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Gas phase process of preparing nanometer alumina particle

A nano-alumina and nano-particle technology, applied in the direction of alumina/aluminum hydroxide, can solve the problems of difficult removal of impurity ions and inability to prepare high-purity nano-alumina powder, and achieve low equipment cost and simple process Effect

Inactive Publication Date: 2007-11-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] These methods have to go through complex processes such as precipitation, filtration, cleaning, drying, and calcination, and the impurity ions in it are difficult to completely remove, and high-purity nano-alumina powder cannot be prepared.

Method used

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  • Gas phase process of preparing nanometer alumina particle

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Effect test

Embodiment 1

[0020] After the aluminum isopropoxide is vaporized, it is brought into the combustion chamber with air, burned with hydrogen and undergoes hydrolysis reaction. After the generated aluminum oxide nanoparticles are cooled, they can be directly collected by a bag filter to obtain the product nanoparticles. Control the flow rate of aluminum isopropoxide, carrier gas and hydrogen entering the combustion reactor, keep the mol ratio of raw materials at aluminum isopropoxide: hydrogen: air=1: 0.2: 80, the temperature of combustion reaction is at 600 ℃, and be cooled to 150°C, enter the bag filter to collect the product nanoparticles.

[0021] The obtained product nanoparticles have a particle size of 7nm and a specific surface area of ​​416m 2 / g, with a purity of 99.9%, presenting a typical chain-like and networked aggregated structure, its morphology is shown in Figure 1.

Embodiment 2

[0023] After the aluminum isopropoxide is vaporized, it is brought into the combustion chamber with air, burned with hydrogen and undergoes hydrolysis reaction. After the generated aluminum oxide nanoparticles are cooled, they can be directly collected by a bag filter to obtain the product nanoparticles. Control the flow rate of aluminum isopropoxide, carrier gas and hydrogen entering the combustion reactor, keep the mol ratio of raw materials at aluminum isopropoxide: hydrogen: air=1: 1.5: 40, the temperature of combustion reaction is at 1200 ℃, and be cooled to 300°C, enter the bag filter to collect the product nanoparticles.

[0024] The obtained product nanoparticles have a particle size of 30nm and a specific surface area of ​​67m 2 / g, with a purity of 99.9%, presenting a typical chain and network agglomeration structure, its morphology is shown in Figure 2.

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Abstract

The gas phase process of preparing nanometer alumina particle includes the following steps: burning gasified and air carried aluminum isopropoxide with hydrogen in a combustion chamber, hydrolysis to produce nanometer alumina particle, cooling and collecting nanometer alumina particle product. The process has no pollutant exhaustion, and is simple, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing nano-alumina particles by gas phase method, in particular to a method for preparing high-purity nano-alumina particles. Background technique [0002] Nano-alumina is widely used, such as making heat-resistant materials, missile windows and high-pressure sodium lamp tube materials, computer integrated circuit substrates, wear-resistant materials and bioceramic materials, catalysts and catalyst carriers, and anti-light weapons at the bottom of aviation armed helicopters. Armor, ceramic blades for mechanical cutting, artificial gemstone raw materials, composite ceramics, low-temperature plastic ceramics, anti-fouling, dust-proof, wear-resistant and fire-resistant nano-ceramic coatings, sunscreen skin care products, organic polymer materials and hard dispersed phases of inorganic materials, Catalysts for automobile exhaust purifiers require a large amount of nano-alumina powder, which is the most widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 胡彦杰刘杰李春忠
Owner EAST CHINA UNIV OF SCI & TECH
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