CN104987113A - Zirconium silicate whisker modified tabular alumina porous ceramic used in LED lamp heat dissipation, and preparation method thereof - Google Patents
Zirconium silicate whisker modified tabular alumina porous ceramic used in LED lamp heat dissipation, and preparation method thereof Download PDFInfo
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- CN104987113A CN104987113A CN201510440279.XA CN201510440279A CN104987113A CN 104987113 A CN104987113 A CN 104987113A CN 201510440279 A CN201510440279 A CN 201510440279A CN 104987113 A CN104987113 A CN 104987113A
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Abstract
The invention relates to zirconium silicate whisker modified tabular alumina porous ceramic used in LED lamp heat dissipation. The ceramic is prepared from the raw materials of, by weight, 34-36 parts of alpha-Al2O3, 100-105 parts of deionized water, 0.2-0.3 parts of sodium polyacrylate, 2-2.3 parts of methylcellulose, 1.6-1.8 parts of glycerol, 1.5-1.9 parts of Be(AlO2)2, 0.4-0.6 parts of acetylene black, 0.4-0.6 parts of zirconium silicate whiskers, 1.1-1.4 parts of LaO.6Al2O3, 4-5 parts of nano-grade aluminum oxide, 1.2-1.5 parts of nano-grade copper, and 0.9-1.1 parts of a PVA binding agent. According to the invention, with Be(AlO2)2, acetylene black, zirconium silicate whisker and LaO.6Al2O3, ceramic toughness, heat conductivity and hardness are improved. When the ceramic is compounded with metal, the wettability and adhesion are good. The ceramic is suitable for a high-power LED chip heat-dissipation ceramic substrate.
Description
Technical field
The present invention relates to porous heat dissipation ceramic field, particularly relate to whisker modified tabular alumina porous ceramics of a kind of LED heat transmission zirconium silicate and preparation method thereof.
Background technology
Photodiode (LED) is that a class directly by the luminescent device that electric energy conversion is visible ray and radiating capacity, have powerful market potential, and great power LED can be thought the Main way 1 in lighting source market by industry.Under present level, the power input of 10% ~ 20% can only be converted into luminous energy by great power LED, and all the other 80% ~ 90% are all converted into heat energy.For ensureing that it normally works, need ensure that the working temperature of LED is in allowed band by effective heat dissipation design.Therefore great power LED chip cooling problem has become the obstacle that current LED technology is applied in illuminating engineering.
Scholar is had to use powder metallurgic method to prepare metal/ceramic heat sink compound.But due to metal and ceramic fusing point difference comparatively large, therefore not easily burn altogether.If will there is small-bore, the porous ceramics of clear opening and metal composite, two-phase not only can be avoided to burn altogether, when can also reduce metal and Ceramic Composite, have scholar to use powder metallurgic method to prepare metal/ceramic heat sink compound because two-phase thermal expansivity does not mate to cause in use.But due to metal and ceramic fusing point difference comparatively large, therefore not easily burn altogether.If by having small-bore, the porous ceramics of clear opening and metal composite, two-phase not only can be avoided to burn altogether, because two-phase thermal expansivity does not mate the Cracking Failure problem caused in use when can also reduce metal and Ceramic Composite.And prepare the key that this flake porous pottery is this technical development.
Flow casting molding prepares one of big area, the most effective means of thin plate stupalith at present.Replace the casting technology of organic solvent to become the emphasis of research at present due to its hypotoxicity, oligosaprobic feature using water as solvent.Simultaneously freeze-drying in the porous ceramics of controlled, the high through-hole rate of preparation aperture size also tool have great advantage." multilayer low temperature curtain coating legal system is for tabular alumina porous ceramics " literary composition describes the method preparing alumina porous ceramic, and the thermal fatigue of ceramics performance of making is good.But the method can not be even by alumina dispersion, and easily reunite, ceramic structure is uneven, and if this ceramic plate is applied to LED radiator element, also need the problem such as toughness, thermal conductivity, crack resistence, thermotolerance improving pottery.The consistency of this ceramic plate and metal is poor, needs to improve.
Summary of the invention
The object of the present invention is to provide the whisker modified tabular alumina porous ceramics of a kind of LED heat transmission zirconium silicate, toughness, the thermal conductivity of this tabular alumina porous ceramics are good, hardness is high, with wettability during metal composite and cohesiveness good, be applicable to high-power LED chip heat dissipation ceramic substrate.
Technical scheme of the present invention is as follows:
The whisker modified tabular alumina porous ceramics of a kind of LED heat transmission zirconium silicate, is characterized in that being made up of the raw material of following weight part: α-Al
2o
3(particle diameter is 2-8 μm) 34-36, deionized water 100-105, sodium polyacrylate 0.2-0.3, methylcellulose gum 2-2.3, glycerol 1.6-1.8, Be (AlO
2)
21.5-1.9, acetylene carbon black 0.4-0.6, zirconium silicate whisker 0.4-0.6, LaO6Al
2o
31.1-1.4, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.
The production method of the described whisker modified tabular alumina porous ceramics of LED heat transmission zirconium silicate, is characterized in that:
(1) by α-Al
2o
3, deionized water, sodium polyacrylate mix, obtain suspension, by suspension ball milling 5-5.5h, add Be (AlO
2)
2, acetylene carbon black, zirconium silicate whisker, LaO6Al
2o
3, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, ball milling 0.5-1h, leave standstill 40-60min, obtain slurry;
(2) slurry that (1) step obtains is added methylcellulose gum and glycerol, continue ball milling 20-22h, then add other remaining component, continue ball milling 2-2.5h, then carry out froth in vacuum 5-6min, obtain Al
2o
3ceramic size;
(3) by Al that (2) step obtains
2o
3ceramic size is flow casting molding on the low-temperature receiver of-45 DEG C at pre-freezing temperature, and control scraper gap is 1mm, after cast layer crystallization, and repetitive operation, every layer thickness controls, for 1mm, to obtain multilayer cast sheet;
(4) by after multilayer cast sheet lyophilize 23-24h, sinter at 1600-1650 DEG C, insulation 2-2.5h, then be chilled to room temperature with stove, to obtain final product.
Beneficial effect of the present invention
Tabular alumina porous ceramics interlayer duct of the present invention is communicated with, and transition is good, and thermal fatigue property is good; By using nano-aluminum hydroxide, improve the phenomenon that alumina particle is easily reunited; By using Nanometer Copper, improve pottery and the consistency of metal, because two-phase thermal expansivity does not mate the Cracking Failure problem caused in use when reducing metal and Ceramic Composite; By using Be (AlO2)
2, acetylene carbon black, zirconium silicate whisker, LaO6Al
2o
3, improve pottery toughness, thermal conductivity, hardness, with wettability during metal composite and cohesiveness good, be applicable to high-power LED chip heat dissipation ceramic substrate.
Embodiment
The whisker modified tabular alumina porous ceramics of a kind of LED heat transmission zirconium silicate, is made up of the raw material of following weight part (kilogram): α-Al
2o
3(particle diameter is 2-8 μm) 35, deionized water 102, sodium polyacrylate 0.3, methylcellulose gum 2.1, glycerol 1.7, Be (AlO
2)
21.7, acetylene carbon black 0.5, zirconium silicate whisker 0.5, LaO6Al
2o
31.3, nano-aluminum hydroxide 4.5, Nanometer Copper 1.4, PVA binding agent 1.
The production method of the described whisker modified tabular alumina porous ceramics of LED heat transmission zirconium silicate, is characterized in that:
(1) by α-Al
2o
3, deionized water, sodium polyacrylate mix, obtain suspension, by suspension ball milling 5h, add Be (AlO
2)
2, acetylene carbon black, zirconium silicate whisker, LaO6Al
2o
3, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, ball milling 0.8h, leave standstill 50min, obtain slurry;
(2) slurry that (1) step obtains is added methylcellulose gum and glycerol, continue ball milling 21h, then add other remaining component, continue ball milling 2h, then carry out froth in vacuum 5min, obtain Al
2o
3ceramic size;
(3) by Al that (2) step obtains
2o
3ceramic size is flow casting molding on the low-temperature receiver of-45 DEG C at pre-freezing temperature, and control scraper gap is 1mm, after cast layer crystallization, and repetitive operation, every layer thickness controls, for 1mm, to obtain multilayer cast sheet;
(4) by after multilayer cast sheet lyophilize 24h, sinter at 1650 DEG C, insulation 2.5h, then be chilled to room temperature with stove, to obtain final product.
Experimental data: by sample after 300 slow cooling (25 DEG C), 200 chillings (25 DEG C) and 195 chillings (– 20 DEG C), the cycle index that sample crackle occurs is 755 times, finds out that the thermal fatigue property of this sample is fine.
Claims (2)
1. the whisker modified tabular alumina porous ceramics of LED heat transmission zirconium silicate, is characterized in that being made up of the raw material of following weight part: α-Al
2o
3(particle diameter is 2-8 μm) 34-36, deionized water 100-105, sodium polyacrylate 0.2-0.3, methylcellulose gum 2-2.3, glycerol 1.6-1.8, Be (AlO
2)
21.5-1.9, acetylene carbon black 0.4-0.6, zirconium silicate whisker 0.4-0.6, LaO6Al
2o
31.1-1.4, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.
2. the production method of the whisker modified tabular alumina porous ceramics of LED heat transmission zirconium silicate according to claim 1, is characterized in that:
(1) by α-Al
2o
3, deionized water, sodium polyacrylate mix, obtain suspension, by suspension ball milling 5-5.5h, add Be (AlO
2)
2, acetylene carbon black, zirconium silicate whisker, LaO6Al
2o
3, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, ball milling 0.5-1h, leave standstill 40-60min, obtain slurry;
(2) slurry that (1) step obtains is added methylcellulose gum and glycerol, continue ball milling 20-22h, then add other remaining component, continue ball milling 2-2.5h, then carry out froth in vacuum 5-6min, obtain Al
2o
3ceramic size;
(3) by Al that (2) step obtains
2o
3ceramic size is flow casting molding on the low-temperature receiver of-45 DEG C at pre-freezing temperature, and control scraper gap is 1mm, after cast layer crystallization, and repetitive operation, every layer thickness controls, for 1mm, to obtain multilayer cast sheet;
(4) by after multilayer cast sheet lyophilize 23-24h, sinter at 1600-1650 DEG C, insulation 2-2.5h, then be chilled to room temperature with stove, to obtain final product.
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|---|---|---|---|
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| CN201510440279.XA CN104987113A (en) | 2015-07-24 | 2015-07-24 | Zirconium silicate whisker modified tabular alumina porous ceramic used in LED lamp heat dissipation, and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671747A (en) * | 2013-11-26 | 2015-06-03 | 济源赛孚工业陶瓷有限公司 | A rare earth aluminum oxide ceramic roller and a preparing method thereof |
| CN108752029A (en) * | 2018-08-20 | 2018-11-06 | 合肥汉甲陶瓷科技有限公司 | A kind of modified zirconium silicate whisker reinforcement aluminium oxide ceramics |
| CN113234955A (en) * | 2021-04-30 | 2021-08-10 | 浙江利丰电器股份有限公司 | Silver-copper alloy material for manufacturing commutator copper sheet |
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| CN108752029A (en) * | 2018-08-20 | 2018-11-06 | 合肥汉甲陶瓷科技有限公司 | A kind of modified zirconium silicate whisker reinforcement aluminium oxide ceramics |
| CN108752029B (en) * | 2018-08-20 | 2021-08-10 | 淄博奥克非金属新材料科技有限公司 | Modified zirconium silicate whisker reinforced alumina ceramic |
| CN113234955A (en) * | 2021-04-30 | 2021-08-10 | 浙江利丰电器股份有限公司 | Silver-copper alloy material for manufacturing commutator copper sheet |
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Application publication date: 20151021 |