Method for preparing completely dispersed alpha aluminum oxide nano particles

A technology of α-alumina and nano-particles, which is applied in the field of inorganic materials, can solve the problems of large particle size, high phase transition temperature, and poor dispersion, and achieve the effect of small size, low calcination temperature, and good dispersion

Active Publication Date: 2014-02-12
LANZHOU UNIVERSITY
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  • Abstract
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Problems solved by technology

[0007] The present invention provides a method for dispersing α-alumina nanoparticles prepared by a chemical precipitation method, aiming to solve the problems of high phase transition temperature, large particle size and poor dispersion in the preparation process of α-alumina nanoparticles in the prior art. question

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  • Method for preparing completely dispersed alpha aluminum oxide nano particles
  • Method for preparing completely dispersed alpha aluminum oxide nano particles

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Experimental program
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Effect test

Embodiment 1

[0017] According to the molar ratio of iron ions and aluminum ions at 5:1 and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 620 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.

[0018] The obtained α-alumina nanoparticles have an average particle size of 14 nm, a particle size distribution of ...

Embodiment 2

[0020] According to the molar ratio of iron ions and aluminum ions at 5:1 and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 660 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.

[0021] The obtained α-alumina nanoparticles have an average particle size of 23 nm, a particle size distribution of ...

Embodiment 3

[0023] According to the molar ratio of iron ions and aluminum ions at 7:1, and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed, and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 660 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.

[0024] The obtained α-alumina nanoparticles have an average particle size of 25 nm, a particle size distribution o...

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Abstract

The invention discloses a method for preparing completely dispersed alpha aluminum oxide nano particles. The preparation method adopts a chemical precipitation method, and comprises the following steps of firstly dissolving ferric nitrate and aluminum nitrate in water, wherein the proportion of the ferric nitrate to the aluminum nitrate is based on a molar ratio of iron ions to aluminum ions of 5: 1-9: 1; regulating pH value to be 6-9; filtering, washing, drying and precipitating so as to obtain a precursor; calcining the precursor for 0-30 hours at 620-800 DEG C so as to obtain the calcinated product of alpha aluminum oxide and alpha ferric oxide; and removing alpha ferric oxide and other impurities in the calcinated product through acid etching so as to obtain the completely dispersed alpha aluminum oxide nano particles. The method has the advantages that the raw materials are cheap, the technology is simple, and the calcining temperature is low, and the prepared alpha aluminum oxide nano particle are small in size, good in dispersibility, and expected to be used in industry in large scale.

Description

technical field [0001] The present invention relates to an inorganic material, especially a method for preparing inorganic nanoparticles. Specifically, the present invention relates to a method for preparing completely dispersed α-alumina nanoparticles. Background technique [0002] α-alumina (commonly known as corundum) nanoparticles can provide high-quality raw materials for the preparation of alumina nano-ceramics, which is expected to solve the fatal problem of brittleness of alumina ceramics, making alumina ceramics as structural materials, high-temperature materials, biomedical materials, electronics Ceramic components and the like have wider applications. At the same time, α-alumina nanoparticles are dispersed in the paint and sprayed on the surface of hard alloy, glass, plastic, etc., which can also greatly improve the hardness, wear resistance and corrosion resistance of the material. [0003] The smaller the size of α-alumina nanoparticles, the better the dispersi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y40/00
Inventor 李建功曹文斌蒲三旭郭瑞雲马骥
Owner LANZHOU UNIVERSITY
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