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Preparation method of high-precision aluminum oxide polishing powder

An alumina polishing powder, high-precision technology, applied to the polishing composition containing abrasives, etc., can solve the requirements of the particle size of the polishing material, the roughness of the surface of the workpiece without polishing powder polishing rate, etc., to shorten the sintering time, improved polishing performance, and good dispersibility

Active Publication Date: 2015-03-11
包头市华辰稀土材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this invention does not propose requirements to the polishing rate of the polishing powder and the surface roughness of the workpiece after polishing
[0005] For example, CN 1398939 discloses a polishing composition, which is an abrasive containing at least silicon oxide and aluminum oxide, but there is no requirement for the particle size of the polishing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take Al(NO 3 ) 3 9H 2 O solid 110g, 184.2g / l cerium nitrate solution 3ml, mass fraction 30% silica sol 83g, titanium oxide powder 0.55g, absolute ethanol solution 80ml, cetyltrimethylammonium bromide 0.2g. First pour the silica sol into the ethanol solution and shake well, then take 200ml of deionized water to dissolve the aluminum nitrate solid, pour the cerium nitrate solution into it and shake well, then add titanium oxide powder. Finally, deionized water was added to the solution to 400 ml, and 0.2 g of dispersant cetyltrimethylammonium bromide was added at the same time. The above solution is spray-dried by a spray dryer to obtain a powder, which is then calcined. First pre-fire the powder particles at a temperature of 200 ° C, keep it warm for 1 hour, then raise the temperature to 1150 ° C, calcine and keep it warm for 2 hours, and then cool down with the furnace to obtain α-alumina polishing powder. The D of the powder is 50 The central particle size is 1.473...

Embodiment 2

[0026] Take Al(NO 3 ) 3 9H 2 O solid 110g, 184.2g / l cerium nitrate solution 3ml, mass fraction 30% silica sol 83g, titanium oxide powder 0.55g, absolute ethanol solution 80ml, cetyltrimethylammonium bromide 0.2g. First pour the silica sol into the ethanol solution and shake well, then take 200ml of deionized water to dissolve the aluminum nitrate solid, pour the cerium nitrate solution into it and shake well, then add titanium oxide powder. Finally, deionized water was added to the solution to 400 ml, and 0.3 g of dispersant cetyltrimethylammonium bromide was added at the same time. The above solution is spray-dried by a spray dryer to obtain a powder, which is then calcined. First pre-fire the powder particles at a temperature of 250°C, keep it warm for 1.5h, then raise the temperature to 1250°C, calcine and keep it warm for 4h, and then cool down with the furnace to obtain α-alumina polishing powder. The D of the powder is 50 The central particle size is 1.032 μm. In th...

Embodiment 3

[0028] Take Al(NO 3 ) 3 9H 2O solid 90g, 184.2g / l cerium nitrate solution 4ml, mass fraction 30% silica sol 88g, titanium oxide powder 0.74g, absolute ethanol solution 80ml, sodium polymetaphosphate 0.2g. First pour the silica sol into the ethanol solution and shake well, then take 200ml of deionized water to dissolve the aluminum nitrate solid, pour the cerium nitrate solution into it and shake well, then add titanium oxide powder. Finally, deionized water was added to the solution to 400 ml, and 0.2 g of dispersant cetyltrimethylammonium bromide was added at the same time. The above solution is spray-dried by a spray dryer to obtain a powder, which is then calcined. First pre-fire the powder particles at a temperature of 300°C, keep it warm for 2 hours, then raise the temperature to 1350°C, calcine and keep it for 5 hours, and then cool down with the furnace to obtain α-alumina polishing powder. The D of the powder is 50 The central particle size is 0.932 μm. In the exp...

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Abstract

The invention discloses a preparation method of high-precision aluminum oxide polishing powder. The polishing powder is used as an abrasive material, and mainly contains aluminum oxide, silicon oxide, cerium oxide and titanium oxide. The Al2O3:SiO2 ratio is 12:1-8:3, and the CeO2:TiO2 ratio is 1:1-3:1. In order to enhance the polishing effect, the dispersing agent is added in the synthesis and preparation process, so that the prepared aluminum oxide polishing powder can be utilized to obtain a favorable polished and ground surface. The preparation method comprises the following steps: thoroughly mixing aluminum nitrate, silica sol, cerium nitrate, titanium oxide powder and a dispersing agent, carrying out spray drying, and roasting to obtain the aluminum oxide polishing powder. The aluminum oxide polishing powder has the advantages of favorable suspensibility, favorable dispersity, narrow particle size distribution, high smoothness of the polished and ground surface, high polishing capacity and long service life.

Description

technical field [0001] The invention belongs to the field of inorganic powder preparation, and in particular relates to a preparation method of high-precision α-alumina polishing powder. The prepared α-alumina polishing powder has high polishing precision and extremely small central particle size, narrow particle size distribution. Background technique [0002] In recent years, domestic demand for α-alumina has become increasingly strong, mainly because the glass screens in the high-end mobile phone market currently use sapphire glass. The glass supplier in the Chinese mobile phone market is mainly American Corning, and the main mobile phone users of sapphire glass As we all know, they are high-end mobile phone manufacturers such as Xiaomi, Lenovo, Huawei, Samsung, LG, Apple, etc. This stimulated domestic research on sapphire glass polishing powder. [0003] α-alumina is a polishing material with extremely high hardness, its hardness is 8.8, and it is widely used in the po...

Claims

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Application Information

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IPC IPC(8): C09G1/02
CPCC09G1/02
Inventor 李梅周国祥张晓伟张存瑞柳召刚胡艳宏韩磊
Owner 包头市华辰稀土材料有限公司
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