CN104057653A - Graphite membrane/metal composite cooling fin and preparation method thereof - Google Patents
Graphite membrane/metal composite cooling fin and preparation method thereof Download PDFInfo
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- CN104057653A CN104057653A CN201410260880.6A CN201410260880A CN104057653A CN 104057653 A CN104057653 A CN 104057653A CN 201410260880 A CN201410260880 A CN 201410260880A CN 104057653 A CN104057653 A CN 104057653A
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Abstract
The invention discloses a graphite membrane/metal composite cooling fin and a preparation method thereof. The graphite membrane/metal composite cooling fin disclosed by the invention is compounded of a high heat-conducting graphite membrane coating, a heat-conducting adhesive layer and a metal layer through a rewinder, achieves high heat conductivity and high tensile strength, has extremely high heat conduction coefficient in three-dimensional directions, can reduce the temperature of the heat source of an electronic device by fast conducting heat concentrated on one point to a composite heat-conducting sheet, has the advantages of good flexibility, machinability, EMI (Electro Magnetic Interference) shielding and absorption characteristic, simple preparation process and low cost and is suitable for industrial production.
Description
Technical field
The present invention relates to heat sink material field, relate to a kind of graphite film/Copper Foil heat sink compound and preparation method thereof.
Background technology
Along with developing rapidly of microelectronics integrated technology and high density PCB package technique, packing density improves rapidly, and electronic component, thousands of times of ground of logic circuit volume dwindle, and electronic instrument and equipment are day by day towards light, thin, short, little future development.Under high-frequency work frequency, semiconductor working heat environment moves rapidly to high temperature direction, now, heat run-up, increase that electronic devices and components produce, at environment for use temperature, electronic devices and components still can normally be worked on high reliability ground, and heat-sinking capability becomes the critical limitation in its service life factor that affects in time.For ensureing components and parts operational reliability, need to use the material of the excellent combination properties such as high reliability, high thermal conductivity, the heat in time heater element being gathered rapidly, passes to heat dissipation equipment, ensure that electronic equipment normally moves, in prior art, mostly adopt metal fin and graphite heat radiation fin, although the thermal conductivity factor of metal fin own is high, but interfacial property is very poor, while contact with thermal source, there is very large thermal contact resistance, can not well heat be delivered to metal from thermal source, thus impact heat radiation.And graphite heat radiation fin is very low at longitudinal thermal conductivity factor, and its interfacial property is also poor, can not well heat be transmitted out from thermal source, and therefore metal/graphite heat sink compound is the direction of urgently studying at present.
Summary of the invention
The object of the invention is, in order to overcome the deficiency of existing technology, provide a kind of graphite film/metal compound heat dispersion sheet and preparation method thereof, there is high-termal conductivity and radiation efficiency and excellent hot strength.
Technical solution of the present invention is to be composited by graphite rete, heat-conducting glue adhensive layer and metal plate layer.First adopting high molecular film material is raw material, first puts into carbide furnace and carries out carbonization, then put into graphitizing furnace and carry out graphitization, makes high conductive graphite film; Again high conductive graphite film is rolled, and apply one deck heat conduction gluing layer in one side; The another side that finally metal plate layer is attached to heat conduction gluing layer, carries out composite molding by rewinding machine.
Concrete technology step is as follows:
1) select high molecular film material as raw material, intersect stackingly, be positioned in carbide furnace and be warming up to carburizing temperature, carry out carbonization, then material complete carbonization is moved in graphitizing furnace and carry out graphitization, take out calendering and make graphite film;
2) by weight, add 40～80 parts of ethyl acrylates, 5～15 parts of acrylic acid, 1～5 part of initator in reactor, 100～150 revs/min of stir speed (S.S.)s, in 3～6 hours reaction time, prepare heat conduction adhesive;
3) heat conduction adhesive is coated in uniformly to a side of the graphite film having rolled, then sheet metal is attached to this side, finally carry out compound graphite film/metal compound heat dispersion sheet for preparing by rewinding machine.
Described high molecular film material is the wherein one in polyimides, polyamide, polybenzoxazole, poly-benzo-dioxazole, polythiazole etc., and then preferred polyimides, and its thickness is 15 μ m～120 μ m.
Described heat conduction adhesive, comprises the component formula of following weight ratio: 40～80 parts of ethyl acrylates, 5～15 parts of acrylic acid, 1～5 part of initator.
Carburizing temperature is 900～1450 DEG C, and carbonization time is 5～16h.
Graphitization temperature is 2500～3000 DEG C, is preferably 2900 DEG C; Graphitization time is 5～16h, is preferably 14h.
The viscosity of ethyl acrylate is 0.63～2 mPas; Acrylic acid viscosity is between 1.2～5mPas.
Initator is the one in azo-bis-isobutyl cyanide or DCP.
Sheet metal is the one in Copper Foil or aluminium foil, and thickness is between 0.01～0.05mm.
The advantage that the present invention compared with prior art possessed is, combines the advantage of carbon materials and metal material, and horizontal and vertical direction all has excellent heat conductivility, and has higher tensile strength, simple for process.
Detailed description of the invention
Below the preferred embodiments of the present invention are described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention are made to more explicit defining.
Embodiment 1
First select polyimides as raw material, polyimides thickness is 15 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 40 parts of ethyl acrylates, 5 parts of acrylic acid, 1 part of initator, 100 revs/min of stir speed (S.S.)s, 3 hours reaction time, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then Copper Foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 4.2MPa, thermal conductivity factor (horizontal direction): 1860W/mk, thermal conductivity factor (vertical direction): 260W/mk.
Embodiment 2
First select polyimides as raw material, polyimides thickness is 30 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 50 parts of ethyl acrylates, 6 parts of acrylic acid, 1.5 parts of initators, 120 revs/min of stir speed (S.S.)s, 4 hours reaction time, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then Copper Foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 4.4MPa, thermal conductivity factor (horizontal direction): 1760W/mk, thermal conductivity factor (vertical direction): 240W/mk.
Embodiment 3
First select polyimides as raw material, polyimides thickness is 50 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 70 parts of ethyl acrylates, 10 parts of acrylic acid, 2 parts of initators, 130 revs/min of stir speed (S.S.)s, 5 hours reaction time, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then Copper Foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 4.8MPa, thermal conductivity factor (horizontal direction): 1890W/mk, thermal conductivity factor (vertical direction): 270W/mk.
Embodiment 4
First select polyimides as raw material, polyimides thickness is 80 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 70 parts of ethyl acrylates, 8 parts of acrylic acid, 3 parts of initators, 150 revs/min of stir speed (S.S.)s, reaction time is 6 hours, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then aluminium foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 4.9MPa, thermal conductivity factor (horizontal direction): 1810W/mk, thermal conductivity factor (vertical direction): 250W/mk.。
Embodiment 5
First select polyimides as raw material, polyimides thickness is 100 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 80 parts of ethyl acrylates, 10 parts of acrylic acid, 5 parts of initators, 150 revs/min of stir speed (S.S.)s, 5 hours reaction time, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then aluminium foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 5.1MPa, thermal conductivity factor (horizontal direction): 1868W/mk, thermal conductivity factor (vertical direction): 269W/mk.
Embodiment 6
First select polyimides as raw material, polyimides thickness is 120 μ m, intersects stacking and is positioned in graphite boat.Carbide furnace is first vacuumized, the graphite boat that fills raw material is put into carbide furnace and carry out carbonization, be warming up to 1400 DEG C and need 7h.Then material complete carbonization is moved in graphitizing furnace, and material is exerted pressure, under argon gas atmosphere, carry out graphitization, be warming up to 2900 DEG C and need 14h.Take out product, obtain artificial conductive graphite film finished product, be positioned in calender and roll, take out for subsequent use.Then in reactor, add 80 parts of ethyl acrylates, 15 parts of acrylic acid, 5 parts of initators, 150 revs/min of stir speed (S.S.)s, 6 hours reaction time, prepare heat conduction adhesive, be coated in uniformly the one-sided of the graphite film that rolled, then aluminium foil is attached to this side, finally carry out the compound heat sink compound for preparing by rewinding machine, hot strength: 5.2MPa, thermal conductivity factor (horizontal direction): 1866W/mk, thermal conductivity factor (vertical direction): 278W/mk.
Claims (9)
1. graphite film/metal compound heat dispersion sheet, is characterized in that: be composited by graphite rete, heat-conducting glue adhensive layer and metal plate layer; First adopting high molecular film material is raw material, first puts into carbide furnace and carries out carbonization, then put into graphitizing furnace and carry out graphitization, makes high conductive graphite film; Again high conductive graphite film is rolled, and apply one deck heat conduction gluing layer in one side; The another side that finally metal plate layer is attached to heat conduction gluing layer, carries out composite molding by rewinding machine.
2. a kind of graphite film/metal compound heat dispersion sheet as claimed in claim 1, is characterized in that, described heat conduction adhesive comprises the component formula of following weight ratio: 40～80 parts of ethyl acrylates, 5～15 parts of acrylic acid, 1～5 part of initator.
3. a preparation method for graphite film/metal compound heat dispersion sheet, is characterized in that: concrete technology step is as follows:
1) select high molecular film material as raw material, intersect stackingly, be positioned in carbide furnace and be warming up to carburizing temperature, carry out carbonization, then material complete carbonization is moved in graphitizing furnace and carry out graphitization, take out calendering and make graphite film;
2) by weight, add 40～80 parts of ethyl acrylates, 5～15 parts of acrylic acid, 1～5 part of initator in reactor, 100～150 revs/min of stir speed (S.S.)s, in 3～6 hours reaction time, prepare heat conduction adhesive;
3) heat conduction adhesive is coated in uniformly to a side of the graphite film having rolled, then sheet metal is attached to this side, finally carry out compound graphite film/metal compound heat dispersion sheet for preparing by rewinding machine.
4. a kind of graphite film/metal compound heat dispersion sheet as described in claim 1 or 3 and preparation method thereof, it is characterized in that, described high molecular film material is the wherein one in polyimides, polyamide, polybenzoxazole, poly-benzo-dioxazole, polythiazole etc., and then preferred polyimides, its thickness is 15 μ m～120 μ m.
5. the preparation method of a kind of graphite film/metal compound heat dispersion sheet as claimed in claim 3, is characterized in that: the carburizing temperature described in step 1) is 900～1450 DEG C, and carbonization time is 5～16h.
6. the preparation method of a kind of graphite film/metal compound heat dispersion sheet as claimed in claim 3, is characterized in that: in step 1), graphitization temperature is 2500～3000 DEG C, is preferably 2900 DEG C; Graphitization time is 5～16h, is preferably 14h.
7. the preparation method of a kind of graphite film/metal compound heat dispersion sheet as claimed in claim 3, is characterized in that: step 2) in the viscosity of ethyl acrylate be 0.63～2 mPas; Acrylic acid viscosity is between 1.2～5mPas.
8. the preparation method of a kind of graphite film/metal compound heat dispersion sheet as claimed in claim 3, is characterized in that: step 2) in initator be the one in azo-bis-isobutyl cyanide or DCP.
9. a kind of graphite film/metal compound heat dispersion sheet as described in claim 1 or 3 and preparation method thereof, is characterized in that: sheet metal is the one in Copper Foil or aluminium foil, and thickness is between 0.01～0.05mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105818475A (en) * | 2016-03-11 | 2016-08-03 | 奇华光电（昆山）股份有限公司 | Graphite, metal foil, and foam buffer composite cooling fin |
| CN106784504A (en) * | 2017-02-24 | 2017-05-31 | 南通鼎鑫电池有限公司 | A kind of lithium ion battery with high efficiency heat radiation |
| CN106847767A (en) * | 2017-02-22 | 2017-06-13 | 东莞市鸿亿导热材料有限公司 | A kind of graphite Copper Foil heat sink compound |
| CN107458062A (en) * | 2017-08-22 | 2017-12-12 | 江苏泛亚微透科技股份有限公司 | Carbon thermally conductive sheet and expanded PTFE heat insulating coat film and preparation method thereof |
| CN107538842A (en) * | 2017-05-19 | 2018-01-05 | 上海叹止新材料科技有限公司 | Compound film of a kind of energy storage radiating and preparation method thereof |
| CN107809885A (en) * | 2017-10-10 | 2018-03-16 | 重庆云天化瀚恩新材料开发有限公司 | A kind of graphite film metallic composite of high-bond and preparation method thereof |
| CN109133966A (en) * | 2018-09-10 | 2019-01-04 | 哈尔滨工业大学 | A kind of preparation method of layered gradient graphite film/aluminium composite material |
| CN110340368A (en) * | 2019-08-02 | 2019-10-18 | 中国科学院山西煤炭化学研究所 | A kind of preparation method of high performance graphite film Cu-base composites |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105818475A (en) * | 2016-03-11 | 2016-08-03 | 奇华光电（昆山）股份有限公司 | Graphite, metal foil, and foam buffer composite cooling fin |
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| CN109133966A (en) * | 2018-09-10 | 2019-01-04 | 哈尔滨工业大学 | A kind of preparation method of layered gradient graphite film/aluminium composite material |
| CN109133966B (en) * | 2018-09-10 | 2021-02-09 | 哈尔滨工业大学 | Preparation method of layered gradient graphite film/aluminum composite material |
| CN110340368A (en) * | 2019-08-02 | 2019-10-18 | 中国科学院山西煤炭化学研究所 | A kind of preparation method of high performance graphite film Cu-base composites |
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Application publication date: 20140924 |