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Method for preparing mullite porous ceramic by alumina fiber reinforced opoka

An alumina fiber and porous ceramic technology, applied in the field of inorganic ceramic materials, can solve the problems of low strength and high porosity, and achieve the effects of high porosity, good adsorption and low production cost

Inactive Publication Date: 2018-12-25
WUHU YUANKUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preparing mullite porous ceramics from alumina fiber-reinforced protein soil, which solves the contradiction between the porosity and strength of the existing mullite porous ceramics, the problems of high porosity and low strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing mullite porous ceramics from alumina fiber reinforced protein clay, comprising the following steps:

[0023] (1) According to the weight ratio of modified protein soil, aluminum hydroxide, ρ-alumina, alumina fiber and sintering aid is 3:4:0.9:0.1:0.1, put the raw materials into the agate ball mill jar, and use a planetary ball mill Ball mill at 300rpm for 3h to obtain a uniformly mixed powder;

[0024] (2) mixing the uniform powder with water to prepare a ceramic slurry with a solid content of 55%;

[0025] (3) Pour the prepared ceramic slurry into a mold of a certain shape quickly and cast it into a mold, and vacuum degassing to remove the air bubbles in the slurry, and then place the sample at room temperature to dry for 48 hours to obtain a ceramic green body;

[0026] (4) Sinter the ceramic green body, cool it, slowly raise the temperature to 300°C at a rate of 1°C / min, then raise the temperature to 800°C at 2°C / min, raise the temperature to ...

Embodiment 2

[0030] A method for preparing mullite porous ceramics from alumina fiber reinforced protein clay, comprising the following steps:

[0031] (1) According to the weight ratio of modified protein soil, aluminum hydroxide, ρ-alumina, alumina fiber and sintering aid is 3:4:0.9:0.1:0.1, put the raw materials into the agate ball mill jar, and use a planetary ball mill Ball mill at 300rpm for 3h to obtain a uniformly mixed powder;

[0032] (2) mixing the uniform powder with water to prepare a ceramic slurry with a solid content of 55%;

[0033] (3) Pour the prepared ceramic slurry into a mold of a certain shape quickly and cast it into a mold, and vacuum degassing to remove the air bubbles in the slurry, and then place the sample at room temperature to dry for 48 hours to obtain a ceramic green body;

[0034] (4) Sinter the ceramic green body, cool it, slowly raise the temperature to 300°C at a rate of 1°C / min, then raise the temperature to 800°C at 2°C / min, raise the temperature to ...

Embodiment 3

[0038] A method for preparing mullite porous ceramics from alumina fiber reinforced protein clay, comprising the following steps:

[0039] (1) According to the weight ratio of modified protein soil, aluminum hydroxide, ρ-alumina, alumina fiber and sintering aid is 3:4:0.9:0.1:0.1, put the raw materials into the agate ball mill jar, and use a planetary ball mill Ball mill at 300rpm for 3h to obtain a uniformly mixed powder;

[0040] (2) mixing the uniform powder with water to prepare a ceramic slurry with a solid content of 55%;

[0041] (3) Pour the prepared ceramic slurry into a mold of a certain shape quickly and cast it into a mold, and vacuum degassing to remove the air bubbles in the slurry, and then place the sample at room temperature to dry for 48 hours to obtain a ceramic green body;

[0042] (4) Sinter the ceramic green body, cool it, slowly raise the temperature to 300°C at a rate of 1°C / min, then raise the temperature to 800°C at 2°C / min, raise the temperature to ...

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Abstract

The invention relates to a method for preparing a mullite porous ceramic by alumina fiber reinforced opoka. The method includes the steps: (1) placing raw materials including modified opoka, aluminumhydroxide, rho-alumina, alumina fibers and sintering aids according to the weight ratio of 3:4:0.9:0.1:0.1 into an agate jar, and performing ball-milling for 3 hours at the speed of 300rpm by a planetary ball mill to obtain uniformly mixed powder; (2) adding water into the powder and preparing ceramic slurry with the solid content of 55%; (3) rapidly pouring the prepared ceramic slurry into a diein a certain shape, casting and forming the ceramic slurry, performing vacuum degassing, removing bubbles in the slurry and then drying a sample at room temperature for 48 hours to obtain a ceramic green body; (4) sintering and cooling the ceramic green body to obtain the mullite porous ceramic. The mullite porous ceramic has the advantages that preparation technology is simple and easy to control, pollution is low in the preparation process, production cost is low, and the prepared mullite porous ceramic is high in strength and open porosity.

Description

technical field [0001] The invention relates to a method for preparing mullite porous ceramics from alumina fiber reinforced protein soil, which belongs to the field of inorganic ceramic materials. Background technique [0002] Due to its good chemical stability, high strength at room temperature and high temperature, excellent thermal shock resistance and good fluid permeability, mullite porous ceramics are widely used in hot gas filtration, molten metal filtration, catalyst carrier and thermal insulation. Show broad application prospects. Different aluminum raw materials have an important influence on the microstructure, phase composition and properties of the formed acicular mullite. Jiang Dongliang et al. (Chinese Patent, Patent Publication No. CN101037345) used white carbon black and alumina as main raw materials to prepare mullite porous ceramics by gel freeze-drying. Yuan Lei et al. (Chinese Patent, Patent Publication No. CN103833400) use minerals or solid wastes co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/80C04B35/622C04B35/626C04B35/64C04B38/08
CPCC04B35/185C04B35/622C04B35/62605C04B35/62675C04B35/64C04B35/803C04B38/08C04B2235/3217C04B2235/3218C04B2235/3229C04B2235/3418C04B2235/3463C04B2235/349C04B2235/5224C04B2235/6562C04B2235/6567C04B2235/96C04B38/0058C04B38/0074
Inventor 郭元章波
Owner WUHU YUANKUI NEW MATERIAL TECH CO LTD
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