Graphite composite film

Patent metadata

Field	Value
Publication number	US-9500418-B2
Application number	US-201314372343-A
Country	US
Kind code	B2
Filing date	Jan 11, 2013
Priority date	Jan 16, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

There is provided a graphite composite film including a graphite film and a metal layer formed on a surface of the graphite film, in which peeling-off of the metal layer from the graphite film is suppressed. More specifically, the graphite composite film includes a graphite film and a metal layer formed on at least one side of the graphite film, wherein the graphite film has a plurality of through holes formed therein, a metal layer is formed also inside the through holes so as to be connected to the metal layer formed on a surface of the graphite film, the metal layer inside the through holes is formed continuously from the one side to an opposite side of the graphite film, and a distance between outer diameters of the through holes is 0.6 mm or less and a ratio of an area of metal inside the through holes to an area of the graphite composite film is 1.4% or more.

First claim

The invention claimed is:

1. A graphite composite film comprising a graphite film and a metal layer formed on at least one side of the graphite film, wherein
the graphite film has a plurality of through holes formed therein, the through holes having a distance between outer diameters of the through holes of 0.6 mm or less,
a metal layer is formed also inside the through holes so as to be connected to the metal layer formed on a surface of the graphite film, the metal layer inside the through holes is formed continuously from the one side to an opposite side of the graphite film,
a ratio of an area of metal inside the through holes to an area of the graphite composite film is 1.4% or more, so that peeling-off of the metal layer from the graphite film is suppressed,
the graphite composite film exhibits grade A, B, or C in an evaluation test of soldering heat resistance, when the graphite composite film is immersed in a solder bath at 260° C. for 10 seconds, and
wherein said grade A represents that a distance from an end of delamination between the metal layer and the graphite film is 0.20 mm or less, said grade B represents that a distance from an end of delamination between the metal layer and the graphite film is 0.21 mm to 0.40 mm, and said grade C represents that a distance from an end of delamination between the metal layer and the graphite film is 0.41 mm to 0.60 mm.

2. The graphite composite film according to claim 1 , wherein the metal layer on the surface of the graphite film is formed by plating.

3. The graphite composite film according to claim 1 , wherein the graphite film has a hole area ratio of 1.4% or more but 40.0% or less.

4. The graphite composite film according to claim 1 , wherein the through holes have a diameter of 0.90 mm or less.

5. The graphite composite film according to claim 1 , further comprising a solder layer formed on a surface of the metal layer formed on the surface of the graphite film.

6. A method for producing a graphite composite film, comprising the step of forming a metal layer on at least one side of a graphite film having a plurality of through holes formed therein, the through holes having a distance between outer diameters of the through holes of 0.6 mm or less, and inside the through holes to obtain a graphite composite film, wherein a ratio of an area of metal inside the through holes to an area of the graphite composite film is 1.4% or more, wherein
the graphite composite film exhibits grade A, B, or C in an evaluation test of soldering heat resistance, when the graphite composite film is immersed in a solder bath at 260° C. for 10 seconds, and
wherein said grade A represents that a distance from an end of delamination between the metal layer and the graphite film is 0.20 mm or less, said grade B represents that a distance from an end of delamination between the metal layer and the graphite film is 0.21 mm to 0.40 mm, and said grade C represents that a distance from an end of delamination between the metal layer and the graphite film is 0.41 mm to 0.60 mm.

7. The production method according to claim 6 , further comprising the step of forming through holes in a polymer film or a carbonized film as a raw material film and then graphitizing the raw material film by heat treatment to obtain the graphite film having a plurality of through holes formed therein.

8. The production method according to claim 6 , further comprising the step of directly forming through holes in a graphite film with a drill or laser to obtain the graphite film having a plurality of through holes formed therein.

9. The graphite composite film according to claim 2 , wherein the graphite film has a hole area ratio of 1.4% or more but 40.0% or less.

10. The graphite composite film according to claim 2 , wherein the through holes have a diameter of 0.90 mm or less.

11. The graphite composite film according to claim 3 , wherein the through holes have a diameter of 0.90 mm or less.

12. The graphite composite film according to claim 2 , further comprising a solder layer formed on a surface of the metal layer formed on the surface of the graphite film.

13. The graphite composite film according to claim 3 , further comprising a solder layer formed on a surface of the metal layer formed on the surface of the graphite film.

14. The graphite composite film according to claim 4 , further comprising a solder layer formed on a surface of the metal layer formed on the surface of the graphite film.

15. The graphite composite film according to claim 1 , wherein the graphite film is a graphite film obtained by subjecting a polymer film to heat treatment.

16. The production method according to claim 6 , wherein the graphite film is a graphite film obtained by subjecting a polymer film to heat treatment.

17. The graphite composite film according to claim 1 , wherein the graphite composite film exhibits said grade A or B.

18. The production method according to claim 6 , wherein the graphite composite film exhibits said grade A or B.

Assignees

• Kaneka Corp

Inventors

• Kutsumizu Makoto
• Nishikawa Yasushi
• Ohta Yusuke
• Katayama Satoshi
• Inada Takashi
• Inada Takashi

Classifications

• C04B41/5111

  Ag, Au, Pd, Pt or Cu · CPC title

• C04B41/88 Primary

  Metals · CPC title

• C04B35/62218

  obtaining ceramic films, e.g. by using temporary supports · CPC title

• C04B35/522

  Graphite (C04B35/536 takes precedence) · CPC title

• Y10T428/24339

  Keyed · CPC title