CN211363749U - Composite radiating fin based on artificial graphite - Google Patents
Composite radiating fin based on artificial graphite Download PDFInfo
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- CN211363749U CN211363749U CN201922199820.9U CN201922199820U CN211363749U CN 211363749 U CN211363749 U CN 211363749U CN 201922199820 U CN201922199820 U CN 201922199820U CN 211363749 U CN211363749 U CN 211363749U
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- artificial graphite
- copper foil
- polyimide film
- adhesive layer
- heat
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Abstract
The utility model belongs to the technical field of the fin, especially, relate to a composite heat dissipation fin based on artificial graphite, including the artificial graphite preforming, wrap up in the copper foil on artificial graphite preforming surface and through calendering molding technique compound in the netted polyimide film on copper foil surface, the copper foil with still be provided with the heat-conducting adhesive layer between the artificial graphite preforming, the heat-conducting adhesive layer is provided with the bleeder vent. Compared with the prior art, the utility model discloses the radiating effect is good, resistant folding property is good and artifical graphite is difficult for droing.
Description
Technical Field
The utility model belongs to the technical field of the fin, especially, relate to a composite cooling fin based on artificial graphite.
Background
With the development of large-scale integrated circuits and packaging technologies, electronic components and electronic equipment are developed in the directions of thinness, lightness and smallness, the integration level of electronic products is higher and higher, the number of electronic components in a unit area is increased in geometric series, and heat dissipation becomes a very prominent problem. Therefore, how to dissipate heat becomes a bottleneck in miniaturization and integration of electronic products.
At present, part of products in the market conduct heat conduction and heat dissipation through metal materials (copper, aluminum and the like) and/or graphene materials. Among them, copper has a thermal conductivity of 398W/mK, but its application is limited by the disadvantages of heavy weight and easy oxidation. The thermal conductivity of the graphene material is about 4000W/mK, which is 5 times of that of copper, but the graphene material has poor folding resistance, and can be easily torn or fall off due to displacement of an adhered part. It follows that the thermal conductivity of the above materials is still limited by the physical shape of the material itself and cannot be further improved.
In view of the above, it is necessary to provide a new heat sink to solve the above technical drawbacks.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the composite radiating fin based on the artificial graphite is provided, and has the advantages of good radiating effect, good folding endurance and difficulty in falling off manually.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the composite radiating fin based on the artificial graphite comprises an artificial graphite pressing sheet, a copper foil wrapping the surface of the artificial graphite pressing sheet and a reticular polyimide film compounded on the surface of the copper foil through a calendaring molding technology, wherein a heat-conducting adhesive layer is further arranged between the copper foil and the artificial graphite pressing sheet, and air holes are formed in the heat-conducting adhesive layer.
As an improvement of the composite radiating fin based on the artificial graphite, the porosity of the reticular polyimide film is 45-75%. Too high porosity of the reticulated polyimide film affects the mechanical strength of the polyimide film, while too low porosity affects the bond strength between the reticulated polyimide film and the copper foil.
As an improvement of the composite radiating fin based on the artificial graphite, the mesh aperture of the reticular polyimide film is 0.005-1 mm. Too large mesh aperture of the reticular polyimide film can lead the polyimide film and the copper foil not to be tightly combined, and too small mesh aperture can lead the binding force of the polyimide film and the copper foil to be insufficient.
As an improvement of the composite radiating fin based on the artificial graphite, the mesh shape of the reticular polyimide film is circular, oval or polygonal.
As an improvement of the composite radiating fin based on the artificial graphite, the porosity of the heat-conducting adhesive layer is 30-80%. Too small porosity of the heat-conducting adhesive layer can obstruct heat conduction, and too large porosity of the heat-conducting adhesive layer can influence the bonding effect and the bonding strength.
As an improvement of the composite radiating fin based on the artificial graphite, the aperture of the air hole is 0.01-0.1 mm. The too small aperture of the air holes can not play the role of heat dissipation and ventilation, and the too large aperture of the air holes can reduce the strength of the heat-conducting adhesive layer.
As an improvement of the composite radiating fin based on the artificial graphite, the thickness of the artificial graphite pressing sheet is 0.01-0.2 mm. The thickness of artifical graphite preforming is too thin can not play good radiating effect, and the thickness of artifical graphite preforming then can increase the thickness of whole compound fin, influences the use of compound graphite flake in miniaturized equipment.
As an improvement of the composite heat sink based on the artificial graphite, the thickness of the copper foil is 0.001-0.1 mm. The excessive thickness of the copper foil can reduce the heat dissipation efficiency of the composite heat sink.
As an improvement of the composite heat radiating fin based on the artificial graphite, the thickness of the heat conducting glue layer is 0.001-0.1 mm. The heat dissipation efficiency of the composite heat dissipation sheet is reduced due to the fact that the thickness of the heat conduction adhesive layer is too thick.
As an improvement of the composite radiating fin based on the artificial graphite, the thickness of the reticular polyimide film is 0.001-0.1 mm. Too thick a mesh polyimide film can reduce the heat dissipation efficiency of the composite heat sink.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1) the utility model discloses an what the main part adopted is artifical graphite preforming, and its heat conductivity is natural graphite's 3 ~ 5 times, and it is easily processed simultaneously to have by the outstanding characteristic of the quick radiating of the level of point to face, the heat conductivity that can improve current fin existence comparatively effectively is subject to the physical shape of material itself and the problem that can't further improve.
2) The utility model discloses a copper foil cladding is in the surface of artifical graphite preforming, and the copper foil is the material that heat conductivility is better, can not cause too big influence to composite cooling fin's whole radiating effect with its surface of wrapping up in artifical graphite preforming, and the copper foil can wrap up artifical graphite preforming in it in addition, can not have the phenomenon of tearing and droing.
3) The heat-conducting adhesive layer with the air holes is arranged between the copper foil and the artificial graphite pressing sheet, on one hand, the copper foil and the artificial graphite pressing sheet can be combined more compactly, and the overall strength of the composite radiating fin is improved; on the other hand, the heat-conducting adhesive layer is also provided with air holes, and the influence on the heat dissipation performance of the composite heat sink can be reduced as much as possible.
4) The outermost layer of the utility model is compounded with the reticular polyimide film, firstly, the polyimide has good heat-conducting property, and the heat-radiating effect of the composite radiating fin can not be influenced; secondly, the polyimide film can prevent the copper foil from being exposed in the air and prevent the copper foil from being oxidized; finally, the polyimide film has higher mechanical strength and tensile fracture value, and the addition of the polyimide film can effectively improve the problem of poor folding resistance of the composite heat radiating fin, thereby further solving the problem that the artificial graphite is easy to fall off.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the middle heat-conducting adhesive layer of the present invention.
FIG. 3 is a schematic structural diagram of a reticular polyimide film according to the present invention.
Wherein: 1-artificial graphite pressing sheet, 2-heat conducting glue layer, 3-copper foil, 4-reticular polyimide film, 21-air holes and 41-mesh.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
As shown in fig. 1 to 3, a composite heat sink based on artificial graphite comprises an artificial graphite sheet 1, a copper foil 3 wrapped on the surface of the artificial graphite sheet 1, and a reticular polyimide film 4 compounded on the surface of the copper foil 3 by a calendaring technology, wherein a heat conductive adhesive layer 2 is further arranged between the copper foil 3 and the artificial graphite sheet 1, and the heat conductive adhesive layer 2 is provided with air holes 21.
Preferably, the porosity of the reticular polyimide film 4 is 45-75%. Too high a porosity of the net-shaped polyimide film 4 affects the mechanical strength of the polyimide film 4, and too low a porosity affects the bonding strength between the net-shaped polyimide film 4 and the copper foil 3.
Preferably, the mesh 41 of the reticular polyimide film 4 has a pore diameter of 0.005 to 1 mm. Too large mesh openings 41 of the mesh-shaped polyimide film 4 may prevent the polyimide film 4 from being tightly combined with the copper foil 3, and too small mesh openings 41 may result in insufficient bonding force between the polyimide film 4 and the copper foil 3.
Preferably, the mesh 41 of the reticular polyimide film 4 has a circular, elliptical or polygonal shape.
Preferably, the porosity of the heat-conducting adhesive layer 2 is 30-80%. Too small porosity of the heat-conducting adhesive layer 2 can obstruct heat conduction, and too large porosity of the heat-conducting adhesive layer 2 can influence the bonding effect and the bonding strength.
Preferably, the aperture of the air holes 21 is 0.01-0.1 mm. The too small aperture of the air holes 21 can not play the role of heat dissipation and ventilation, and the too large aperture of the air holes 21 can reduce the strength of the heat-conducting adhesive layer.
Preferably, the thickness of the artificial graphite tablet 1 is 0.01-0.2 mm. The thickness of artifical graphite preforming 1 is thin can not play good radiating effect, and the thickness of artifical graphite preforming 1 is thick then can increase the thickness of whole compound fin, influences the use of compound graphite flake in miniaturized equipment.
Preferably, the thickness of the copper foil 3 is 0.001 to 0.1 mm. The excessive thickness of the copper foil 3 may reduce the heat dissipation efficiency of the composite heat sink.
Preferably, the thickness of the heat-conducting adhesive layer 2 is 0.001-0.1 mm. The heat dissipation efficiency of the composite heat sink is reduced by the excessively thick thickness of the heat conductive adhesive layer 2.
Preferably, the thickness of the reticular polyimide film 4 is 0.001-0.1 mm. Too thick a mesh polyimide film 4 may reduce the heat dissipation efficiency of the composite heat sink.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The utility model provides a composite cooling fin based on artificial graphite which characterized in that: the artificial graphite pressing sheet comprises an artificial graphite pressing sheet, a copper foil wrapping the surface of the artificial graphite pressing sheet and a reticular polyimide film compounded on the surface of the copper foil through a calendaring molding technology, wherein a heat-conducting adhesive layer is further arranged between the copper foil and the artificial graphite pressing sheet, and the heat-conducting adhesive layer is provided with air holes.
2. The artificial graphite-based composite heat sink of claim 1, wherein: the porosity of the reticular polyimide film is 45-75%.
3. The artificial graphite-based composite heat sink of claim 1, wherein: the mesh aperture of the reticular polyimide film is 0.005-1 mm.
4. The artificial graphite-based composite heat sink of claim 1, wherein: the mesh shape of the reticular polyimide film is circular, oval or polygonal.
5. The artificial graphite-based composite heat sink of claim 1, wherein: the porosity of the heat-conducting adhesive layer is 30-80%.
6. The artificial graphite-based composite heat sink of claim 1, wherein: the aperture of the air holes is 0.01-0.1 mm.
7. The artificial graphite-based composite heat sink of claim 1, wherein: the thickness of the artificial graphite tablet is 0.01-0.2 mm.
8. The artificial graphite-based composite heat sink of claim 1, wherein: the thickness of the copper foil is 0.001-0.1 mm.
9. The artificial graphite-based composite heat sink of claim 1, wherein: the thickness of the heat-conducting adhesive layer is 0.001-0.1 mm.
10. The artificial graphite-based composite heat sink of claim 1, wherein: the thickness of the reticular polyimide film is 0.001-0.1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922199820.9U CN211363749U (en) | 2019-12-10 | 2019-12-10 | Composite radiating fin based on artificial graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922199820.9U CN211363749U (en) | 2019-12-10 | 2019-12-10 | Composite radiating fin based on artificial graphite |
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| Publication Number | Publication Date |
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| CN211363749U true CN211363749U (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922199820.9U Active CN211363749U (en) | 2019-12-10 | 2019-12-10 | Composite radiating fin based on artificial graphite |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112662333A (en) * | 2020-12-28 | 2021-04-16 | 新昌县辰逸服饰有限公司 | Graphene heat conduction and dissipation film |
| CN115521726A (en) * | 2022-10-21 | 2022-12-27 | 广东顶峰精密技术有限公司 | Graphite flake heat dissipation sticker and production process thereof |
-
2019
- 2019-12-10 CN CN201922199820.9U patent/CN211363749U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112662333A (en) * | 2020-12-28 | 2021-04-16 | 新昌县辰逸服饰有限公司 | Graphene heat conduction and dissipation film |
| CN115521726A (en) * | 2022-10-21 | 2022-12-27 | 广东顶峰精密技术有限公司 | Graphite flake heat dissipation sticker and production process thereof |
| CN115521726B (en) * | 2022-10-21 | 2023-07-14 | 广东顶峰精密技术有限公司 | Graphite flake heat dissipation paste and production process thereof |
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