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Preparation method of sphere-like alpha-phase nano aluminum oxide

A nano-alumina, spherical-like technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, nanotechnology, etc. The effect of mass production, reduced size, and simple process

Active Publication Date: 2020-08-04
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The preparation method of a spherical α-phase nano-alumina provided by the present invention uses industrial alumina as raw material, and prepares a spherical α-phase nano-alumina through grinding, adding additives, ultrasonication, pre-calcination, and calcination. Aluminum powder, and Na in alumina powder 2 The O content is less than 0.02%, which solves the problem that the existing technology cannot realize the nanonization and spherification of alumina powder at the same time

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preparation example Construction

[0036] A method for preparing spherical α-phase nano-alumina provided by the present invention comprises the following steps:

[0037] (a), ultrasonically treating the mixture of ground industrial alumina, water, ammonium citrate and ammonium fluoride to obtain alumina precursor slurry;

[0038] (b) performing solid-liquid separation on the alumina precursor slurry obtained in step (a), and drying the separated solid at 80-110°C to obtain a solid alumina precursor;

[0039] (c) Calcining the solid alumina precursor obtained in step (b) at 1200-1300° C. to obtain the spherical α-phase nano-alumina.

[0040] The preparation method provided by the present invention uses industrial alumina as a raw material, and prepares spherical α-phase nano-alumina powder by means of grinding, adding additives, ultrasonication, pre-calcination, calcination, etc., and the alumina powder Na 2 The O content is less than 0.02%, which solves the problem that the existing technology cannot simultan...

Embodiment 1

[0060] The preparation method of low-sodium spherical alpha-phase nano-alumina of the present invention comprises the following steps:

[0061] (1) Put industrial alumina raw materials into a planetary ball mill for ball milling, the medium of ball milling is zirconia balls, the diameter of zirconia balls is 1mm, and the grinding time is 3h;

[0062] (2) mixing the aluminum oxide prepared in step (1) with deionized water, the addition of deionized water is equivalent to 1 times the weight of industrial alumina, and it is made into a 50% aluminum oxide suspension;

[0063] (3) add composite additive to the alumina suspension that step (2) makes, the addition of ammonium citrate is 1% of alumina weight in the composite additive, and the addition of ammonium fluoride is 1% of alumina weight, Prepared as an alumina precursor;

[0064] (4) Reacting the alumina precursor prepared in step (3) under the action of ultrasound at a water bath temperature of 60° C. and a frequency of 80 ...

Embodiment 2

[0071] The preparation method of low-sodium spherical alpha-phase nano-alumina of the present invention comprises the following steps:

[0072] (1) put the industrial alumina raw material into a planetary ball mill for ball milling, the medium of the ball mill is a zirconia ball, the diameter of the zirconia ball is 2mm, and the grinding time is 5h;

[0073] (2) mixing the aluminum oxide prepared in step (1) with deionized water, the addition of deionized water is equivalent to 1 times the weight of industrial alumina, and it is made into a 50% aluminum oxide suspension;

[0074] (3) add composite additive to the alumina suspension that step (2) makes, the addition of ammonium citrate is 1% of alumina weight in the composite additive, and the addition of ammonium fluoride is 1% of alumina weight, Prepared as an alumina precursor;

[0075] (4) Reacting the alumina precursor prepared in step (3) under the action of ultrasound at a water bath temperature of 60° C. and a frequenc...

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Abstract

The invention provides a preparation method of sphere-like alpha-phase nano aluminum oxide. Industrial aluminum oxide is used as a raw material, sphere-like alpha-phase nanometer aluminum oxide powderis prepared through grinding, additive adding, ultrasonic treatment, presintering, calcining and other treatment means, the content of Na2O in the aluminum oxide powder is smaller than 0.02%, and theproblems that in the prior art, aluminum oxide powder nanocrystallization and spheroidization cannot be achieved at the same time are solved. And the method has the advantages of simple process, lowproduction cost, environmental friendliness, suitability for large-scale production and the like. The prepared sphere-like alpha-phase nano aluminum oxide powder can be used in the fields of functional ceramics, precision polishing materials, semiconductor materials and the like.

Description

technical field [0001] The invention relates to the technical field of preparation methods of alumina powder, in particular, to a preparation method of spherical α-phase nano-alumina. Background technique [0002] The chemical properties of α-phase alumina are very stable. At the same time, it has the advantages of high hardness, high strength, good wear resistance, strong insulation performance and high resistivity. It is widely used in the fields of refractory materials, ceramic materials and diaphragm materials. With the further development of science and technology, there are higher requirements for the properties of alumina, such as small particle size, higher purity, and environmental protection in the preparation process. In addition, the particle morphology of α-phase alumina is also an important factor affecting its performance. Compared with micron-sized irregular alumina particles, nano-scale spherical alumina particles have larger specific surface area, better fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y40/00
CPCB82Y40/00C01F7/021C01P2002/72C01P2004/03C01P2004/32C01P2006/80
Inventor 毕科张家萌毕作振吴宇峰雷鸣
Owner BEIJING UNIV OF POSTS & TELECOMM
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