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Preparation method of anti-purple-halo transparent ceramic panel for replacing sapphires

A technology for transparent ceramics and anti-purple halo is applied in the field of preparation of anti-purple halo transparent ceramic panels for replacing sapphire. The effect of high production capacity and high utilization rate

Active Publication Date: 2015-09-02
中科皓烨(东莞)材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many methods for preparing transparent ceramics, but all of them have their limitations. For example, when it is necessary to prepare a thin (0.2mm-1mm) ceramic panel, when dry pressing is used for sintering, the preparation method does not affect the ceramic element. There are certain requirements for the thickness of the green body. The green body is too thin and easy to crush, and it is impossible to obtain a full-sized ceramic panel. The thicker green body not only increases the difficulty of sintering, but also increases the cost of polishing; when using tape casting or grouting molding When sintering, this method can obtain a thin ceramic panel with a close size, but because the ceramic green body is thin, it is easy to warp during the sintering process, and a flat ceramic panel cannot be obtained
When injection molding is used for sintering, because this method needs to add a large amount of organic matter (20% to 30%), it is not easy to remove all organic matter in the degreasing process, which will affect the transparency of ceramics

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a preparation method for replacing sapphire with an anti-purple halo transparent ceramic panel, the preparation method comprising the following steps:

[0033] (1) AlON powder prepared by the thermite method is used as raw material: specifically, Al powder with a purity of 99.9% and Al with a purity of 99.99% 2 o 3 As the raw material, the mass percentage of the two is 9:91. Al powder and Al 2 o 3 Based on the total amount of powder composed of powder, add 1.1 times of absolute ethanol, use high-purity alumina balls as grinding balls, and the mass of the balls is twice the total amount of powder, and put them together into a polytetrafluoro tank for ball milling for 20 hours. The ball-milled slurry was dried in an oven at 60°C for 24 hours, and then ground to 200 mesh;

[0034](2) Place the mixed raw material obtained in step (1) in a boron nitride crucible for sintering in a carbon furnace, and fill it with high-purity nitrogen to keep the ...

Embodiment 2

[0040] The present embodiment provides a kind of preparation method that replaces sapphire anti-purple halo transparent ceramic panel, and described preparation method comprises the steps:

[0041] (1) Y prepared by co-precipitation method 2 o 3 As a raw material, specifically at room temperature, Y(NO 3 ) 3 Dissolve in deionized water, add dispersant (NH4) 2 SO 4 and PAA, sintering aid MgSO 4 ·7H 2 O, made into metal ion solution as the mother liquor, the total concentration of metal ions is 0.5mol / L; NH 4 HCO 3 Make a solution with deionized water as a precipitant, NH 4 HCO 3 The volume of the solution is 3 times of the volume of the mixed solution of metal ions;

[0042] (2) adopt forward titration method, the precipitation agent NH of step (1) 4 HCO 3 The solution was slowly added dropwise to the mother liquor at a speed of 3mL / min, while stirring, and after the titration reaction was completed, the stirring was continued for 20 hours;

[0043] (3) Wash the pr...

Embodiment 3

[0049] This embodiment provides a preparation method for replacing sapphire with an anti-purple halo transparent ceramic panel, the preparation method comprising the following steps:

[0050] (1) Spinel powder prepared by co-precipitation method is used as raw material, specifically, at room temperature, Al(NO 3 ) 3 and Mg(NO 3 ) 2 Dissolve in deionized water, add dispersant PAA, make metal ion mixed solution as mother liquor, the total concentration of metal ions is 0.5mol / L, and the molar ratio of Mg:Al is 1:2; analytically pure ammonia water is used as precipitant;

[0051] (2) Using the forward titration method, the precipitant ammonia water in step (1) is slowly added dropwise to the mother liquor at a speed of 2mL / min, while stirring, and after the titration reaction ends, continue to stir for 20 hours;

[0052] (3) Repeatedly rinse the precipitate obtained in step (2) with deionized water, then wash and filter the precipitate with absolute ethanol, dry the resulting ...

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Abstract

The invention relates to a preparation method of an anti-purple-halo transparent ceramic panel for replacing sapphires. A transparent ceramic is a cubic crystal system and comprises AlON based ceramics, Y2O3 based ceramics, Spinel based ceramics and YAG based ceramics. The preparation method of the transparent ceramic comprises the following steps: adding a certain amount of sintering additives, binding agents, dispersing agents, liquid media, grinding balls and / or rare earth oxides into ceramic powder, performing ball-milling, uniformly mixing, then performing tape casting molding, or performing slip casting molding, or performing gel casting molding, or performing injection molding, or performing dry-pressing molding to obtain a ceramic biscuit, degreasing a molded biscuit, and then sintering to obtain the ceramic; and performing annealing, polishing and anti-reflection film coating treatment on the obtained ceramic to obtain the transparent ceramic panel of which the transmittance is about 95%. The transparent ceramic panel disclosed by the invention does not need cutting processing, is easily-controllable in shape, can be used for simplifying a processing technique, also is short in ceramic production cycle, and ensures that the productivity can be improved and the cost can be reduced.

Description

technical field [0001] The invention relates to a preparation method of an anti-purple halo transparent ceramic panel for replacing sapphire, that is, a preparation method for protecting a cover plate of a display device, in particular to a method for replacing sapphire for an anti-purple anti-corrosion panel used in mobile phones, scanners, PADs, and watches. A preparation method of a purple halo transparent ceramic panel. Background technique [0002] Large-screen smartphones have driven the development of many new technologies, the most obvious of which is the screen material. At present, mainstream mobile phones and PADs on the market generally use Corning's Gorilla Glass cover, and recently sapphire glass screens have also been heated up. The Mohs hardness of the gorilla glass cover is only about 7, while the Mohs hardness of sapphire reaches 9, which is second only to the hardness of diamonds. It has good wear resistance, good heat resistance, light transmission and c...

Claims

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Application Information

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IPC IPC(8): C04B35/63
Inventor 胡宁宁黄运铨
Owner 中科皓烨(东莞)材料科技有限责任公司
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