KR101855281B1 - Heat-dissipation sheet and preparation method thereof - Google Patents
Heat-dissipation sheet and preparation method thereof Download PDFInfo
- Publication number
- KR101855281B1 KR101855281B1 KR1020150181289A KR20150181289A KR101855281B1 KR 101855281 B1 KR101855281 B1 KR 101855281B1 KR 1020150181289 A KR1020150181289 A KR 1020150181289A KR 20150181289 A KR20150181289 A KR 20150181289A KR 101855281 B1 KR101855281 B1 KR 101855281B1
- Authority
- KR
- South Korea
- Prior art keywords
- graphite
- sheet
- fibers
- heat
- graphite sheet
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
- H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
- H05K7/20472—Sheet interfaces
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/23—Oxidation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
- H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
- H05K7/20472—Sheet interfaces
- H05K7/20481—Sheet interfaces characterised by the material composition exhibiting specific thermal properties
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/32—Thermal properties
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Laminated Bodies (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
Abstract
The present invention relates to a heat-radiating sheet and a method of manufacturing the heat-radiating sheet, and the heat-radiating sheet of the present invention is excellent in horizontal and vertical thermal conductivity and can be utilized in various fields where heat radiation is required.
Description
The present invention relates to a heat-radiating sheet and a method of manufacturing the same, and more particularly, to a heat-radiating sheet having excellent horizontal and vertical thermal conductivity and a method of manufacturing the same.
Recently, electronic devices are required to emit heat due to increase in heat density due to light weight, small size, multifunction and high integration, and heat emission is important because it is closely related to the reliability and life of the device. Various heat-dissipating materials have been developed accordingly, and commercially available heat-radiating pads, heat-radiating sheets, and heat-radiating paints have been supplementing or replacing existing heat-radiating fans, heat-radiating fins, and heat pipes.
Among them, the heat-radiating sheet is manufactured in the form of a graphite sheet, a polymer-ceramic composite sheet, a multilayered coating metal thin film sheet, etc. In the case of a graphite sheet, lightweight, slim and thermal conductivity is extremely high, And a PDP constituting a plasma television or the like.
There is a method called "expanded graphite method" in the conventional method of producing a graphite sheet. In this method, graphite is prepared by immersing natural graphite in a mixture of concentrated sulfuric acid and concentrated acetic acid, followed by rapid heating. The graphite thus produced is processed into a film shape by a high-pressure press after the acid is removed by washing. However, the graphite sheet produced as described above has a weak strength, does not have excellent physical properties, and has a problem that the influence of residual acid is concerned.
In order to solve such problems, a method has been developed in which a special polymer film is directly heat treated to graphitize (hereinafter referred to as "polymer graphitization method"). Examples of the special polymer film include polyoxadiazole, polyimide, polyphenylene vinylene, polybenzoimidazole, polybenzoxazole, polythiazole and polyamide film. The polymer graphitization method is characterized in that the manufacturing process is simple, there are no residual impurities such as acid, and excellent thermal conductivity or electrical conductivity similar to that of monocrystalline graphite is obtained as compared with the conventional expanded graphite method (JP 60-181129 Japanese Unexamined Patent Publication No. 7-109171 and Japanese Unexamined Patent Publication No. 61-275116).
Further, a method of mixing an additive such as carbon nanotubes with a polymer film in order to improve mechanical properties in a polymer graphitization method is known (see Japanese Patent No. 5275721).
However, in the case of the polymer graphitization method, it has been difficult to obtain a thick film-like graphite in comparison with the expanded graphite method.
Furthermore, the conventional graphite sheet has a disadvantage in that the heat spreading factor (thermal conductivity) in the horizontal direction is high, but the heat spreading factor in the vertical direction is low and the cost is high.
Therefore, an object of the present invention is to provide a heat-radiating sheet excellent in horizontal and vertical thermal conductivity and a method of manufacturing the same.
In order to achieve the above object, the present invention provides a graphite sheet comprising an inner layer comprising graphitized fibers and a graphite outer layer, and having at least two through-holes; And a metal coating layer formed on one or both surfaces of the graphite sheet while filling the through holes.
The present invention also relates to a method for producing a laminate, comprising the steps of: (1) coating a base material comprising natural fibers, man-made fibers or paper with a coating liquid containing at least one of a polymer, a carbonized polymer and graphite; (2) carbonizing and graphitizing the coated substrate by heat treatment to produce a graphite sheet; And (3) coating the graphite sheet with a metal on one or both surfaces thereof after the graphite sheet is bored.
The heat-radiating sheet of the present invention is superior in heat conductivity in the horizontal and vertical directions as compared with the conventional graphite sheet and is economical by using a comparatively inexpensive fiber base material instead of the expensive polyimide film used in the conventional polymer graphite method.
Figures 1 and 2 are top views of graphite sheets having through holes according to one embodiment of the present invention.
3 is a side view of a heat-radiating sheet according to an embodiment of the present invention.
4 is a schematic view showing a rolling process among the coating methods that can be used in step (1) of the heat radiation sheet producing method of the present invention.
The heat-radiating sheet of the present invention comprises a graphite sheet having an inner layer containing graphitized fibers and a graphite outer layer and having at least two through-holes; And a metal coating layer formed on one or both surfaces of the graphite sheet while filling the through holes.
The graphitized fiber may be natural fiber, artificial fiber or paper which is carbonized and graphitized. The natural fiber may be a cellulose fiber, a protein fiber, or a mineral fiber. Further, the man-made fiber may be an organic fiber or an inorganic fiber.
Further, the inner layer may consist of a fiber bundle comprising a plurality of graphitized fibers, or may be in the form of a woven fabric of weft and warp, consisting of graphitized or graphitized fiber bundles.
The graphite outer layer includes a first graphite outer layer laminated on one side of the inner layer and a second graphite outer layer laminated on the other side of the inner layer, and a part of the first graphite outer layer and the second graphite outer layer may be connected to each other.
The through-hole may have an average diameter of 2 mm or less, 0.8 mm or less, or 0.5 mm or less. The minimum distance between the outer diameters of the through holes may be 10 mm or less, 8 mm or less, or 5 mm or less. For example, the through-holes may have a minimum distance between an average diameter of 0.5 to 2 mm and an outside diameter of 4 to 10 mm.
Further, the total area of the through holes may be 1 to 50%, 1 to 40% or 1 to 20% of the total area of the graphite sheet. When the average diameter of the through holes, the minimum distance between the outer diameters, and the total area satisfy the above ranges, there is an effect that the vertical thermal distribution becomes uniform.
The graphite sheet may have an average thickness of 0.02 to 1.3 mm or 0.025 to 1 mm.
The graphite sheet according to an embodiment of the present invention may be a
The metal coating layer may be formed on one or both surfaces of the graphite sheet and may include at least one metal selected from the group consisting of copper, nickel, gold, silver, tin, chromium, palladium and aluminum.
The metal coating layer may have an average thickness of 0.005 to 0.1 mm or 0.005 to 0.05 mm.
The heat radiation sheet of the present invention may have a thermal diffusivity of 1 to 50 mm 2 / sec in the vertical direction and a thermal diffusivity of 400 to 1,800 mm 2 / sec in the horizontal direction.
The heat-radiating sheet may have an average thickness of 0.025 to 1.5 mm or 0.03 to 1.2 mm.
3 is a side cross-sectional view of a heat-radiating
The present invention also relates to a method for producing a laminate, comprising the steps of: (1) coating a base material comprising natural fibers, man-made fibers or paper with a coating liquid containing at least one of a polymer, a carbonized polymer and graphite; (2) carbonizing and graphitizing the coated substrate by heat treatment to produce a graphite sheet; And (3) coating the graphite sheet with a metal on one or both surfaces thereof after the graphite sheet is bored.
Step (1)
First, in step (1), one side or both sides of a substrate including natural fiber, artificial fiber or paper is coated with a coating liquid containing at least one of polymer, carbonized polymer and graphite.
The natural fiber may be a cellulose fiber, a protein fiber, or a mineral fiber. Specifically, the cellulosic fibers include seed fibers such as cotton or kapok; Staple fibers such as jute, hemp, jute and the like; Fruit fibers such as coconut fiber; And leaf fibers such as Manila hemp, Abaca, Saijala, and the like. The protein fibers may also be wool fibers; Silk fiber; And hair fibers. When the base material constituting the graphite sheet according to the present invention is made of natural fibers, the natural fibers may be at least one natural fiber selected from the group consisting of cotton, hemp, wool and silk.
The man-made fiber may be an organic fiber or an inorganic fiber. Specifically, the organic fibers include regenerated fibers including cellulosic fibers such as rayon, tencel (lyocell), modal and the like, and protein-based fibers; Semisynthetic fibers including cellulosic fibers such as acetate, triacetate and the like; And synthetic fibers such as polyamide fibers, polyester fibers, polyurethane fibers, polyethylene fibers, polyvinyl chloride fibers, polyfluoroethylene fibers, polyvinyl alcohol fibers, acrylic fibers and polypropylene fibers can do. In the case where the base material constituting the graphite sheet according to the present invention is made of a synthetic fiber, the synthetic fiber is made of nylon, polyester, polyurethane, polyethylene, polyvinyl chloride, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene At least one synthetic fiber selected from the group consisting of: Or at least one cellulosic fiber selected from the group consisting of rayon, acetate, and triacetate.
The coating liquid may include at least one of a polymer, a carbonized polymer, and graphite.
The polymer may include at least one member selected from the group consisting of polyimide, polyamic acid, polyvinyl chloride, polyester, polyurethane, polyethylene, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene. Specifically, the polymer is a polymer having a weight average molecular weight of 200,000 to 300,000 selected from the group consisting of polyimide, polyamic acid, polyvinyl chloride, polyester, polyurethane, polyethylene, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene It can be more than a species. More specifically, the polymer may be polyimide, polyamic acid or polyvinyl chloride having a weight average molecular weight of about 250,000.
In the case of using the polyamic acid as the polymer, the step of imidization may be performed at 380 to 420 ° C for 0.5 to 4 hours before (2) (i.e., between (1) and (2)).
The coating is not particularly limited as long as it is a method usually used for forming a coating layer. For example, a rolling process, a bar coating process, a dip coating process, a spray coating process, or the like can be used. Specifically, a rolling process or a bar coating process can be used. When a liquid polyamic acid having a high viscosity is used as a coating liquid, it is preferable to use a rolling process to effectively coat the substrate. FIG. 4 is a schematic view showing a rolling process among the coating methods that can be used in step (1) of the method of the present invention. The coating liquid is coated on one surface of the
In addition, the coating may be repeated once or several times to form a coating layer having a desired thickness. Specifically, the coating layer may have an average thickness of 20 to 500 탆.
Step (2)
Next, in step (2), the coated substrate is heat treated by carbonization and graphitization to produce a graphite sheet.
The heat treatment is not particularly limited as long as it is a process condition that can be carried out to carbonize and graphitize the polymer and / or the fiber. For example, the heat treatment may be carried out at 700 to 1,800 ° C for 1 to 20 hours and at a temperature of 2,000 to 3,200 ° C Lt; / RTI > for 1 to 20 hours. Specifically, the carbonization may be performed at 800 to 1,800 ° C or 1,100 to 1,400 ° C, and the graphitization may be performed at 2,500 to 3,000 ° C or 2,700 to 2,900 ° C.
Said graphite sheet comprising an inner layer comprising graphitized fibers; And a graphite outer layer, wherein the inner layer comprises a fiber bundle comprising a plurality of graphitized fibers, or may be in the form of a woven fabric of weft and warp, consisting of graphitized or graphitized fiber bundles have. The graphite outer layer includes a first graphite outer layer laminated on one side of the inner layer and a second graphite outer layer laminated on the other side of the inner layer, and a part of the first graphite outer layer and the second graphite outer layer may be connected to each other.
According to an embodiment of the present invention, it may further comprise rolling between step (2) and step (3). The rolling is not particularly limited as long as it is a usual method that can be carried out to adjust the thickness of the sheet. For example, the rolled graphite sheet may have an average thickness of 0.015 to 1.3 mm or 0.017 to 1 mm.
Step (3)
Next, in step (3), the heat-radiating sheet of the present invention is manufactured by burying the graphite sheet and then coating one or both sides thereof with a metal.
The perforation can be performed using a laser, a drill, or a perforation punch.
The perforated graphite sheet as described above may include through holes having the average diameter, the minimum distance between the outer diameters and the total area as described above.
The metal may be the same as the metal contained in the metal coating layer as described above.
The metal coating is not particularly limited as long as it is a method used for coating metal on the surface of a substrate. Specifically, the metal coating can be performed by electroplating, dissolving metal immersion plating, spraying spray plating, vapor deposition plating or cathodic spray plating have.
The heat-radiating sheet of the present invention thus produced is excellent in thermal conductivity in the horizontal and vertical directions as compared with the graphite sheet of the related art. By using a comparatively inexpensive fiber base material instead of the expensive polyimide film used in the conventional polymer graphitization method, It is economical.
Hereinafter, the present invention will be described in more detail with reference to the following examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
[
Example
]
Manufacturing example One.
1-1: Graphite Sheet manufacture
As a substrate, 100 plain weave cotton fabrics were used. Both sides of the substrate were coated with liquid polyimide (product name: PI Varnish (2,3-component PAA) by SKC-Kolon Co., Ltd., weight average molecular weight: 250,000 g / mol), and dried at 80 DEG C for 10 minutes, 250 DEG C for 10 minutes, and 420 DEG C for 10 minutes to form a polymer coating layer. The substrate on which the polymer coating layer was formed was heated to 1,200 占 폚 at a heating rate of 1 占 폚 / min in a nitrogen atmosphere at a pressure of 100 torr and carbonized at 1,200 占 폚 for 3 hours. The carbonized substrate was heated to 2,850 占 폚 at a heating rate of 5 占 폚 / min in a nitrogen atmosphere at a pressure of 100 torr and graphitized at 2,850 占 폚 for 1 hour to prepare a graphite sheet. The graphite sheet was rolled once at 25 占 폚 to prepare a graphite sheet having a thickness of 40 占 퐉.
1-2: Manufacture of heat-radiating sheet
The graphite sheet of Production Example 1-1 was perforated with a perforation hole having a diameter of 1 mm by orthogonal punches so that the minimum distance between the outer diameters was 5 mm. Thereafter, a 45 탆 thick heat-radiating sheet including a metal coating layer was formed on both sides by depositing copper by maintaining a vacuum degree of 1 torr or less using a sputtering apparatus.
Experimental Example . Thermal diffusivity Measure
The horizontal and vertical direction thermal diffusivities of the graphite sheet or the heat radiation sheet produced in Production Example 1 were measured using a thermal diffusivity measuring apparatus ("LFA447 Nanoflash" manufactured by Netsch Co., Ltd.) by the optical flow method. Specifically, the horizontal and vertical thermal diffusivities were measured by cutting the manufactured sheets to a size of? 25.4 mm and? 12.6 mm, respectively, at a temperature of 25 占 폚 at least five times, and representing the average value.
(Mm2 / sec)
(Mm2 / sec)
The heat radiation sheet of Production Example 1-2 had a significantly higher horizontal and vertical thermal diffusivity than the graphite sheet (Production Example 1-1) before forming the pore and metal coating layer.
100, 200, 310: Graphite sheet
110, 210: graphite outer layer
120, 220: through hole
300: heat-radiating sheet
320: metal coating layer
410: substrate
420:
430: roll press
Claims (18)
And a metal coating layer formed on one or both surfaces of the graphite sheet while filling the through holes,
Wherein the inner layer is made of graphitized fibers or graphitized fiber bundles, the weft and warp weave being in the form of a woven fabric,
The graphitized fiber is natural fiber, artificial fiber or paper, carbonized and graphitized,
Wherein a thermal diffusivity in a vertical direction is 1 to 50 mm 2 / sec and a thermal diffusivity in a horizontal direction is 400 to 1800 mm 2 / sec.
Wherein the graphite outer layer comprises a first graphite outer layer laminated on one side of the inner layer and a second graphite outer layer laminated on the other side of the inner layer, wherein a part of the first graphite outer layer and the second graphite outer layer are connected to each other.
Wherein the total area of the through holes is 1 to 50% of the total area of the graphite sheet.
Wherein the through holes have an average diameter of 2 mm or less and a minimum distance between the outer diameters of the through holes is 10 mm or less.
Wherein the metal coating layer comprises at least one metal selected from the group consisting of copper, nickel, gold, silver, tin, chromium, palladium and aluminum.
Wherein the heat radiation sheet has an average thickness of 0.025 to 1.5 mm.
The graphite sheet has an average thickness of 0.02 to 1.3 mm,
Wherein the metal coating layer has an average thickness of 0.005 to 0.1 mm.
Wherein the heat-radiating sheet includes a metal coating layer formed on both surfaces of the graphite sheet,
Wherein the metal coating layers on both sides are connected to each other through the through holes of the graphite sheet.
(2) carbonizing and graphitizing the coated substrate by heat treatment to produce a graphite sheet;
(3) coating the graphite sheet with one or both sides thereof with metal to prepare a heat-radiating sheet,
Wherein said graphite sheet comprises an inner layer comprising graphitized fibers and a graphite outer layer, said inner layer consisting of graphitized fibers or graphitized fiber bundles, said woven and warp-
Wherein the heat radiation sheet has a thermal diffusivity in a vertical direction of 1 to 50 mm 2 / sec and a thermal diffusivity in a horizontal direction of 400 to 1800 mm 2 / sec.
Wherein the polymer of step (1) comprises at least one member selected from the group consisting of polyamic acid, polyvinyl chloride, polyester, polyurethane, polyethylene, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene, Gt;
Wherein the polymer comprises a polyamic acid,
Wherein the method further comprises the step of imidizing between 380 and 420 占 폚 for 0.5 to 4 hours between steps (1) and (2).
Wherein carbonization is performed at 700 to 1,800 ° C for 1 to 20 hours and graphitization is performed at 2,000 to 3,200 ° C for 1 to 20 hours in the step (2).
Further comprising a step of rolling between the steps (2) and (3).
Wherein the punching is performed using the laser, the drill or the punching punch in the step (3).
In the step (3), the metal coating is performed by electroplating, fusing metal immersion plating, spray spray plating, vapor deposition plating or cathodic spray plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150181289A KR101855281B1 (en) | 2015-12-17 | 2015-12-17 | Heat-dissipation sheet and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150181289A KR101855281B1 (en) | 2015-12-17 | 2015-12-17 | Heat-dissipation sheet and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170072740A KR20170072740A (en) | 2017-06-27 |
| KR101855281B1 true KR101855281B1 (en) | 2018-05-08 |
Family
ID=59514598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150181289A KR101855281B1 (en) | 2015-12-17 | 2015-12-17 | Heat-dissipation sheet and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101855281B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210015240A (en) | 2019-08-01 | 2021-02-10 | 코오롱인더스트리 주식회사 | Method for preparing graphite sheet |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102012384B1 (en) * | 2017-12-27 | 2019-08-20 | 에스케이씨 주식회사 | Packaging material for battery and battery cell comprising the same |
| KR102036755B1 (en) * | 2018-01-29 | 2019-10-25 | (주)에스엠하이테크 | Manufacturing method of thermal diffusion sheet |
| KR102094925B1 (en) * | 2018-05-03 | 2020-03-30 | 에스케이씨 주식회사 | Multilayer graphite sheet having excellent electromagnetic shielding property and thermal conductivity, and preparation method thereof |
| KR102355038B1 (en) * | 2020-08-12 | 2022-02-07 | 이청윤 | Frying pan and the manufacturing method of it |
| KR102421490B1 (en) * | 2021-02-04 | 2022-07-15 | 주식회사 신성씨앤티 | Heat conduction sheet composites and method thereof |
| KR102643735B1 (en) * | 2023-05-08 | 2024-03-06 | 가드넥(주) | Graphite sheet with excellent heat dissipation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101432530B1 (en) | 2014-04-15 | 2014-08-21 | 실리콘밸리(주) | natural graphite and composite graphite stacked thermal diffusion sheet and manufacturing method thereof |
-
2015
- 2015-12-17 KR KR1020150181289A patent/KR101855281B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101432530B1 (en) | 2014-04-15 | 2014-08-21 | 실리콘밸리(주) | natural graphite and composite graphite stacked thermal diffusion sheet and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210015240A (en) | 2019-08-01 | 2021-02-10 | 코오롱인더스트리 주식회사 | Method for preparing graphite sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170072740A (en) | 2017-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101855281B1 (en) | Heat-dissipation sheet and preparation method thereof | |
| US11541634B2 (en) | Graphite sheet and method for manufacturing same | |
| CN110982114B (en) | Aramid fiber/carbon nanotube hybrid aerogel film, and preparation method and application thereof | |
| JP5749868B1 (en) | Composite material containing unidirectional continuous fiber and thermoplastic resin | |
| CN113015617B (en) | Carbon nanofiber and method for producing the same | |
| JP6972772B2 (en) | Fuel cell separator precursor and fuel cell separator | |
| US11745463B2 (en) | Multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity and manufacturing method therefor | |
| CN109923091B (en) | Method for preparing graphite flake | |
| CN105172245B (en) | Carbon fiber insulator and preparation method thereof | |
| KR102342310B1 (en) | Method for preparing graphite sheet | |
| KR101544748B1 (en) | Method for making 3d preform having high heat conductivity and method for making aircraft brake disc having the 3d preform | |
| EP3418039B1 (en) | Preparation method and preparation apparatus of carbon fiber sheet molding compound | |
| CN113292341A (en) | Preparation method of heat dissipation graphite film | |
| KR102150325B1 (en) | Method for manufacturing patterned artificial graphite heat dissipation sheet | |
| WO2013158976A1 (en) | Heat reduction sheet | |
| KR101809641B1 (en) | Method for preparing roll type graphite sheet | |
| CN114318591B (en) | Two-dimensional graphene fiber, preparation method and application | |
| KR102212191B1 (en) | Porous graphite nanofiber web, a membrane including the web structure, a heat-radiation sheet including the membrane, and a method of manufacturing the nanofiber web | |
| JP2013136856A (en) | Oil absorbing sheet and oil absorbing composite sheet | |
| JP2017197854A (en) | Carbon fiber spacer and connection method thereof | |
| CN115571877A (en) | Aramid fiber-based graphite film and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| AMND | Amendment | ||
| E601 | Decision to refuse application | ||
| AMND | Amendment | ||
| X701 | Decision to grant (after re-examination) |