CN105060865A - Sheet alumina porous ceramic for anti-ultraviolet LED lamp heat dissipation and preparation method thereof - Google Patents

Abstract

The invention relates to a sheet alumina porous ceramic for anti-ultraviolet 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, 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, 0.2-0.3 part of K2O, 0.9-1.1 part of zirconia aluminosilicate, 0.4-0.6 part of P2O5, 1.3-1.5 part of nano-zinc oxide, 4-5 parts of nano-aluminium hydroxide, 1.2-1.5 parts of nano-copper and 0.9-1.1 parts of PVA adhesive. Porous channels among sheet alumina porous ceramic layers are communicated, the transition is good, and the thermal fatigue performance is good; and the abrasive resistance of the ceramic is improved by using the zirconia aluminosilicate, P2O5 and nano-zinc oxide, so that the ceramic has good anti-ultraviolet performance, the ceramic is beneficial for the health of people, and the service life of the chip is prolonged.

Description

A kind of UV resistance LED heat transmission tabular alumina porous ceramics and preparation method thereof

Technical field

The present invention relates to porous heat dissipation ceramic field, particularly relate to a kind of UV resistance 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 high-power LED chip heat dissipation 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 UV resistance LED heat transmission tabular alumina porous ceramics, the wear resistance of this tabular alumina porous ceramics is good, has good UV resistance performance, is of value to HUMAN HEALTH, extends the work-ing life of chip.

Technical scheme of the present invention is as follows:

A kind of UV resistance 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, K ₂o0.2-0.3, Zirconia aluminosilicate 0.9-1.1, P ₂o ₅0.4-0.6, nano zine oxide 1.3-1.5, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.

The production method of described UV resistance LED heat transmission tabular alumina porous ceramics, 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 Zirconia aluminosilicate, P ₂o ₅, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, nano zine oxide, 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 Zirconia aluminosilicate, P ₂o ₅, nano zine oxide, improve the wear resistance of pottery, make pottery have good UV resistance performance, be of value to HUMAN HEALTH, extend work-ing life of chip.

Embodiment

A kind of UV resistance 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, K ₂o0.2, Zirconia aluminosilicate 1, P ₂o ₅0.5, nano zine oxide 1.4, nano-aluminum hydroxide 4.5, Nanometer Copper 1.4, PVA binding agent 1.

The production method of described UV resistance LED heat transmission tabular alumina porous ceramics, is characterized in that:

(1) by α-Al ₂o ₃, deionized water, sodium polyacrylate mix, obtain suspension, by suspension ball milling 5h, add Zirconia aluminosilicate, P ₂o ₅, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, nano zine oxide, ball milling 0.7h, 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 2.3h, 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 23h, sinter at 1600 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 701 times, finds out that the thermal fatigue property of this sample is fine.

Claims (2)

1. a UV resistance 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, K ₂o0.2-0.3, Zirconia aluminosilicate 0.9-1.1, P ₂o ₅0.4-0.6, nano zine oxide 1.3-1.5, nano-aluminum hydroxide 4-5, Nanometer Copper 1.2-1.5, PVA binding agent 0.9-1.1.

2. the production method of UV resistance LED heat transmission tabular alumina porous ceramics 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 Zirconia aluminosilicate, P ₂o ₅, mix, then add PVA binding agent, mix, then add nano-aluminum hydroxide, nano zine oxide, 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.