CN103435334B - LED electricity-saving lamp pedestal composite ceramic material - Google Patents
LED electricity-saving lamp pedestal composite ceramic material Download PDFInfo
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- CN103435334B CN103435334B CN201310347925.9A CN201310347925A CN103435334B CN 103435334 B CN103435334 B CN 103435334B CN 201310347925 A CN201310347925 A CN 201310347925A CN 103435334 B CN103435334 B CN 103435334B
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Abstract
The present invention relates to a kind of LED electricity-saving lamp pedestal composite ceramic material.This composite ceramic material weight percent that is raw materials used and raw material is: alpha-aluminium oxide powder 55.0 ~ 95.0%, aluminum nitride powder 5.0 ~ 45.0%.The particle diameter < 0.010mm of alpha-aluminium oxide powder, the particle diameter of aluminum nitride powder is < 0.005mm.Its forming method can adopt hot die-casting molding, compression molding or hot-forming.Its process for calcining can adopt the normal pressure-sintered or nitriding atmosphere hot pressed sintering of nitriding atmosphere, the firing temperature of different process for calcining all >=1500 DEG C.The hot thermal conductivity of LED electricity-saving lamp pedestal composite ceramic material of the present invention is low, the working temperature of LED electricity-saving lamp can be reduced, improve luminous efficiency and the work-ing life of LED electricity-saving lamp, for China's LED electricity-saving lamp field provides a kind of high temperature structural material, have broad application prospects.
Description
Technical field
The invention belongs to high-temperature structural ceramics field, be specifically related to a kind of LED electricity-saving lamp pedestal composite ceramic material.
Background technology
LED and semiconductor light-emitting-diode (Light-Emitting-Diode) are solid cold light sources of new generation, and LED light source has been the second revolution of incandescent lamp illumination developing history since 120 years that continue.The features such as LED electricity-saving lamp for luminous source, has the high and low power consumption of light efficiency with high brightness white light-emitting diode, and the life-span is long.The brightness of illumination of LED electricity-saving lamp is 10 times of incandescent light, more than 2.5 times of common energy-saving lamp, and work-ing life is 50 times of incandescent light, more than 12 times of common energy-saving lamp.
Although the luminous efficiency of LED electricity-saving lamp is far above conventional light source such as incandescent light, but also have an appointment 60% electric energy form heat energy when photoelectric conversion process, this partial heat energy can increase the working temperature of LED semi-conductor chip if do not got rid of, significantly reduce luminous quantity and the work-ing life of LED electricity-saving lamp.As LED semi-conductor chip working temperature 45 DEG C work 330000 hours, 95 DEG C of working hours were down to 25000 hours.Therefore the major issue being set to restriction LED electricity-saving lamp industry development process of LED electricity-saving lamp cooling mechanism.
The cooling mechanism of LED electricity-saving lamp arranges and is divided into: the heat radiation of LED semiconductor chip mounting substrate, pedestal heat radiation.The existing substrate of LED electricity-saving lamp, the material of pedestal are mainly metallic aluminium, alumina-ceramic.Metallic aluminium has higher thermal conductivity because of it, is LED base material conventional at present.But the electroconductibility that metallic aluminium has, high thermal expansion coefficient, to characteristics such as function of environment heat emission poor performance, affect the application development of LED electricity-saving lamp.Alumina-ceramic is also that LED electricity-saving lamp commonly uses base material, its heat conductivility not as metallic aluminium, but electrical insulating property is good, thermal expansivity is low, good to the heat loss through radiation performance of environment.
The electrical insulating property of alumina-ceramic is good, LED electricity-saving lamp semi-conductor chip can directly be installed on the cooling base of alumina-ceramic, simplify LED electricity-saving lamp substrate and making and installation operation, particularly eliminate the thermal contact resistance between substrate and pedestal when heat is arranged outward, the transmission being conducive to semiconductor chip thermal is arranged outward.Much lower than the thermal expansivity of metallic aluminium of alumina-ceramic, the difference of alumina-ceramic thermal expansivity and semi-conductor chip is less, the structural stress produced between aluminum oxide pedestal and semi-conductor chip when LED electricity-saving lamp uses is little, is conducive to the structural integrity of LED energy-saving lamp component, working reliability etc.In addition, the heat loss through radiation of alumina-ceramic to environment is effective, is conducive to the reduction of LED electricity-saving lamp pedestal and LED semi-conductor chip temperature.But the thermal conductivity of alumina-ceramic is less, namely the heat flux passed through is less the alumina-ceramic body unit time, when alumina-ceramic is used as high-power LED energy-saving lamp pedestal, if by the hot-fluid migration amount of alumina ceramics body lower than LED semi-conductor chip quantity of heat production, can cause that the accumulation of heat of LED semi-conductor chip, temperature raise, luminous efficiency reduces, short service life.
Summary of the invention
The object of the invention is to overcome the deficiency in above-mentioned existing LED electricity-saving lamp pedestal stupalith technology, a kind of LED electricity-saving lamp pedestal composite ceramic material is provided.
In order to realize foregoing invention object, the invention provides following technical scheme:
A kind of LED electricity-saving lamp pedestal composite ceramic material, this composite ceramic material weight percent that is raw materials used and raw material is: alpha-aluminium oxide powder 55.0 ~ 95.0%, aluminum nitride powder 5.0 ~ 45.0%.
The particle diameter < 0.010mm of alpha-aluminium oxide powder, the weight percent of alpha-aluminium oxide powder purity is: Al
2o
3>=99.0%.
The particle diameter of aluminum nitride powder is < 0.005mm, and the weight percent of aluminum nitride powder purity is: AlN >=93.0%.
The forming method of this composite ceramic material comprises: hot die-casting molding, compression molding or hot-forming.
The process for calcining of this composite ceramic material comprises: the normal pressure-sintered or nitriding atmosphere hot pressed sintering of nitriding atmosphere, the firing temperature of different process for calcining all >=1500 DEG C.
The anti-oxidation treatment method of this composite ceramic material is: thermal treatment temp >=800 DEG C under atmospheric air condition, soaking time >=30min.
Beneficial effect
Composite ceramic material of the present invention by have high heat conduction, low expansion character aluminium nitride introduce alumina-ceramic batching in prepare composite ceramic material.Compare with the common alumina ceramic material not introducing aluminium nitride, the thermal conductivity introducing the composite ceramic material of aluminium nitride improves, thermal expansion reduces, improve function of environment heat emission ability, and therefore the working temperature of LED semi-conductor chip reduces, luminous efficiency improves, the structural stress of LED semi-conductor chip and pedestal reduces, the operating lifetime of LED electricity-saving lamp.Show that this composite ceramic material is a kind of stupalith of being used as LED electricity-saving lamp pedestal more preferably than alumina ceramic material.The present invention can be China's LED electricity-saving lamp field and provides a kind of high temperature structural material, has broad application prospects and energy-saving significance.
Embodiment
Embodiment 1
LED electricity-saving lamp pedestal composite ceramic material weight percent that is raw materials used and raw material is: principal constituent alpha-aluminium oxide powder 65.0%, minor component aluminum nitride powder 35.0%.Slip after Alpha-alumina wet method regrind mill is dehydrated, rear alpha-alumina powder will be dehydrated and carry out dispersion treatment, alpha-alumina fine powder after dispersion mixes homogenizing with aluminum nitride powder, Alpha-alumina after homogenizing-aluminium nitride mixing fine powders and heating paraffin prepare wax liquid slurry, wax liquid slurry carries out hot die-casting molding ceramic body after stirring homogenizing, ceramic body is carried out nitrogen atmosphere high temperature sintering after dewaxing treatment, sintering temperature is 1700 DEG C of insulation 2h, stupalith after sintering carries out antioxidation treatment through 1000 DEG C of soaking time 30min under air conditions, obtain the composite ceramic material that can be used as LED electricity-saving lamp pedestal afterwards.
The thermal conductivity of this composite ceramic material is 62.4W/mK, and the thermal conductivity (19.3W/mK) of relative Oxidation aluminium stupalith has and increases substantially.Therefore when this composite ceramic material is used as LED electricity-saving lamp pedestal, there is better safe reliability, work-ing life and the luminous efficiency of LED electricity-saving lamp can be improved.
Embodiment 2
LED electricity-saving lamp pedestal composite ceramic material weight percent that is raw materials used and raw material is: principal constituent alpha-aluminium oxide powder 55.0%, minor component aluminum nitride powder 45.0%.By alpha-aluminium oxide powder, the leading dry blending of aluminum nitride powder, then add appropriate dehydrated alcohol-phenol resin solution (mass concentration of resol is 2%) to continue to be uniformly mixed 10 minutes, this compound adopts hydropress compression molding ceramic body after removing large portion ethanol, ceramic body is carried out nitrogen atmosphere high temperature sintering after drying, sintering temperature is 1700 DEG C of insulation 2h, stupalith after sintering carries out antioxidation treatment through 1000 DEG C of soaking time 30min under air conditions, obtains the composite ceramic material that can be used as LED electricity-saving lamp pedestal afterwards.
The thermal conductivity of this composite ceramic material is 75.2W/mK, and the thermal conductivity (19.3W/mK) of relative Oxidation aluminium stupalith has and increases substantially.Therefore when this composite ceramic material is used as LED electricity-saving lamp pedestal, there is better safe reliability, work-ing life and the luminous efficiency of LED electricity-saving lamp can be improved.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (1)
1. a LED electricity-saving lamp pedestal composite ceramic material, is characterized in that:
Described LED electricity-saving lamp pedestal composite ceramic material weight percent that is raw materials used and raw material is, principal constituent alpha-aluminium oxide powder 55.0%, minor component aluminum nitride powder 45.0%, by alpha-aluminium oxide powder, the leading dry blending of aluminum nitride powder, then appropriate dehydrated alcohol-phenol resin solution is added, the mass concentration of resol is 2%, continue to be uniformly mixed 10 minutes, this compound adopts hydropress compression molding ceramic body after removing most of ethanol, ceramic body is carried out nitrogen atmosphere high temperature sintering after drying, sintering temperature is 1700 DEG C of insulation 2h, composite ceramic material after sintering carries out antioxidation treatment, obtain the composite ceramic material that can be used as LED electricity-saving lamp pedestal afterwards,
The particle diameter of described raw material is: the particle diameter < 0.010mm of alpha-aluminium oxide powder, and the particle diameter of aluminum nitride powder is < 0.005mm; The purity of described raw material is: alpha-aluminium oxide powder is containing Al
2o
3>=99.0wt%, aluminum nitride powder is containing AlN>=93.0wt%;
The anti-oxidation treatment method of described composite ceramic material is: thermal treatment temp >=800 DEG C under atmospheric air condition, soaking time >=30min.
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| CN201310347925.9A CN103435334B (en) | 2013-08-12 | 2013-08-12 | LED electricity-saving lamp pedestal composite ceramic material |
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| CN201310347925.9A CN103435334B (en) | 2013-08-12 | 2013-08-12 | LED electricity-saving lamp pedestal composite ceramic material |
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| CN103435334A CN103435334A (en) | 2013-12-11 |
| CN103435334B true CN103435334B (en) | 2015-11-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105254286A (en) * | 2015-09-11 | 2016-01-20 | 西宁科进工业设计有限公司 | High-heat-conduction ceramic material and manufacturing method therefor |
| WO2017041282A1 (en) * | 2015-09-11 | 2017-03-16 | 许亮芳 | High thermal conductivity ceramic material and manufacturing method thereof |
| CN105294079A (en) * | 2015-10-26 | 2016-02-03 | 西宁科进工业设计有限公司 | High-thermal-conductivity ceramic material and manufacturing method thereof |
| WO2017079877A1 (en) * | 2015-11-09 | 2017-05-18 | 深圳市博世知识产权运营有限公司 | Ceramic material with high thermal conductivity and preparation method therefor |
| CN107318179A (en) * | 2017-07-20 | 2017-11-03 | 湖北国瓷科技有限公司 | A kind of method that toughened aluminum oxide makes high temperature co-firing heat-generating pipe |
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| CN1422827A (en) * | 2002-12-24 | 2003-06-11 | 山东大学 | Nitride/alumina based composite ceramic material and process of preparing the same |
| CN201983040U (en) * | 2011-01-30 | 2011-09-21 | 厦门莱肯照明科技有限公司 | LED (light-emitting diode) lamp device |
| CN102683570A (en) * | 2012-05-15 | 2012-09-19 | 复旦大学 | White light LED (Light Emitting Diode) packaged on composite ceramic substrate and preparation method thereof |
| CN103236491A (en) * | 2013-04-24 | 2013-08-07 | 研创光电科技（赣州）有限公司 | LED (light emitting diode) ceramic COB (chip on board) light source fluorescent lamp and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1422827A (en) * | 2002-12-24 | 2003-06-11 | 山东大学 | Nitride/alumina based composite ceramic material and process of preparing the same |
| CN201983040U (en) * | 2011-01-30 | 2011-09-21 | 厦门莱肯照明科技有限公司 | LED (light-emitting diode) lamp device |
| CN102683570A (en) * | 2012-05-15 | 2012-09-19 | 复旦大学 | White light LED (Light Emitting Diode) packaged on composite ceramic substrate and preparation method thereof |
| CN103236491A (en) * | 2013-04-24 | 2013-08-07 | 研创光电科技（赣州）有限公司 | LED (light emitting diode) ceramic COB (chip on board) light source fluorescent lamp and preparation method thereof |
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