HEAT TRANSPORT STRUCTURE AND MANUFACTURING METHOD THEREOF

• US 20170368795A1
• Filed: 12/25/2015
• Published: 12/28/2017
• Est. Priority Date: 12/25/2014
• Status: Active Grant

• Current Assignee: Kaneka Corporation
• Original Assignee: Kaneka Corporation
• Inventors: KUTSUMIZU, Makoto, OKU, Satoshi, KATO, Yusuke, NISHIKAWA, Yasushi
• Granted Patent: US 10,710,333 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 27/281 comprising polyimides
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 9/00 Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
• CPC Class Codes: B32B 9/007 comprising carbon, e.g. graphite, composite carbon
• CPC Class Codes: B32B 9/04 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: B32B 9/045 of synthetic resin
• CPC Class Codes: C01B 32/182 Graphene
• CPC Class Codes: C01B 32/20 Graphite
• CPC Class Codes: C01B 32/21 After-treatment
• CPC Class Codes: C04B 35/52 based on carbon, e.g. graphite
• CPC Class Codes: F28F 3/00 Plate-like or laminated elements; Assemblies of plate-like or laminated elements specially adapted for movement F28F5/00
• CPC Class Codes: H01L 23/36 Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks H01L23/28, H01L23/40, H01L23/42, H01L23/44, H01L23/46 take precedence; heating H01L23/345
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 7/20 Modifications to facilitate cooling, ventilating, or heating

Abstract

In order to provide a thermal transport structure excellent in bendability, heat dissipation property, and lightweight property and also a thermal transport structure having a high reliability against vibrations and an excellent heat transport performance, used is a thermal transport structure (5, 201) including stacked graphite sheets (1, 213). This thermal transport structure (5, 201) includes a fixing portion (10, 202, 301) in which the stacked graphite sheets (1, 213) are fixed to each other;

and a thermally conductive portion (11, 203) in which the stacked graphite sheets (1, 213) are not fixed to each other.

Claims

1. A thermal transport structure including at least two graphite sheets or at least two graphite composite sheets each including a graphite sheet and a covering layer, the covering layer covering at least part of (i) a surface and (ii) an edge of the graphite sheet, the at least two graphite sheets or the at least two graphite composite sheets being stacked on top of each other as layers, the thermal transport structure comprising:

at least two fixing portions; and

a thermally conductive portion between the fixing portions,

in each of the fixing portions, the graphite sheets or the graphite composite sheets being kept in a state in which the graphite sheets or the graphite composite sheets are in contact with each other or bonded to each other, and

in the thermally conductive portion, the graphite sheets or the graphite composite sheets being at least partially out of contact with each other or at least partially not bonded to each other.

2. The thermal transport structure as set forth in claim 1, wherein:

the at least two graphite sheets are stacked on top of each other as layers; and

in each of the fixing portions, a bonding layer is present between the graphite sheets and the graphite sheets are kept in a state in which the graphite sheets are bonded to each other via the bonding layer.

3. The thermal transport structure as set forth in claim 2, wherein:

the bonding layer is further provided on at least part of (i) a surface of any one or more of the graphite sheets in the thermally conductive portion and (ii) an outer peripheral edge of any one or more of the graphite sheets of the thermal transport structure.

4. The thermal transport structure as set forth in claim 2, wherein:

the bonding layer is further provided on at least part of (i) a surface of the thermally conductive portion of the thermal transport structure and (ii) an outer peripheral edge of the thermal transport structure.

5. The thermal transport structure as set forth in claim 1, wherein:

the at least two graphite composite sheets are stacked on top of each other as layers;

the graphite sheet included in each of the graphite composite sheets has both surfaces entirely covered by the covering layer; and

in each of the fixing portions, the graphite composite sheets are kept in a state in which the graphite composite sheets are bonded to each other via the covering layer present at the surfaces of each of the graphite composite sheets.

6. The thermal transport structure as set forth in claim 5, wherein:

the covering layer is further provided at at least part of an outer peripheral edge of each of the graphite composite sheets.

7. The thermal transport structure as set forth in claim 5, wherein:

in the thermally conductive portion, a non-bonding layer is provided between the graphite composite sheets.

10. The thermal transport structure as set forth in claim 1, wherein:

the bonding layer or the covering layer has a thickness of not less than 0.1 μ

m and not more than 20 μ

m.

11. The thermal transport structure as set forth in claim 7, wherein:

the non-bonding layer has a thickness of not less than 0.001 μ

m and not more than 20 μ

m.

13. The thermal transport structure as set forth in claim 1, further comprising:

a protective layer provided at at least part of an outer surface of the thermal transport structure.

15. The thermal transport structure as set forth in claim 1, further comprising:

a flat plate provided on at least one side of any one or more of the fixing portions,

the each fixing portion and the flat plate having through holes, respectively, and

the each fixing portion and the flat plate being fixed by a bolt inserted through the through holes such that the graphite sheets or the graphite composite sheets are kept in a state in which the graphite sheets or the graphite composite sheets are in contact with each other.

8-9. -9. (canceled)

12. (canceled)

14. (canceled)

16. A method for producing a thermal transport structure including at least two graphite sheets or at least two graphite composite sheets each including a graphite sheet and a covering layer, the covering layer covering at least part of (i) a surface and (ii) an edge of the graphite sheet, the at least two graphite sheets or the at least two graphite composite sheets being stacked on top of each other as layers,

the method comprising the step of:

forming a fixing portion in which the graphite sheets or the graphite composite sheets are kept in a state in which the graphite sheets or the graphite composite sheets are in contact with each other or bonded to each other, the fixing portion being formed in a multilayer body in which the at least two graphite sheets or the at least two graphite composite sheets are stacked on top of each other as layers.

24. The method as set forth in claim 16, wherein:

in the step of preparing each of the graphite composite sheets, the covering layer is formed so as to cover at least part of an outer peripheral edge of the graphite sheet, in addition to covering all over the both surfaces of the graphite sheet.

25. The method as set forth in claim 16, wherein:

the bonding layer or the covering layer exhibits adhesiveness in response to application of heat and pressure; and

in the step of bonding, the graphite sheets or the graphite composite sheets are bonded to each other at one time by application of heat and pressure.

26. The method as set forth in claim 16 wherein:

the bonding layer or the covering layer has an adhesion force of not more than 1 N/25 mm at 25°

C.

17-23. -23. (canceled)

27. A thermal transport structure comprising:

at least two fixing portions; and

a thermally conductive portion between the fixing portions,

the thermal transport structure having a resilience against bending of not more than 40 N/cm in a case where a distance between the fixing portions is shortened and the thermally conductive portion is compressed by 10% in length,

the fixing portions and the thermally conductive portion being provided with at least two thermally conductive sheets, and

the thermally conductive sheets each being a graphite sheet or a graphite composite sheet obtained by covering, by a covering layer, at least part of (i) a surface and (ii) an edge of the graphite sheet.

28. The thermal transport structure as set forth in claim 27, wherein:

the graphite sheet has a thermal conductivity in a plane direction of not less than 500 W/k K

31. The thermal transport structure as set forth in claim 27, wherein:

in each of the fixing portions, the thermally conductive sheets are kept in a state in which the thermally conductive sheets are bonded to each other via a bonding layer which contains at least one of a thermosetting resin, a thermoplastic resin, and a sticky resin.

32. The thermal transport structure as set forth in claim 27, wherein:

the covering layer contains at least one of a thermosetting resin, a thermoplastic resin, and a sticky resin; and

in each of the fixing portions, the covering layer is subjected to thermal curing or thermal welding, or made adhesive, so that the thermally conductive sheets are kept in a state in which the thermally conductive sheets are bonded to each other.

34. The thermal transport structure as set forth in claim 27, further comprising:

a flat plate provided on at least one side of any one or more of the fixing portions,

the each fixing portion and the flat plate having through holes, respectively, and

the each fixing portion and the flat plate being fixed by a bolt inserted through the through holes such that the thermally conductive sheets are kept in a state in which the thermally conductive sheets are in contact with each other.

35. The thermal transport structure as set forth in claim 27, wherein:

in each of the fixing portions, the thermally conductive sheets are kept in a state in which the thermally conductive sheets are in contact with each other or bonded to each other; and

in the thermally conductive portion, the thermally conductive sheets are at least partially out of contact with each other or at least partially not bonded to each other.

29-30. -30. (canceled)

33. (canceled)