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Method for preparing mullite whisker-reinforced alumina hollow sphere porous ceramic

A technology of alumina hollow balls and mullite whiskers, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of reducing the weight of the kiln, energy saving and consumption reduction, and high bulk density, achieving low cost and improving use. Long life, excellent high temperature resistance

Inactive Publication Date: 2019-11-26
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brick is characterized by relatively high volume density, low porosity, and relatively high thermal conductivity, which is not conducive to reducing the weight of the kiln, energy saving and consumption reduction.
And because the traditional sintered neck is combined with alumina hollow balls, the strength of the sample is low

Method used

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  • Method for preparing mullite whisker-reinforced alumina hollow sphere porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The mullite whisker-reinforced aluminum oxide hollow sphere porous ceramics given in this example is composed of materials: 70 kg of aluminum oxide hollow spheres with a particle size of 3-0.1 mm, 19 kg of alumina fine powder with a particle size of less than 0.074 mm, 9.2 kg of fine silica powder with a particle size of less than 0.045 mm, and 1.8 kg of fine aluminum fluoride powder with a particle size of less than 0.074 mm. Using starch as a binder and pore-forming agent, through kneading, molding, drying and sintering, the alumina hollow sphere porous ceramics reinforced with mullite whiskers are obtained. The specific operation steps are as follows:

[0017] Step 1: Put the aluminum oxide hollow spheres above in a mixer, add 5kg of water and 6kg of starch, and mix for 15 minutes at a speed of 160r / min; Fine powder, continue to knead with 160r / min rotating speed for 15 minutes, obtain the castable after kneading;

[0018] Step 2, molding, putting the mixed castable...

Embodiment 2

[0023] The mullite whisker-reinforced aluminum oxide hollow sphere porous ceramics given in this example consists of the following: 68 kg of alumina hollow spheres with a particle size of 3-0.1 mm, 21 kg of alumina fine powder with a particle size of less than 0.074 mm, 9kg of fine silica powder with a particle size of less than 0.045mm, and 2kg of fine aluminum fluoride powder with a particle size of less than 0.074mm. Using starch as a binder and pore-forming agent, through kneading, molding, drying and sintering, the alumina hollow sphere porous ceramics reinforced with mullite whiskers are obtained. The specific operation steps are as follows:

[0024] Step 1: Put the aluminum oxide hollow spheres above in a mixer, add 6kg of water and 10kg of starch, and knead for 15 minutes at a speed of 160r / min; Fine powder, continue to knead with 160r / min rotating speed for 15 minutes, obtain the castable after kneading;

[0025] Step 2, forming, putting the mixed castable into a mol...

Embodiment 3

[0030] The mullite whisker-reinforced alumina hollow sphere porous ceramics given in this example is composed of the following: 65kg of alumina hollow spheres with a particle diameter of 3-0.1mm, 22kg of alumina fine powder with a particle diameter of less than 0.074mm, 10.6 kg of fine silica powder with a particle size of less than 0.045 mm, and 2.4 kg of fine aluminum fluoride powder with a particle size of less than 0.074 mm. Using starch as a binder and pore-forming agent, through kneading, molding, drying and sintering, the alumina hollow sphere porous ceramics reinforced with mullite whiskers are obtained. The specific operation steps are as follows:

[0031] Step 1, put the above alumina hollow spheres in a mixer, add 7kg of water and 8kg of starch, and knead for 15 minutes at a speed of 160r / min; then add the above alumina fine powder, silica micropowder, aluminum fluoride Fine powder, continue to knead with 160r / min rotating speed for 15 minutes, obtain the castable a...

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Abstract

The invention relates to a method for preparing mullite whisker-reinforced alumina hollow sphere porous ceramic. The method includes the following steps: putting alumina hollow spheres, alumina fine powder, silica fine powder, aluminum fluoride, starch and water in a mixer for mixing so as to obtain mixed pug, putting the uniformly-mixed pug into a mold, performing molding and pouring, curing a sample in the mold, releasing the mold so as to form an alumina hollow sphere porous ceramic green body, drying the porous ceramic green body obtained after mold release, calcining the dried porous ceramic green body at a high temperature for 2-6 hours, performing natural cooling in the furnace, and taking out the cooled porous ceramic green body so as to obtain the mullite whisker-reinforced alumina hollow sphere porous ceramic. The mullite whisker-reinforced alumina hollow sphere porous ceramic is prepared from Al2O3 and Si02 raw materials with abundant resources, the cost is low, and the toughness and impact strength of the material can be improved through introduction of mullite whisker into the porous ceramic material, so that improvement of the service life of the material is facilitated.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a method for preparing mullite whisker-reinforced aluminum oxide hollow sphere porous ceramics. Background technique [0002] With the development of modern science and technology, especially in the fields of metallurgy, chemical industry, automobile industry, environmental protection and energy, the requirements for materials are becoming more and more stringent, and it is urgent to develop a new type of high-performance structural material. Energy is increasingly scarce, environmental protection is becoming more and more stringent, and insulation materials are an indispensable part of high-temperature industries. Some key properties such as low thermal conductivity, high refractoriness, good volume stability at high temperature, and good thermal shock resistance have been proposed. New requirements to meet the needs of high temperature kilns with lightweight...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/81C04B35/622C04B38/06C04B38/08
CPCC04B35/10C04B35/622C04B38/08C04B2235/3418C04B2235/445C04B2235/5276C04B2235/528C04B2235/5296C04B2235/6562C04B2235/6567C04B2235/96C04B38/0645C04B38/0074
Inventor 罗旭东满奕然杨孟孟
Owner UNIV OF SCI & TECH LIAONING
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