Method of preparing good dispersion and high-purity ultra-fine alpha-Al2O3

Inactive Publication Date: 2007-02-28
DALIAN LUMING SCI & TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The methods disclosed in these two patents are relatively convenient to implement and can produce high-purity products. However, during the production process of this method, alkoxide hydrolysis is easy to form hydrogen bonds, resulting in hard agglomeration, and the alumina precursor produced needs to be processed at high temperature. It can be transformed into α-Al only after burning 2 o 3 , hard agglomeration is also very easy to occur during the burning process, and it is difficult to produce high-quality ultrafine α-Al with good dispersion 2 o 3 powder
In this regard, there are many studies to control the agglomeration of powder by improving the hydrolysis process of aluminum alkoxide. The Chinese patent "High-purity ultra-fine dispersed spherical Al 2 o 3 Preparation method of powder", applicati

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  • Method of preparing good dispersion and high-purity ultra-fine alpha-Al2O3

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: In a 1-liter three-necked flask, add 500 g of isopropanol solution with a mass concentration of 50% aluminum isopropoxide, place it in a water bath at 70° C., add 20 g of lauric acid as an additive while stirring, and continue stirring Mix well, then drop 80 g of isopropanol solution with a mass concentration of 75% deionized water while stirring, let stand for 10 hours after the reaction is completed, and filter for later use. The alumina precursor obtained after filtration is placed in a ball mill cylinder, and 2.5g a-Al is added at the same time 2 o 3 As a seed crystal and 20g of analytically pure ammonium citrate as an additive, an appropriate amount of deionized water was added as a dispersion medium and high-purity alumina balls were used as a ball milling medium, and ball milled for 5 hours, then dried in an oven at 70°C. The dried aluminum hydroxide is burned in a box furnace at 1050°C for 5 hours to obtain a-Al 2 o 3 Powder, the average particle s...

Embodiment 2

[0019] Example 2: In a 1-liter three-necked flask, add 500 g of isopropanol solution with a mass concentration of 50% aluminum isopropoxide, place it in a water bath at 70° C., and add 20 g of polyethylene glycol 200 as an additive while stirring , continue to stir and fully mix, and then drip 80 g of isopropanol solution whose mass concentration is 75% deionized water while stirring, let stand for 10 hours after the reaction is completed, and filter for subsequent use. The alumina precursor obtained after filtering is placed in a ball mill cylinder, and 2.5g a-Al is added 2 o 3 As a seed crystal and 20g of analytically pure ammonium carbonate as an additive, an appropriate amount of deionized water was added as a dispersion medium and high-purity alumina balls were used as a ball milling medium, and ball milled for 5 hours, then dried in an oven at 60°C. The final aluminum hydroxide is burned in a box furnace at 1050°C for 5 hours to obtain a-Al 2 o 3 Powder, the average p...

Embodiment 3

[0020] Example three: In a 1-liter three-neck flask, add 500 g of isopropanol solution with a mass concentration of 50% aluminum isopropoxide, place it in a water bath at 70° C., and add 20 g of Tween-80 as an additive while stirring, Continue to stir and mix thoroughly, then drop 80 g of isopropanol solution with a mass concentration of 75% deionized water while stirring, let stand for 10 hours after the reaction is completed, and filter for later use. The alumina precursor obtained after filtering is placed in a ball mill cylinder, and 2.5g a-Al is added 2 o 3 As crystal seeds and 20g of analytically pure ammonium nitrate as additives, at the same time add appropriate amount of deionized water as dispersion medium and high-purity alumina balls as ball milling medium, ball mill for 5 hours, then dry in an oven at 75°C, and dry The final aluminum hydroxide is burned in a box furnace at 1050°C for 6 hours to obtain a-Al 2 o 3 Powder, the average particle size is 120nm.

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Abstract

The invention discloses a preparing method of excellent dispersing high-pure ultra-fine alpha-Al2O3, which comprises the following steps: adopting analytic pure aluminium-alcohol salt hydrating reaction; balling; drying; sintering; adding one carboxyl acid or surface activator in the dehydrating course; adding alpha-Al2O3 seed and additive ammonium salt in the balling course.

Description

technical field [0001] What the present invention relates to is a kind of α-Al 2 o 3 preparation method, especially a kind of good dispersibility, high-purity ultra-fine α-Al 2 o 3 method of preparation. Background technique [0002] Due to its high purity and small particle size, high-purity ultra-fine alumina powder shows optical, electrical, magnetic, thermal and mechanical properties that conventional materials do not have, so it is widely used as a new functional material in optics, chemical industry and Special ceramics and many other fields. However, the alumina powder usually prepared by the liquid phase method needs to be converted into α-Al at high temperature. 2 o 3 , and the precursor is prone to agglomeration after high-temperature calcination, the specific surface area decreases sharply, and the average particle size increases sharply. It is difficult to obtain high-quality ultrafine powder with good dispersibility. Therefore, how ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/36
Inventor 王细凤罗昔贤肖志国肖志强
Owner DALIAN LUMING SCI & TECH GROUP
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