CN104787753A - Graphite paper and its making method - Google Patents
Graphite paper and its making method Download PDFInfo
- Publication number
- CN104787753A CN104787753A CN201510011187.XA CN201510011187A CN104787753A CN 104787753 A CN104787753 A CN 104787753A CN 201510011187 A CN201510011187 A CN 201510011187A CN 104787753 A CN104787753 A CN 104787753A
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- CN
- China
- Prior art keywords
- graphite
- graphite paper
- quasiflake
- paper
- manufacture method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 110
- 239000010439 graphite Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 229910021382 natural graphite Inorganic materials 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 4
- 230000023556 desulfurization Effects 0.000 claims abstract description 4
- 239000012634 fragment Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000013517 stratification Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 10
- 241001282153 Scopelogadus mizolepis Species 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
- Paper (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention discloses graphite paper and a manufacturing method thereof. The method for manufacturing the graphite paper comprises the steps of firstly carrying out expansion reaction on scale-shaped natural graphite to obtain vermicular graphite, then carrying out desulfurization reaction on the vermicular graphite, then crushing the desulfurized vermicular graphite to form fragment-state vermicular graphite, and finally pressing the fragment-state vermicular graphite to obtain the graphite paper with thin thickness and flat and compact surface.
Description
Technical field
The present invention relates to a kind of thermally conductive material and manufacture method thereof, especially relate to a kind of graphite paper and manufacture method thereof.
Background technology
Under the development of science and technology and the demand trend of consumption market, electronic product is constantly toward high performance, high speedization and compact future development.This makes the density of electronic component relatively increase, but because electronic component can produce a large amount of heat energy in time operating, therefore electronic product how is made can to possess good radiating efficiency under limited component size, to guarantee the normal operation of electronic product, and then extend the work-ing life of product, " heat radiation " just becomes the key issue that electronic product now primarily overcomes.
Typically use the metal heat sink that the thermal conductivity such as copper, aluminium is high at present, the heat energy produced when being operated by electronic component is derived by surface, but compare with copper, aluminium, graphite has more low thermal resistance, lightweight, and the performance advantage of the more high uniqueness of heat-conduction coefficient, therefore graphite has been regarded as having the good heat conductive material solving electronic product radiating problem now.
In graphite flake heat sink material, natural graphite is that cost of manufacture is lower, and an also comparatively widely used class.The production method of current natural graphite flakes heat sink material after heating volumetric expansion hundreds of times, becomes so-called low-density quasiflake graphite by flaky graphite, and the compacting immediately that continues forms the graphite flake of tabular.But under such production method, because the bending and torsional property that quasiflake graphite has, cause the surface of natural graphite flakes heat sink material or even inside to have larger hole, therefore bulk strength is lower.Moreover, for maintaining the fundamental strength of natural graphite flakes, to bear external impacts, the thickness of natural graphite flakes often needs to maintain a specific thicker state, therefore cannot meet gradually electronic component under lightening trend development time, only surplus narrow heat sink material configuration space demand.
In view of this, the present invention is directed to the disappearance of above-mentioned prior art, propose a kind of brand-new graphite paper and manufacture method thereof, effectively to overcome above-mentioned problem.
Summary of the invention
Main purpose of the present invention is to provide a kind of graphite paper and manufacture method thereof, and the graphite paper obtained by it has thinner thickness, the smooth and fine and close advantage higher with hardness in surface concurrently.
Another object of the present invention is to provide a kind of graphite paper and manufacture method thereof, and the graphite paper obtained by it can be installed in the narrow remaining space of electronic package, reaches good heat radiation comparatively fruit.
In order to reach above-mentioned each object and effect, present invention is disclosed a kind of manufacture method of graphite paper, its step includes first carries out expansion reaction by flake natural graphite, to obtain quasiflake graphite.Subsequently, quasiflake graphite is carried out desulphurization reaction.Continue, the quasiflake graphite after desulfurization is pulverized, form fragment state quasiflake graphite.Finally, fragment state quasiflake graphite is pressed into graphite paper.
The present invention more discloses a kind of graphite paper utilized obtained by above-mentioned manufacture method, and wherein the thickness of this graphite paper is 10 ~ 170 microns, and heat-conduction coefficient is 300 ~ 500W/m-K.
The present invention also teach a kind of graphite paper, and it forms by fragment state quasiflake graphite is repressed, and this graphite paper surface undulation value scope the best is 0.6 ~ 0.8 micron, and density range the best of this graphite paper is 1.8 ~ 2.1g/cm
3, secondary good 1.5 ~ 1.7g/cm
3, be minimumly not less than 1.2g/cm
3, the mean diameter of hole is 0.5 micron, and the cross section of this graphite paper presents a point stratiform graphite flake.
Accompanying drawing explanation
Fig. 1 is the schema of a preferred embodiment of the present invention;
Fig. 2 a is existing natural graphite flakes heat sink material SEM sectional view (photo);
Fig. 2 b is existing natural graphite flakes heat sink material SEM exterior view (photo);
Fig. 2 c is graphite paper SEM sectional view (photo) of the present invention;
Fig. 2 d is graphite paper SEM exterior view (photo) of the present invention.
Embodiment
For making your juror have a better understanding and awareness feature of the present invention and effect of reaching, careful assistant is with preferred embodiment and coordinate detailed description, illustrates as rear:
The invention provides a kind of graphite paper and manufacture method thereof, natural graphite flakes intensity is now low to solve, thickness is thicker high with surface undulation degree, and the problem of current electronic component demand trend cannot be met.Method detailed step is as follows:
Refer to Fig. 1, it is the schema of a preferred embodiment of the present invention.As shown in the figure, the manufacture method of graphite paper of the present invention comprises following steps:
Step S10: flake natural graphite is carried out 300 ~ 500 DEG C of high-temperature expansion reactions, to obtain quasiflake graphite, now the mean length of quasiflake graphite is 3 ~ 8mm.
Step S12: this quasiflake graphite is carried out desulphurization reaction, the service temperature of this desulphurization reaction is higher than the expansion reaction of step S10, and temperature range is 800 ~ 1000 DEG C.
Step S14: pulverized in ethanolic soln by the quasiflake graphite after this desulfurization, form fragment state quasiflake graphite, now the mean length of quasiflake graphite is 0.3 ~ 1mm.
Step S16: this fragment state quasiflake graphite is crossed water stratification, to remove high specific gravity impurity, the impurity of indication can be the metals such as vanadium, titanium, iron, aluminium, calcium, boron herein, or transition-metals and their oxides and graphene oxide etc.The embodiment crossing water stratification is that the impurity that proportion is higher can be deposited in bottom by loose for fragment state quasiflake graphite bubbling through the water column.
Step S18: sieved with 10 ~ 30 eye mesh screens by the fragment state quasiflake graphite of removal high specific gravity impurity and drain further, it utilizes centrifuge to carry out centrifuge dehydration about 1 ~ 5 minute with rotating speed per minute 60 ~ 150 turns.
Step S20: be placed in baking oven for heating drying, drying temperature is 100 ~ 200 DEG C.And this dried shred quasiflake graphite is carried out grain size screening, to remove the shred quasiflake graphite of mistake small particle size not removed under moisture state further.
Step S22: last, the shred quasiflake graphite of the grain size needed for selection is pressed into graphite paper, and make the thickness of graphite paper according to required heat conduction demand.The thickness range of graphite paper of the present invention is 10 ~ 170 microns, and thermal conductivity values is 300 ~ 500W/m-K.And the pressure range of pressing process is 50 ~ 200Kg/cm
2.
Mode of the present invention makes it present shred by crushing process big scale quasiflake graphite, namely script big scale quasiflake graphite is cut off as small scale, reduce the bending degree with reversing that every single big scale quasiflake graphite has thus, make can present tight joint between the shred quasiflake graphite after pressing process, higher density can be had, and then make graphite paper can have required intensity under thinner thickness.Moreover because quasiflake graphite of the present invention is the shred presenting small scale, the state of graphite linings interbed and interlayer is also more remarkable, can be considered just like the sheet structure of mica.Graphite paper density range the best obtained by the present invention is 1.8 ~ 2.1g/cm
3, secondary good 1.5 ~ 1.7g/cm
3, be minimumly not less than 1.2g/cm
3.
In addition, because reduce the degree of the bending and torsion that quasiflake graphite has, the graphite paper surface therefore obtained by the present invention is comparatively smooth careful.Existing natural graphite paper surface roughness (surface undulation) is 0.8 ~ 1.2 micron, graphite paper surface roughness of the present invention is 0.6 ~ 0.8 micron, and the mean diameter of graphite paper surface hole defect of the present invention is 0.5 micron, cross section presents a point stratiform graphite flake.
See also Fig. 2 a to Fig. 2 d, it is sequentially existing natural graphite flakes heat sink material SEM cross sectional photograph, existing natural graphite flakes heat sink material SEM surface picture, graphite paper SEM cross sectional photograph of the present invention and graphite paper SEM surface picture of the present invention.
Can find that the part graphite linings of natural graphite flakes heat sink material exists with the direction of near vertical graphite flake by those SEM cross sectional photograph, this is because use big scale quasiflake graphite when being pressed into sheet, because multiple bending is entangled with mutually with torsion, therefore laminate structure cannot be presented.Reviewing graphite paper of the present invention is use the quasiflake graphite of small scale therefore obviously can present laminate structure.
Can find that natural graphite flakes heat sink material graphite paper more of the present invention crystal grain is larger by those SEM surface picture, surface is even inner has larger hole, and graphite paper surface presentation of the present invention is more smooth careful.
In sum, graphite paper of the present invention and manufacture method thereof can prepare thinner thickness, surface undulation degree is little and careful, and the graphite paper that hardness is higher, can be installed in narrow electronic package remaining space during application, reach good heat radiation comparatively fruit.
The foregoing is only the preferred embodiments of the present invention, be not used for limiting scope of the invention process, the equalization of such as doing according to the shape described in the claims in the present invention, structure, feature and spirit changes and modifies, and all should be included in protection scope of the present invention.
Claims (10)
1. a manufacture method for graphite paper, it includes the following step:
Step S1: flake natural graphite is carried out expansion reaction, to obtain quasiflake graphite;
Step S2: this quasiflake graphite is carried out desulphurization reaction;
Step S3: pulverized by the quasiflake graphite after this desulfurization, forms fragment state quasiflake graphite; And
Step S4: this fragment state quasiflake graphite is pressed into graphite paper.
2. the manufacture method of graphite paper as claimed in claim 1, wherein between this step S3 and this step S4, also includes a cleaning-drying and particle diameter screens step.
3. the manufacture method of graphite paper as claimed in claim 2, wherein this cleaning-drying and particle diameter screen step and include:
This fragment state quasiflake graphite is crossed water stratification, to remove high specific gravity impurity;
The fragment state quasiflake graphite of this removal high specific gravity impurity is sieved and drains dehydration;
The shred quasiflake graphite this sieved after draining dehydration carries out cryodrying; And
This dried shred quasiflake graphite is carried out particle diameter screening.
4. the manufacture method of graphite paper as claimed in claim 1, wherein this step S3 carries out in an ethanolic soln.
5. the manufacture method of graphite paper as claimed in claim 1, wherein the temperature of this step S2 is higher than the temperature of step S1.
6. with the graphite paper obtained by the manufacture method of graphite paper according to claim 1, wherein the thickness of this graphite paper is 10 ~ 170 microns, and heat-conduction coefficient is 300 ~ 500W/m-K.
7. a graphite paper, to be that the fragment state quasiflake graphite of 0.3 ~ 1mm is repressed by mean length form for it, and this graphite paper surfaceness is less than 0.8 micron, and the cross section of this graphite paper presents a point stratiform graphite flake.
8. graphite paper, wherein the density range 1.2g/cm of this graphite paper as claimed in claim 7
3above, the mean diameter of hole is 0.5 micron.
9. graphite paper as claimed in claim 8, wherein the density range of this graphite paper is between 1.2g/cm
3to 2.1g/cm
3between.
10. graphite paper as claimed in claim 7, wherein the thickness of this graphite paper is 10 ~ 170 microns, and heat-conduction coefficient is 300 ~ 500W/m-K.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103102374 | 2014-01-22 | ||
| TW103102374A TWI528014B (en) | 2014-01-22 | 2014-01-22 | Graphite paper and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104787753A true CN104787753A (en) | 2015-07-22 |
Family
ID=53553008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510011187.XA Pending CN104787753A (en) | 2014-01-22 | 2015-01-09 | Graphite paper and its making method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104787753A (en) |
| TW (1) | TWI528014B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540572A (en) * | 2016-01-20 | 2016-05-04 | 宜昌华邦石墨有限公司 | Gas-material separation device |
| CN110757869A (en) * | 2019-11-05 | 2020-02-07 | 肖云凯 | Heat-conducting graphite paper preparation equipment and method using Kish graphite as raw material |
| CN112873680A (en) * | 2020-12-30 | 2021-06-01 | 鸡西市普晨石墨有限责任公司 | Preparation method of flexible graphite paper |
| CN114853475A (en) * | 2022-05-18 | 2022-08-05 | 昌邑市高端密封材料有限公司 | Graphite paper forming process |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437952B (en) * | 2018-11-30 | 2020-09-15 | 大同新成新材料股份有限公司 | Method for preparing graphite paper from CC composite material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503626B1 (en) * | 2000-02-25 | 2003-01-07 | Graftech Inc. | Graphite-based heat sink |
| CN1569972A (en) * | 2004-04-28 | 2005-01-26 | 杨久新 | Environmental protection type flexible graphite packing for recovery |
| CN102175089A (en) * | 2011-01-07 | 2011-09-07 | 肖云凯 | Ultrathin graphite paper radiating fin and manufacturing method thereof |
| CN102887665A (en) * | 2012-08-16 | 2013-01-23 | 中科恒达石墨股份有限公司 | Novel graphite powder and radiator made of novel graphite powder |
-
2014
- 2014-01-22 TW TW103102374A patent/TWI528014B/en active
-
2015
- 2015-01-09 CN CN201510011187.XA patent/CN104787753A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503626B1 (en) * | 2000-02-25 | 2003-01-07 | Graftech Inc. | Graphite-based heat sink |
| CN1569972A (en) * | 2004-04-28 | 2005-01-26 | 杨久新 | Environmental protection type flexible graphite packing for recovery |
| CN102175089A (en) * | 2011-01-07 | 2011-09-07 | 肖云凯 | Ultrathin graphite paper radiating fin and manufacturing method thereof |
| CN102887665A (en) * | 2012-08-16 | 2013-01-23 | 中科恒达石墨股份有限公司 | Novel graphite powder and radiator made of novel graphite powder |
Non-Patent Citations (1)
| Title |
|---|
| 况金华等: "《陶瓷生产工艺技术》", 31 May 2013 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540572A (en) * | 2016-01-20 | 2016-05-04 | 宜昌华邦石墨有限公司 | Gas-material separation device |
| CN110757869A (en) * | 2019-11-05 | 2020-02-07 | 肖云凯 | Heat-conducting graphite paper preparation equipment and method using Kish graphite as raw material |
| CN110757869B (en) * | 2019-11-05 | 2021-08-13 | 肖云凯 | Heat-conducting graphite paper preparation equipment and method using Kish graphite as raw material |
| CN112873680A (en) * | 2020-12-30 | 2021-06-01 | 鸡西市普晨石墨有限责任公司 | Preparation method of flexible graphite paper |
| CN112873680B (en) * | 2020-12-30 | 2022-03-04 | 鸡西市普晨石墨有限责任公司 | Preparation method of flexible graphite paper |
| CN114853475A (en) * | 2022-05-18 | 2022-08-05 | 昌邑市高端密封材料有限公司 | Graphite paper forming process |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI528014B (en) | 2016-04-01 |
| TW201530080A (en) | 2015-08-01 |
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Application publication date: 20150722 |