably within the above ranges. The total content of the ferric ions and cupric ions in the acid etching agent is preferably 0.011 to 20 mass%, more preferably 0.1 to 15 mass%, further preferably 0.5 to 10 mass%, and particularly preferably 1 to 5 mass%.

[0046] Manganese ions The acid etching agent may contain manganese ions in order to roughen the surface of the metal member uniformly. Manganese ions can be contained in the acid etching agent by blending a manganese ion source. Examples of the manganese ion source include manganese sulfate, manganese chloride, manganese acetate, manganese fluoride, and manganese nitrate. Among the manganese ion sources, manganese sulfate and manganese chloride are preferred because they are inexpensive.

[0047] In this embodiment, the content of the manganese ions in the acid-based etching agent is preferably 0 to 1 mass %, and more preferably 0 to 0.5 mass %.

[0048] ·acid The acid is a component that dissolves metals oxidized by ferric ions and / or cupric ions. Examples of the acid include inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, perchloric acid, and sulfamic acid, and organic acids such as sulfonic acid and carboxylic acid. Examples of the carboxylic acid include formic acid, acetic acid, citric acid, oxalic acid, and malic acid. The acid-based etching agent can contain one or more of these acids. Among the inorganic acids, sulfuric acid is preferred because it has almost no odor and is inexpensive. Among the organic acids, carboxylic acid is preferred from the viewpoint of uniformity of the roughened shape.

[0049] In this embodiment, the content of the acid in the acid-based etching agent is preferably 0.1 to 50 mass%, more preferably 0.5 to 50 mass%, even more preferably 1 to 50 mass%, even more preferably 1 to 30 mass%, even more preferably 1 to 25 mass%, and even more preferably 2 to 18 mass%. If the content of the acid is equal to or more than the lower limit, a decrease in the roughening rate (dissolution rate) of the metal can be prevented. On the other hand, if the content of the acid is equal to or less than the upper limit, crystallization of the metal salt when the liquid temperature is lowered can be prevented, thereby improving workability.

[0050] Other ingredients In the acid-based etching agent usable in this embodiment, a surfactant may be added to prevent uneven roughening caused by surface contaminants such as fingerprints, and other additives may be added as necessary. Examples of other additives include halide ion sources added to form deep unevenness, such as sodium chloride, potassium chloride, sodium bromide, and potassium bromide. Alternatively, examples include thiosulfate ions, thio compounds such as thiourea, and azoles such as imidazole, triazole, and tetrazole, which are added to obtain a more uniform roughened shape, and pH adjusters added to control the roughening reaction. When these other components are added, the total content thereof is preferably about 0.01 to 10 mass% in the acid-based etching agent.

[0051] The acid-based etching agent of the present embodiment can be easily prepared by dissolving the above-mentioned components in ion-exchanged water or the like.

[0052] In the heat dissipation component of this embodiment, from the viewpoint of further improving the heat dissipation characteristics of the heat dissipation component of this embodiment, it is preferable that a resin member is not joined to the metal member of this embodiment, but a resin member may be joined to the metal member.

[0053] The resin member according to the present embodiment is preferably a molded article of a thermoplastic resin composition. The thermoplastic resin composition contains a thermoplastic resin as a resin component, and may further contain a filler as necessary. The thermoplastic resin is not particularly limited, and examples thereof include polyolefin resins, polar group-containing polyolefin resins, polymethacrylic resins such as polymethyl methacrylate resin, polyacrylic resins such as polymethyl acrylate resin, polystyrene resins, polyvinyl alcohol-polyvinyl chloride copolymer resins, polyvinyl acetal resins, polyvinyl butyral resins, polyvinyl formal resins, polymethylpentene resins, maleic anhydride-styrene copolymer resins, polycarbonate resins, polyphenylene ether resins, polyether ether ketone resins, polyether Aromatic polyetherketones such as terketone resins, polyester resins, polyamide resins, polyamideimide resins, polyimide resins, polyetherimide resins, styrene elastomers, polyolefin elastomers, polyurethane elastomers, polyester elastomers, polyamide elastomers, ionomers, amino polyacrylamide resins, isobutylene maleic anhydride copolymers, ABS, ACS, AES, AS, ASA, MBS, ethylene-vinyl chloride copolymers, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate-vinyl chloride graft polymers, ethylene-vinyl alcohol copolymers, chlorinated polyvinyl chloride resins, chlorinated polyethylene resins, chlorinated polypropylene resins, carboxyvinyl polymers, ketone resins, amorphous copolyester resins, norbornene resins, fluoroplastics, polytetrafluoroethylene resins, fluorinated ethylene polypropylene resins, PFA, polychlorofluoroethylene resins, ethylene tetrafluoroethylene copolymers, polyvinylidene fluoride resins, polyvinyl fluoride resins, polyarylate resins, thermoplastic polyimide resins, polyvinylidene chloride resins Examples of the resins that can be used include polyvinyl chloride resins, polyvinyl acetate resins, polysulfone resins, polyparamethylstyrene resins, polyallylamine resins, polyvinyl ether resins, polyphenylene oxide resins, polyphenylene sulfide (PPS) resins, polymethylpentene resins, oligoester acrylates, xylene resins, maleic acid resins, polyhydroxybutyrate resins, polysulfone resins, polylactic acid resins, polyglutamic acid resins, polycaprolactone resins, polyethersulfone resins, polyacrylonitrile resins, and styrene-acrylonitrile copolymer resins.These thermoplastic resins may be used alone or in combination of two or more.

[0054] Among these, as the thermoplastic resin, one or more thermoplastic resins selected from polyolefin-based resins, polyester-based resins, polyamide-based resins, fluorine-based resins, polyarylene ether-based resins, and polyarylene sulfide-based resins are preferably used.

[0055] The resin member according to the present embodiment can be used in combination with an optional component and a filler from the viewpoint of improving mechanical properties, adjusting the difference in linear expansion coefficient, improving thermal conductivity, etc. As the filler, for example, one or more types can be selected from the group consisting of glass fiber, carbon fiber, carbon particles, clay, talc, silica, minerals, and cellulose fibers. Among these, one or more types selected from glass fiber, carbon fiber, talc, and minerals are preferable. In addition, heat dissipating fillers represented by alumina, forsterite, mica, alumina nitride, boron nitride, zinc oxide, magnesium oxide, etc. can also be used. The shape of these fillers is not particularly limited, and may be any shape such as fibrous, particulate, or plate-like, but it is preferable to use a filler having a size large enough to penetrate into the recesses of the fine uneven structure on the surface of the metal member. In addition, when the resin member according to this embodiment contains a filler, the content thereof is preferably 1 part by mass or more and 100 parts by mass or less, more preferably 5 parts by mass or more and 90 parts by mass or less, and particularly preferably 10 parts by mass or more and 80 parts by mass or less, relative to 100 parts by mass of the thermoplastic resin.

[0056] A thermosetting resin composition can also be used as the resin member according to this embodiment. The thermosetting resin composition is a resin composition containing a thermosetting resin. As the thermosetting resin, for example, a phenol resin, an epoxy resin, an unsaturated polyester resin, a diallyl phthalate resin, a melamine resin, an oxetane resin, a maleimide resin, a urea resin, a polyurethane resin, a silicone resin, a resin having a benzoxazine ring, a cyanate ester resin, etc. can be used. These may be used alone or in combination of two or more. Among these, from the viewpoints of heat resistance, processability, mechanical properties, adhesion, and rust prevention, a thermosetting resin composition containing one or more selected from the group consisting of phenolic resins, epoxy resins, and unsaturated polyester resins is preferably used. The content of the thermosetting resin in the thermosetting resin composition is preferably 15 parts by mass or more and 60 parts by mass or less, and more preferably 25 parts by mass or more and 50 parts by mass or less, when the entire resin composition is taken as 100 parts by mass. The remaining component is, for example, a filler, and as the filler, for example, the above-mentioned fillers can be used.

[0057] As a molding method for the resin member, a known method can be used without any limitation, and examples thereof include injection molding, extrusion molding, hot press molding, compression molding, transfer molding, cast molding, laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), spray molding, etc. Among these, as a molding method for the resin member, injection molding is preferable from the viewpoints of productivity and quality stability.

[0058] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above can also be adopted. EXAMPLES

[0059] The present embodiment will be described in detail below with reference to examples and comparative examples, but the present embodiment is not limited to the descriptions of these examples.

[0060] [Example 1] (Surface treatment) A heat sink (HEAT1-50 manufactured by MISUMI) made of an aluminum alloy member of alloy number 6063 specified in JIS H4100 was etched by immersing it in an acid-based etching aqueous solution (balance: ion-exchanged water, liquid temperature: 30°C) containing 15.6 mass% ferric chloride, 0.4 mass% cupric chloride, 0.7 mass% manganese sulfate (monohydrate), and 8.2 mass% sulfuric acid for 40 seconds and shaking it. Then, ultrasonic cleaning was performed with running water (in water, 1 minute), and the heat sink was dried to obtain a surface-treated heat sink.

[0061] (Roughness curve load length ratio (Rmr), ten-point average roughness (R zjis ) and measurement of the mean length of the roughness profile element (RSm) Next, the surface roughness of the obtained surface-treated heat sink was measured using a surface roughness measuring device "Surfcom 1400D (manufactured by Tokyo Seimitsu Co., Ltd.)" and the load length ratio (Rmr) and ten-point average roughness (R zjis ) and the average length of the roughness curve element (RSm) were obtained. Among these, the Rmr(20%) value at a cutting level of 20%, the number of straight line sections where the Rmr(20%) value is 30% or less, the Rmr(40%) value at a cutting level of 40%, the number of straight line sections where the Rmr(40%) value is 60% or less, and the Rmr(40%) value at 6 straight line sections. zjis The etching rate calculated from the surface roughness value, the average length of the roughness curve element (RSm), and the mass ratio of the heat sink before and after the etching process is shown below.

[0062] Rmr(20%) value at 20% amputation level [%]: 49.6, 25.0, 10.4, 33.5, 5.7, 16.7 Number of straight sections with Rmr(20%) value of 30% or less: 4 Rmr(40%) values ​​at 40% amputation level [%]: 75.4, 63.3, 42.1, 65.3, 47.6, 50.1 Number of straight sections with Rmr(40%) value of 60% or less: 3 6 Straight section R zjisValues ​​[μm]: 11.0, 12.2, 13.8, 11.7, 10.8, 11.3 Average length of roughness curve element (RSm) [μm]: 73.1, 74.2, 88.1, 93.0, 92.6, 99.1 Etching rate [mass%]: 1.1

[0063] The measurement conditions for the surface roughness measuring device are as follows: ·Stylus tip radius: 5μm Reference length: 0.8 mm Evaluation length: 4mm ·Measurement speed: 0.06mm / sec The measurements were performed on a total of six straight line sections on the surface of the metal part, consisting of three arbitrary straight line sections in a parallel relationship and three arbitrary straight line sections perpendicular to the aforementioned straight line sections (see Figure 1).

[0064] (Measurement of maximum temperature and thermal resistance) The surface-treated heat sink was subjected to radiation temperature distribution measurement and temperature measurement using a thermocouple to determine the maximum temperature and thermal resistance. The measurement conditions are as follows. Sample heat source: Ceramic heater Heating voltage: 30[V] Measurement time: Until saturation at maximum temperature -Sample installation environment, ambient temperature: Installed in an acrylic chamber, 24.6[℃] - Black paint coating: To reduce errors caused by reflection in the radiation temperature distribution measurement, black paint was applied to a part of the heat sink. - Thermocouple installation location: Thermocouples were installed in two locations, the center of the front surface of the heatsink and the center of the back surface, with thermally conductive grease applied to the tips. The thermocouple on the back surface of the heatsink was installed between the heatsink and the ceramic heater located on the back surface of the heatsink.

[0065] A voltage was applied while monitoring the temperature of the target sample, and a voltage of 30 V was set as a condition that allowed control below the requirement of the measurement system (approximately 90°C). Next, the power and the temperature difference due to the thermocouple (temperature difference between the front and back surfaces) were calculated from the current value at 30V, and the thermal resistance value (temperature difference / power value) was calculated from the relationship between power and temperature difference. In addition, the maximum temperature reached by the target sample was measured using infrared thermography. As a result, the maximum temperature reached by infrared thermography was 75.2℃, and the thermal resistance was 0.09[K / W].

[0066] [Comparative Example 1] Except for using a heat sink (HEAT1-50 manufactured by MISUMI Co., Ltd.) made of an aluminum alloy member of alloy number 6063 specified in JIS H4100 without surface treatment, the maximum temperature and thermal resistance were measured in the same manner as in Example 1. As a result, the maximum temperature observed using infrared thermography was 79.4°C, and the thermal resistance was 0.39 K / W.

Claims

1. A heat dissipation component made of a metal member, The surface roughness of a total of six straight line portions, consisting of any three straight line portions in a parallel relationship and any three straight line portions perpendicular to the three straight line portions, on the surface of the metal member, measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) simultaneously satisfies the following requirements (1) and (2), A resin member is not joined to the metal member, A heat dissipating component that is a heat sink or heat exchanger. (1) The cut level is 20%, and the roughness curve at an evaluation length of 4 mm has a load length ratio (Rmr) of 30% or less, and includes 4 or more straight line portions. (2) The ten-point average roughness (R ｚｊｉｓ ) is 10 μm or more

2. The heat dissipation component according to claim 1 , A heat dissipation component in which the surface roughness of a total of six straight line portions, consisting of any three straight line portions in a parallel relationship and any three straight line portions perpendicular to the three straight line portions, on the surface of the metal member, as measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) further satisfies the following requirement (3). (3) The roughness curve includes at least one straight line portion in which the load length ratio (Rmr) at a cut level of 40% and an evaluation length of 4 mm is 60% or less.

3. The heat dissipation component according to claim 1 or 2, The ten-point average roughness (R ｚｊｉｓ ) exceeds 5 μm.

4. The heat dissipating component according to claim 3, The ten-point average roughness (R ｚｊｉｓ ) is 15 μm or more.

5. The heat dissipation component according to any one of claims 1 to 4, A heat dissipation component in which the surface roughness of a total of six straight line portions, consisting of any three straight line portions in a parallel relationship and any three straight line portions perpendicular to the three straight line portions, on the surface of the metal member, as measured in accordance with JIS B0601:2001 (corresponding international standard: ISO4287) further satisfies the following requirement (4). (4) The average length (RSm) of the roughness curve element of all straight line portions is more than 10 μm and less than 300 μm.

6. The heat dissipation component according to any one of claims 1 to 5, The metal member is a heat dissipating component constituted by at least one member selected from the group consisting of aluminum members, aluminum alloy members, copper members, and copper alloy members.

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