JP6639891B2 - Heat pipe and method of manufacturing heat pipe - Google Patents

Description

  The present invention relates to a heat pipe having excellent sealing properties inside a container and a method for manufacturing the heat pipe.

  2. Description of the Related Art Electronic components such as semiconductor elements mounted on electric / electronic devices have increased heat generation due to high-density mounting and the like accompanying higher functionality, and their cooling has become more important. As a method for cooling electronic components, a heat pipe may be used.

  In recent years, from the viewpoint of reducing the weight of a heat pipe, aluminum or an aluminum alloy may be used instead of copper as a container material. As the working fluid sealed in the container, water may be used because of its excellent heat transport characteristics. However, if water is used as a working fluid in a container made of aluminum or an aluminum alloy, the chemical reaction between the aluminum or aluminum alloy and the water may generate hydrogen gas, which may reduce the degree of vacuum inside the heat pipe. There was a problem. Further, there is a problem that the container may be corroded by a chemical reaction between aluminum or an aluminum alloy and water.

  Therefore, when aluminum or an aluminum alloy is used as a container material and water is used as a working fluid, a coating layer having an anticorrosion function has been conventionally formed on the entire inner surface of the container.

  As a heat pipe formed with a coating layer having a corrosion protection function for a container, for example, a heat pipe in which a heat medium is sealed in a pipe made of an aluminum alloy containing an alkali metal and / or an alkaline earth metal, A heat pipe in which an oxide film containing an alkali metal oxide and / or an alkaline earth metal oxide is formed on the inner surface of the tube (Patent Document 1).

  However, since the coating layer having the anticorrosion function of the container, such as the above-mentioned oxide film, has a hard property, in Patent Document 1, in sealing the container end, by bending or compressing the container end, In some cases, cracks were generated in the coating layer at the end of the container or in the vicinity of the end to expose the container, and the corrosion of the container progressed from the crack. In addition, when sealing the container end, a new surface is generated at the container end or in the vicinity of the end by heat treatment such as welding of the container end, and when a working fluid including water is enclosed, the new surface of the container and the water are mixed. In some cases, hydrogen gas was generated due to a chemical reaction, and the degree of vacuum was reduced.

JP-A-9-96494

  In view of the above circumstances, an object of the present invention is to provide a container made of aluminum or an aluminum alloy that is subjected to a bending process or a heat treatment for sealing, and that the container end portion is corroded by a working fluid containing water. An object of the present invention is to provide a heat pipe capable of preventing generation of hydrogen gas and a method for manufacturing the heat pipe.

  An aspect of the present invention is a container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid sealed in the container, wherein the working fluid includes water, and the container includes A first protective layer provided on the inner surface side of the end of the container base material, and a second protective layer provided between the first protective layer and the inner surface of the container base material, The first protective layer is a heat pipe having a lower melting point than the second protective layer.

  An aspect of the present invention is a container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid sealed in the container, wherein the working fluid includes water, and the container includes A first protective layer provided on the inner surface side of the end of the container base material, and a second protective layer provided between the first protective layer and the inner surface of the container base material, The first protective layer is a heat pipe having a lower Vickers hardness than the second protective layer.

  Vickers hardness (HV) is one type of indentation hardness, and is generally used as one of numerical values representing the hardness of an object. The Vickers hardness was determined by using a regular square pyramid diamond with a diagonal angle of 136 ° as an indenter, pushing the indenter into the material surface with a constant load, and determining the diagonal length of the dimple generated when the load was removed. This is a value obtained by determining the surface area of the depression from the length of the diagonal line and dividing the load by the calculated surface area. This Vickers hardness is represented by a numerical value without a unit.

  In the above aspect of the present invention, the protective layer having the multilayer structure (the first protective layer and the second protective layer) is provided on the inner surface of the end portion of the container base material, and the second protective layer is provided on the surface side of the second protective layer. The first protective layer has a lower Vickers hardness than the second protective layer. That is, of the protective layers having a multilayer structure, the first protective layer on the front surface is made of a material softer than the second protective layer between the first protective layer and the inner surface of the container.

  An embodiment of the present invention is a heat pipe in which the first protective layer has a Vickers hardness of 100 or more smaller than that of the second protective layer.

  An embodiment of the present invention is a heat pipe in which the first protective layer has a Vickers hardness of 100 or less.

  An embodiment of the present invention is a heat pipe in which the first protective layer has a higher elongation than the second protective layer.

  The “elongation” means the elongation measured by a tensile test specified in JIS Z 2241.

  An embodiment of the present invention is the heat pipe, wherein the first protective layer is at least one selected from the group consisting of a tin layer, a tin alloy layer, a solder layer, and a resin layer.

  An embodiment of the present invention is a heat pipe in which the resin layer is an elastomeric resin layer.

  An embodiment of the present invention is the heat pipe, wherein the second protective layer is at least one selected from the group consisting of an alumite layer, a chromium plating layer, a nickel plating layer, a boehmite layer, and a glass coat layer.

  An aspect of the present invention is a method of manufacturing a container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid including water sealed in the container, wherein an inner end surface of the container base material is provided. A container having an uncured thermosetting resin layer provided on the side and a second protective layer provided between the uncured thermosetting resin layer and the inner surface of the container base material is prepared. Performing the step of deaeration of the interior of the container, the step of pressing the degassed end of the container by plastic deformation, and the step of melting the pressed end of the container to the melting point of the container base material. Heating the thermosetting resin by heating at a temperature of less than to form a first protective layer and sealing the end portion, wherein the first protective layer comprises: Vickers harder than the second protective layer Small, is a method of manufacturing a heat pipe.

  An aspect of the present invention is a method of manufacturing a container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid including water sealed in the container, wherein an inner end surface of the container base material is provided. And a precursor layer of a first protective layer comprising a tin layer, a tin alloy layer, a solder layer or a thermoplastic resin layer, and a precursor layer of the first protective layer and an inner surface of the container substrate. A step of preparing a container having a second protective layer provided therebetween, a step of degassing the inside of the container, and a step of pressing the degassed end of the container by plastic deformation, Heating the pressed end portion of the container at a temperature lower than the melting point of the container base material to melt the precursor layer of the first protective layer; and melting the precursor layer of the first protective layer. To cool the first Forming a Mamoruso, and a step of sealing the ends of the container, said first protective layer is, the smaller the Vickers hardness than the second protective layer, a method of manufacturing a heat pipe.

  An aspect of the present invention is a method of manufacturing a container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid including water sealed in the container, wherein an inner end surface of the container base material is provided. A first protective layer, which is an elastomeric resin at 25 ° C., provided on the side, and a second protective layer provided between the first protective layer and the inner surface of the container substrate. A step of preparing a container having, a step of degassing the inside of the container, and a step of pressing the degassed end of the container by plastic deformation to seal the end, A method for manufacturing a heat pipe, wherein the first protective layer has a lower Vickers hardness than the second protective layer.

  An embodiment of the present invention is a method for manufacturing a heat pipe, further comprising a step of compressing the pressed end without bending it before sealing the end.

  An embodiment of the present invention is a method of manufacturing a heat pipe, wherein the second protective layer is at least one selected from the group consisting of an alumite layer, a chromium plating layer, a nickel plating layer, a boehmite layer, and a glass coat layer. .

  According to the aspect of the present invention, since the first protective layer has a lower melting point than the second protective layer having an anticorrosion function, the first protective layer is more easily melted by heating than the second protective layer. Therefore, in sealing the end portion of the container base material by plastic deformation such as bending and heating, even if a crack occurs in the second protective layer 12, it is formed closer to the surface than the second protective layer. The first protective layer can cover cracks generated in the second protective layer. Since the first protective layer can cover cracks generated in the second protective layer, corrosion of the container base material due to a chemical reaction between the working fluid containing water and the container base material can be prevented. Furthermore, since the corrosion of the container base material by the working fluid containing water can be prevented, a decrease in the degree of vacuum due to the generation of hydrogen gas can be prevented, and a decrease in the heat transport performance of the heat pipe can be prevented.

  According to the aspect of the present invention, since the first protective layer has a lower Vickers hardness than the second protective layer having an anticorrosion function, cracks are formed in the first protective layer as compared with the second protective layer. Less likely to occur. Therefore, even when a crack occurs in the second protective layer when the container end is sealed by bending or compression processing, the second protective layer is formed on the surface side of the second protective layer more than the second protective layer. The formed first protective layer can cover cracks generated in the second protective layer. Since the first protective layer can cover cracks generated in the second protective layer, corrosion of the container base material due to a chemical reaction between the working fluid containing water and the container base material can be prevented. Furthermore, since the corrosion of the container base material by the working fluid containing water can be prevented, a decrease in the degree of vacuum due to the generation of hydrogen gas can be prevented, and a decrease in the heat transport performance of the heat pipe can be prevented.

  According to the aspect of the present invention, in sealing the container end portion, even if a new surface is generated in the container base material due to the heat treatment of the container end portion, the new protection surface covers the new base material surface of the container base material. Therefore, generation of hydrogen gas due to a chemical reaction between the working fluid containing water and the new surface can be prevented, and as a result, a reduction in the degree of vacuum of the heat pipe can be prevented, and a reduction in the heat transport performance of the heat pipe can be prevented. Can be.

  According to the aspect of the present invention, since the first protective layer has a Vickers hardness of 100 or more smaller than that of the second protective layer, the first protective layer can be formed by cracks or container bases generated in the second protective layer. Can be reliably coated over a long period of time.

  According to the aspect of the present invention, since the first protective layer has a Vickers hardness of 100 or less, it is possible to reliably prevent the first protective layer from cracking while having mechanical strength such as durability. It is possible to reliably cover cracks generated in the second protective layer.

  According to the aspect of the present invention, since the first protective layer has a larger elongation than the second protective layer, cracks generated in the second protective layer and a newly formed surface of the container base material can be formed over a long period of time. Can be coated reliably.

  According to an embodiment of the present invention, by heating at a temperature lower than the melting point of aluminum or aluminum alloy, which is the material of the container base, by thermosetting the uncured thermosetting resin, or tin, tin alloy, After the solder or thermoplastic resin is melted, the first protective layer is formed on the second protective layer by further cooling to form the first protective layer and seal the end of the container. Since the cracks and the newly formed surface of the container base material can be covered, the corrosion of the container end portion, and thus the entire container, can be prevented.

  According to the aspect of the present invention, the first protective layer, which is an elastomeric resin at room temperature (25 ° C.), seals the container end by pressing the container end by plastic deformation and pressing the container end. Since the first protective layer can cover cracks generated in the second protective layer, it is possible to prevent corrosion of the end of the container and thus the entire container.

It is a side sectional view of a heat pipe concerning an example of an embodiment of the present invention. It is an explanatory view of a method for manufacturing a heat pipe according to the first embodiment of the present invention. It is explanatory drawing of the manufacturing method of the heat pipe which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat pipe which concerns on 3rd Embodiment of this invention.

  Hereinafter, a heat pipe according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a heat pipe 1 according to an embodiment of the present invention includes a container including a container base material 10 made of aluminum or an aluminum alloy, and a working fluid 13 sealed in the container. A first protective layer 11 is provided on the inner surface of the end portion 14 of the device 10. Further, between the first protective layer 11 and the inner surface of the container substrate 10, a second protective layer 12, which is a coating for preventing corrosion of the inner surface of the container substrate, is provided.

  The shape of the container base material 10 in the radial direction is not particularly limited, but the heat pipe 1 is a tubular material having a circular shape in the radial direction. Sealing portions 15 are formed at both ends 14 of the container substrate 10 by pressing the inner surfaces of both ends 14 of the container substrate 10 by plastic deformation. In the heat pipe 1, the working fluid 13 contains water.

  At both ends 14 of the container substrate 10, the inner surface of the container substrate 10 is covered with the first protective layer 11. The inner surface of the entire container base material 10, that is, both end portions 14 and the central portion of the container base material 10 are entirely covered with the second protective layer 12. Therefore, at both ends 14 of the container base material 10, a multilayer structure 16 having the first protective layer 11 and the second protective layer 12 is formed, and the surface of the second protective layer 12 is the first protective layer 11. The embodiment is covered with the protective layer 11. From the above, in the multilayer structure 16, the first protective layer 11 is disposed on the surface side of the multilayer structure 16, that is, on the inner space side of the container base 10, and the second protective layer 12 is disposed on the bottom side of the multilayer structure 16. That is, it is arranged on the inner wall surface side of the container base material 10.

  On the other hand, the central portion of the container base material 10 where the first protective layer 11 is not provided has a single-layer structure including the second protective layer 12.

  The heat pipe 1 has an aspect in which the melting point of the first protective layer 11 is lower than the melting point of the second protective layer 12. Therefore, when the end of the container base material 10 is sealed by plastic deformation such as bending and heating and heating, even if a crack occurs in the second protective layer 12, the coating provided on the surface of the second protective layer 12. The first protective layer, which is a layer, can cover cracks generated in the second protective layer. Further, the heat pipe 1 has an aspect in which the Vickers hardness of the first protective layer 11 is smaller than the Vickers hardness of the second protective layer 12. Therefore, the first protective layer 11 is made of a material that is softer than the second protective layer 12 and is less likely to crack. Therefore, in sealing the end portion 14 of the container base material 10 by bending or the like, even if a crack occurs in the second protective layer 12, the second protective layer 12 is a coating layer provided on the surface of the second protective layer 12. The first protective layer 11 can cover cracks generated in the second protective layer 12. As described above, since the first protective layer 11 can cover the cracks generated in the second protective layer 12, the corrosion of the end portion 14 of the container base material 10 and thus the end portion 14 of the container base material 10 from the end portion 14 to the whole. The progress of corrosion can be prevented.

  The difference between the Vickers hardness of the first protective layer 11 and the Vickers hardness of the second protective layer 12 is not particularly limited as long as the Vickers hardness of the first protective layer 11 is smaller than the Vickers hardness of the second protective layer 12. If there is a difference of 100 or more from the examination of materials that can be practically used as described later, it is possible to prevent corrosion of the container base material 10, and it is more preferable that there is a difference of 200 or more. The Vickers hardness of the first protective layer is not particularly limited, but is preferably 100 or less, particularly preferably 70 or less from the viewpoint of reliably covering the cracks of the second protective layer 12.

  The difference between the elongation rate of the first protective layer 11 and the elongation rate of the second protective layer 12 is not particularly limited as long as the elongation rate of the first protective layer 11 is larger than the elongation rate of the second protective layer 12. The difference of 70% or more is particularly preferable from the viewpoint of reliably preventing the first protective layer 11 from cracking.

  The thickness of the first protective layer 11 is not particularly limited, but is preferably 1 μm to 15 μm. The thickness of the second protective layer 12 is not particularly limited, but is preferably 1 μm to 50 μm.

  Specific examples of the first protective layer 11 include a tin layer, a tin alloy layer, a solder layer, and a resin layer. Further, as the resin layer, for example, a resin layer formed of a thermosetting resin thermosetting at a temperature lower than the melting point of aluminum or an aluminum alloy, a thermoplastic plasticizing at a temperature lower than the melting point of aluminum or an aluminum alloy A resin layer formed from a resin, a resin layer formed from a resin having an elastomeric property at room temperature (25 ° C.), and the like can be given.

  In sealing the end portion 14 of the container substrate 10 in the first protective layer 11 by bending or the like, the first protective layer 11 is embedded in cracks generated in the second protective layer 12. A tin layer, a tin alloy layer, a solder layer, a thermoplastic resin layer, and a thermosetting resin layer are preferable because cracks can be reliably closed. Further, among the first protective layers 11, as described later, a resin having an elastomeric property at normal temperature (25 ° C.) from the point that heat treatment is not required for manufacturing the heat pipe 1 and production efficiency is excellent, as described later. Layers are preferred.

  The thermosetting resin is not particularly limited, and examples thereof include an epoxy resin, a phenol resin, a (meth) acrylic resin, a urethane resin, and a melamine resin. The thermoplastic resin is not particularly limited, and examples thereof include polyamide resin, polyolefin such as polyethylene and polypropylene, and polycarbonate. The resin having an elastomeric property at ordinary temperature (25 ° C.) is not particularly limited, and examples thereof include synthetic rubber and natural rubber such as urethane rubber, butadiene rubber, styrene / butadiene rubber, nitrile rubber, butyl rubber, and silicone rubber. Can be

  The second protective layer 12 is a layer that prevents the inner surface of the container substrate 10 made of aluminum or an aluminum alloy from being corroded by the working fluid 13 containing water. The corrosion prevention layer on the inner surface of the container substrate 10 is not particularly limited, and examples thereof include an alumite layer, a chromium plating layer, a nickel plating layer, a boehmite layer, and a glass coat layer.

  Next, an example of a method for manufacturing a heat pipe of the present invention will be described.

  First, FIG. 2 illustrates an example of a method of manufacturing the heat pipe 1 according to the above-described embodiment (a manufacturing method according to the first embodiment) when a thermosetting resin is used as the first protective layer 11. It will be described using FIG.

  In the manufacturing method according to the first embodiment, first, as shown in FIG. 2A, the uncured thermosetting resin layer 11 ′ applied to the end 14 of the container base material 10 and the second A container including a container base material 10 which is a tube material in which a multilayer portion 16 ′ having the protective layer 12 is formed and a single-layer structure including the second protective layer 12 is formed in the center is prepared. The inside of the container is evacuated by performing a deaeration process 26 such as evacuation or heat deaeration from one end 14 of the container including the container base material 10. At this time, the other end of the container (not shown) is sealed in advance by an appropriate sealing means.

  Next, as shown in FIG. 2B, the end portion 14 is compressed by caulking or the like along the radial direction of the container base material 10 by the first plastic working means 20 while performing the deaeration process 26. Then, the inner surface of the end portion 14 of the container base material 10 is pressed against in a manner via the multilayer portion 16 ′ to form a pressed portion 21 (sealed portion) at the end portion 14. The fluid 13 is sealed.

  Next, as shown in FIG. 2C, the deaeration process 26 is stopped, and the container base material 10 is cut on one end 14 side of the press-contact portion 21 by using a cutting means 22 such as a cutter. Cut the containing container.

  Next, as shown in FIG. 2 (d), after the press-contact portion 21 is bent, the bent region of the press-contact portion 21 is moved in the radial direction of the container base material 10 by the second plastic working means 23. On the other hand, it is compressed in a parallel direction or a substantially parallel direction by caulking or the like to cause plastic deformation.

  Next, as shown in FIGS. 2 (e) and 2 (f), the uncured thermosetting resin layer 11 'is heated by the heating means 24 at a temperature lower than the melting point of aluminum or aluminum alloy. Thermosetting resin layer 11 'is thermally cured to obtain a first protective layer 11, which is a cured thermosetting resin layer, comprising a first protective layer 11 and a second protective layer 12. An end 14 having a structure 16 is formed.

  As an appropriate sealing means for the other end (not shown), for example, as in the case of the one end 14, the other end on which the multilayer portion 16 'is formed is formed by the first plastic working. A sealing method using the means 20, the cutting means 22, the second plastic working means 23, and the heating means 24 may be used. By the manufacturing method according to the first embodiment, the heat pipe 1 in which the first protective layer 11 has a lower melting point and a lower Vickers hardness than the second protective layer 12 can be manufactured.

  In FIG. 2D, the press-contact portion 21 is plastically deformed by the second plastic working means 23 after being bent, but instead, the press-contact portion 21 is subjected to the second plastic working without bending. The means may be plastically deformed. Further, the heating means 24 in FIG. 2E is not particularly limited, and examples thereof include a heating furnace, a dryer, and welding.

  Next, when tin, tin alloy, solder or thermoplastic resin is used as the first protective layer 11, an example of the method of manufacturing the heat pipe 1 according to the above-described embodiment (the manufacturing according to the second embodiment) The method will be described with reference to FIG.

  In the manufacturing method according to the second embodiment, first, as shown in FIG. 3A, a tin layer, a tin alloy layer, a solder layer, or a thermoplastic resin provided at an end portion 14 of the container base material 10. A multi-layer portion 16 "having a first protective layer precursor layer 11" and a second protective layer 12 as a base of the first protective layer 11 is formed, and a second protective layer is formed at the center. A container including a container base material 10 which is a tube material having a single-layer structure composed of a layer 12 is prepared. The inside of the container is evacuated by performing a deaeration process 26 such as evacuation or heat deaeration from one end 14 of the container including the container base material 10. At this time, the other end of the container (not shown) is sealed in advance by an appropriate sealing means.

  Next, as shown in FIG. 3B, the end portion 14 is compressed along the radial direction of the container base material 10 by caulking or the like by the first plastic working means 20 while performing the deaeration process 26. Then, the inner surface of the end portion 14 of the container base material 10 is brought into pressure contact with the multi-layer portion 16 ″ so as to form a press-contact portion 21 (sealed portion) at the end portion 14 by plastic deformation. The working fluid 13 is sealed.

  Next, as shown in FIG. 3C, the degassing process 26 is stopped, and the container including the container base material 10 is cut using the cutting means 22 on one end 14 side of the press contact portion 21. Disconnect.

  Next, as shown in FIG. 3D, the press-contact portion 21 is compressed by a second plastic working means 23 in a direction parallel or substantially parallel to the radial direction of the container base material 10 by caulking or the like. Plastic deformation.

  Next, as shown in FIG. 3 (e), a first protection layer made of a tin layer, a tin alloy layer, a solder layer or a thermoplastic resin layer is heated by a heating means 24 at a temperature lower than the melting point of aluminum or an aluminum alloy. The precursor layer 11 ″ of the layer is heated to melt the precursor layer 11 ″ of the first protective layer.

  Next, as shown in FIG. 3F, the molten precursor layer ″ of the first protective layer is cooled to room temperature to obtain a first protective layer 11, and the first protective layer 11 and the second The end portion 14 having the multilayer structure 16 including the protective layer 12 is formed.

  As an appropriate sealing means for the other end (not shown), for example, as in the case of the one end 14, the other end on which the multilayer portion 16 '' is formed is made of a first plastic material. A sealing method using the processing means 20, the cutting means 22, the second plastic working means 23, and the heating means 24 is exemplified. The heat pipe 1 in which the first protective layer 11 has a lower melting point and lower Vickers hardness than the second protective layer 12 can be manufactured by the manufacturing method according to the second embodiment.

  In FIG. 3D, the press-contact portion 21 is plastically deformed by the second plastic working means 23 without bending. However, instead of this, the press-contact portion 21 is bent and then subjected to the second plastic working. The means may be plastically deformed. Further, the heating means 24 in FIG. 3E is not particularly limited, and examples thereof include a heating furnace, a dryer, and welding. In FIG. 3E, welding is used as the heating means 24, and the side surface of the press-contact portion 21 is welded to form a weld 25. The means for cooling in FIG. 3 (f) is not particularly limited, and includes, for example, cooling at room temperature.

  The step of plastic deformation shown in FIG. 3D and the step of heating at a temperature lower than the melting point of the container base material 10 made of aluminum or an aluminum alloy shown in FIG. 3E may be performed simultaneously. By doing so, it is possible to reliably prevent cracks generated in the second protective layer 12 during the plastic deformation of the container base material 10 from reaching the precursor layer 11 ″ of the first protective layer. Thereby, the first protective layer 11 formed by heating and cooling can surely cover the crack generated in the second protective layer 12.

  Next, when the elastomeric resin is used at room temperature (25 ° C.) as the first protective layer 11, the example of the method of manufacturing the heat pipe 1 according to the above-described embodiment (according to the third embodiment) The manufacturing method will be described with reference to FIG.

  In the manufacturing method according to the third embodiment, first, as shown in FIG. 4A, an elastomeric resin layer 11 ′ ″ is formed on the end portion 14 of the container base material 10 at room temperature (25 ° C.). A container including a container base material 10 which is a tubular member in which a multilayer portion 16 ″ ′ having the second protective layer 12 is formed and a single-layer structure including the second protective layer 12 is formed in the center portion is prepared. . The inside of the container is evacuated by performing a deaeration process 26 such as evacuation or heat deaeration from one end 14 of the container including the container base material 10. At this time, the other end of the container (not shown) is sealed in advance by an appropriate sealing means.

  Next, as shown in FIG. 4B, the end portion 14 is compressed along the radial direction of the container base material 10 by caulking or the like by the first plastic working means 20 while performing the deaeration process 26. Then, the inner surface of the end portion 14 of the container base material 10 is pressed in a manner via the multilayer portion 16 ′ ″ ′ to form a pressed portion 21 (sealed portion) at the end portion 14. The working fluid 13 is sealed.

  Next, as shown in FIG. 4 (c), the deaeration process 26 is stopped, and the container including the container base material 10 is cut using the cutting means 22 on one end 14 side of the press contact portion 21. Disconnect.

  Next, as shown in FIG. 4 (d), after the press-contact portion 21 is bent, the region of the press-contact portion 21 that has been bent by the second plastic working means 23 is moved in the radial direction of the container base material 10. On the other hand, it is compressed in a parallel direction or a substantially parallel direction by caulking or the like to cause plastic deformation.

  By the above process, as shown in FIG. 4E, the first protective layer 11 made of the elastomeric resin layer 11 ′ ″ was obtained at room temperature (25 ° C.) without using any heating means. The end portion 14 having the multilayer structure 16 including the protective layer 11 and the second protective layer 12 is formed.

  As the appropriate sealing means for the other end (not shown), for example, as in the case of the one end 14, the other end on which the multilayer portion 16 '' 'is formed may be a first end. A method of using plastic working means 20, cutting means 22, and second plastic working means 23 and sealing without using a heating means can be given. By the manufacturing method according to the third embodiment, the heat pipe 1 in which the first protective layer 11 has a lower melting point and a lower Vickers hardness than the second protective layer 12 can be manufactured.

  In FIG. 4 (d), the bent portion is plastically deformed by the second plastic working means 23 after the press-contact portion 21 is bent. May be plastically deformed by the plastic working means 23. Furthermore, after plastic deformation by the second plastic working means 23, the side face of the press-contact portion 21 is welded to provide a welded portion, so that the sealing performance of the end portion 14 may be further improved.

  Next, another embodiment of the heat pipe of the present invention will be described. In the heat pipe according to the above-described embodiment, the multilayer structure provided on the inner surface of the end of the container base material has a two-layer structure including the first protective layer and the second protective layer. The first protective layer may be provided, for example, between the second protective layer and the inner surface of the container base material, further layers different from the first protective layer and the second protective layer may be provided. An additional layer different from the first protective layer and the second protective layer may be provided between the first protective layer and the second protective layer. Further, in the heat pipe according to the embodiment, the central portion of the container has a single-layer structure including the second protective layer, but may have a structure of two or more layers, for example, the second protective layer and the container base material. Between the first protective layer and the second protective layer, a first protective layer and a second protective layer may be provided on the surface of the second protective layer. Further layers different from the above may be provided.

  In the heat pipe according to the above embodiment, the first protective layer and the second protective layer are provided at both ends, but instead of this, the first protective layer is provided only at one of the ends. And a second protective layer.

  Further, in the heat pipe according to the above embodiment, the container base material is a tubular material having a circular shape in the radial direction. Alternatively, the container base material may be a flat tubular material such as an elliptical shape in the radial direction. Alternatively, a flat container base material may be used.

  The heat pipe of the present invention can prevent corrosion of the container end portion, and thus the entire container, even if a working fluid containing water is sealed in a container including a container base material made of aluminum or an aluminum alloy. It can be used, for example, and has high utility value in the field of cooling electronic components.

DESCRIPTION OF SYMBOLS 1 Heat pipe 10 Container base material 11 First protective layer 12 Second protective layer 13 Working fluid

Claims (13)

A container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid sealed in the container,
The working fluid includes water,
The container, a first protective layer provided on the inner surface side of the end of the container base material, a second protective layer provided between the first protective layer and the inner surface of the container base material, the a, the first protective layer, the melting point is rather low than the second protective layer,
On the inner surface of the end portion of the container base material, a sealing portion pressed by plastic deformation is formed,
A multilayer structure having the first protective layer and the second protective layer is formed at an end of the container base material, and the first protective film is disposed on the surface of the multilayer structure, and A single-layer structure composed of the second protective layer is formed at a central portion of the container substrate that is exposed to the internal space of the substrate and is not provided with the first protective layer,
A heat pipe in which the first protective layer covers cracks generated in the second protective layer . A container including a container base material made of aluminum or an aluminum alloy, and a heat pipe having a working fluid sealed in the container,
The working fluid includes water,
The container, a first protective layer provided on the inner surface side of the end of the container base material, a second protective layer provided between the first protective layer and the inner surface of the container base material, the a, the first protective layer, the Vickers hardness than the second protective layer is rather small,
On the inner surface of the end portion of the container base material, a sealing portion pressed by plastic deformation is formed,
A multilayer structure having the first protective layer and the second protective layer is formed at an end of the container base material, and the first protective film is disposed on the surface of the multilayer structure, and A single-layer structure composed of the second protective layer is formed at a central portion of the container substrate that is exposed to the internal space of the substrate and is not provided with the first protective layer,
A heat pipe in which the first protective layer covers cracks generated in the second protective layer .   3. The heat pipe according to claim 2, wherein the first protective layer has a Vickers hardness lower by 100 or more than the second protective layer. 4.   The heat pipe according to claim 2, wherein the first protective layer has a Vickers hardness of 100 or less.   The heat pipe according to claim 2, wherein the first protective layer has a larger elongation than the second protective layer.   The heat pipe according to any one of claims 1 to 5, wherein the first protective layer is at least one selected from the group consisting of a tin layer, a tin alloy layer, a solder layer, and a resin layer.   The heat pipe according to claim 6, wherein the resin layer is an elastomeric resin layer.   8. The method according to claim 1, wherein the second protective layer is at least one selected from the group consisting of an alumite layer, a chromium plating layer, a nickel plating layer, a boehmite layer, and a glass coat layer. 9. heat pipe. A container including a container base material made of aluminum or an aluminum alloy, and a method of manufacturing a heat pipe having a working fluid including water sealed in the container,
An uncured thermosetting resin layer provided on the inner side of the end portion of the container base material, and a second provided between the uncured thermosetting resin layer and the inner surface of the container base material. Providing a container having a protective layer;
Degassing the interior of the container;
Pressing the degassed end of the container by plastic deformation,
The pressed end portion of the container is heated at a temperature lower than the melting point of the container base material to thermally cure the thermosetting resin, thereby forming a first protective layer, and sealing the end portion. The process of
Including
The first protective layer, rather small, Vickers hardness than the second protective layer,
On the inner surface of the end portion of the container base material, a sealing portion pressed by plastic deformation is formed,
A multilayer structure having the first protective layer and the second protective layer is formed at an end of the container base material, and the first protective film is disposed on the surface of the multilayer structure, and A single-layer structure composed of the second protective layer is formed at a central portion of the container substrate that is exposed to the internal space of the substrate and is not provided with the first protective layer,
A method for manufacturing a heat pipe, wherein the first protective layer covers cracks generated in the second protective layer . A container including a container base material made of aluminum or an aluminum alloy, and a method of manufacturing a heat pipe having a working fluid including water sealed in the container,
A precursor layer of a first protective layer made of a tin layer, a tin alloy layer, a solder layer or a thermoplastic resin layer, provided on the inner side of the end of the container base material, and a precursor layer of the first protective layer. Preparing a container having a second protective layer provided between the container base material and an inner surface thereof;
Degassing the interior of the container;
Pressing the inner surface of the degassed container end by plastic deformation,
Heating the pressed end of the container at a temperature lower than the melting point of the container base material to melt the precursor layer of the first protective layer;
Cooling the molten precursor layer of the first protective layer to form a first protective layer, and sealing the end;
Including
The first protective layer, rather small, Vickers hardness than the second protective layer,
On the inner surface of the end portion of the container base material, a sealing portion pressed by plastic deformation is formed,
A multilayer structure having the first protection layer and the second protection layer is formed at an end of the container base material, and the first protection film is disposed on a surface of the multilayer structure, and the container A single-layer structure composed of the second protective layer is formed at a central portion of the container substrate that is exposed to the internal space of the substrate and is not provided with the first protective layer,
A method of manufacturing a heat pipe, wherein the first protective layer covers cracks generated in the second protective layer . A container including a container base material made of aluminum or an aluminum alloy, and a method of manufacturing a heat pipe having a working fluid including water sealed in the container,
A first protective layer, which is an elastomeric resin at 25 ° C., provided on the inner surface side of the end of the container base material, and is provided between the first protective layer and the inner surface of the container base material. Preparing a container having a second protective layer,
Degassing the interior of the container;
A step of pressing the inner surface of the degassed container end by plastic deformation to seal the end portion,
Including
The first protective layer, rather small, Vickers hardness than the second protective layer,
On the inner surface of the end portion of the container base material, a sealing portion pressed by plastic deformation is formed,
A multilayer structure having the first protective layer and the second protective layer is formed at an end of the container base material, and the first protective film is disposed on the surface of the multilayer structure, and A single-layer structure composed of the second protective layer is formed at a central portion of the container substrate that is exposed to the internal space of the substrate and is not provided with the first protective layer,
A method for manufacturing a heat pipe, wherein the first protective layer covers cracks generated in the second protective layer .   The method for manufacturing a heat pipe according to any one of claims 9 to 11, further comprising, before sealing the end portion, compressing the bent end portion without bending the end portion.   13. The method according to claim 9, wherein the second protective layer is at least one selected from the group consisting of an alumite layer, a chromium plating layer, a nickel plating layer, a boehmite layer, and a glass coat layer. Heat pipe manufacturing method.

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