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Preparation method of ultrafine alpha-Al2O3 powder

A technology of ultra-fine powder and powder, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of low concentration of reaction materials, poor powder dispersibility, wide particle size distribution, etc., to achieve the suppression of particle agglomeration, increase in production, Strengthen the effect of steric hindrance effect

Active Publication Date: 2015-09-09
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the existing production of ultra-fine α-Al 2 o 3 In the powder process, the reaction material concentration is low, the product yield is low and ultrafine α-Al 2 o 3 Due to the technical problems of poor powder dispersibility and wide particle size distribution, the present invention provides an ultra-fine α-Al powder that is energy-saving, environmentally friendly, stable in quality, very significant in economic benefits, and suitable for industrial production 2 o 3 Preparation method of powder

Method used

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  • Preparation method of ultrafine alpha-Al2O3 powder
  • Preparation method of ultrafine alpha-Al2O3 powder

Examples

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Embodiment 1

[0039] an α-Al 2 o 3 The preparation method of superfine powder, comprises steps as follows:

[0040] (1) Preparation of Basic Aluminum Ammonium Carbonate Precursor

[0041] 1. Get 13.254kg of ammonium bicarbonate solid particles and 17.764kg of aluminum ammonium sulfate solid particles as raw materials, fully mix the two raw materials, add 6.204kg of water in the reactor as the reaction bottom liquid, and add 163.98g of polyethylene glycol 600, pass The synergistic effect of high-speed mechanical stirring and ultrasonic dispersion will mix the reaction materials evenly, and generate a suspension of the basic ammonium aluminum carbonate precursor after reacting at -20-20°C for 3 hours;

[0042] ② Hydraulically filter the suspension of the obtained ammonium basic aluminum carbonate precursor, wash the filter cake with water and dry it in a vacuum oven at 80°C for 8 hours to obtain the basic ammonium aluminum carbonate precursor powder;

[0043] The XRD figure and the SEM fig...

Embodiment 2

[0050] an α-Al 2 o 3 The preparation method of superfine powder, comprises steps as follows:

[0051] (1) Preparation of basic ammonium aluminum carbonate precursor: as described in Example 1, the difference is 1.: get 13.195kg ammonium bicarbonate solid particles and 17.823kg aluminum ammonium sulfate solid particles as raw materials, and the reaction time is 4h;

[0052] (2) Calcination of basic ammonium aluminum carbonate precursor: as described in Example 1;

[0053] (3) sanding: same as embodiment 1, the difference is that the sanding time is 2h.

Embodiment 3

[0055] an α-Al 2 o 3 The preparation method of superfine powder, comprises steps as follows:

[0056] (1) Preparation of basic aluminum ammonium carbonate precursor: as described in Example 1, the difference is ①: the addition of polyethylene glycol 600 is 21.86g;

[0057] (2) Calcination of basic aluminum ammonium carbonate precursor: put the basic aluminum ammonium carbonate precursor powder in a high-temperature furnace, raise the temperature to 1250°C at a heating rate of 5°C / min, and keep at this temperature for 50min;

[0058] (3) sanding: same as embodiment 1, the difference is that the sanding time is 2h.

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Abstract

The invention belongs to the field of inorganic nonmetallic materials, and particularly relates to a preparation method of ultrafine alpha-Al2O3 powder. The preparation method of the ultrafine alpha-Al2O3 powder comprises the following steps of using solid powder of aluminum salt and ammonium salt as raw materials; uniformly mixing reaction materials by a synergistic effect of high-speed mechanical stirring and ultrasonic dispersion; synthesizing the reaction materials into ammonium aluminum carbonate hydroxide through chemical reaction; using the ammonium aluminum carbonate hydroxide as a precursor; and preparing the ultrafine alpha-Al2O3 powder through roasting and mechanical grinding. The obtained ultrafine alpha-Al2O3 powder is high in dispersibility and fine in granularity; diameters of particles are 100-200 nanometers; grain fineness distribution is narrow; and particle volume distribution is as follows: D50= 0.2 micrometer, and D90= 0.42 micrometer. In a whole preparation technological process, conditions are gentle, the technology is easy to control, energy-saving and environment-friendly, the quality of ultrafine powder is stable, and the ultrafine alpha-Al2O3 is suitable to be produced in batches.

Description

technical field [0001] The present invention relates to ultrafine α-Al 2 o 3 The preparation method of powder belongs to the field of inorganic non-metallic materials. Background technique [0002] α-Al 2 o 3 It is an inorganic non-metallic material with a wide range of uses, but since ordinary alumina powder is prepared from bauxite, its particle size, particle shape and particle size distribution limit the scope of use and product performance. Ultrafine α-Al 2 o 3 Powder is widely used in many high-tech fields because of its small particle size, high specific surface area, uniform particle size, strong thermal stability, high hardness, corrosion resistance, high temperature resistance, wear resistance and other excellent physical and chemical properties, such as: It is used in the manufacture of ceramic and composite ceramic materials, electronic materials, surface protection materials, optical materials, and biological and medical materials. In order to further imp...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 焦秀玲王夏梦张立陈代荣
Owner SHANDONG UNIV
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