WO2017208581A1

WO2017208581A1 - Method for producing heat pipe

Info

Publication number: WO2017208581A1
Application number: PCT/JP2017/011705
Authority: WO
Inventors: 清多郎鷲塚; 義博川口; 隆司北村
Original assignee: 株式会社村田製作所
Priority date: 2016-05-30
Filing date: 2017-03-23
Publication date: 2017-12-07
Also published as: JPWO2017208581A1; CN109312989B; CN109312989A; JP6721045B2

Abstract

The present invention provides a method for producing a heat pipe, the method being characterized by comprising a step for preparing a bar-shaped wick structure that comprises an intermetallic compound of a first metal, which is, Sn or a Sn alloy and a second metal, which is, a Cu alloy; a step for inserting the wick structure into a pipe-shaped container; and a step for fixing the wick structure in the container, with the gap being left between the inner wall of the container and the wick structure by deforming the container.

Description

Heat pipe manufacturing method

The present invention relates to a method for manufacturing a heat pipe.

The heat pipe is used for cooling a CPU mounted on an electronic device such as a personal computer. The heat pipe is a sealed metal body in which a non-condensable fluid is degassed and an appropriate amount of hydraulic fluid is enclosed. The hydraulic fluid enclosed in the container evaporates by being heated from the outside of the container in the evaporating unit, and is condensed by being cooled in the condensing unit when the vapor is cooled, and transports heat as latent heat. Since heat is transported as latent heat, heat can be transported even with a small temperature difference between the evaporation section and the condensation section.

In the container, it is necessary to return the working fluid condensed in the condensing part to the evaporation part. When the evaporating part is located above the condensing part, or when the evaporating part and the condensing part are located horizontally, the surface tension of the working fluid is used for the reflux of the working fluid. Therefore, a wick structure is required inside the container.

As the wick structure, a linear body in which a large number of fine wires are bundled, a mesh body such as a mesh, or a sintered body obtained by sintering metal powder such as copper powder is used. It is known that those using a sintered body of metal powder can obtain a high surface tension.

For example, in Patent Document 1, a core rod having a notch is inserted into a container, and a space formed by the notch portion of the core rod and the inner wall of the container is filled with metal powder. A method of manufacturing a heat pipe is disclosed in which a container is heated with the core inserted, a core rod is pulled out of the container, the container is flattened, and a working fluid is sealed in the container.

JP 2009-68787 A

In the method described in Patent Document 1, the container is heated in a state where the metal powder and the core rod are inserted, so that the metal powder is sintered to form a sintered metal, and the sintered metal is fixed to the container. be able to. However, when fixing a sintered metal to a container by heating, there exists a problem that a core rod and a sintered metal will adhere and it will become difficult to pull out a core rod.

If the core rod cannot be easily pulled out from the container, the time for manufacturing the heat pipe becomes longer, which causes a problem that the productivity of the heat pipe decreases.

The present invention has been made to solve the above-described problem, and a heat pipe manufacturing method that does not require the core rod to be pulled out from the container, or a heat pipe manufacturing method that can easily pull out the core rod from the container. The purpose is to provide.

The present inventors considered using an intermetallic compound of Sn or Sn alloy as the first metal and Cu alloy as the second metal having a higher melting point than the first metal as the wick structure. When the first metal (for example, Sn) and the second metal (for example, Cu—Ni alloy) are heated, the first metal melts when the temperature reaches the melting point of the first metal or higher. When the heating is further continued, the first metal and the second metal react to produce an intermetallic compound (for example, (Cu, Ni) ₆ Sn ₅ ). Since voids (pores) are generated when the intermetallic compound part is formed, the intermetallic compound becomes porous suitable for the wick structure.

The method of manufacturing a heat pipe according to the first embodiment of the present invention includes a step of preparing a rod-like wick structure made of an intermetallic compound of Sn or Sn alloy as a first metal and Cu alloy as a second metal. And inserting the wick structure into a tubular container, and deforming the container, leaving a gap between the inner wall of the container and the wick structure, and the above in the container. And a step of fixing the wick structure.

In the first embodiment of the present invention, a heat pipe can be manufactured without pulling out a core rod from a container by preparing a rod-like wick structure and inserting and fixing it into a tubular container. it can.

In the first embodiment of the present invention, in the step of preparing the wick structure, it is preferable to produce the wick structure by heating a metal powder containing the first metal and the second metal.
For example, when producing a sintered body of copper powder as a wick structure, it is necessary to sinter at a high temperature of about 900 ° C. Therefore, it is necessary to separately produce a wick structure before inserting into a container. It was not done. On the other hand, when a wick structure made of an intermetallic compound of a first metal and a second metal is manufactured, heating is performed at a low temperature of about 300 ° C., so that the wick structure is easily manufactured. Can do.

The manufacturing method of the heat pipe which concerns on 2nd Embodiment of this invention is the process of preparing the metal rod which consists of Sn or Sn alloy which is a 1st metal, and the space between the inner wall of a tubular container, and the said metal rod. A step of inserting the metal rod and the metal powder into the container so that the metal powder containing a Cu alloy as the second metal is filled; and the metal rod and the metal powder inserted into the container. By heating the first metal constituting the metal rod and the second metal contained in the metal powder to form a wick structure made of an intermetallic compound, and in the container And a step of forming a void.

In 2nd Embodiment of this invention, it replaces with the conventionally used core bar, the metal bar which consists of 1st metals is used, and this metal bar and the metal powder containing a 2nd metal are inserted in a container. By heating the metal rod and metal powder inserted in the container, the first metal constituting the metal rod reacts with the second metal contained in the metal powder to form a wick structure made of an intermetallic compound. As the metal rod disappears, a void is formed in the container. Therefore, the heat pipe can be manufactured without pulling out the core rod from the container.

In the second embodiment of the present invention, in the step of inserting the metal rod and the metal powder, after inserting the metal rod into the container, the metal is inserted into a space between the inner wall of the container and the metal rod. Powder may be filled. Further, in the step of inserting the metal rod and the metal powder, after the metal powder is filled in the container, the metal rod is inserted into the container so as to extrude the metal powder in the container. Good. Furthermore, in the step of inserting the metal rod and the metal powder, the metal powder may be inserted into the container after the metal powder is adhered around the metal rod.

The method for manufacturing a heat pipe according to the third embodiment of the present invention includes a step of preparing a mesh sheet containing Sn or Sn alloy as the first metal and Cu alloy as the second metal, and an inner wall of the tubular container. And inserting the mesh sheet into the container and heating the mesh sheet inserted into the container, thereby forming the first metal and the second metal constituting the mesh sheet. And reacting to form a wick structure composed of an intermetallic compound.

In 3rd Embodiment of this invention, the mesh sheet containing a 1st metal and a 2nd metal is inserted in a container so that the inner wall of a container may be followed. By heating the mesh sheet inserted into the container, the first metal and the second metal constituting the mesh sheet react to form a wick structure made of an intermetallic compound. Therefore, the heat pipe can be manufactured without pulling out the core rod from the container.

In the third embodiment of the present invention, in the step of preparing the mesh sheet, it is preferable to produce the mesh sheet by plating the first metal on a mesh made of the second metal. In the step of preparing the mesh sheet, the mesh sheet is preferably prepared by attaching a metal powder containing the first metal to a mesh made of the second metal.
By using the mesh made of the second metal, the porosity of the wick structure formed after reacting with the first metal can be increased. When the metal powder is attached to the mesh, the porosity of the wick structure can be further increased.

The heat pipe manufacturing method according to the fourth embodiment of the present invention includes a step of preparing a core rod with a mesh in which a mesh made of a Cu alloy as a second metal is wound around the core rod, and an inner wall of a tubular container And the metal powder containing Sn or Sn alloy as the first metal and the second metal are filled in the space between the metal core and the mesh core. The first metal and the second metal contained in the metal powder are reacted with each other by heating the cored rod with mesh and the metal powder inserted into the container, and the step of inserting the container into the container. A step of reacting the first metal contained in the metal powder with the second metal constituting the core rod with mesh to form a wick structure made of an intermetallic compound; Characterized in that it comprises the the steps of pulling the mandrel from the antenna.

In the fourth embodiment of the present invention, since the mesh made of the second metal is wound around the core rod, when the first metal and the second metal react between the inner wall of the container and the core rod, The melted first metal is less likely to come into contact with the core rod, and adhesion between the core rod and the intermetallic compound is prevented. On the other hand, since the mesh wound around the core rod reacts with the first metal to form an intermetallic compound, it is fixed to the container. As a result, only the core rod can be pulled out from the container.

In the heat pipe manufacturing method according to the fifth embodiment of the present invention, at least the surface is made of a resin, and the resin is made by reacting Sn or Sn alloy as the first metal with Cu alloy as the second metal. Preparing a core rod having a melting point higher than the temperature at which the intermetallic compound is formed and having a thermal expansion coefficient larger than that of the intermetallic compound, an inner wall of a tubular container, and the core rod Inserting the core rod and the metal powder into the container so that the space between the metal powder containing the first metal and the second metal is filled; Heating the core rod and the metal powder to react the first metal and the second metal contained in the metal powder to form a wick structure made of an intermetallic compound; and From the container up Characterized in that it comprises a step of withdrawing the mandrel, the.

In the fifth embodiment of the present invention, the core rod material has a melting point higher than the temperature at which the intermetallic compound constituting the wick structure is generated, and a heat larger than the thermal expansion coefficient of the intermetallic compound. A resin having an expansion coefficient is used. Since such a resin expands when heated to form an intermetallic compound, a wick structure made of the intermetallic compound is formed while being pressed against the expanded resin. On the other hand, since the resin shrinks upon cooling after heating, a gap is generated between the wick structure and the core bar. Therefore, the core rod can be easily pulled out from the container.

In the fifth embodiment of the present invention, the resin is preferably a silicone resin.

In the heat pipe manufacturing method according to the sixth embodiment of the present invention, Sn or Sn alloy as the first metal and Cu alloy as the second metal are provided in the space between the inner wall of the tubular container and the core rod. A step of inserting the core rod and the metal powder into the container so as to be filled with the metal powder, and the metal powder in the container with the core rod inserted into the container. A step of reacting a part of the first metal and a part of the second metal contained in the metal powder to form an intermetallic compound by heating at a temperature lower than the melting point; A step of pulling out the rod, and heating the metal powder in the container in a state where the core rod is pulled out at a temperature equal to or higher than the melting point of the first metal, whereby the unreacted first metal powder contained in the metal powder. One metal and the second metal Is reacted, characterized in that it comprises a step of forming a wick structure comprising an intermetallic compound.

In the sixth embodiment of the present invention, a part of the metal powder is made an intermetallic compound by heating the metal powder at a temperature lower than the melting point of the first metal with the core rod inserted in the container. . As a result, since the shape of the metal powder is maintained and the metal powder is fixed in the container, the core rod can be pulled out from the container. After the core rod is pulled out, the remaining metal powder is heated at a temperature equal to or higher than the melting point of the first metal, whereby the unreacted first metal and the second metal react to form a wick structure made of an intermetallic compound. Is formed.

In the sixth embodiment of the present invention, the core rod is made of a heating element, and in the step of heating the metal powder at a temperature lower than the melting point of the first metal, the core rod is preferably heated.
By heating the core rod, the portion of the metal powder in contact with the core rod can be made into an intermetallic compound, which makes it easy to pull out the core rod from the container.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the heat pipe which does not need to pull out a core rod from a container, or the manufacturing method of the heat pipe which can pull out a core rod from a container easily can be provided.

FIG. 1 is a cross-sectional view schematically showing an example of a heat pipe manufactured by the heat pipe manufacturing method of the present invention. FIG. 2 is a cross-sectional view schematically showing another example of a heat pipe manufactured by the heat pipe manufacturing method of the present invention. FIG. 3 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the first embodiment of the present invention. FIG. 4 is a perspective view schematically showing another example of the heat pipe manufacturing method according to the first embodiment of the present invention. 5 (a), FIG. 5 (b), FIG. 5 (c), FIG. 5 (d), FIG. 5 (e) and FIG. 5 (f) show the manufacture of the heat pipe according to the first embodiment of the present invention. It is sectional drawing which shows typically another example of the heat pipe obtained by the method. 6 (a), 6 (b), and 6 (c) are cross-sectional views schematically showing an example of a method for manufacturing a heat pipe in which both side surfaces or one side surface of a container is flat. 7 (a), FIG. 7 (b), FIG. 7 (c1), FIG. 7 (c2), FIG. 7 (d1), and FIG. 7 (d2) are heat pipes having flat side surfaces or one side surface. It is sectional drawing which shows typically another example of this manufacturing method. 8 (a), 8 (b), 8 (c), and 8 (d) are cross-sectional views schematically showing still another example of a method for manufacturing a heat pipe in which one side surface of the container is flat. It is. FIGS. 9A and 9B are cross-sectional views schematically showing still another example of the heat pipe obtained by the heat pipe manufacturing method according to the first embodiment of the present invention. FIG. 10 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the second embodiment of the present invention. FIG. 11 is a perspective view schematically showing an example of a step of inserting a metal rod and metal powder. FIG. 12 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the third embodiment of the present invention. FIG. 13: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 4th Embodiment of this invention. FIG. 14 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the fifth embodiment of the present invention. FIG. 15: is a perspective view which shows typically another example of the manufacturing method of the heat pipe which concerns on 5th Embodiment of this invention. FIG. 16: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 6th Embodiment of this invention.

Hereinafter, the manufacturing method of the heat pipe of this invention is demonstrated.
However, the present invention is not limited to the following configurations, and can be applied with appropriate modifications without departing from the scope of the present invention. Note that the present invention also includes a combination of two or more desirable configurations of the present invention described below.

FIG. 1 is a cross-sectional view schematically showing an example of a heat pipe manufactured by the heat pipe manufacturing method of the present invention.
A heat pipe 1 shown in FIG. 1 includes a container 10 and a wick structure 11. The wick structure 11 is fixed to the central portion of the container 10, and a gap 12 is formed between the inner wall of the container 10 and the wick structure 11 at both ends of the container 10. In FIG. 1, the container 10 has a flat tube shape, but the cross-sectional shape of the container 10 is not particularly limited. Although not shown in FIG. 1, a non-condensable gas such as air is degassed in the container 10, and a working fluid is sealed therein.

FIG. 2 is a cross-sectional view schematically showing another example of a heat pipe manufactured by the heat pipe manufacturing method of the present invention.
The heat pipe 2 shown in FIG. 2 includes a container 20 and a wick structure 21. The wick structure 21 is fixed to the inner wall of the container 20, and a gap 22 is formed in the central portion of the container 20. In FIG. 2, the container 20 has a tube shape with a substantially circular cross section, but the cross sectional shape of the container 20 is not particularly limited, and may have a flat tube shape. Although not shown in FIG. 2, non-condensable gas such as air is degassed in the container 20, and the working fluid is sealed therein.

As a method of manufacturing the heat pipe, a method of manufacturing the heat pipe according to the first to sixth embodiments of the present invention will be described.
The heat pipe 1 shown in FIG. 1 can be manufactured by the method according to the first embodiment of the present invention, and the heat pipe 2 shown in FIG. 2 is a method according to the second to sixth embodiments of the present invention. Can be manufactured by.

Each embodiment shown below is an illustration, and it cannot be overemphasized that a partial substitution or combination of composition shown in a different embodiment is possible. In the second and subsequent embodiments, description of matters common to the first embodiment will be omitted, and only different points will be described. In particular, the same operational effects by the same configuration will not be sequentially described for each embodiment.

(First embodiment)
FIG. 3 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the first embodiment of the present invention.

First, as shown to 1A of FIG. 3, the rod-shaped wick structure 11 which consists of an intermetallic compound of a 1st metal and a 2nd metal is prepared.

The wick structure is preferably produced by heating a metal powder containing a first metal and a second metal. For example, a wick structure made of an intermetallic compound of a first metal and a second metal can be produced by filling the metal powder in a firing jig made of a heat-resistant ceramic such as alumina and heating. . By adjusting the shape or particle size of the metal powder, the porosity of the wick structure can be adjusted.

The wick structure can be produced by immersing a mesh made of a second metal into a rod shape, immersing it in the molten first metal, and heating it, or a porous rod made of the second metal. Can be produced by immersing in a molten first metal and heating it. In the above method, the degree of porosity of the obtained sintered body can be adjusted, for example, pores having different sizes can be provided, compared to a method of heating metal powder containing the first metal and the second metal. Therefore, the performance of the heat pipe can be adjusted arbitrarily. Specifically, in the method of heating the metal powder containing the first metal and the second metal, pores are formed by the alloying reaction between the first metal and the second metal, whereas in the above method, In addition to the formation of pores by the alloying reaction, the pores that are present from the beginning can be left in the mesh or porous rod made of the second metal. Therefore, if the size of the pores originally present in the mesh or porous rod made of the second metal is large, the first metal does not get wet at the center of the pores, so that the large pores remain as cavities, and further the alloying reaction As a result, small pores are newly formed. In addition, the ratio of the pores of different sizes can be adjusted depending on the temperature of the first metal to be melted, the immersion time, and the degree of porosity of the mesh or porous rod made of the second metal.

The heating temperature is preferably 250 ° C. or higher and 350 ° C. or lower. The heating time is preferably 10 minutes or longer, more preferably 180 minutes or shorter, and more preferably 60 minutes or shorter.

The first metal is Sn or Sn alloy, for example, Sn alone, Cu, Ni, Ag, Au, Sb, Zn, Bi, In, Ge, Al, Co, Mn, Fe, Cr, Mg, Mn An alloy containing Sn and at least one selected from the group consisting of Pd, Si, Sr, Te, and P is given. Among them, Sn, Sn-3Ag-0.5Cu, Sn-3.5Ag, Sn-0.75Cu, Sn-58Bi, Sn-0.7Cu-0.05Ni, Sn-5Sb, Sn-2Ag-0.5Cu- 2Bi, Sn-57Bi-1Ag, Sn-3.5Ag-0.5Bi-8In, Sn-9Zn, or Sn-8Zn-3Bi is preferable.
In the above notation, for example, “Sn-3Ag-0.5Cu” indicates an alloy containing 3% by weight of Ag, 0.5% by weight of Cu, and the balance being Sn.

The second metal is a Cu alloy, and examples thereof include a Cu—Ni alloy, a Cu—Mn alloy, a Cu—Al alloy, and a Cu—Cr alloy. Among these, a Cu—Ni alloy or a Cu—Mn alloy is preferable.
The Cu—Ni alloy is preferably a Cu—Ni alloy with a Ni content of 5 wt% or more and 30 wt% or less, for example, Cu-5Ni, Cu-10Ni, Cu-15Ni, Cu-20Ni, Cu-25Ni, or Cu-30Ni. The Cu—Ni alloy includes alloys containing a third component such as a Cu—Ni—Co alloy and a Cu—Ni—Fe alloy.
The Cu—Mn alloy is preferably a Cu—Mn alloy having a Mn ratio of 5 wt% or more and 30 wt% or less, such as Cu-5Mn, Cu-10Mn, Cu-15Mn, Cu-20Mn, Cu-25Mn, or Cu-30Mn.
The Cu—Al alloy is preferably a Cu—Al alloy having an Al ratio of 5% by weight or more and 10% by weight or less, and examples thereof include Cu-5Al and Cu-10Al.
The Cu—Cr alloy is preferably a Cu—Cr alloy having a Cr ratio of 5 wt% or more and 10 wt% or less, and examples thereof include Cu-5Cr and Cu-10Cr.
The second metal may contain Mn and Ni at the same time, such as Cu—Mn—Ni, or may contain a third component such as P.
In the above notation, for example, “Cu-5Ni” indicates an alloy containing 5% by weight of Ni and the balance being Cu. The same applies to Mn, Al or Cr.

When the metal powder containing the first metal and the second metal is heated so that the temperature reaches or exceeds the melting point of the first metal (for example, Sn), the first metal is melted. When the heating is further continued, the first metal and the second metal (for example, Cu—Ni alloy) react to generate an intermetallic compound (for example, (Cu, Ni) ₆ Sn ₅ ). As the intermetallic compound is generated, voids (pores) are formed in the intermetallic compound, so that the intermetallic compound is porous. From the viewpoint of making the intermetallic compound porous, it is preferable to react both in a state where the first metal and the second metal are not pressurized.

The intermetallic compound in the wick structure can be easily confirmed by observing the cross section of the wick structure using a metal microscope. Specifically, intermetallic compounds such as (Cu, Ni) ₆ Sn ₅ are confirmed by performing composition analysis by energy dispersive X-ray analysis (EDX) and the like and crystal structure analysis by microscopic X-ray diffraction and the like. can do.

The shape of the wick structure is not particularly limited as long as it is rod-shaped, but is preferably cylindrical. The shape of the wick structure may be a truncated cone shape. Further, the length of the wick structure is not particularly limited.

Next, as shown to 1B of FIG. 3, the wick structure 11 is inserted in tubular container 10 '. In FIG. 3B, one wick structure 11 is inserted, but two or more wick structures may be inserted.

The container is preferably made of a material having high thermal conductivity because heat needs to be transferred inside and outside. As a material for the container, for example, a metal such as copper or aluminum can be used. In addition, since heat pipes need to have heat resistance and mechanical strength that can withstand internal vapor pressure and external force, for example, stainless steel, copper alloy, carbon steel, etc. may be used as the container material. it can. The shape of the container is not particularly limited, and may be a cylinder other than a cylinder. Further, the shape of the inner wall of the container is not particularly limited, and a capillary structure such as a groove may be provided on the inner wall.

Subsequently, the container is deformed. Thereby, as shown to 1C of FIG. 3, the wick structure 11 is fixed in the container 10 in the state which left the space | gap 12 between the inner wall of the container 10, and the wick structure 11. FIG.

Examples of the method for deforming the container include rolling methods such as hot rolling and cold rolling, and processing methods such as bending. Since the intermetallic compound constituting the wick structure is a brittle member, the above processing is preferably performed within a range in which the container can be deformed. By deforming the container, the wick structure can be brought into contact with the inner wall of the container, and the wick structure is fixed in the container by an anchor effect.

As described above, since the intermetallic compound constituting the wick structure is porous, the working fluid can be moved by capillary action. On the other hand, the gap between the container inner wall and the wick structure functions as a steam flow path.

Thereafter, if necessary, non-condensable gas such as air existing inside the container is degassed, and the working liquid is sealed in the container. As the hydraulic fluid, water, ethanol, methanol, naphthalene, benzene, alternative chlorofluorocarbon, ammonia or the like can be used. In addition, for degassing non-condensable gas, a vacuum degassing method or a method of injecting an excess amount of hydraulic fluid in advance and driving out the non-condensable gas by boiling the hydraulic fluid by heating the container Etc. are used.

As described above, the heat pipe 1 shown in FIG. 1 can be manufactured.

FIG. 4 is a perspective view schematically showing another example of the heat pipe manufacturing method according to the first embodiment of the present invention.
In 1A of FIG. 4, unlike 1A of FIG. 3, two rod-like wick structures 11 are prepared. As shown to 1B of FIG. 4, after inserting the two wick structures 11 in the tubular container 10 ', the container 10' is deformed. Thereby, as shown to 1C of FIG. 4, the two wick structures 11 are fixed in the container 10 in the state which left the space | gap 12 between the inner wall of the container 10, and the two wick structures 11. FIG. . Thus, two or more wick structures may be inserted into the container.

5 (a), FIG. 5 (b), FIG. 5 (c), FIG. 5 (d), FIG. 5 (e) and FIG. It is sectional drawing which shows typically another example of the heat pipe obtained by the method.
Both side surfaces of the container 10 may be flat like a heat pipe 1a shown in FIG. 5 (a), a heat pipe 1b shown in FIG. 5 (b), and a heat pipe 1c shown in FIG. 5 (c). The side surface of the container 10 is flat like the heat pipe 1d shown in FIG. 5 (d), the heat pipe 1e shown in FIG. 5 (e), and the heat pipe 1f shown in FIG. 5 (f). Also good. By flattening the both side surfaces or one side surface of the container, the heat pipe can be mounted in a denser space, so that the storage efficiency can be improved. And the improvement of the heat conveyance efficiency of a heat pipe mounting part can be anticipated by raising storage efficiency.

A heat pipe in which both side surfaces or one side surfaces of the container are flat can be manufactured, for example, by the method described below. In addition, in the method shown below, a container can be made into arbitrary shapes, such as not only the shape where the both sides | surfaces or one side surface of a container is flat, but the shape where parts other than a side are also flat.

6 (a), 6 (b), and 6 (c) are cross-sectional views schematically showing an example of a method for manufacturing a heat pipe in which both side surfaces or one side surface of a container is flat.
As shown in FIG. 6A, after the wick structure 11 is inserted into the tubular container 10 ′, the container 10 ′ is pressed as shown in FIG. 6B. Thereby, as shown in FIG.6 (c), the shape of the heat pipe 1a shown to Fig.5 (a) is obtained, for example.

7 (a), FIG. 7 (b), FIG. 7 (c1), FIG. 7 (c2), FIG. 7 (d1), and FIG. 7 (d2) are heat pipes having flat side surfaces or one side surface. It is sectional drawing which shows typically another example of this manufacturing method.
As shown in FIGS. 7A and 7B, a plate-like (including foil-like) container 10 ″ is molded. Here, as shown in FIG. 7C1, after the wick structure 11 is inserted so as to be accommodated in the two molded containers 10 ″, the end of the container 10 ″ is welded or the like. As shown in FIG. 7 (d1), for example, the shape of the heat pipe 1a shown in FIG. 5 (a) is obtained. Further, as shown in FIG. 7C2, after the wick structure 11 is inserted so as to be accommodated in the molded container 10 ″ and the unmolded container 10 ″, the container 10 is welded or the like. By sealing the end portion of ″, for example, the shape of the heat pipe 1b shown in FIG. 5B is obtained as shown in FIG. 7D2.

8 (a), 8 (b), 8 (c), and 8 (d) are cross-sectional views schematically showing still another example of a method for manufacturing a heat pipe in which one side surface of the container is flat. It is.
As shown in FIGS. 8A and 8B, a plate-like (including foil-like) container 10 ″ is molded. As shown in FIG. 8C, after the wick structure 11 is inserted so as to be accommodated in one molded container 10 ″, the end of the container 10 ″ is sealed by welding or the like. By doing so, as shown in FIG. 8D, for example, the shape of the heat pipe 1d shown in FIG. 5D is obtained.

In a heat pipe in which both sides or one side of the container is flat, as a method of enclosing the working fluid in the container, for example, a method of impregnating the wick structure in advance before inserting the wick structure, three ways Examples include a method of injecting a working fluid from an unsealed port after sealing and finally sealing all sides.

FIGS. 9A and 9B are cross-sectional views schematically showing still another example of the heat pipe obtained by the heat pipe manufacturing method according to the first embodiment of the present invention.
In the heat pipe 1g shown in FIG. 9A, the cross-sectional shape of the wick structure 11a is semicircular, and in the heat pipe 1h shown in FIG. 9B, the cross-sectional shape of the wick structure 11b is rectangular. 9 (a) and 9 (b), the shape of the container 10 is the same as in FIG. 1, but FIGS. 5 (a), 5 (b), 5 (c), 5 (d), It may be the same as FIG. 5 (e), FIG. 5 (f) and the like.

Thus, the shape of the wick structure is not limited to a columnar shape or a truncated cone shape, and may be a semi-columnar shape, a rectangular column shape (preferably a rectangular parallelepiped shape), a hexagonal column shape, or the like. Also good. In particular, a wick structure having a shape such as a semi-cylindrical shape or a prism shape is suitably used for a thin heat pipe.

The wick structure having a predetermined shape is arranged, for example, by placing the metal powder so as to have a desired shape when filling a firing jig with metal powder containing a first metal and a second metal. Can be produced by heating. When the wick structure has a curved surface, such as a columnar shape or a semi-cylindrical shape, the contact area with the firing jig can be reduced, so that the wick structure can be easily taken out from the firing jig. is there. In addition, when the wick structure has a flat surface, such as a prismatic shape, when the wick structure is inserted into the container, the wick structure can be transported while holding the flat surface such as the side surface. Then, there is an advantage that it can be conveyed.

As described above, in the first embodiment, a heat pipe having an arbitrary shape can be manufactured by preparing a wick structure having a predetermined shape in advance and deforming the container into the predetermined shape.

(Second Embodiment)
FIG. 10 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the second embodiment of the present invention.

First, as shown in 2A of FIG. 10, a metal rod 23 made of a first metal is prepared.

A 1st metal is Sn or Sn alloy, and what was demonstrated in 1st Embodiment is mentioned.

The shape of the metal rod is preferably a hollow tube as shown in 2A of FIG. In this case, what rolled the foil (for example, Sn foil) which consists of 1st metals is also contained, and two or more layers may overlap. When the metal rod is a hollow tube, at least one end face may be sealed. Further, the length of the metal rod is not particularly limited.

Next, as shown in 2B of FIG. 10, the metal rod 23 and the metal powder 24 are inserted into the tubular container 20. At this time, the metal rod 23 and the metal powder 24 are inserted into the container 20 so that the space between the inner wall of the container 20 and the metal rod 23 is filled with the metal powder 24. When the metal rod 23 is a hollow tube, it is preferable to fill the metal powder 24 so that the metal powder 24 does not enter the hollow portion.

The material, shape, and the like of the container 20 are the same as those of the container 10 ′ described in the first embodiment.

The metal powder includes a second metal. The second metal is a Cu alloy, and those described in the first embodiment can be mentioned. The content of the second metal in the metal powder is preferably 60% by weight or more, more preferably 80% by weight or more, and particularly preferably 100% by weight.

FIG. 11 is a perspective view schematically showing an example of a step of inserting a metal rod and metal powder.
In 2B-1 of FIG. 11, after inserting the metal rod 23 into the container 20, the space between the inner wall of the container 20 and the metal rod 23 is filled with the metal powder 24. When the metal rod 23 is a hollow tube, it is preferable that at least the end surface on the side where the metal powder is inserted is sealed so that the metal powder 24 does not enter the hollow portion.
In 2B-2 of FIG. 11, after filling the container 20 with the metal powder 24, the metal rod 23 is inserted into the container 20 so as to push out the metal powder 24 in the container 20. When the metal rod 23 is a hollow tube, at least the end surface on the side where the metal rod is inserted (the end surface on the left side in FIG. 11) is sealed so that the metal powder 24 does not enter the hollow portion. Preferably it is.
In 2B-3 of FIG. 11, after the metal powder 24 is attached around the metal rod 23, the metal rod 23 to which the metal powder 24 is attached is inserted into the container 20. When the metal rod 23 is a hollow tube, at least one end surface may be sealed. As a method of attaching metal powder around the metal rod, a method of applying a paste containing metal powder around the metal rod, a method of plating metal particles on the metal rod, a method of spraying metal powder onto the metal rod, etc. Is mentioned.
In addition, when using a metal bar to which metal powder adheres as shown in 2B-3 in FIG. 11, after inserting the metal bar into the container, the metal powder may be further filled, or the metal powder may be filled. The metal bar may be inserted into the sealed container.

Subsequently, the metal rod and metal powder inserted into the container are heated. As a result, the first metal constituting the metal rod reacts with the second metal contained in the metal powder to produce an intermetallic compound, and the metal rod disappears. As a result, as shown in 2C of FIG. 10, a wick structure 21 made of an intermetallic compound is formed, and a void 22 is formed in the container 20. When the molten intermetallic compound is solidified, the wick structure made of the intermetallic compound is fixed in the container.

The heating temperature is preferably a temperature equal to or higher than the melting point of the first metal, and specifically, 250 ° C. or higher and 350 ° C. or lower is preferable. The heating time is preferably 10 minutes or longer, more preferably 180 minutes or shorter, and more preferably 60 minutes or shorter.

The reaction between the first metal and the second metal is as described in the first embodiment. As described above, since the intermetallic compound constituting the wick structure is porous, the working fluid can be moved by capillary action. On the other hand, the void in the container functions as a steam flow path.

Thereafter, as in the first embodiment, if necessary, non-condensable gas such as air existing inside the container is degassed, and the working fluid is sealed in the container. The container may be flattened or bent before the working fluid is sealed in the container or after the working fluid is sealed in the container.

As described above, the heat pipe 2 shown in FIG. 2 can be manufactured.

(Third embodiment)
FIG. 12 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the third embodiment of the present invention.

First, as shown to 3A of FIG. 12, the mesh sheet 35 containing a 1st metal and a 2nd metal is prepared.

A 1st metal is Sn or Sn alloy, and what was demonstrated in 1st Embodiment is mentioned. The second metal is a Cu alloy, and those described in the first embodiment can be mentioned.

Examples of the mesh shape of the mesh sheet include a woven mesh shape, a knitted mesh shape, and a mesh shape in which fine holes are punched at a predetermined interval.

The mesh sheet is preferably produced by plating the first metal on a mesh made of the second metal.

Moreover, it is preferable to produce the said mesh sheet | seat by making the metal powder containing a 1st metal adhere to the mesh which consists of a 2nd metal. In this case, metal powder may be attached to at least one main surface of the mesh.

The metal powder attached to the mesh preferably contains a second metal in addition to the first metal. The second metal contained in the metal powder may be different from the second metal constituting the mesh, but is preferably the same as the second metal constituting the mesh.

The content of the first metal in the metal powder is preferably 40% by weight or more and 80% by weight or less. Further, the content of the second metal in the metal powder is preferably 20% by weight or more and 60% by weight or less.

The metal powder can be attached to the mesh by filling the mesh with metal powder, applying a paste containing the metal powder to the mesh, plating the metal particles onto the mesh, and spraying the metal powder onto the mesh. And the like.

From the viewpoint of increasing the porosity of the wick structure, the particle size of the metal powder attached to the mesh is preferably larger than the mesh size of the mesh. When the particle size of the metal powder is the same as or smaller than the mesh mesh size, the mesh mesh is filled with the metal powder, and the wick structure formed after the reaction may become dense.

Next, as shown in 3B of FIG. 12, the mesh sheet 35 is inserted into the tubular container 20. At this time, the core sheet is not used, the mesh sheet 35 is rolled, and the mesh sheet 35 is inserted into the container 20 along the inner wall of the container 20. In FIG. 12B, one mesh sheet 35 is inserted, but two or more mesh sheets may be inserted. Moreover, the mesh sheet inserted into the container may overlap two or more layers.

When using a mesh sheet in which metal powder is attached to only one main surface of the mesh, it is preferable to roll the metal sheet so that the main surface to which the metal powder is attached is inside and insert it into the container.

Subsequently, the mesh sheet inserted into the container is heated. Thereby, the 1st metal and 2nd metal which comprise a mesh sheet react, and an intermetallic compound produces | generates. As a result, as shown in 3C of FIG. 12, a wick structure 21 made of an intermetallic compound is formed. In addition, a gap 22 is formed in the container 20. When the molten intermetallic compound is solidified, the wick structure made of the intermetallic compound is fixed in the container. A part of the mesh sheet may remain without reacting.

Thereafter, as in the first embodiment, if necessary, non-condensable gas such as air existing inside the container is degassed, and the working fluid is sealed in the container. The container may be flattened or bent before the working fluid is sealed in the container or after the working fluid is sealed in the container. Moreover, after inserting a mesh sheet in a container, you may give the said process before heating a mesh sheet.

As described above, the heat pipe 2 shown in FIG. 2 can be manufactured.

(Fourth embodiment)
FIG. 13: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 4th Embodiment of this invention.

First, as shown in 4A of FIG. 13, a core rod 46 with a mesh in which a mesh 45 made of a second metal is wound around the core rod 43 is prepared. In 4A of FIG. 13, one mesh sheet 45 is wound, but two or more mesh sheets may be wound. Moreover, the mesh sheet wound around the core rod may overlap two or more layers.

The second metal is a Cu alloy, and those described in the first embodiment can be mentioned. Moreover, what was demonstrated in 3rd Embodiment is mentioned as a mesh shape of a mesh sheet.

The core rod material has a melting point higher than the temperature at which the first metal and the second metal react to produce an intermetallic compound, and the first metal and the second metal at the temperature at which the intermetallic compound is produced. Those that do not react with metals are preferred. As a material for the core rod, for example, stainless steel, alumina or the like can be used.

The shape of the core rod is not particularly limited, but is preferably a cylindrical shape. The core rod may have a cutout portion along the long axis direction, or may have a shape that can be divided. Further, the shape of the core rod may be a truncated cone shape. The length of the core rod is not particularly limited, but is preferably the same as the container length or longer than the container.

Next, as shown in 4B of FIG. 13, the meshed core rod 46 and the metal powder 44 are inserted into the tubular container 20. At this time, the mesh core rod 46 and the metal powder 44 are inserted into the container 20 so that the space between the inner wall of the container 20 and the mesh core rod 46 is filled with the metal powder 44.

The metal powder includes a first metal and a second metal. A 1st metal is Sn or Sn alloy, and what was demonstrated in 1st Embodiment is mentioned. The second metal contained in the metal powder may be different from the second metal constituting the mesh, but is preferably the same as the second metal constituting the mesh.

The content of the first metal in the metal powder is preferably 20% by weight or more and 60% by weight or less. The content of the second metal in the metal powder is preferably 40% by weight or more and 80% by weight or less.

As a method of inserting the core rod with mesh and metal powder into the container, the same method as in the second embodiment, that is, after inserting the core rod with mesh into the container, the inner wall of the container and the core rod with mesh is inserted. Method of filling the space between the metal powder, filling the container with metal powder, then inserting the core rod with mesh into the container to extrude the metal powder in the container, metal to the mesh of the core rod with mesh Examples include a method of inserting a core rod with a mesh to which a metal powder is adhered into a container after the powder is adhered. When using a core rod with a mesh to which metal powder is attached, after inserting the core rod with a mesh into the container, the metal powder may be further filled, or the container with the mesh is filled with the metal powder. A core rod may be inserted.

Subsequently, the core rod with mesh and metal powder inserted in the container are heated. As a result, the first metal and the second metal contained in the metal powder react with each other, and the first metal contained in the metal powder reacts with the second metal constituting the meshed core rod to form an intermetallic compound. To do. As a result, as shown in 4C of FIG. 13, a wick structure 21 made of an intermetallic compound is formed. When the molten intermetallic compound is solidified, the wick structure made of the intermetallic compound is fixed in the container. Since the mesh made of the second metal is wound around the core rod, when the first metal and the second metal react between the inner wall of the container and the core rod, the molten first metal is applied to the core rod. It becomes difficult to contact, and adhesion with a core stick and an intermetallic compound is prevented. Note that a part of the mesh wound around the core rod may remain without reacting. In particular, from the viewpoint of preventing sticking between the core rod and the intermetallic compound, it is preferable that the mesh in the portion in contact with the core rod remains without reacting.

The reaction between the first metal and the second metal is as described in the first embodiment. As described above, since the intermetallic compound constituting the wick structure is porous, the working fluid can be moved by capillary action.

Then, as shown in 4D of FIG. 13, the core rod 43 is pulled out from the container 20. As a result, a gap 22 is formed in the container 20. The void in the container functions as a steam flow path. As described above, since the mesh wound around the core rod reacts with the first metal to form an intermetallic compound, it is fixed to the container. As a result, only the core rod can be pulled out from the container.

As described above, the heat pipe 2 shown in FIG. 2 can be manufactured.

(Fifth embodiment)
FIG. 14 is a perspective view schematically showing an example of a heat pipe manufacturing method according to the fifth embodiment of the present invention.

First, as shown to 5A of FIG. 14, the core rod 53 which consists of resin is prepared. 14A shows a core rod 53 made entirely of resin, it may be a core rod made of resin at least on the surface. Further, in FIG. 14A, a cylindrical core rod is shown, but the core rod may be a round bar having a taper at least at one end. Furthermore, in FIG. 14A, a round bar-shaped core rod is shown, but a hollow round bar-shaped core rod may be used.

The resin has a melting point higher than the temperature at which the first metal and the second metal react to form an intermetallic compound, and has a thermal expansion coefficient larger than the thermal expansion coefficient of the intermetallic compound. Here, the melting point of the resin means a value measured according to differential scanning calorimetry (DSC) in JIS K7121. Furthermore, it is preferable that the resin does not react with the first metal and the second metal at a temperature at which the intermetallic compound is generated.

Examples of the resin material include silicone resin, polybenzimidazole resin (PBI), polyether ether ketone resin (PEEK), polyimide resin (PI), polyamideimide resin (PAI), and polytetrafluoroethylene resin (PTFE). And perfluoroalkoxy resin (PFA). In these, a silicone resin is preferable.

When the core rod includes a material other than resin, examples of the material other than resin include those described in the fourth embodiment. Moreover, the shape, length, etc. of a core rod are the same as the core rod demonstrated in 4th Embodiment.

Next, as shown in 5B of FIG. 14, the core rod 53 and the metal powder 54 are inserted into the tubular container 20. At this time, the core rod 53 and the metal powder 54 are inserted into the container 20 so that the space between the inner wall of the container 20 and the core rod 53 is filled with the metal powder 54.

The metal powder includes a first metal and a second metal. A 1st metal is Sn or Sn alloy, and what was demonstrated in 1st Embodiment is mentioned. The second metal is a Cu alloy, and those described in the first embodiment can be mentioned.

The content of the first metal in the metal powder is preferably 20% by weight or more and 40% by weight or less. Further, the content of the second metal in the metal powder is preferably 60% by weight or more and 80% by weight or less.

As a method of inserting the core rod and the metal powder into the container, the same method as in the second embodiment, that is, after inserting the core rod into the container, the metal powder is inserted into the space between the inner wall of the container and the core rod. After filling the container with metal powder, after inserting the core rod into the container to extrude the metal powder in the container, after attaching the metal powder around the core rod, the metal powder is For example, a method of inserting the attached core rod into the container may be used. When using a core rod to which metal powder is attached, after inserting the core rod into the container, the metal powder may be further filled, or the core rod is inserted into the container filled with metal powder. Also good.

Subsequently, the core rod and metal powder inserted into the container are heated. Thereby, the 1st metal and 2nd metal which are contained in metal powder react, and an intermetallic compound produces | generates. As shown in 5C of FIG. 14, since the resin constituting the core rod 53 expands during heating, the wick structure 21 made of an intermetallic compound is formed while being pressed against the expanded resin. On the other hand, since the resin shrinks during cooling after heating, a gap 52 is generated between the wick structure 21 and the core bar 53. When the molten intermetallic compound is solidified, the wick structure made of the intermetallic compound is fixed in the container.

The heating temperature is preferably a temperature equal to or higher than the melting point of the first metal, and specifically, 250 ° C. or higher and 300 ° C. or lower is preferable. The heating time is preferably 10 minutes or longer, more preferably 180 minutes or shorter, and more preferably 60 minutes or shorter.

Then, as shown in FIG. 14D, the core rod 53 is pulled out from the container 20. As a result, a gap 22 is formed in the container 20. The void in the container functions as a steam flow path. As described above, since a gap is generated between the wick structure and the core rod, the core rod can be easily pulled out from the container.

As described above, the heat pipe 2 shown in FIG. 2 can be manufactured.

FIG. 15: is a perspective view which shows typically another example of the manufacturing method of the heat pipe which concerns on 5th Embodiment of this invention.
In FIG. 15, unlike the cylindrical core rod 53 shown in FIG. 14, a truncated cone-shaped core rod 53 ′ having a tapered tip is prepared. Thus, it is preferable that at least one tip of the core rod is tapered. From the viewpoint of ease of pulling out the core rod, it is preferable to insert the tapered portion of the core rod 53 ′ into the container 20 as shown in FIG. 15.

(Sixth embodiment)
FIG. 16: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 6th Embodiment of this invention.

First, as shown to 6A of FIG. 16, the core bar 63 and the metal powder 64 are inserted in the tubular container 20. As shown in FIG. At this time, the core rod 63 and the metal powder 64 are inserted into the container 20 so that the space between the inner wall of the container 20 and the core rod 63 is filled with the metal powder 64.

Examples of the material for the core rod include those described in the fourth embodiment. As will be described later, when the core rod generates heat, the core rod is preferably made of a heating element. Specifically, a ceramic tube with a built-in heat wire is preferably used as the core rod, and an alumina tube with a built-in nichrome wire is more preferably used as the core rod. Moreover, the shape, length, etc. of a core rod are the same as the core rod demonstrated in 4th Embodiment.

Next, the metal powder in the container in which the core rod is inserted is heated at a temperature lower than the melting point of the first metal. Thereby, as shown in 6B of FIG. 16, a part of the first metal and a part of the second metal contained in the metal powder 64 react, and a part of the metal powder 64 becomes the intermetallic compound 61. As a result, the shape of the metal powder 64 is maintained, and the metal powder 64 is fixed in the container 20.

In the step of heating the metal powder at a temperature lower than the melting point of the first metal, the entire container may be heated, but it is preferable to heat the metal powder by heating the core rod. By causing the core rod to generate heat, the metal powder at the portion in contact with the core rod can be made into an intermetallic compound.

The heating temperature is not particularly limited as long as it is lower than the melting point of the first metal, but is preferably 170 ° C. or higher and 230 ° C. or lower, and more preferably 200 ° C. or higher and 230 ° C. or lower. The heating time is preferably 15 minutes or more and 180 minutes or less.

Subsequently, the core rod 63 is pulled out from the container 20 as shown in 6C of FIG. As a result, a gap 22 is formed in the container 20. As described above, since the shape of the metal powder is maintained and the metal powder is fixed in the container, the core rod can be pulled out from the container.

Then, the metal powder in the container in which the core bar is pulled out is heated at a temperature equal to or higher than the melting point of the first metal. Thereby, the unreacted first metal and the second metal contained in the metal powder react to generate an intermetallic compound. As a result, as shown in FIG. 16D, a wick structure 21 made of an intermetallic compound is formed. When the molten intermetallic compound is solidified, the wick structure made of the intermetallic compound is fixed in the container.

In the step of heating the metal powder at a temperature equal to or higher than the melting point of the first metal, it is preferable to heat the entire container.

The heating temperature is not particularly limited as long as it is a temperature equal to or higher than the melting point of the first metal, but is preferably 250 ° C or higher and 350 ° C or lower. The heating time is preferably 10 minutes or longer, more preferably 180 minutes or shorter, and more preferably 60 minutes or shorter.

As described above, the heat pipe 2 shown in FIG. 2 can be manufactured.

As described above, the configurations shown in the different embodiments can be partially replaced or combined. For example, the core rod described in the fifth embodiment may be used in the fourth embodiment and the sixth embodiment, or the method described in the sixth embodiment is combined with the fourth embodiment and the fifth embodiment. Also good.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 2

Heat pipe

10, 10 ', 10 ", 20

Container

11, 11a, 11b, 21

Wick structure

12, 22 Air gap 23

Metal rod

24 , 44, 54, 64 Metal powder 35

Mesh sheet

43, 53, 53 ′, 63 Core rod 45 Mesh 46 Mesh core rod 52 Gap 61 Intermetallic compound

Claims

Preparing a rod-like wick structure composed of an intermetallic compound of Sn or Sn alloy as the first metal and Cu alloy as the second metal;
Inserting the wick structure into a tubular container;
Fixing the wick structure in the container with a space left between the inner wall of the container and the wick structure by deforming the container;
A method of manufacturing a heat pipe, comprising:
2. The method of manufacturing a heat pipe according to claim 1, wherein in the step of preparing the wick structure, the wick structure is manufactured by heating a metal powder containing the first metal and the second metal.
The method for manufacturing a heat pipe according to claim 1 or 2, wherein two or more wick structures are inserted into the container.
At least the surface is made of a resin, and the resin has a melting point higher than a temperature at which an Sn or Sn alloy as a first metal reacts with a Cu alloy as a second metal to produce an intermetallic compound, and Preparing a core rod having a thermal expansion coefficient larger than that of the intermetallic compound;
The core rod and the metal powder are inserted into the container so that the space between the inner wall of the tubular container and the core rod is filled with the metal powder containing the first metal and the second metal. And a process of
A wick structure made of an intermetallic compound is produced by reacting the first metal and the second metal contained in the metal powder by heating the core rod and the metal powder inserted into the container. Forming, and
Extracting the core rod from the container;
A method of manufacturing a heat pipe, comprising:
The heat pipe manufacturing method according to claim 4, wherein at least one tip of the core rod is tapered.
The method for manufacturing a heat pipe according to claim 4, wherein the resin is a silicone resin.
In the step of inserting the core rod and the metal powder, after inserting the core rod into the container, the space between the inner wall of the container and the core rod is filled with the metal powder. The manufacturing method of the heat pipe of any one of these.
The step of inserting the core rod and the metal powder inserts the core rod into the container so as to extrude the metal powder in the container after filling the metal powder into the container. The method for manufacturing a heat pipe according to any one of 6.
7. The step of inserting the core rod and the metal powder includes inserting the metal powder around the core rod and then inserting the core rod attached with the metal powder into the container. A manufacturing method of a heat pipe given in any 1 paragraph.