CN104987112A - Sheet alumina porous ceramic for high-finish-degree LED lamp heat dissipation and preparation method therefor - Google Patents
Sheet alumina porous ceramic for high-finish-degree LED lamp heat dissipation and preparation method therefor Download PDFInfo
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- CN104987112A CN104987112A CN201510440248.4A CN201510440248A CN104987112A CN 104987112 A CN104987112 A CN 104987112A CN 201510440248 A CN201510440248 A CN 201510440248A CN 104987112 A CN104987112 A CN 104987112A
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Abstract
The invention relates to a sheet alumina porous ceramic for high-finish-degree LED lamp heat dissipation. The sheet alumina porous ceramic is prepared from the following raw materials in parts by weight: 34-36 parts of alpha-Al2O3 (with the grain size of 2-8 [mu]m), 100-105 parts of deionized water, 0.2-0.3 part of sodium polyacrylate, 2-2.3 parts of methylcellulose, 1.6-1.8 parts of glycerol, 2.6-2.9 parts of phosphate carbonyl iron powder, 0.5-0.8 part of nano-silicon dioxide, 0.4-0.6 part of zinc hydroxystannate, 0.6-0.8 part of lead metaborate, 4-5 parts of nano-aluminum hydroxide, 1.2-1.5 parts of nano-copper and 0.9-1.1 parts of PVA binding agent. Pore passages between layers of the sheet alumina porous ceramic disclosed by the invention are communicated, and the sheet alumina porous ceramic is good in transition and good in thermal fatigue property; and by using the phosphate carbonyl iron powder, nano-silicon dioxide, zinc hydroxystannate and lead metaborate, the strength, compactness, toughness, degree of finish, hardness and elastic modulus of the ceramic are improved, and the sheet alumina porous ceramic is suitable for high-power LED lamp heat dissipation materials.
Description
Technical field
The present invention relates to porous heat dissipation ceramic field, particularly relate to a kind of best bright finish LED heat transmission tabular alumina porous ceramics 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 a kind of best bright finish LED heat transmission tabular alumina porous ceramics, intensity, the consistency and elasticity modulus of this tabular alumina porous ceramics are high, and compactness, toughness, smooth finish are good, are applicable to the heat sink material of high-powered LED lamp.
Technical scheme of the present invention is as follows:
A kind of best bright finish LED heat transmission tabular alumina porous ceramics, 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, phosphate carbonyl iron powder 2.6-2.9, nano silicon 0.5-0.8, zinc hydroxyl stannate 0.4-0.6, lead borate 0.6-0.8, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.
The production method of described best bright finish LED heat transmission tabular alumina porous ceramics, is characterized in that:
(1) by α-Al
2o
3, phosphate carbonyl iron powder, deionized water, sodium polyacrylate mixes, and obtains suspension, by suspension ball milling 5-5.5h, add nano silicon, zinc hydroxyl stannate, lead borate, mix, then add PVA binding agent, mix, add nano-aluminum hydroxide again, ball milling 0.5-1h, leaves standstill 40-60min, obtains 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 phosphate carbonyl iron powder, nano silicon, zinc hydroxyl stannate, lead borate, improve the intensity of pottery, compactness, toughness, smooth finish and consistency and elasticity modulus, being applicable to the heat sink material of high-powered LED lamp.
Embodiment
A kind of best bright finish LED heat transmission tabular alumina porous ceramics, 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 103, sodium polyacrylate 0.2, methylcellulose gum 2.1, glycerol 1.7, phosphate carbonyl iron powder 2.7, nano silicon 0.7, zinc hydroxyl stannate 0.5, lead borate 0.7, nano-aluminum hydroxide 4.5, Nanometer Copper 1.4, PVA binding agent 1.
The production method of described best bright finish LED heat transmission tabular alumina porous ceramics, is characterized in that:
(1) by α-Al
2o
3, phosphate carbonyl iron powder, deionized water, sodium polyacrylate mixes, and obtains suspension, by suspension ball milling 5.5h, add nano silicon, zinc hydroxyl stannate, lead borate, mix, then add PVA binding agent, mix, add nano-aluminum hydroxide again, ball milling 0.8h, leaves standstill 50min, obtains 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 2.5h, then carry out froth in vacuum 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 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 686 times, finds out that the thermal fatigue property of this sample is fine.
Claims (2)
1. a best bright finish LED heat transmission tabular alumina porous ceramics, 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, phosphate carbonyl iron powder 2.6-2.9, nano silicon 0.5-0.8, zinc hydroxyl stannate 0.4-0.6, lead borate 0.6-0.8, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.
2. the production method of best bright finish LED heat transmission tabular alumina porous ceramics according to claim 1, is characterized in that:
(1) by α-Al
2o
3, phosphate carbonyl iron powder, deionized water, sodium polyacrylate mixes, and obtains suspension, by suspension ball milling 5-5.5h, add nano silicon, zinc hydroxyl stannate, lead borate, mix, then add PVA binding agent, mix, add nano-aluminum hydroxide again, ball milling 0.5-1h, leaves standstill 40-60min, obtains 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510440248.4A CN104987112A (en) | 2015-07-24 | 2015-07-24 | Sheet alumina porous ceramic for high-finish-degree LED lamp heat dissipation and preparation method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510440248.4A CN104987112A (en) | 2015-07-24 | 2015-07-24 | Sheet alumina porous ceramic for high-finish-degree LED lamp heat dissipation and preparation method therefor |
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| CN104987112A true CN104987112A (en) | 2015-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190359875A1 (en) * | 2017-03-02 | 2019-11-28 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Alumina-based thermally conductive oxide and method for producing same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498876A (en) * | 2002-11-04 | 2004-05-26 | 原效坤 | Method for preparing composite engineering ceramics material of nano ZrO2 (Y2O3)/A12O3/Cu |
| CN1498877A (en) * | 2002-11-04 | 2004-05-26 | 原效坤 | Method for preparing combined functional ceramic material of nano ZrO2 (Y203)/Cu |
-
2015
- 2015-07-24 CN CN201510440248.4A patent/CN104987112A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498876A (en) * | 2002-11-04 | 2004-05-26 | 原效坤 | Method for preparing composite engineering ceramics material of nano ZrO2 (Y2O3)/A12O3/Cu |
| CN1498877A (en) * | 2002-11-04 | 2004-05-26 | 原效坤 | Method for preparing combined functional ceramic material of nano ZrO2 (Y203)/Cu |
Non-Patent Citations (1)
| Title |
|---|
| 韩沈丹 等: ""多层低温流延法制备片状氧化铝多孔陶瓷"", 《硅酸盐学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190359875A1 (en) * | 2017-03-02 | 2019-11-28 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Alumina-based thermally conductive oxide and method for producing same |
| TWI806853B (en) * | 2017-03-02 | 2023-07-01 | 日商大日精化工業股份有限公司 | Powdered alumina-based thermally conductive oxide and method for producing the same |
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Application publication date: 20151021 |
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