CN1463039A - Structure of thermal fin with high heat conductivity and its manufacturing method - Google Patents
Structure of thermal fin with high heat conductivity and its manufacturing method Download PDFInfo
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- CN1463039A CN1463039A CN 02121735 CN02121735A CN1463039A CN 1463039 A CN1463039 A CN 1463039A CN 02121735 CN02121735 CN 02121735 CN 02121735 A CN02121735 A CN 02121735A CN 1463039 A CN1463039 A CN 1463039A
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- aluminium alloy
- radiating fin
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Abstract
Shearing strength generated by stirring breaks or destroys dendritical primary crystal in solid/liquid two phases area of aluminum alloy so as to form melted soup containing spherical solid broken pieces. Then, ceramics grains are added into the melted soup and the solid particles in the liquid phase metal are utilized to disperse the ceramics grains. Under the action of continuous stirring, the aluminum alloy is turned to small and non-branched structure, becoming the compact mixed liquor of ceramics/ aluminum alloy. Finally, the construction shape of the thermal fins is made by die-casting process. In the invention, plasticity of aluminum alloy and high heat conductivity of ceramics grains give the shape and good heat radiating effect of the thermal fins.
Description
Technical field
The present invention relates to a kind of high heat conducting heat radiating fin structure and manufacture method thereof, relate to a kind of light weight specifically and have more the heat radiating fin structure of high conduction of heat than traditional copper/aluminium alloy, and it directly can be finished the construction profile of various radiators in the die casting mode, use with the heat radiation that is applied in the contour thermal source of central processing unit.
Background technology
Press, along with the speed of central processing unit constantly improves, when power promotes thereupon, the thermal source that its central processing unit running is produced down also constantly rises, and the employed radiator of central processing unit of at present general computer, the thermal source of central processing unit is dispersed by main system by conduction of heat, so can be formed with radiating fin with proper spacing on the main body of its radiator, increase the area that contacts with air by the setting of radiating fin, and then reach the effect that thermal source is discharged, so whether good heat conduction efficiency that still depends on radiator body basically of radiating effect of radiator, to such an extent as to the employed radiator based on aluminium alloy of central processing unit of at present general computer is to be replaced by the higher copper alloy of heat conduction efficiency gradually.
Yet,,, and can't meet the more radiating requirements of high speed central processing unit because the heat conduction efficiency of its structure itself is still limited though can be processed into multiple profile with pull, the mode that extrudes by copper, aluminium alloy with the main structure body of present radiator; Especially, though the heat conduction efficiency of copper alloy heat sink is better than aluminium alloy heat radiator, the proportion of whole copper alloy heat sink is than the aluminium alloy heat radiator height, and do not meet the light-weighted demand of computer.
Summary of the invention
The object of the present invention is to provide a kind of high heat conducting heat radiating fin structure and manufacture method thereof, promptly by solid-liquid two-phase region at aluminium alloy, interrupt or smash the dendroid primary crystal of curing to stir the shear stress that is caused, formation contains the molten soup of globular solids particle, again ceramic particle is added, and utilize the solid particle that is dispersed in the liquid metal to disperse the ceramic particle that is added, under the effect that constantly imposes stirring, make aluminium alloy become trickle but not dendritic morphology, to finish the ceramic mixed liquor of compactness, last then directly finish the construction profile of fin in the die casting mode, with by moulding in order to the integral heat sink chip architecture of the characteristic of aluminium alloy, and promote the radiating effect of isomorphous structure by the high heat conduction efficiency of ceramic particle.
Another object of the present invention system is by the ceramic particle of sneaking into proper proportion in aluminium alloy, significantly reducing the weight of integral heat sink sheet, and more meets the light-weighted design requirement of computer.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of high heat conducting heat radiating fin structure is characterized in that the integral heat sink sheet is shapes of making various nearly clean shapes according to the needs of practical application, and integrally-built again main body lies in the ceramic particle of sneaking into proper proportion in the aluminium alloy.
Another feature of the present invention is that this aluminium alloy is one or more among AlSi, AlSiCu, AlSiZn, AlSiMg, AlSiCuMg, AlGe, AlGeSi, AlCu, AlMn, AlLi, AlSn and the AlPb; This ceramic particle is a carborundum, and the particle diameter of this carborundum is advisable with 40-3000 μ m, and accounts for the part by weight of integral heat sink sheet 0.5-80%.
A kind of manufacture method of high heat conducting heat radiating fin structure, its step is as follows:
1. with smelting furnace aluminium alloy is heated to more than 660 ℃, and definite aluminium alloy is entirely liquid phase state.
2. carry out slagging-off work, with the Impurity removal in the aluminium alloy.
3. adding ceramic particle reaches 0.5-80% to weight ratio.
4. with stirring rod molten soup is stirred under solid-liquid phase temperature, this moment, molten soup temperature remained on 550-700 ℃.
5. the ejaculation system of die casting equipment has been ladled out and injected to the molten soup that will stir with mechanical arm, penetrates and be shaped, and the clamp force of die casting board is 200-250ton, and the casting area pressure during ejaculation is 150-250Kg/cm
2
Advantage of the present invention is because the heat radiating fin structure that is to sneak in the aluminium alloy proper proportion ceramic particle of the present invention, can promote the radiating effect of isomorphous structure by the high heat conduction efficiency of ceramic particle, under the experimental comparison of actual sample of finishing and copper fin, the thermal conductivity of fin of the present invention is up to 485W/mK, not only the 400W/mK numerical value than the copper fin is high, and fin of the present invention adds under the content difference at ceramic particle, its coefficient of heat conduction can be between 150-485W/mK, can be applicable to pyrotoxin is more than the 85W or the central processing unit of 2.2GHz speed, and the coefficient of heat conduction of general copper fin only is 400W/mK, only can use the central processing unit that is limited to pyrotoxin 80W last; Especially, fin of the present invention adds under the content difference at ceramic particle, and density is between 2.7-3.5g/cm
3Between, compared to general copper fin 8.6g/cm
3, can reduce the weight of 1/2-2/3 approximately, and more meet the light-weighted designing requirement of notebook computer.Description of drawings Fig. 1 is a flow chart of the present invention.
Embodiment
A kind of high heat conducting heat radiating fin structure of the present invention and manufacture method thereof, the shape of various nearly clean shapes is made by its integral heat sink sheet system according to the needs of practical application, integrally-built again main body lies in the ceramic particle of sneaking into proper proportion in the aluminium alloy, with by moulding in order to the integral heat sink sheet of the characteristic of aluminium alloy, and promote the radiating effect of isomorphous structure by the high heat conduction efficiency of ceramic particle; Wherein, this aluminium alloy is for being selected from by AlSi, AlSiCu, and AlSiZn, AlSiMg, AlSiCuMg, AlGe, AlGeSi, AlCu, AlMn, AlLi, in the group that AlSn and AlPb formed, its ceramic particle then is that particle diameter is the silicon-carbide particle of 40-3000 μ m.
Moreover, the manufacturing of integral heat sink sheet is the solid-liquid two-phase region that ties up to aluminium alloy, interrupt or smash the dendroid primary crystal of curing by stirring the shear stress that is caused, formation contains the molten soup of globular solids particle, again ceramic particle is added, and utilize the solid particle that is dispersed in the liquid metal to disperse the ceramic particle that is added, under the effect that constantly imposes stirring, make aluminium alloy become trickle but not dendritic morphology, finishing the ceramic mixed liquor of compactness, last then can directly finish the construction profile of fin in the die casting mode.
Embodiment 1
Aluminium alloy adopts AlMgSi, the consisting of of this aluminium alloy:
AlMgSi alloy composition (%)
| Si | ?Fe | ?Cu | ?Mn | ?Mg | ?Cr | ?Zn | ?Al |
| 0.6 | ?0.35 | ?0.1 | ?0.1 | ?0.75 | ?0.1 | ?0.1 | ?97.9 |
Carborundum accounts for 10% weight ratio of integral heat sink sheet, and the particle diameter of carborundum is 80 μ m.Concrete grammar is as follows:
1. with smelting furnace aluminium alloy is heated to 660-720 ℃, and definite aluminium alloy is entirely liquid phase state.
2. carry out slagging-off work, with the Impurity removal in the aluminium alloy.
3. adding ceramic particle.
4. with stirring rod molten soup is stirred under solid-liquid phase temperature, this moment, molten soup temperature remained on 550-700 ℃.
5. the ejaculation system of die casting equipment has been ladled out and injected to the molten soup that will stir with mechanical arm, penetrates and be shaped, and the clamp force of die casting board is 200-250ton, and the casting area pressure during ejaculation is 150-250Kg/cm
2
The coefficient of heat conduction of the fin that obtains by said method is 150W/mK.
Embodiment 2
Aluminium alloy adopts AlMgSi, and the composition of this aluminium alloy is with embodiment 1.
Carborundum accounts for 25% weight ratio of integral heat sink sheet, and the particle diameter of carborundum is 120 μ m.Concrete grammar is as follows:
1. smelting furnace is heated to 660-720 ℃ with aluminium alloy, and definite aluminium alloy is entirely liquid phase state.
2. carry out slagging-off work, with the Impurity removal in the aluminium alloy.
3. adding ceramic particle.
4. with stirring rod molten soup is stirred under solid-liquid phase temperature, this moment, molten soup temperature remained on 550-700 ℃.
5. the ejaculation system of die casting equipment has been ladled out and injected to the molten soup that will stir with mechanical arm, penetrates and be shaped, and the clamp force of die casting board is 200-250ton, and the casting area pressure during ejaculation is 150-250Kg/cm
2
The coefficient of heat conduction of the fin that obtains by said method is 315W/mK.
Embodiment 3
Aluminium alloy adopts AlMgSi, and the composition of this aluminium alloy is with embodiment 1.
Carborundum accounts for 60% weight ratio of integral heat sink sheet, and the particle diameter of carborundum is 320 μ m.Concrete grammar is as follows:
1. smelting furnace is heated to 700-760 ℃ with aluminium alloy, and definite aluminium alloy is entirely liquid phase state.
2. carry out slagging-off work, with the Impurity removal in the aluminium alloy.
3. adding ceramic particle.
4. with stirring rod molten soup is stirred under solid-liquid phase temperature, this moment, molten soup temperature remained on 590-630 ℃.
5. the ejaculation system of die casting equipment has been ladled out and injected to the molten soup that will stir with mechanical arm, penetrates and be shaped, and the clamp force of die casting board is 200-250ton, and the casting area pressure during ejaculation is 150-250Kg/cm
2
The coefficient of heat conduction of the fin that obtains by said method is 400W/mK.
Claims (6)
1. one kind high heat conducting heat radiating fin structure is characterized in that the integral heat sink sheet is shapes of making various nearly clean shapes according to the needs of practical application, and integrally-built again main body lies in the ceramic particle of sneaking into proper proportion in the aluminium alloy.
2. the heat conducting heat radiating fin structure of height according to claim 1 is characterized in that this aluminium alloy is one or more among AlSi, AlSiCu, AlSiZn, AlSiMg, AlSiCuMg, AlGe, AlGeSi, AlCu, AlMn, AlLi, AlSn and the AlPb.
3. the heat conducting heat radiating fin structure of height according to claim 1 is characterized in that this ceramic particle is a carborundum.
4. the heat conducting heat radiating fin structure of height according to claim 3 is characterized in that the particle diameter of this carborundum is advisable with 40-3000 μ m.
5. the heat conducting heat radiating fin structure of height according to claim 1 is characterized in that this ceramic particle system accounts for the part by weight of integral heat sink sheet 0.5-80%.
6. the manufacture method of a high heat conducting heat radiating fin structure, its step is as follows:
1. with smelting furnace aluminium alloy is heated to more than 660 ℃, and definite aluminium alloy is entirely liquid phase state.
2. carry out slagging-off work, with the Impurity removal in the aluminium alloy.
3. adding ceramic particle reaches 0.5-80% to weight ratio.
4. with stirring rod molten soup is stirred under solid-liquid phase temperature, this moment, molten soup temperature remained on 550-700 ℃.
5. the ejaculation system of die casting equipment has been ladled out and injected to the molten soup that will stir with mechanical arm, penetrates and be shaped, and the clamp force of die casting board is 200-250ton, and the casting area pressure during ejaculation is 150-250Kg/cm
2
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121735 CN1463039A (en) | 2002-05-29 | 2002-05-29 | Structure of thermal fin with high heat conductivity and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121735 CN1463039A (en) | 2002-05-29 | 2002-05-29 | Structure of thermal fin with high heat conductivity and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662184A (en) * | 2012-09-28 | 2015-05-27 | 陶氏环球技术有限责任公司 | Microsphere-filled-metal components for wireless-communication towers |
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2002
- 2002-05-29 CN CN 02121735 patent/CN1463039A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662184A (en) * | 2012-09-28 | 2015-05-27 | 陶氏环球技术有限责任公司 | Microsphere-filled-metal components for wireless-communication towers |
| CN104662184B (en) * | 2012-09-28 | 2018-03-02 | 陶氏环球技术有限责任公司 | The metal assembly that microsphere for wireless communication tower is filled |
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