Heat pipe, heat dissipating component, and method for manufacturing heat pipe

Patent metadata

Field	Value
Publication number	US-2018128554-A1
Application number	US-201815864369-A
Country	US
Kind code	A1
Filing date	Jan 8, 2018
Priority date	Sep 28, 2015
Publication date	May 10, 2018
Grant date	—

Abstract

A heat pipe that includes a pipe casing, a porous wick, and sealing members. Both end portions of the pipe casing are sealed by the sealing members, respectively. The sealing members each comprise a first metal foil and an intermetallic compound phase. The inside of the pipe casing is filled with a working fluid. The porous wick generates capillarity for the working fluid by a plurality of pores. The porous wick is provided inside the pipe casing. As a result, the pipe casing and the porous wick form a cavity extending in a longitudinal direction of the pipe casing. The porous wick comprises first metal grains, second metal grains, and an intermetallic compound phase.

First claim

1 . A heat pipe comprising:
a pipe casing filled with a working fluid; and a porous wick inside the pipe casing, wherein the porous wick includes an intermetallic compound formed from at least a first metal and a second metal having a melting point higher than a melting point of the first metal.

2 . The heat pipe according to claim 1 , wherein the porous wick comprises a material containing the first metal, the second metal, and the intermetallic compound.

3 . The heat pipe according to claim 1 , wherein the porous wick has a porosity of 20% or more.

4 . The heat pipe according to claim 1 , wherein
the first metal is at least one kind of metal selected from Sn and a Sn-based alloy; and the second metal is at least one kind of alloy selected from a CuNi alloy, a CuMn alloy, a CuAl alloy, and a CuCr alloy.

5 . A heat dissipating component comprising the heat pipe according to claim 1 .

6 . A heat pipe comprising:
a pipe casing filled with a working fluid; a wick provided inside the pipe casing; and a sealing member that seals the pipe casing; wherein the sealing member includes an intermetallic compound formed from at least a first metal and a second metal having a melting point higher than a melting point of the first metal.

7 . The heat pipe according to claim 6 , wherein the sealing member seals an end portion of the pipe casing.

8 . The heat pipe according to claim 6 , wherein the sealing member comprises a material containing the first metal and the intermetallic compound.

9 . The heat pipe according to claim 6 , wherein
the first metal is at least one kind of metal selected from Sn and a Sn-based alloy; and the second metal is at least one kind of alloy selected from a CuNi alloy, a CuMn alloy, a CuAl alloy, and a CuCr alloy.

10 . A heat dissipating component comprising the heat pipe according to claim 6 .

11 . A method for manufacturing a heat pipe, the method comprising:
providing a metal composition inside a pipe casing, the metal composition containing a first metal and a second metal having a melting point higher than a melting point of the first metal; and heating the metal compound and causing the first metal and the second metal to react with each other to form a porous wick comprising a material containing an intermetallic compound inside the pipe casing.

12 . The method for manufacturing a heat pipe according to claim 11 , wherein the metal composition is in a paste state, and the metal composition is applied to the inside of the pipe casing while in the paste state.

13 . The method for manufacturing a heat pipe according to claim 11 , wherein the metal composition contains a flux.

14 . The method for manufacturing a heat pipe according to claim 11 , wherein, in the heating, the metal composition is heated to a temperature within a range of equal to or higher than the melting point of the first metal and equal to or lower than the melting point of the second metal.

15 . A method for manufacturing a heat pipe, the method comprising:
providing a metal composition in an end portion of a pipe casing, the metal composition containing a first metal and a second metal having a melting point higher than a melting point of the first metal; and heating the metal compound and causing the first metal and the second metal to react with each other to form a sealing material containing an intermetallic compound inside the pipe casing.

16 . The method for manufacturing a heat pipe according to claim 15 , wherein the metal composition contains a flux.

17 . The method for manufacturing a heat pipe according to claim 15 , wherein in the heating, the metal composition is heated to a temperature within a range of equal to or higher than the melting point of the first metal and equal to or lower than the melting point of the second metal.

Assignees

• Murata Manufacturing Co

Inventors

• Washizuka Seitaro
• Kawaguchi Yoshihiro
• Kitamura Takashi

Classifications

• F28F19/00

  Preventing the formation of deposits or corrosion, e.g. by using filters {or scrapers} · CPC title

• F28D15/0283

  Means for filling or sealing heat pipes · CPC title

• F28F21/081

  Heat exchange elements made from metals or metal alloys · CPC title

• F28D2021/0028

  for cooling heat generating elements, e.g. for cooling electronic components or electric devices · CPC title

• F28F21/085

  from copper or copper alloys · CPC title