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Process for preparing high purity flake alpha-Al2O3 and its super fine powder

An ultra-fine powder and flake technology, which is applied in the field of preparation of high-purity flake α-Al2O3 and its ultra-fine powder, can solve the problems of complex process and difficulty in preparing high-purity flake α, etc.

Inactive Publication Date: 2007-04-11
LIANYUNGANG LIANLIAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The process of hydrothermal or alcohol thermal synthesis is relatively complicated, and it is difficult to prepare high-purity flake α-Al by ball milling 2 o 3

Method used

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  • Process for preparing high purity flake alpha-Al2O3 and its super fine powder
  • Process for preparing high purity flake alpha-Al2O3 and its super fine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) The analytically pure aluminum nitrate nonahydrate is mixed with soluble starch and other qualities, and ground uniformly at room temperature;

[0017] (2) Put the evenly ground material directly into a drying oven at 150°C and heat for 30 minutes to obtain a yellow fluffy product;

[0018] (3) Incubate the yellow fluffy product at 1000°C for 2 hours to obtain high-purity flake α-Al 2 O 3 ;

[0019] (4) 100 parts by mass of the high-purity flaky α-Al obtained above 2 O 3 , adding 500 parts by mass of anhydrous ethanol, and ball milling with a common ball mill for 24 hours; the slurry was directly dried at 80 ° C to obtain high-purity ultra-fine flake α-Al with an average particle size of 0.35 μm 2 O 3 .

Embodiment 2

[0021] (1) analytically pure aluminum nitrate nonahydrate and tapioca starch are mixed, and ground uniformly at room temperature;

[0022] (2) Put the evenly ground material directly into a drying oven at 150°C and heat for 30 minutes to obtain a yellow fluffy product;

[0023] (3) Incubate the yellow fluffy product at 1200°C for 1 hour to obtain high-purity flake α-Al 2 O 3 .

[0024] (4) 100 parts by mass of the high-purity flaky α-Al obtained above 2 O 3 , adding 600 parts by mass of anhydrous ethanol, and ball milling with a common ball mill for 24 hours; the slurry was directly dried at 80 ° C to obtain high-purity ultra-fine flake α-Al with an average particle size of 0.5 μm 2 O 3 .

Embodiment 3

[0026] (1) The analytically pure aluminum nitrate nonahydrate is mixed with the same quality as gum arabic, and ground uniformly at room temperature;

[0027] (2) Put the evenly ground material directly into a drying oven at 150°C and heat for 30 minutes to obtain a yellow fluffy product;

[0028] (3) Incubate the yellow fluffy product at 1000°C for 2 hours to obtain high-purity flake α-Al 2 O 3 .

[0029] (4) 100 parts by mass of the high-purity flaky α-Al obtained above 2 O 3 , adding 500 parts by mass of anhydrous ethanol, and milling with a common ball mill for 24 hours; the slurry was directly dried at 80 °C to obtain high-purity ultra-fine flake α-Al with an average particle size of 0.4 μm 2 O 3 .

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Abstract

The process of preparing high purity flaky alpha-Al2O3 and its superfine powder includes the following steps: 1. mixing analytic pure aluminum nitrate nonahydrate and water soluble polymer in the same weight, and grinding at room temperature to homogenize; 2. heating the mixture in a dryer at 150 deg.C for 30 min to obtain puffed yellow product; 3. maintaining at 1000-1200 deg.C for 1-2 hr to obtain high purity flaky alpha-Al2O3; and 4. mixing high purity flaky alpha-Al2O3 in 100 weight and anhydrous alcohol in 500-800 weight portions, ball milling for 24-48 hr, stoving at 80-100 deg.C to obtain superfine high purity flaky alpha-Al2O3 powder of 0.17-0.8 micron average particle size. The present invention has low cost, simple technological process, and high product purity.

Description

technical field [0001] The present invention relates to a kind of high-purity flaky α-Al 2 O 3 And the preparation method of ultrafine powder. Background technique [0002] Flake alumina has many excellent properties such as acid and alkali resistance, high temperature resistance, high hardness, high melting point, high thermal conductivity and high electrical resistivity; mechanical strength. Therefore, it can be widely used in many fields such as pigments, coatings, cosmetics, automotive topcoats, inks, fillers and abrasives. [0003] The most common method for preparing flaky alumina is hydrothermal or alcoholic thermal synthesis. The flaky alumina prepared by hydrothermal method is characterized in that it has a thin plate-like structure and a uniform shape; it has good orientation in solution so that it can maintain a stable dispersion state. But under hydrothermal conditions, α-Al 2 O 3 The phase transition temperature of the crystal is relatively high (>400°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/30
Inventor 刘志锋李继彦吴伯麟
Owner LIANYUNGANG LIANLIAN CHEM CO LTD
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