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Method for preparing mullite powder

A mullite powder and solution technology, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of complex process, high equipment requirements, poor repeatability, etc., achieve uniform particle size distribution, broad development prospects, and short reaction cycle Effect

Inactive Publication Date: 2011-06-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods either have high requirements on equipment, and the equipment and instruments are relatively expensive; or the utilization rate of raw materials is very small; or the process is complex, the preparation cycle is long, and the repeatability is poor.

Method used

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  • Method for preparing mullite powder
  • Method for preparing mullite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0015] 1) First, take 10ml tetraethyl orthosilicate and dissolve it in analytically pure ethanol solution, then add distilled water to it to obtain solution A, wherein the volume ratio of tetraethyl orthosilicate: ethanol: distilled water is 1: 4: 4, use Adjust the pH value of solution A with hydrochloric acid to 2, then place solution A adjusted with hydrochloric acid in a beaker sealed with a plastic wrap, and magnetically stir at room temperature to prehydrolyze ethyl orthosilicate to obtain mixed solution B;

[0016] 2) Then, take analytically pure Al(NO 3 ) 3 9H 2 O is put into a beaker, and 20ml of distilled water is added to the beaker, and the Al(NO 3 ) 3 9H 2 O is completely dissolved to give Al(NO 3 ) 3 9H 2 O solution;

[0017] 3) Al(NO 3 ) 3 9H 2 O solution and solution B are mixed and placed in an ultrasonic reactor for reaction. The power of the ultrasonic reactor is 300W, the temperature of the water bath is 80°C, and the irradiation time is 2h. Stir ...

Embodiment 2

[0021] 1) First, take 8ml tetraethyl orthosilicate and dissolve it in analytically pure ethanol solution, then add distilled water therein to obtain solution A, wherein the volume ratio of tetraethyl orthosilicate: ethanol: distilled water is 1: 4: 3, use Adjust the pH value of solution A with hydrochloric acid to 3, then place solution A adjusted with hydrochloric acid in a beaker sealed with plastic wrap, and magnetically stir at room temperature to prehydrolyze ethyl orthosilicate to obtain mixed solution B;

[0022] 2) Then, take analytically pure Al(NO 3 ) 3 9H 2 O is put into a beaker, and 15ml of distilled water is added to the beaker, and the Al(NO 3 ) 3 9H 2 O is completely dissolved to give Al(NO 3 ) 3 9H 2 O solution;

[0023] 3) Al(NO 3 ) 3 9H 2 O solution and solution B are mixed and placed in an ultrasonic reactor to react. The power of the ultrasonic reactor is 400W, the temperature of the water bath is 70°C, and the irradiation time is 3h. Stir for 4...

Embodiment 3

[0027] 1) First, take 5ml tetraethyl orthosilicate and dissolve it in analytically pure ethanol solution, then add distilled water to it to obtain solution A, wherein the volume ratio of tetraethyl orthosilicate: ethanol: distilled water is 1: 4: 2, use Adjust the pH value of solution A with hydrochloric acid to 4, then place solution A adjusted with hydrochloric acid in a beaker sealed with plastic wrap, and magnetically stir at room temperature to prehydrolyze ethyl orthosilicate to obtain mixed solution B;

[0028] 2) Then, take analytically pure Al(NO 3 ) 3 9H 2 O is put into a beaker, and 10ml of distilled water is added to the beaker, and the Al(NO 3 ) 3 9H 2 O is completely dissolved to give Al(NO 3 ) 3 9H 2 O solution;

[0029] 3) Al(NO 3 )3 9H 2 O solution and solution B are mixed and placed in an ultrasonic reactor for reaction. The power of the ultrasonic reactor is 500W, the temperature of the water bath is 60°C, and the irradiation time is 4h. Stir for 6...

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Abstract

The invention relates to a method for preparing mullite powder, and the method comprises the following steps: dissolving tetraethyl orthosilicate in ethanol solution, further adding distilled water into the solution, using hydrochloric acid for regulating pH value to be 2-4, and then carrying out magnetic stirring, thereby obtaining mixed solution; then dissolving Al(NO3)3.9H2O in the distilled water; adding the Al(NO3)3.9H2O solution into the mixed solution, carrying out the magnetic stirring, mixing evenly, then using ammonia for regulating the pH value to be 4.5-5.5, placing in a baking oven for obtaining a dried gel, placing the dried gel in a hydrothermal kettle, further adding the distilled water into the hydrothermal kettle, carrying out hydrothermal treatment at 200 DEG C, taking out a sample and placing in the baking oven for drying; and placing the dried sample in an aluminium oxide crucible, placing in a muffle furnace, increasing the temperature to 1150-1200 DEG C and keeping the temperature for 2h, thereby obtaining the nano-mullite powder. The sol-gel-ultrasonic method is firstly used in the method for preparing the mullite dried gel, then water is selected as a solvent, the hydrothermal treatment is carried out for a period of time, and then the calcination is carried out in the muffle furnace. The obtained nano-mullite powder has the advantages of uniform distraction of the particle size, controllable shape, short reaction cycle and good repeatability, thereby having broad development prospects.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of mullite powder. Background technique [0002] Mullite (mullite) is a very practical structural and functional material, which has excellent characteristics that other inorganic non-metallic materials do not have, such as low thermal conductivity and thermal expansion coefficient, high creep resistance and thermal shock stability, Excellent electrical insulation, chemical stability and high-temperature strength, etc., can be used as high-temperature structural materials, infrared transparent windows, microelectronic substrate materials, and catalyst carrier materials. It is widely used to make engineering materials, refractory materials and protective coating materials. Mullite porcelain with mullite as the main crystal phase is considered to be Ideal material for encapsulation of modern new computer components. Mullite materials (including...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26
Inventor 黄剑锋杨强曹丽云吴建鹏
Owner SHAANXI UNIV OF SCI & TECH