CN106167415A - A kind of preparation method of high thermal conductivity flexible graphite film - Google Patents
A kind of preparation method of high thermal conductivity flexible graphite film Download PDFInfo
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- CN106167415A CN106167415A CN201610546417.7A CN201610546417A CN106167415A CN 106167415 A CN106167415 A CN 106167415A CN 201610546417 A CN201610546417 A CN 201610546417A CN 106167415 A CN106167415 A CN 106167415A
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- Prior art keywords
- graphite
- fibre
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- film
- acidifying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62218—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic films, e.g. by using temporary supports
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The preparation method of a kind of high thermal conductivity flexible graphite film, is to use mesophase pitch graphite fibre to be reinforcing agent to strengthen expanded graphite.Graphite fibre mix with acidifying graphite after at high temperature puffing, in puffing process, graphite fibre is overlapped on the chien shih reinforced effects of expanded graphite worm and is effectively improved.Made flexible graphite film hot strength ＞ 15MPa, thickness is 10 30 microns, and heat conductivity is at 400 650W/m.K.
Description
Technical field
The present invention relates to the preparation method of a kind of high thermal conductivity flexible graphite film.Specifically, it is to use mesophase pitch
The method of the high thermal conductivity flexible graphite film that the expanded graphite that graphite fibre strengthens is made.
Technical background
Graphite is to be elementary cell by the six-membered ring structure of carbon atom, and these carbon hexatomic rings are piled up with layer structure and formed,
This layer structure makes graphite have the highest capacity of heat transmission in face.In recent years, the thermal conductive property of graphite is more come by people
More paying attention to, the preparation of the highest conductive graphite becomes focus.
The production method of graphite has a variety of, and the binding agent as traditional adds aggregate, through techniques such as molding, roasting, graphitizations
Make.Graphite goods can also be made by expanded graphite.This is owing to expanded graphite is through intercalation, expansion by native graphite
A kind of expanded graphite formed, is also called expanded graphite worm.This expanded graphite is by the thing of multilamellar carbon six-membered ring structure
Matter, can make thin film or block graphite under pressure.The thin film being made up of expanded graphite is referred to as flexible graphite film.
The combination of flexible graphite film be by expanded graphite between engagement force combine, common industrialization product has flexible graphite plate
And flexible graphite film.Wherein, flexible graphite film has higher heat conductivility.Such as patent (application number
201310539573.7), in " preparation method of a kind of high thermal conductivity natural flexible graphite film ", use and natural flake graphite is inserted
Layer, method expanded, roll-in make flexible graphite film, and prepared density of film is: 1.0-1.6g/cm3, hot strength is
7-12MPa, heat conductivity 300-620W/m.K.But the intensity of the flexible graphite film prepared by expanded graphite merely is the highest, gives
Actual application causes certain difficulty.For this shortcoming, " a kind of heat conducting fiber strengthens patent (application number 201210194049.6)
The preparation method of high thermal conductivity graphite radiating fins " use by graphite fibre, carbon fiber cloth or carbon fiber as reinforcing agent, use binding agent
This graphite heat conducting heat sink and this reinforcing agent are carried out spraying laminating, makes the high thermal conductivity graphite radiating fins that heat conducting fiber strengthens.
But due to the addition of reinforcing agent, particularly binding agent, reduce the overall thermal conductivity of graphite film.At patent (application number
201410383261.6) in " the high thermal conductivity graphite radiating fins of a kind of heat conducting fiber enhancing and preparation method ", by graphite powder and stone
Ink fiber mixing, expanded in high temperature furnace after certain way processes, it is then pressed into high thermal conductivity graphite radiating fins.Graphite fibre
Play a part enhancing.But in this patent, reinforcing agent graphite fibre also experiences early stage process, and its intensity is remarkably decreased, reinforced effects
The best.So, high thermal conductivity graphite radiating fins (thin film) combination property could be improved.
The present invention be directed to the shortcoming that flexible graphite film intensity is low, use graphite fibre that flexible graphite film is strengthened,
The mode that is wherein mixed into graphite fibre improves to reach to improve the thin film strength of high conductive graphite.
Summary of the invention
The present invention relates to a kind of method that graphite fibre strengthens flexible graphite film, uses graphite fibre and acidifying graphite
The techniques such as mixing, high temperature puffing, calendering make the graphite film that intensity is high.Graphite fibre is uniform in acidifying graphite puffing process
Being dispersed in expanded graphite, graphite fibre is overlapped between different expanded graphite cluster (anthelmintic), will during calendering formation
Different expanded graphite groups connect, and make overall flexibility graphite film intensity effectively improve.
The principle of above-mentioned enhancing is as follows: flexible graphite film is strengthened by graphite fibre as reinforcing agent, and whole material is stone
Ink fiber and the composite of expanded graphite.Expanded graphite is the bulked structure formed by its raw material natural graphite powder body, by stone
Crystal in powdered ink body is the expanded graphite cluster of unit, also becomes expanded graphite worm.Conventional simple by expanded graphite
In the flexible graphite film of preparation, different expanded graphite groups is dependent on the engagement of graphite flake layer (at impressed pressure, such as calendering)
Combining, there is interface between them, its bonding state is to determine flexible graphite film intensity.Improve these interfaces
Bond strength can improve the macro strength of whole flexible graphite film.Orientation ten sub-argument of carbon hexatomic ring in graphite fibre
Think so that it is the highest in the intensity of length direction, graphite fibre is overlapped between expanded graphite cluster, interface cohesion can be made to obtain
To significantly improving.Acidifying graphite is rapid expanding in hot environment, self has melange effect, by uniform for the graphite fibre of periphery
It is distributed in expanded graphite.The flexible graphite film intensity that such mixture is made is effectively improved.
Concrete preparation process is as follows:
(1) natural graphite powder taking granularity 30-100 mesh uses conventional method to make acidifying graphite；
(2) being mixed with the graphite fibre of 1-3mm by acidifying graphite, mixed proportion is acidifying graphite: graphite fibre=100:
(0.5-2)；
(3) expanded graphite is made by expanded at 800-1200 DEG C for said mixture；
(4) expanded graphite is made flexible graphite film through calendering.
The preparation of the acidifying graphite described in above-mentioned steps (1) refers to chemical graft process, is with sulphuric acid, nitric acid, Strong oxdiative
The method that agent etc. process.
Graphite fibre described in above-mentioned steps (2) is the high conductive graphite fiber with mesophase pitch as raw material.
Made flexible graphite film hot strength ＞ 15MPa, thickness is 10-30 micron, and heat conductivity is at 400-
650W/m.K。
Advantages of the present invention:
Graphite fibre is overlapped between expanded graphite cluster (anthelmintic) as reinforcing agent, effectively enhances soft graphite thin
Film.
Detailed description of the invention:
Embodiment 1
The native graphite of 30 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100: 2
Ratio mixing, the wherein a length of 1.0mm of graphite fibre；Mixture expanded is made graphite fibre and expanded graphite at 800 DEG C
Mixture；This mixture is made flexible graphite film through calendering.Thickness 12.7 μm of this thin film, hot strength is
16.1MPa, heat conductivity 491W/m.K.
Embodiment 2
The native graphite of 30 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100:
The ratio mixing of 1.5, the wherein a length of 2.1mm of graphite fibre；Mixture expanded is made graphite fibre and expanded stone at 800 DEG C
The mixture of ink；This mixture is made flexible graphite film through calendering.Thickness 14.9 μm of this thin film, hot strength is
17.2MPa, heat conductivity 510W/m.K.
Embodiment 3
The native graphite of 30 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100:
The ratio mixing of 1.5, the wherein a length of 2.95mm of graphite fibre；By mixture at 800 DEG C of expanded graphite fibres and expanded made
The mixture of graphite；This mixture is made flexible graphite film through calendering.Thickness 21.6 μm of this thin film, hot strength is
15.3MPa, heat conductivity 452W/m.K.
Embodiment 4
The native graphite of 50 mesh is processed through conventional method and makes acidifying graphite；Acidifying graphite: graphite fibre=100: 1
Ratio mixes, the wherein a length of 1.0mm of graphite fibre；By mixture at 1000 DEG C of expanded graphite fibre and expanded graphites made
Mixture；This mixture is made flexible graphite film through calendering.Thickness 11.2 μm of this thin film, hot strength is 19.1MPa,
Heat conductivity 630W/m.K.
Embodiment 5
The native graphite of 50 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100: 1
Ratio mixing, the wherein a length of 2.1mm of graphite fibre；Mixture expanded is made graphite fibre and expanded graphite at 1000 DEG C
Mixture；This mixture is made flexible graphite film through calendering.Thickness 10.3 μm of this thin film, hot strength is
16.9MPa, heat conductivity 649W/m.K.
Embodiment 6
The native graphite of 50 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100: 1
Ratio mixing, the wherein a length of 2.95mm of graphite fibre；Mixture expanded is made graphite fibre and expanded stone at 1000 DEG C
The mixture of ink；This mixture is made flexible graphite film through calendering.Thickness 12.1 μm of this thin film, hot strength is
17.1MPa, heat conductivity 572W/m.K.
Embodiment 7
The native graphite of 100 mesh is processed through conventional method and makes acidifying graphite；With acidifying graphite: graphite fibre=100:
The ratio mixing of 0.5, the wherein a length of 2.1mm of graphite fibre；By mixture at 1200 DEG C of expanded graphite fibres and expanded made
The mixture of graphite；This mixture is made flexible graphite film through calendering.Thickness 29.8 μm of this thin film, hot strength is
15.1MPa, heat conductivity 403W/m.K.
Claims (5)
1. a preparation method for high thermal conductivity flexible graphite film, is characterized in that using graphite fibre is that reinforcing agent is to expanded graphite
Strengthening, graphite fibre is overlapped on the chien shih reinforced effects of expanded graphite worm and is effectively improved.
2. the preparation method of the high thermal conductivity flexible graphite film described in claim 1, its detailed process is as follows: take granularity 30-100
Purpose natural graphite powder uses conventional method to make acidifying graphite；The graphite fibre of acidifying graphite with 1-3mm length is mixed, mixing
Ratio is acidifying graphite: graphite fibre=100: (0.5-2)；Expansion stone is made by expanded at 800-1200 DEG C for said mixture
Ink；Expanded graphite is made flexible graphite film through calendering.
3. the graphite fibre described in claim 1 is the high conductive graphite fiber with mesophase pitch as raw material.
4. the preparation of the acidifying graphite described in claim 2 refers to chemical graft process, is with sulphuric acid, nitric acid, strong oxidizer etc.
The method processed.
5. the flexible graphite film hot strength ＞ 15MPa made by, thickness is 10-30 micron, and heat conductivity is at 400-650W/
m.K。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546417.7A CN106167415A (en) | 2016-07-08 | 2016-07-08 | A kind of preparation method of high thermal conductivity flexible graphite film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546417.7A CN106167415A (en) | 2016-07-08 | 2016-07-08 | A kind of preparation method of high thermal conductivity flexible graphite film |
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| Publication Number | Publication Date |
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| CN106167415A true CN106167415A (en) | 2016-11-30 |
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| CN201610546417.7A Pending CN106167415A (en) | 2016-07-08 | 2016-07-08 | A kind of preparation method of high thermal conductivity flexible graphite film |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539111A (en) * | 2013-11-05 | 2014-01-29 | 中国科学院山西煤炭化学研究所 | Preparation method of high thermal conductivity natural flexible graphite film |
| CN104144597A (en) * | 2012-12-11 | 2014-11-12 | 天诺光电材料股份有限公司 | Heat-conduction-fiber-enhanced high heat conductivity graphite cooling fin and manufacturing method |
| CN105088420A (en) * | 2015-09-14 | 2015-11-25 | 陕西天策新材料科技有限公司 | Preparation method for high-heat-conduction asphalt graphite fibers |
-
2016
- 2016-07-08 CN CN201610546417.7A patent/CN106167415A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144597A (en) * | 2012-12-11 | 2014-11-12 | 天诺光电材料股份有限公司 | Heat-conduction-fiber-enhanced high heat conductivity graphite cooling fin and manufacturing method |
| CN103539111A (en) * | 2013-11-05 | 2014-01-29 | 中国科学院山西煤炭化学研究所 | Preparation method of high thermal conductivity natural flexible graphite film |
| CN105088420A (en) * | 2015-09-14 | 2015-11-25 | 陕西天策新材料科技有限公司 | Preparation method for high-heat-conduction asphalt graphite fibers |
Non-Patent Citations (2)
| Title |
|---|
| 魏兴海等: "HClO4-GIC的制备及其柔性石墨的性能", 《新型炭材料》 * |
| 魏兴海等: "一种制备膨胀石墨的新方法及其压制品的性能研究", 《材料工程》 * |
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Application publication date: 20161130 |