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Preparation method for sheet aluminium oxide

A technology of flake alumina and alumina, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of molten salt toxicity, etc., and achieve the effects of good dispersion, regular shape, and simplified production steps

Inactive Publication Date: 2014-08-06
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of flaky α-alumina powder by the molten salt method can be carried out at a lower temperature, the reaction time is shorter, and the morphology is controllable, but some molten salts are toxic, and there are problems such as how to improve the uniformity of doping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 50g of Al(OH) with a particle size of 8μm 3 Put it into a mortar, add 0.5g of PEG surfactant and 16g of water, grind until uniform, and prepare Mixture 1, dry at about 105°C, and burn at 700°C. After burning, put the sample into the mortar again, add appropriate amount of 1g self-made crystal seed, 1.6g aluminum fluoride and water, continue grinding for a period of time, and then dry it again. Finally, move to silicon-molybdenum rod furnace and calcined at 1200°C for one hour to obtain flaky α-Al with a particle size of 100 μm 2 o 3 .

Embodiment 2

[0020] Weigh 50g of Al(OH) with a particle size of 2μm 3 Put it into a mortar, add 1g of PEG surfactant and 17g of water, grind until uniform, and prepare mixture 1, dry at about 110°C, and burn at 650°C. After burning, put the sample into the mortar again, add appropriate amount of 1.25g self-made crystal seeds, 1.6g aluminum fluoride and water, continue to grind for a period of time, and then dry it again. Finally, move to silicon molybdenum rod furnace, calcined at 1200°C for two hours to obtain flaky α-Al with a particle size of 50 μm 2 o 3 .

Embodiment 3

[0022] Weigh 150g of Al(OH) with a particle size of 2μm 3 Put it into a mortar, add 3.75g of PEG surfactant and 80g of water, grind until uniform, and prepare Mixture 1, dry at about 110°C, and burn at 600°C. After burning, put the sample into the mortar again, add an appropriate amount of 4.50g self-made crystal seeds, 4.8g aluminum fluoride and water, continue grinding for a period of time, and then dry it again. Finally, move to silicon-molybdenum rod furnace and calcined at 1200°C for one hour to obtain flaky α-Al with a particle size of 20 μm. 2 o 3 .

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Abstract

The invention discloses a preparation method for sheet aluminium oxide. Aluminium hydroxide powder with a certain granularity is added into a surface active agent and water for grinding until being uniform, dried and fired, so as to obtain gamma- aluminium oxide; then seed crystal, a mineralizing agent and water are added into the gamma- aluminium oxide for mixing evenly, after continuous grinding, drying can be performed again, and through final burning, hexagonal sheet gamma- aluminium oxide with the granularity ranging from 20 to 100 mum is obtained.

Description

technical field [0001] The invention relates to a method for preparing flaky alumina by a high-temperature solid-phase method, and belongs to the technical field of ceramic and pearlescent pigment alumina preparation techniques. Background technique [0002] Flaky α-alumina powder not only has high melting point, high hardness, good wear resistance, corrosion resistance, oxidation resistance and other properties of ordinary alumina, but also because its thickness can reach nanometer level, the size in the radial direction is micron The unique two-dimensional flake shape of the grade shows strong adhesion, light reflection ability and shielding effect. It is used as filler, pigment, toughening agent and refractory material in cosmetics, automotive topcoat, ceramics and polishing and other fields. . For example: the high thermal conductivity of alumina can be used as a filler to prepare electronic components in polymer-ceramic composites, which can greatly extend the service ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 赵燕禹张志鸿商连弟
Owner TIANJIN VOCATIONAL INST
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