CN103075719A - Graphite coated aluminum radiator and manufacturing process thereof - Google Patents
Graphite coated aluminum radiator and manufacturing process thereof Download PDFInfo
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- CN103075719A CN103075719A CN2013100434434A CN201310043443A CN103075719A CN 103075719 A CN103075719 A CN 103075719A CN 2013100434434 A CN2013100434434 A CN 2013100434434A CN 201310043443 A CN201310043443 A CN 201310043443A CN 103075719 A CN103075719 A CN 103075719A
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Abstract
The invention discloses a graphite coated aluminum radiator and a manufacturing process thereof. The graphite coated aluminum radiator is manufactured by the following steps of: sintering 7 percent by weight of graphite powder, 5 percent by weight of copper powder, 5 percent by weight of aluminum powder, 14 percent by weight of silane coupling agent and 6 percent by weight of titanate coupling agent under a high-temperature condition to obtain a graphite composition; manufacturing the graphite composition into a high-thermal-conductivity graphite block through molding production equipment; cutting the graphite block into graphite flakes of a specification size as required; and coating the graphite flake serving as a heat-conducting substrate in an aluminum radiating substrate to manufacture the graphite coated aluminum radiator. Compared with aluminum and copper, the graphite has the advantages of quicker radiation, light weight and convenience in attachment and assembly with other radiators. Meanwhile, the graphite has an anisotropic heat transfer characteristic, can realize directional heat transfer, has a better heat transfer effect to other components and is low in cost.
Description
Technical field
The present invention relates to LED lamp field, relate in particular to a kind of aluminium radiator and manufacture craft thereof of coated graphite of the LED of being applicable to high-power illumination light fixture.
Background technology
The heat sink material of LED high-power illumination light fixture generally uses aluminium radiators or copper radiators more now, does the heat radiation conduction of light fixture.In fact this aluminium radiator or copper radiator are temperature-uniforming plate, and the heat samming is fallen.The thermal conductivity factor of copper is that (AL thermal conductivity factor: 200W/m*K, the Cu thermal conductivity factor: 380W/m*K), density then approximately is 3 times of (AL density: 2.7g/cm for approximately 1.8 times of aluminium
3, Cu density: 8.9g/cm
3), in other words, the fin of same volume, area, the weight of copper is 3 times of aluminium.Copper is as the radiator of LED lighting, although the heat conduction is high, cost is high, and rare radiator adopts copper product, and most radiator adopts aluminum.Existing aluminium radiator is because the coefficient of heat conduction of the finished heat radiator reality that the limit production of production technology goes out is lower than 200W/m*K, thereby the life-span that causes the LED lighting can not significantly be improved (100000 hours theoretical life-spans of LED luminescence chip), and light decay is very serious.Faster cost lower heat sink material or better manufacture craft are the keys that the LED lighting dispels the heat so seek to dispel the heat.
Summary of the invention
The technical problem to be solved in the present invention has been to provide aluminium radiator and the manufacture craft thereof of a kind of rapid heat dissipation, the coated graphite that lightweight, cost is low.
For solving the problems of the technologies described above, the present invention realizes by following scheme: a kind of aluminium radiator of coated graphite, the aluminium radiator of described coated graphite is the graphite powder by WT70%, the copper powder of WT5%, the aluminium powder of WT5%, the silane coupler of WT14%, the titanate coupling agent of WT6% sintering under hot conditions obtains graphite composite, graphite composite is made high conductive graphite piece by the mold pressing production equipment, graphite block is cut on demand the graphite flake of specification, this graphite flake is coated in the aluminum cooling substrates as heat conducting base material, namely makes the aluminium radiator of coated graphite.
Further, described high temperature, its scope is at 1000 ℃-1200 ℃.
A kind of manufacture craft of aluminium radiator of coated graphite, this manufacture craft mainly may further comprise the steps:
1), acid treatment: (particle diameter≤0.9mm) put into the pickling agent (sulfuric acid of pickling agent and the weight ratio of hydrogen peroxide are 3: 7) that is mixed by sulfuric acid and hydrogen peroxide soaked 120 minutes under 100 ± 5 ℃ hot environment at the levigate graphite powder more than 99% with phosphorus content;
2), washing: will wash PH=5-6.5 through acid-treated graphite powder;
3), high temperature puffing: will put into conserving graphite expanding furnace through the graphite powder after the washing, high temperature puffing is 4 hours under 800-1000 ℃ condition, slowly cools to room temperature again;
4), batch mixing: the graphite powder of high temperature gained is got 70%, add 5% copper powder, 5% aluminium powder, 14% silane coupler, 6% titanate coupling agent, mechanical mixture 15-20 minute, hot kneading 15-20 minute again (temperature: 80 ± 5 ℃) was made into thickener;
5), fragmentation: with the cooling of gained thickener, fragmentation, the graphite compound of fragmentation is put into conserving graphite expanding furnace, high temperature puffing is 1 hour under 1000-1200 ℃ condition, slowly cools to room temperature again;
6), mold pressing: the mould of packing into of the graphite compound after will be more expanded is pressed into the graphite block of certain size;
7), section: the graphite of gained is cut into the graphite flake that needs size;
8), coat to make: will need the graphite flake of size to be positioned in the aluminium die casting die cavity and by die casting graphite flake be coated die casting in aluminium die casting product; Perhaps will need the graphite flake of size to be positioned in the molded good aluminium section bar;
9), rear processing: above technique is finished the aluminium radiator that coated graphite is processed in product turning.
Advantage of the present invention is: graphite is compared with aluminium, copper, dispels the heat faster, lightweight, convenient and other radiator applying assembling.Simultaneously, graphite has anisotropic heat-transfer character (different from isotropic heat-transfer character of copper aluminium), can directedly conduct heat, and is better to other component (radiator) heat-transfer effect.The main component of graphite is material with carbon element, conveniently is easy to get, and is with low cost.Anticorrosive, acid and alkali-resistance, anti-oxidant, ageing resistance is strong, and its discarded object does not pollute the environment yet, and processing is also more convenient during with aluminium integral manufacturing radiator.Faster the heat that high-power LED light source produces, on graphite, conduct more completely, by vertical bidimensional high-termal conductivity of graphite heat is conducted on aluminium radiator again, thereby reduce the junction temperature of LED luminescence chip, improve the light efficiency of LED, the life-span of prolongation LED light fixture.
The present invention uses the graphite flake of high-termal conductivity to make heat radiating material, and the aluminium radiator that the outside coats is made the heat radiation sam plate, and the heat that graphite is conducted out evenly distributes.The whole thermal conductance of the aluminium radiator of coated graphite is than simple aluminium radiator high (can reach 380-420W/m*K), and is suitable with simple copper radiator thermal conductivity, and cheaper, and weight is lighter safer as the radiator of outdoor lamp the time.
Description of drawings
Below in conjunction with accompanying drawing the present invention is elaborated.
Fig. 1 is the aluminium radiator schematic diagram of coated graphite of the present invention;
Fig. 2 is the fabrication processing figure of the aluminium radiator of a kind of coated graphite of the present invention.
The specific embodiment
As shown in Figure 1 and Figure 2, a kind of aluminium radiator of coated graphite, the aluminium radiator of described coated graphite is that the titanate coupling agent sintering under 1000 ℃ of-1200 ℃ of hot conditions by the silane coupler of the aluminium powder of the copper powder of the graphite powder of WT70%, WT5%, WT5%, WT14%, WT6% obtains graphite composite, graphite composite is made high conductive graphite piece by the mold pressing production equipment, graphite block is cut on demand the graphite flake of specification, this graphite flake is coated in the aluminum cooling substrates as heat conducting base material, namely makes the aluminium radiator of coated graphite.
The manufacture craft of the aluminium radiator of a kind of coated graphite of the present invention, this technique mainly may further comprise the steps:
1), acid treatment: (particle diameter≤0.9mm) put into the pickling agent (sulfuric acid of pickling agent and the weight ratio of hydrogen peroxide are 3: 7) that is mixed by sulfuric acid and hydrogen peroxide soaked 120 minutes under 100 ± 5 ℃ hot environment at the levigate graphite powder more than 99% with phosphorus content;
2), washing: will wash PH=5-6.5 through acid-treated graphite powder;
3), high temperature puffing: will put into conserving graphite expanding furnace through the graphite powder after the washing, high temperature puffing is 4 hours under 800-1000 ℃ condition, slowly cools to room temperature again;
4), batch mixing: the graphite powder of high temperature gained is got 70%, add 5% copper powder, 5% aluminium powder, 14% silane coupler, 6% titanate coupling agent, mechanical mixture 15-20 minute, hot kneading 15-20 minute again (temperature: 80 ± 5 ℃) was made into thickener;
5), fragmentation: with the cooling of gained thickener, fragmentation, the graphite compound of fragmentation is put into conserving graphite expanding furnace, high temperature puffing is 1 hour under 1000 ℃ of-1200 ℃ of temperature conditions, slowly cools to room temperature again;
6), mold pressing: the mould of packing into of the graphite compound after will be more expanded is pressed into the graphite block of certain size;
7), section: the graphite of gained is cut into the graphite flake that needs size;
8), coat to make: will need the graphite flake of size to be positioned in the aluminium die casting die cavity and by die casting graphite flake be coated die casting in aluminium die casting product; Perhaps will need the graphite flake of size to be positioned in the molded good aluminium section bar;
9), rear processing: above technique is finished the aluminium radiator that coated graphite is processed in product turning.
With regard to heat conductivility, the material of heat radiation is undoubtedly most important factor, and statistics finds that high purity graphite is best Heat Conduction Material.This material has bidimensional heat conductivity in the plane, can produce up to 800W/mK, and in the scope of third dimension conductibility at 6-10W/mK of thickness direction.The traditional heat-dissipating material, for example aluminium and copper are identical to all direction heat transfer efficiencys, but because high contact resistance, they can not carry out conducting heat between the component effectively.The weight of graphite material is usually light by 30% than the aluminium of same size in addition, and light by 80% (its density is 2.3-2.6g/cm than copper
3). but the machining property of high purity graphite is unstable, frangible, the present invention chooses the excellent processing characteristics of aluminium with the high thermal conductivity combination of high purity graphite, realizes the good heat radiating of LED lighting, improve the service life of light fixture, reduce the light decay of LED luminescence chip.
The above only is preferred embodiment of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (5)
1. the aluminium radiator of a coated graphite, it is characterized in that: the aluminium radiator of described coated graphite is that the titanate coupling agent sintering under hot conditions by the silane coupler of the aluminium powder of the copper powder of the graphite powder of WT70%, WT5%, WT5%, WT14%, WT6% obtains graphite composite, graphite composite is made high conductive graphite piece by the mold pressing production equipment, graphite block is cut on demand the graphite flake (1) of specification, this graphite flake (1) is coated in the aluminum cooling substrates (2) as heat conducting base material, namely makes the aluminium radiator of coated graphite.
2. according to the aluminium radiator of a kind of coated graphite claimed in claim 1, it is characterized in that: described high temperature, its scope are at 1000 ℃-1200 ℃.
3. the manufacture craft of the aluminium radiator of a coated graphite is characterized in that following steps:
1), acid treatment: (particle diameter≤0.9mm) put into the pickling agent that is mixed by sulfuric acid and hydrogen peroxide soaked 120 minutes under 100 ± 5 ℃ hot environment at the levigate graphite powder more than 99% with phosphorus content;
2), washing: will wash PH=5-6.5 through acid-treated graphite powder;
3), high temperature puffing: will put into conserving graphite expanding furnace through the graphite powder after the washing, high temperature puffing is 4 hours under 800-1000 ℃ condition, slowly cools to room temperature again;
4), batch mixing: the graphite powder of high temperature gained is got 70%, add 5% copper powder, 5% aluminium powder, 14% silane coupler, 6% titanate coupling agent, mechanical mixture 15-20 minute, hot kneading 15-20 minute again (temperature: 80 ± 5 ℃) was made into thickener;
5), fragmentation: with the cooling of gained thickener, fragmentation, the graphite compound of fragmentation is put into conserving graphite expanding furnace, high temperature puffing 1 hour slowly cools to room temperature again;
6), mold pressing: the mould of packing into of the graphite compound after will be more expanded is pressed into the graphite block of certain size;
7), section: the graphite of gained is cut into the graphite flake that needs size;
8), coat to make: will need the graphite flake of size to be positioned in the aluminium die casting die cavity and by die casting graphite flake be coated die casting in aluminium die casting product; Perhaps will need the graphite flake of size to be positioned in the molded good aluminium section bar;
9), rear processing: above technique is finished the aluminium radiator that coated graphite is processed in product turning.
4. according to the manufacture craft of the aluminium radiator of a kind of coated graphite claimed in claim 3, it is characterized in that step 1), the sulfuric acid of described pickling agent and the weight ratio of hydrogen peroxide are 3: 7.
5. according to the manufacture craft of the aluminium radiator of a kind of coated graphite claimed in claim 3, it is characterized in that step 5), described high temperature, its scope is at 1000 ℃-1200 ℃.
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| CN2013100434434A CN103075719A (en) | 2013-02-04 | 2013-02-04 | Graphite coated aluminum radiator and manufacturing process thereof |
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| CN2013100434434A CN103075719A (en) | 2013-02-04 | 2013-02-04 | Graphite coated aluminum radiator and manufacturing process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021139006A (en) * | 2020-03-06 | 2021-09-16 | 国立大学法人 東京大学 | Sintered body, heat sink, method for producing sintered body and method for producing heat sink |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345467A (en) * | 1999-12-24 | 2002-04-17 | 日本碍子株式会社 | Heat sink material and method of manufacturing the heat sink material |
| EP1739742A1 (en) * | 2005-06-30 | 2007-01-03 | Polymatech Co., Ltd. | Thermally conductive member and cooling system using the same |
| CN102317236A (en) * | 2009-02-12 | 2012-01-11 | 电气化学工业株式会社 | Substrate comprising aluminum/graphite composite, heat dissipation part comprising same, and LED luminescent member |
| CN102692000A (en) * | 2012-06-04 | 2012-09-26 | 山西山地新源科技有限公司 | Graphite base plate for LED (light emitting diode) high-power illumination module and manufacturing technology of graphite base plate |
| CN102768998A (en) * | 2011-05-05 | 2012-11-07 | 优杰精密机械(苏州)有限公司 | Substrate for high-power electronic device module |
-
2013
- 2013-02-04 CN CN2013100434434A patent/CN103075719A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345467A (en) * | 1999-12-24 | 2002-04-17 | 日本碍子株式会社 | Heat sink material and method of manufacturing the heat sink material |
| EP1739742A1 (en) * | 2005-06-30 | 2007-01-03 | Polymatech Co., Ltd. | Thermally conductive member and cooling system using the same |
| CN102317236A (en) * | 2009-02-12 | 2012-01-11 | 电气化学工业株式会社 | Substrate comprising aluminum/graphite composite, heat dissipation part comprising same, and LED luminescent member |
| CN102768998A (en) * | 2011-05-05 | 2012-11-07 | 优杰精密机械(苏州)有限公司 | Substrate for high-power electronic device module |
| CN102692000A (en) * | 2012-06-04 | 2012-09-26 | 山西山地新源科技有限公司 | Graphite base plate for LED (light emitting diode) high-power illumination module and manufacturing technology of graphite base plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021139006A (en) * | 2020-03-06 | 2021-09-16 | 国立大学法人 東京大学 | Sintered body, heat sink, method for producing sintered body and method for producing heat sink |
| JP7299183B2 (en) | 2020-03-06 | 2023-06-27 | 国立大学法人 東京大学 | Sintered compact, heat sink, method for producing sintered compact, and method for producing heat sink |
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