Method for preparing nanometer alumina powder

A nano-alumina and nano-alumina technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problem of difficulty in preparing nano-scale alumina powder, etc., and achieve a wide adjustable range of process parameters, low synthesis temperature, and high reaction efficiency. Ease of process effect

Inactive Publication Date: 2007-05-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

Japanese patent JP2001019425 discloses a method for preparing spherical alumina. Aluminum hydroxide is used as a raw material to make an aqueous slurry with a concentration of 20mass%, which is decomposed by flame spraying at 773K to form alumina powder. Aluminum powder has good sphericity, but the particle size is usually several microns, so it is difficult to produce nano-sized alumina powder

Method used

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Embodiment 1

[0033]First, polyacrylamide (C.R.), polyvinyl alcohol (C.R.) and polyethylene glycol (C.R.) were dissolved in deionized water at a molar ratio of 1:1:1 to prepare a dispersion with a concentration of 0.1mol / L; Aluminum nitrate (Al(NO 3 ) 3 ·6H 2 O) Dissolved in deionized water to prepare an aluminum-containing reaction solution with a concentration of 1mol / L; add the dispersion liquid to the aluminum-containing reaction solution at a volume ratio of 1:10, and vigorously stir to form a uniform aluminum-containing dispersion mixed solution ; Then urea ((NH 2 ) 2 CO) and ammonia (NH 3 ·H 2 O) be dissolved in deionized water and dilute with the molar ratio of 0.1: 10, make the alkaline reaction solution that molar concentration is 1mol / L; Stir to form a uniform alkaline dispersion mixed solution; according to [Al 3+ ] ion and [OH - ] The molar ratio of ions is the ratio of 1: 3, the aluminum-containing dispersion mixed solution is slowly added to the alkaline dispersion so...

Embodiment 2

[0035] First, polyacrylamide (C.R.), polyvinyl alcohol (C.R.) and polyethylene glycol (C.R.) were dissolved in deionized water at a molar ratio of 10:1:1 to prepare a dispersion with a concentration of 0.001mol / L; Aluminum nitrate (Al(NO 3 ) 3 ·6H 2 O) Dissolve in deionized water to prepare an aluminum-containing reaction solution with a concentration of 0.1mol / L; add the dispersion liquid to the aluminum-containing reaction solution at a volume ratio of 1:50, and vigorously stir to form a uniform aluminum-containing dispersion and mix solution; then urea (NH 2 ) 2 CO) and ammonia (NH 3 ·H 2 O) be dissolved in deionized water and dilute with the molar ratio of 3: 10, make the alkaline reaction solution that molar concentration is 0.1mol / L; Then according to the ratio of volume ratio 1: 50, dispersion liquid is added in the alkaline reaction solution, Stir vigorously to form a uniform alkaline dispersion mixed solution; according to [Al 3+ ] ion and [OH - ] The molar ra...

Embodiment 3

[0037] First, polyacrylamine (C.R.), polyvinyl alcohol (C.R.) and polyethylene glycol (C.R.) were dissolved in deionized water at a molar ratio of 10:10:1 to make a dispersion with a concentration of 1mol / L; then Aluminum nitrate (Al(NO 3 ) 3 ·6H 2 O) Dissolved in deionized water to prepare an aluminum-containing reaction solution with a concentration of 10.0 mol / L; add the dispersion liquid to the aluminum-containing reaction solution at a volume ratio of 1:50, and vigorously stir to form a uniform aluminum-containing dispersion and mix solution; then urea ((NH 2 ) 2 CO) and ammonia (NH 3 ·H 2 O) be dissolved in deionized water and dilute with the molar ratio of 0.1: 10, make the alkaline reaction solution that molar concentration is 6.0mol / L; Then according to the ratio of volume ratio 1: 50, dispersion liquid is added in the alkaline reaction solution, Stir vigorously to form a uniform alkaline dispersion mixed solution; according to [Al 3+ ] ion and [OH - ] The mol...

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Abstract

The invention discloses a preparing method of alumina nanometer powder, which comprises the following steps: adding organic dispersant solution in the initial reacting solution; forming even aluminium dispersing reacting solution and alkaline dispersing reacting solution; adding aluminium dispersing reacting solution in the alkaline dispersing reacting solution; proceeding ultrasonic chemical reaction; obtaining slurry suspension; washing slurry suspension through ultrasound; drying; proceeding heat disposal to obtain the alumina nanometer powder.

Description

technical field [0001] The invention relates to a preparation method of aluminum oxide nano powder. technical background [0002] Nano-alumina powder is a particle with a particle size in the range of 1nm to 100nm. Alumina has the advantages of high hardness, high strength, high temperature resistance, corrosion resistance, etc. Nano-alumina has more excellent physical and chemical properties, so it is widely used in fine ceramics, composite materials, electronics industry, metallurgy and chemical industry and other fields[ 119]. With the continuous development of high technology, the requirements for materials are getting higher and higher, such as ultra-fine particle size, uniform particle size, high purification of components, low-temperature environmental protection in the preparation process, etc. With its surface effect, quantum size effect and volume effect, nanomaterials have brought the field of materials into a new stage of development. There are many methods to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 谭强强齐智平童建忠
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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