JP6721045B2 - Heat pipe manufacturing method - Google Patents

Description

The present invention relates to a heat pipe manufacturing method.

The heat pipe is used for cooling a CPU mounted in electronic equipment such as a personal computer. A heat pipe is a sealed metal body that degasses a non-condensable fluid and encloses an appropriate amount of hydraulic fluid. The working liquid sealed inside the container evaporates by being heated from the outside of the container in the evaporating unit, and the steam is cooled in the condensing unit to be condensed and returned to the working liquid to transport the heat as latent heat. Since heat is transported as latent heat, it is possible to transport heat even with a small temperature difference between the evaporation section and the condensation section.

In the container, it is necessary to recirculate the working liquid condensed in the condenser to the evaporator. When the evaporation part is located above the condensation part or when the evaporation part and the condensation part are located horizontally, the surface tension of the working liquid is used to recirculate the working liquid. Therefore, a wick structure is required inside the container.

For the wick structure, a linear body formed by bundling a number of fine wires, a mesh body such as a mesh, or a sintered body obtained by sintering a metal powder such as copper powder is used. It is known that those using a sintered body of metal powder can obtain high surface tension.

For example, in Patent Document 1, a core rod having a cutout portion is inserted into a container, a space formed by the cutout portion of the core rod and an inner wall of the container is filled with metal powder, and the metal powder and the core rod are included. There is disclosed a method for producing a heat pipe in which a container is heated in a state where the container is inserted, a core rod is pulled out from 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, by heating the container in a state where the metal powder and the core rod are inserted, the metal powder is sintered to form a sintered metal, and the sintered metal is fixed to the container. be able to. However, when the sintered metal is fixed to the container by heating, the core rod and the sintered metal are fixed to each other, which makes it difficult to pull out the core rod.

If the core rod cannot be pulled out easily from the container, the time required to manufacture the heat pipe becomes long, and the productivity of the heat pipe decreases.

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

The present inventors considered using an intermetallic compound of Sn or Sn alloy, which is the first metal, and Cu alloy, which is 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, when the temperature reaches the melting point of the first metal or higher, the first metal melts. When the heating is further continued, the first metal and the second metal react with each other to form an intermetallic compound (for example, (Cu,Ni) ₆ Sn ₅ ). Since voids (pores) are generated when the intermetallic compound portion is formed, the intermetallic compound becomes porous suitable for the wick structure.

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

In the first embodiment of the present invention, a rod-shaped wick structure is prepared in advance, and the wick structure is inserted into and fixed in a tubular container, whereby the heat pipe can be manufactured without pulling out the core rod from the 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 a copper powder sintered body is manufactured as the wick structure, it is necessary to perform sintering at a high temperature of about 900° C. Therefore, it is not possible to separately manufacture the wick structure before inserting it into the container. Was not done. On the other hand, when a wick structure made of an intermetallic compound of the first metal and the second metal is produced, heating can be performed at a low temperature of about 300° C. Therefore, the wick structure can be easily produced. You can

A method of manufacturing a heat pipe according to a second embodiment of the present invention includes a step of preparing a metal rod made of Sn or a Sn alloy which is a first metal, and a space between an inner wall of a tubular container and the metal rod. A step of inserting the metal rod and the metal powder into the container so that the metal powder containing the second metal Cu alloy is filled, and the metal rod and the metal powder inserted into the container. Is heated to react the first metal forming the metal rod with the second metal contained in the metal powder to form a wick structure composed of an intermetallic compound, and And a step of forming voids.

In the second embodiment of the present invention, a metal rod made of a first metal is used instead of the conventionally used core rod, and the metal rod and the metal powder containing the second metal are inserted into a container. By heating the metal rod and the metal powder inserted into the container, the first metal forming the metal rod reacts with the second metal contained in the metal powder to form a wick structure made of an intermetallic compound. At the same time, since 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 placed in a space between the inner wall of the container and the metal rod. It may be filled with powder. In the step of inserting the metal rod and the metal powder, after the metal powder is filled in the container, the metal rod may be inserted in the container so as to push out the metal powder in the container. Good. Further, in the step of inserting the metal rod and the metal powder, the metal powder may be attached to the periphery of the metal rod, and then the metal rod to which the metal powder is attached may be inserted into the container.

A method of manufacturing a heat pipe according to a third embodiment of the present invention includes a step of preparing a mesh sheet containing Sn or Sn alloy which is a first metal and Cu alloy which is a second metal, and an inner wall of a tubular container. The step of inserting the mesh sheet into the container so as to follow, and heating the mesh sheet inserted into the container to separate the first metal and the second metal forming the mesh sheet. A step of reacting to form a wick structure made of an intermetallic compound.

In the third embodiment of the present invention, the mesh sheet containing the first metal and the second metal is inserted into the container along the inner wall of the container. By heating the mesh sheet inserted into the container, the first metal and the second metal forming the mesh sheet react with each other 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 that the mesh sheet is produced by plating the mesh made of the second metal with the first metal. Further, in the step of preparing the mesh sheet, it is preferable that the mesh sheet is produced by adhering the metal powder containing the first metal to the mesh made of the second metal.
By using the mesh made of the second metal, the porosity of the wick structure formed after the reaction 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.

A method of manufacturing a heat pipe according to a 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 that is a second metal is wound around the core rod, and an inner wall of a tubular container. The core rod with mesh and the metal powder so that the space between the core rod with mesh and the core rod with mesh is filled with metal powder containing Sn or Sn alloy as the first metal and the second metal. The step of inserting into the container and the core rod with mesh and the metal powder inserted into the container are heated to cause the first metal and the second metal contained in the metal powder to react with each other. A step of reacting the first metal contained in the metal powder with the second metal forming the core rod with mesh to form a wick structure made of an intermetallic compound; and the core rod from the container. And a step of pulling out.

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

In the method for manufacturing the heat pipe according to the fifth embodiment of the present invention, at least the surface is made of a resin, and the resin is a metal in which Sn or Sn alloy as the first metal reacts with Cu alloy as the second metal. A step of 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 the tubular container; and the core rod. Inserting the core rod and the metal powder into the container so that the space between them is filled with the metal powder containing the first metal and the second metal; and inserting the core rod and the metal powder into the container. And 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 composed of an intermetallic compound; And a step of pulling out the core rod from the container.

In the fifth embodiment of the present invention, as a material for the core rod, a heat having a melting point higher than the temperature at which the intermetallic compound forming the wick structure is formed and having a thermal expansion coefficient larger than that of the intermetallic compound is used. A resin having a coefficient of expansion is used. Since such a resin expands during heating to form an intermetallic compound, a wick structure made of the intermetallic compound is formed while being pressed by the expanded resin. On the other hand, since the resin contracts during cooling after heating, a gap is created between the wick structure and the core rod. 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 method for manufacturing the heat pipe 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 placed 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 that the metal powder containing the metal powder can be filled; and the metal powder in the container with the core rod inserted, Heating at a temperature below the melting point to cause a part of the first metal and a part of the second metal contained in the metal powder to react to form an intermetallic compound; and the core from the container. The step of pulling out the rod and heating the metal powder in the container in the state where the core rod is pulled out at a temperature equal to or higher than the melting point of the first metal causes the unreacted first metal powder contained in the metal powder. Reacting one metal with the second metal to form a wick structure composed of an intermetallic compound.

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

In the sixth embodiment of the present invention, the core rod is composed 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, it is preferable to heat the core rod.
By heating the core rod, the metal powder in the portion in contact with the core rod can be made into an intermetallic compound, so that the core rod can be easily pulled out 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 easily from a container can be provided.

FIG. 1 is a 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 the heat pipe manufactured by the heat pipe manufacturing method of the present invention. FIG. 3 is a perspective view schematically showing an example of the method for manufacturing the heat pipe 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), 5(b), 5(c), 5(d), 5(e) and 5(f) are manufacturing of the heat pipe according to the first embodiment of the present invention. It is sectional drawing which shows another example of the heat pipe obtained by the method typically. 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 the container are flat. 7(a), FIG. 7(b), FIG. 7(c1), FIG. 7(c2), FIG. 7(d1) and FIG. 7(d2) are heat pipes in which both sides or one side of the container is flat. FIG. 6 is a cross-sectional view schematically showing another example of the manufacturing method of FIG. 8(a), 8(b), 8(c) and 8(d) are cross-sectional views schematically showing still another example of the method for manufacturing the heat pipe in which one side surface of the container is flat. Is. FIG. 9A and FIG. 9B are cross-sectional views schematically showing still another example of the heat pipe obtained by the method for manufacturing the heat pipe according to the first embodiment of the present invention. FIG. 10: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 2nd Embodiment of this invention. FIG. 11: is a perspective view which shows typically the example of the process of inserting a metal rod and a metal powder. FIG. 12: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 3rd Embodiment of this 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 which shows typically an example of the manufacturing method of the heat pipe which concerns on 5th Embodiment of this invention. FIG. 15 is a perspective view schematically showing another example of the heat pipe manufacturing method according to the fifth embodiment of the present 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, a method for manufacturing the heat pipe of the present invention will be described.
However, the present invention is not limited to the following configurations, and can be appropriately modified and applied without departing from the scope of the present invention. Note that a combination of two or more of the respective desirable configurations of the present invention described below is also the present invention.

FIG. 1 is a sectional view schematically showing an example of a heat pipe manufactured by the heat pipe manufacturing method of the present invention.
The heat pipe 1 shown in FIG. 1 includes a container 10 and a wick structure 11. The wick structure 11 is fixed to the center 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 tubular shape, but the 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 and the working fluid is sealed in the container 10.

FIG. 2 is a cross-sectional view schematically showing another example of the 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 void 22 is formed in the center of the container 20. In FIG. 2, the container 20 has a tubular 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 tubular shape. Although not shown in FIG. 2, a non-condensable gas such as air is degassed and the working fluid is enclosed in the container 20.

As a method of manufacturing the heat pipe, a method of manufacturing the heat pipe according to the first embodiment to the sixth embodiment 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 the method according to the second to sixth embodiments of the present invention. Can be manufactured by.

It is needless to say that the respective embodiments shown below are exemplifications, and partial replacements or combinations of the configurations shown in the different embodiments are possible. In the second and subsequent embodiments, description of items common to the first embodiment will be omitted, and only different points will be described. In particular, similar effects obtained 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 the method for manufacturing the heat pipe according to the first embodiment of the present invention.

First, as shown in 1A of FIG. 3, a rod-shaped wick structure 11 made of an intermetallic compound of a first metal and a second 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 a firing jig made of a heat-resistant ceramic such as alumina with the metal powder and heating it. .. The porosity of the wick structure can be adjusted by adjusting the shape or particle size of the metal powder.

The wick structure can be prepared by immersing a mesh made of a second metal into a rod shape, immersing it in a molten first metal, and heating it, or a porous rod made of a second metal. Can also be produced by immersing in a molten first metal and heating it. In the above method, it is possible to provide pores of different sizes as compared with the method of heating the metal powder containing the first metal and the second metal, and the porosity of the obtained sintered body is adjusted. 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 of the first metal and the second metal, whereas in the method described above, In addition to the formation of pores by the alloying reaction, the pores originally present in the mesh or porous rod made of the second metal can be left. 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 will not wet the center of the pores, and the large pores will remain as cavities, and the alloying reaction Creates new small pores. The proportion of pores of different sizes can be adjusted by 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, 180 minutes or shorter, and more preferably 60 minutes or shorter.

The first metal is Sn or a Sn alloy, for example, Sn alone, or Cu, Ni, Ag, Au, Sb, Zn, Bi, In, Ge, Al, Co, Mn, Fe, Cr, Mg, Mn. And an alloy containing Sn and at least one selected from the group consisting of Pd, Si, Sr, Te and P. 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 are preferable.
In the above notation, for example, “Sn-3Ag-0.5Cu” indicates that it is 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, Cu-Ni alloy or Cu-Mn alloy is preferable.
The Cu-Ni alloy is preferably a Cu-Ni alloy in which the proportion of Ni is 5% by weight or more and 30% by weight or less, and for example, Cu-5Ni, Cu-10Ni, Cu-15Ni, Cu-20Ni, Cu-25Ni, or , Cu-30Ni. The Cu-Ni alloy also includes alloys containing a third component such as Cu-Ni-Co alloy and Cu-Ni-Fe alloy.
The Cu-Mn alloy is preferably a Cu-Mn alloy in which the proportion of Mn is 5% by weight or more and 30% by weight or less, and for example, Cu-5Mn, Cu-10Mn, Cu-15Mn, Cu-20Mn, Cu-25Mn, or , Cu-30Mn.
The Cu-Al alloy is preferably a Cu-Al alloy in which the proportion of Al is 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 in which the proportion of Cr is 5% by weight or more and 10% by weight 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 that it is an alloy containing 5% by weight of Ni and the balance being Cu. The same applies to Mn, Al or Cr.

When the temperature reaches or exceeds the melting point of the first metal (for example, Sn) by heating the metal powder containing the first metal and the second metal, the first metal melts. When the heating is further continued, the first metal and the second metal (for example, Cu—Ni alloy) react with each other to generate an intermetallic compound (for example, (Cu,Ni) ₆ Sn ₅ ). Voids (pores) are formed in the intermetallic compound due to the reaction in which the intermetallic compound is generated, so that the intermetallic compound becomes porous. From the viewpoint of making the intermetallic compound porous, it is preferable to react the first metal and the second metal without pressurizing them.

The intermetallic compound in the wick structure can be easily confirmed by observing the cross section of the wick structure with a metallurgical microscope. In detail, the composition analysis by energy dispersive X-ray analysis (EDX) and the crystal structure analysis by minute part X-ray diffraction are performed to confirm the intermetallic compounds such as (Cu,Ni) ₆ Sn _5. can do.

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

Next, as shown in FIG. 1B, the wick structure 11 is inserted into the tubular container 10 ′. Although one wick structure 11 is inserted in 1B of FIG. 3, two or more wick structures may be inserted.

Since the container needs to transfer heat internally and externally, it is preferable that the container is made of a material having high thermal conductivity. As the material of the container, for example, a metal such as copper or aluminum can be used. Further, since the heat pipe is required to have heat resistance and mechanical strength capable of withstanding internal vapor pressure and external force, for example, stainless steel, copper alloy, carbon steel, etc. may be used as the material of the container. it can. The shape of the container is not particularly limited and may be a tubular shape other than the cylindrical shape. 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.

Then, the container is deformed. As a result, as shown in 1C of FIG. 3, the wick structure 11 is fixed in the container 10 with the gap 12 left between the inner wall of the container 10 and the wick structure 11.

Examples of methods for deforming the container include rolling methods such as hot rolling and cold rolling, and processing methods such as bending. Since the intermetallic compound forming the wick structure is a brittle member, it is preferable to perform the above processing 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 the anchor effect.

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

Then, if necessary, the non-condensable gas such as air existing inside the container is degassed, and the working liquid is sealed in the container. As the working fluid, water, ethanol, methanol, naphthalene, benzene, CFC substitute, ammonia, etc. can be used. For degassing of non-condensable gas, a vacuum degassing method or a method of injecting an excessive amount of hydraulic fluid in advance and heating the container to boil the hydraulic fluid to expel non-condensable gas 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-shaped wick structures 11 are prepared. As shown in FIG. 1B, after inserting the two wick structures 11 into the tubular container 10′, the container 10′ is deformed. As a result, as shown in FIG. 1C, the two wick structures 11 are fixed in the container 10 with the gap 12 left between the inner wall of the container 10 and the two wick structures 11. .. Thus, more than one wick structure may be inserted into the container.

5(a), 5(b), 5(c), 5(d), 5(e) and 5(f) are manufacturing of the heat pipe according to the first embodiment of the present invention. It is sectional drawing which shows another example of the heat pipe obtained by the method typically.
As in the heat pipe 1a shown in FIG. 5A, the heat pipe 1b shown in FIG. 5B, and the heat pipe 1c shown in FIG. 5C, both side surfaces of the container 10 may be flat. However, 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), one side surface of the container 10 is flat. Good. By flattening both side surfaces or one side surface of the container, the heat pipes can be mounted in a more dense space, so that the storage efficiency can be improved. Then, by increasing the storage efficiency, the heat transfer efficiency of the heat pipe mounting portion can be expected to improve.

The heat pipe in which both side surfaces or one side surface of the container is flat can be manufactured by, for example, the following method. In the method described below, the container can have any shape, such as not only the shape in which both side surfaces or one side surface of the container is flat, but also the shape in which portions other than the side surfaces are 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 the container are flat.
After inserting the wick structure 11 into the tubular container 10' as shown in FIG. 6(a), the container 10' is pressed as shown in FIG. 6(b). Thereby, as shown in FIG. 6C, for example, the shape of the heat pipe 1a shown in FIG. 5A is obtained.

7(a), FIG. 7(b), FIG. 7(c1), FIG. 7(c2), FIG. 7(d1) and FIG. 7(d2) are heat pipes in which both sides or one side of the container is flat. FIG. 6 is a cross-sectional view schematically showing another example of the manufacturing method of FIG.
As shown in FIGS. 7A and 7B, a plate-shaped (including foil-shaped) container 10″ is molded. Here, as shown in FIG. 7(c1), after inserting the wick structure 11 so as to be housed in the two molded containers 10″, the ends of the container 10″ are welded or the like. By sealing, 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. 7(c2), after the wick structure 11 is inserted so as to be housed inside the molded container 10″ and the unmolded container 10″, the container 10 is welded or the like. By sealing the ends of the ″, the shape of the heat pipe 1b shown in FIG. 5B, for example, can be 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 the method for manufacturing the heat pipe in which one side surface of the container is flat. Is.
As shown in FIGS. 8A and 8B, a plate-shaped (including foil-shaped) container 10″ is molded. As shown in FIG. 8( c ), after inserting the wick structure 11 so as to be housed 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 side surfaces or one side surface 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-way Examples include a method of injecting a working liquid from an unsealed port after sealing, and finally sealing the four sides.

FIG. 9A and FIG. 9B are cross-sectional views schematically showing still another example of the heat pipe obtained by the method for manufacturing the heat pipe 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 that of FIG. 1, but FIGS. 5(a), 5(b), 5(c), 5(d), It may be the same as FIG. 5( e) and FIG. 5( f ).

As described above, the shape of the wick structure is not limited to the cylindrical shape or the truncated cone shape, and may be a semi-cylindrical shape, a square pillar shape (preferably a rectangular parallelepiped shape), a prism shape such as a hexagonal shape, Good. In particular, the wick structure having a shape such as a semi-cylindrical shape or a prismatic shape is preferably used for a thin heat pipe.

The wick structure having a predetermined shape, for example, when the metal powder containing the first metal and the second metal is filled in a firing jig, the metal powder is arranged so as to have a desired shape, Can be produced by heating. When the wick structure has a curved surface portion 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. Further, when the wick structure has a flat surface such as a prismatic shape, when the wick structure is inserted into the container, the flat surface such as the side surface can be held and transported, so that the wick structure can be stabilized. There is an advantage that they can be transported after being transported.

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

(Second embodiment)
FIG. 10: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 2nd Embodiment of this invention.

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

The first metal is Sn or a Sn alloy, and examples thereof include those described in the first embodiment.

The metal rod preferably has a hollow tubular shape as shown in 2A of FIG. In this case, a rolled foil (for example, Sn foil) made of the first metal is also included, and two or more layers may be overlapped. When the metal rod has a hollow tubular shape, at least one end surface 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 has a hollow tubular shape, it is preferable to fill the hollow portion with the metal powder 24 so that the metal powder 24 does not enter the hollow portion.

The material, shape, etc. of the container 20 are the same as those of the container 10' described in the first embodiment.

The metal powder contains a second metal. The second metal is a Cu alloy, and examples thereof include those described in the first embodiment. 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 which shows typically the example of the process of inserting a metal rod and a metal powder.
In 2B-1 of FIG. 11, after the metal rod 23 is inserted 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 has a hollow tubular shape, it is preferable that at least the end surface on the metal powder insertion side is sealed so that the metal powder 24 does not enter the hollow portion.
In 2B-2 of FIG. 11, after the metal powder 24 is filled in the container 20, 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 face on the side where the metal rod is inserted (the end face on the left side of the paper in FIG. 11B-2B) is sealed so that the metal powder 24 does not enter the hollow portion. Is preferred.
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 has a hollow tubular shape, at least one end face may be sealed. As a method of attaching the metal powder around the metal rod, a method of applying a paste containing the metal powder around the metal rod, a method of plating metal particles on the metal rod, a method of spraying the metal powder on the metal rod, etc. Are listed.
When using a metal rod to which the metal powder is attached as in 2B-3 of FIG. 11, the metal rod may be further filled after the metal rod is inserted into the container, or the metal powder may be filled. The metal rod may be inserted into the container.

Then, the metal rod and the metal powder inserted in the container are heated. As a result, the first metal forming the metal rod reacts with the second metal contained in the metal powder to generate an intermetallic compound, and the metal rod disappears. As a result, as shown in 2C of FIG. 10, the wick structure 21 made of the intermetallic compound is formed and the void 22 is formed in the container 20. By solidifying the molten intermetallic compound, 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, it is preferably 250° C. or higher and 350° C. or lower. The heating time is preferably 10 minutes or longer, 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 forming the wick structure is porous, the working fluid can be moved by the capillary phenomenon. On the other hand, the void in the container functions as a vapor flow path.

Then, 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. Before the working fluid is sealed in the container or after the working fluid is sealed in the container, the container may be subjected to flattening, bending or the like.

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

(Third Embodiment)
FIG. 12: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 3rd Embodiment of this invention.

First, as shown in 3A of FIG. 12, a mesh sheet 35 containing a first metal and a second metal is prepared.

The first metal is Sn or a Sn alloy, and examples thereof include those described in the first embodiment. The second metal is a Cu alloy, and examples thereof include those described in the first embodiment.

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 predetermined intervals.

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

Further, it is preferable that the mesh sheet is produced by adhering a metal powder containing the first metal to a mesh made of the second metal. In this case, the 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 forming the mesh, but is preferably the same as the second metal forming 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. The content of the second metal in the metal powder is preferably 20% by weight or more and 60% by weight or less.

As a method of attaching the metal powder to the mesh, a method of filling the mesh with the metal powder, a method of applying a paste containing the metal powder to the mesh, a method of plating the metal particles on the mesh, and a method of 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 equal to or smaller than the mesh size of the mesh, the mesh of the mesh is filled with the metal powder, and the wick structure formed after the reaction may be dense.

Next, as shown in 3B of FIG. 12, the mesh sheet 35 is inserted into the tubular container 20. At this time, without using the core rod, 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. Although one mesh sheet 35 is inserted in 3B of FIG. 12, two or more mesh sheets may be inserted. Moreover, the mesh sheets inserted in the container may be overlapped in two or more layers.

When a mesh sheet having metal powder adhered to only one main surface of the mesh is used, it is preferable to roll the mesh sheet so that the main surface to which the metal powder adheres is on the inside and insert it into the container.

The material, shape, etc. of the container 20 are the same as those of the container 10' described in the first embodiment.

Then, the mesh sheet inserted in the container is heated. As a result, the first metal and the second metal forming the mesh sheet react with each other to generate an intermetallic compound. As a result, as shown in 3C of FIG. 12, a wick structure 21 made of an intermetallic compound is formed. In addition, a void 22 is formed in the container 20. By solidifying the molten intermetallic compound, the wick structure made of the intermetallic compound is fixed in the container. A part of the mesh sheet may remain without reacting.

The heating temperature is preferably a temperature equal to or higher than the melting point of the first metal, and specifically, it is preferably 250° C. or higher and 350° C. or lower. The heating time is preferably 10 minutes or longer, 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 forming the wick structure is porous, the working fluid can be moved by the capillary phenomenon. On the other hand, the void in the container functions as a vapor flow path.

Then, 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. Before the working fluid is sealed in the container or after the working fluid is sealed in the container, the container may be subjected to flattening, bending or the like. Further, after the mesh sheet is inserted into the container and before the mesh sheet is heated, the above processing may be performed.

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 meshed core rod 46 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. Further, the mesh sheets wound around the core rod may be overlapped by two or more layers.

The second metal is a Cu alloy, and examples thereof include those described in the first embodiment. Moreover, as the mesh shape of the mesh sheet, those described in the third embodiment can be mentioned.

The material of the core rod has a melting point higher than the temperature at which the first metal and the second metal react to form an intermetallic compound, and at the temperature at which the intermetallic compound forms, the first metal and the second metal Those that do not react with metals are preferred. As the material of 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 it is preferably cylindrical. The core rod may have a cutout portion along the major axis direction, or may have a dividable shape. Further, the shape of the core rod may be a truncated cone shape. The length of the core rod is not particularly limited, but it is preferably the same as the length of the container or longer than the container.

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

The material, shape, etc. of the container 20 are the same as those of the container 10' described in the first embodiment.

The metal powder contains a first metal and a second metal. The first metal is Sn or a Sn alloy, and examples thereof include those described in the first embodiment. The second metal contained in the metal powder may be different from the second metal forming the mesh, but is preferably the same as the second metal forming 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. Further, 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 the 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 are The method of filling the space with metal powder, the method of filling the metal powder in the container, and then inserting the core rod with mesh into the container so as to push out the metal powder in the container, the metal of the mesh of the core rod with mesh After attaching the powder, a method of inserting the core rod with mesh to which the metal powder is attached into the container can be mentioned. When using a core rod with a mesh to which metal powder is attached, the core rod with a mesh may be further filled with metal powder after inserting the core rod with a mesh into the container. A core rod may be inserted.

Subsequently, the core rod with mesh and the metal powder inserted into 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 forming the core rod with a mesh 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. By solidifying the molten intermetallic compound, the wick structure made of the intermetallic compound is fixed in the container. Since the mesh made of the second metal is wrapped 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 becomes the core rod. It becomes difficult to make contact with each other, and the sticking of the core rod and the intermetallic compound is prevented. A part of the mesh wrapped around the core rod may remain without reacting. In particular, from the viewpoint of preventing the core rod and the intermetallic compound from sticking to each other, it is preferable that the mesh in the portion in contact with the core rod remains without reacting.

The heating temperature is preferably a temperature equal to or higher than the melting point of the first metal, and specifically, it is preferably 250° C. or higher and 350° C. or lower. The heating time is preferably 10 minutes or longer, 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 forming the wick structure is porous, the working fluid can be moved by the capillary phenomenon.

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

Then, 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. Before the working fluid is sealed in the container or after the working fluid is sealed in the container, the container may be subjected to flattening, bending or the like.

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

(Fifth Embodiment)
FIG. 14: is a perspective view which shows typically an example of the manufacturing method of the heat pipe which concerns on 5th Embodiment of this invention.

First, as shown in 5A of FIG. 14, a core rod 53 made of resin is prepared. In 5A of FIG. 14, the core rod 53 made entirely of resin is shown, but a core rod made of resin at least on the surface may be used. Further, although a columnar core rod is shown in 5A of FIG. 14, the core rod may be a round rod having at least one tip tapered. Further, 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. It is preferable that the resin further does not react with the first metal and the second metal at a temperature at which the intermetallic compound is formed.

Examples of the resin material include silicone resin, polybenzimidazole resin (PBI), polyetheretherketone resin (PEEK), polyimide resin (PI), polyamideimide resin (PAI), polytetrafluoroethylene resin (PTFE). , Perfluoroalkoxy resin (PFA) and the like. Of these, silicone resin is preferred.

When the core rod contains a material other than resin, examples of the material other than resin include those described in the fourth embodiment. The shape and length of the core rod are the same as those of the core rod described in the fourth 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 material, shape, etc. of the container 20 are the same as those of the container 10' described in the first embodiment.

The metal powder contains a first metal and a second metal. The first metal is Sn or a Sn alloy, and examples thereof include those described in the first embodiment. The second metal is a Cu alloy, and examples thereof include those described in the first embodiment.

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.

The method of inserting the core rod and the metal powder into the container is the same as that of the second embodiment, that is, the metal powder is inserted into the space between the inner wall of the container and the core rod after inserting the core rod into the container. Method, after filling the metal powder in the container, inserting the core rod into the container so as to push out the metal powder in the container, after attaching the metal powder around the core rod, Examples include a method of inserting the attached core rod into the container. When using the core rod to which the metal powder is attached, the core rod may be further filled with metal powder after inserting the core rod into the container, or the core rod may be inserted into the container filled with metal powder. Good.

Then, the core rod and the 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 to generate an intermetallic compound. As shown in 5C of FIG. 14, since the resin forming the core rod 53 expands during heating, the wick structure 21 made of an intermetallic compound is formed while being pressed by the expanded resin. On the other hand, since the resin contracts during cooling after heating, a gap 52 is formed between the wick structure 21 and the core rod 53. By solidifying the molten intermetallic compound, 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, it is preferably 250° C. or higher and 300° C. or lower. The heating time is preferably 10 minutes or longer, 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 forming the wick structure is porous, the working fluid can be moved by the capillary phenomenon.

Then, as shown in 5D of FIG. 14, the core rod 53 is pulled out from the container 20. As a result, the void 22 is formed in the container 20. The void in the container functions as a vapor flow path. As described above, since the gap is formed between the wick structure and the core rod, the core rod can be easily pulled out from the container.

Then, 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. Before the working fluid is sealed in the container or after the working fluid is sealed in the container, the container may be subjected to flattening, bending or the like.

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

FIG. 15 is a perspective view schematically showing another example of the heat pipe manufacturing method according to the fifth embodiment of the present 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. As described above, at least one tip of the core rod is preferably 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 in 6A of FIG. 16, the core rod 63 and the metal powder 64 are inserted into the tubular container 20. 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.

The material, shape, etc. of the container 20 are the same as those of the container 10' described in the first embodiment.

As the material of the core rod, those described in the fourth embodiment can be mentioned. As will be described later, when the core rod is made to generate heat, the core rod is preferably made of a heating element. Specifically, it is preferable to use a ceramic tube containing a heating wire as a core rod, and more preferable to use an alumina tube containing a nichrome wire as a core rod. The shape and length of the core rod are the same as those of the core rod described in the fourth embodiment.

The metal powder contains a first metal and a second metal. The first metal is Sn or a Sn alloy, and examples thereof include those described in the first embodiment. The second metal is a Cu alloy, and examples thereof include those described in the first embodiment.

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.

The method of inserting the core rod and the metal powder into the container is the same as that of the second embodiment, that is, the metal powder is inserted into the space between the inner wall of the container and the core rod after inserting the core rod into the container. Method, after filling the metal powder in the container, inserting the core rod into the container so as to push out the metal powder in the container, after attaching the metal powder around the core rod, Examples include a method of inserting the attached core rod into the container. When using the core rod to which the metal powder is attached, the core rod may be further filled with metal powder after inserting the core rod into the container, or the core rod may be inserted into the container filled with metal powder. Good.

Next, the metal powder in the container with the core rod inserted therein 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 with each other, 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 core rod to heat the metal powder. By heating the core rod, the metal powder in 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, 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.

Then, as shown in 6C of FIG. 16, the core rod 63 is pulled out from the container 20. As a result, the void 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 with the core rod pulled out is heated at a temperature equal to or higher than the melting point of the first metal. As a result, the unreacted first metal and second metal contained in the metal powder react with each other to produce an intermetallic compound. As a result, as shown in 6D of FIG. 16, a wick structure 21 made of an intermetallic compound is formed. As the molten intermetallic compound solidifies, 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 the melting point of the first metal or higher, but is preferably 250° C. or higher and 350° C. or lower. The heating time is preferably 10 minutes or longer, 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 forming the wick structure is porous, the working fluid can be moved by the capillary phenomenon. On the other hand, the void in the container functions as a vapor flow path.

Then, 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. Before the working fluid is sealed in the container or after the working fluid is sealed in the container, the container may be subjected to flattening, bending or the like.

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 may be combined with the fourth embodiment and the fifth embodiment. Good.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 2 heat pipes 10, 10', 10'', 20 containers 11, 11a, 11b, 21 wick structure 12, 22 voids 23 metal rods 24 , 44, 54, 64 Metal powder 35 Mesh sheet 43, 53, 53', 63 Core rod 45 Mesh 46 Core rod with mesh 52 Gap 61 Intermetallic compound

Claims (6)

At least the surface is made of resin, and the resin reacts with Sn or Sn alloy which is the first metal and Cu-Ni alloy, Cu-Mn alloy, Cu-Al alloy or Cu-Cr alloy which is the second metal. A step of 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 the thermal expansion coefficient 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. The process of
By heating the core rod and the metal powder inserted in the container at a temperature of 350° C. or less, the first metal and the second metal contained in the metal powder are reacted with each other to form an intermetallic compound. Forming a wick structure composed of
Withdrawing the core rod from the container,
A method for manufacturing a heat pipe, comprising: The heat pipe manufacturing method according to claim 1, wherein at least one tip of the core rod is tapered. The method for manufacturing a heat pipe according to claim 1, 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 method for manufacturing the heat pipe according to any one of 1. In the step of inserting the core rod and the metal powder, after the metal powder is filled in the container, the core rod is inserted in the container so as to push out the metal powder in the container. 4. The method for manufacturing the heat pipe according to any one of 3 above. The step of inserting the core rod and the metal powder, after depositing the metal powder around the core rod, and then inserting the core rod to which the metal powder is attached into the container. The method for manufacturing the heat pipe according to claim 1.

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