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Method for preparing corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode

A technology of mullite whiskers and refractory materials, which is applied in the field of high-temperature refractory materials, can solve the problems of limited material performance improvement, difficulty in achieving the toughness of whiskers, and uncontrollable microstructural state of the generated quantity, and achieve broad market prospects , Improve the strength and thermal shock resistance

Inactive Publication Date: 2014-06-11
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most whiskers are strengthened by adding whiskers. This method is difficult to disperse uniformly in the matrix, and it is difficult to achieve the toughening effect of whiskers, so there are great limitations; The method of toughening corundum-mullite with cometite whiskers, this method is to make all the raw materials one-time batching, wet ball milling, molding and sintering, and prepare refractory materials in situ, but the method of mullite whiskers The microstructural state that affects the properties of the material, such as the number of generated, the whisker aspect ratio, etc., cannot be controlled, so the improvement of the material properties is limited.

Method used

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  • Method for preparing corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode
  • Method for preparing corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode
  • Method for preparing corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode

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Effect test

Embodiment 1

[0024] The first step: preparation of mullite whisker precursor particles, after weighing 55% aluminum hydroxide, 45% Suzhou soil, 3% aluminum fluoride, 4% vanadium pentoxide, after ball milling, sieving and spraying Water granulation, the particle size is controlled at 20-60 mesh, stale for later use;

[0025] The second step: preparation of corundum sintered body precursor powder, according to 75% industrial а-Al 2 o 3 , 15% Suzhou kaolin, 2% calcite, 4% BaCO 3 , 4% talc, after weighing, wet ball milling, drying, milling, and sieving for subsequent use;

[0026] Step 3: After weighing the granulated mullite whisker precursor particles and corundum sintered body precursor powder according to the weight ratio = 60:40, after dry mixing, the mullite whisker precursor particles The distribution in the corundum sintered body precursor powder is as follows figure 1 As shown, then carry out semi-dry pressing molding under 8Mpa pressure, and finally raise the temperature of the p...

Embodiment 2

[0028] The first step: preparation of mullite whisker precursor particles, after weighing 55% aluminum hydroxide, 45% Suzhou soil, 3% aluminum fluoride, 4% vanadium pentoxide, after ball milling, sieving and spraying Water granulation, the particle size is controlled at 20-60 mesh, stale for later use;

[0029] The second step: preparation of corundum sintered body precursor powder, according to 75% industrial а-Al 2 o 3 , 15% Suzhou kaolin, 2% calcite, 4% BaCO 3 , 4% talc, after weighing, wet ball milling, drying, milling, and sieving for subsequent use;

[0030] Step 3: After weighing the granulated mullite whisker precursor particles and corundum sintered body precursor powder according to the weight ratio = 50:50, after dry mixing, the mullite whisker precursor particles The distribution in the corundum sintered body precursor powder is as follows figure 1 As shown, then carry out semi-dry pressing molding under 8Mpa pressure, and finally raise the temperature of the p...

Embodiment 3

[0032] The first step: preparation of mullite whisker precursor particles, after weighing 55% aluminum hydroxide, 45% Suzhou soil, 3% aluminum fluoride, 4% vanadium pentoxide, after ball milling, sieving and spraying Water granulation, the particle size is controlled at 20-60 mesh, stale for later use;

[0033] The second step: preparation of corundum sintered body precursor powder, according to 75% industrial а-Al 2 o 3 , 15% Suzhou kaolin, 2% calcite, 4% BaCO 3 , 4% talc, after weighing, wet ball milling, drying, milling, and sieving for subsequent use;

[0034] Step 3: After weighing the granulated mullite whisker precursor particles and corundum sintered body precursor powder according to the weight ratio = 40:60, after dry mixing, the mullite whisker precursor is in The distribution of corundum sintered body precursor powder is as follows figure 1As shown, then carry out semi-dry pressing molding under 8Mpa pressure, and finally raise the temperature of the pressed sa...

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Abstract

The invention discloses a method for preparing a corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode. The method includes: weighing mullite whisker precursor particles and corundum sintering body precursor powder with the weight percentage of (40-60): (40-60), performing mixing in dry method, performing dry pressing, and sintering to obtain the corundum-mullite (whisker) fireproofing material. By creatively adding the mullite whisker precursor particles with certain pelleting grain size into the sintering body precursor powder, acicular mullite can be synthesized in positioned, quantitative in-situ mode to prepare the corundum-mullite (whisker) fireproofing material; and by means of the high strength and low expansibility characteristics of the mullite whisker network structure even in distribution and generated in in-situ mode, strength and thermal shock resistance of the material are remarkably improved, and the method has wide market space.

Description

technical field [0001] The invention belongs to the field of high-temperature refractory materials, specifically, a new quantitative in-situ synthesis process of a mullite whisker precursor is used to prepare corundum-mullite (晶须) method of refractory materials. Background technique [0002] Refractory material is a kind of structural material, which is generally used for thermal equipment such as high-temperature kiln and industrial high-temperature containers and components, and it also needs to withstand corresponding physical and chemical changes and mechanical effects. With the improvement of science and technology and industrial level, and in order to meet the needs of ceramics, metals and other high-temperature technology industries and thermal engineering, the demand for high-quality refractory materials has been increasing, precisely because of the huge demand for this industry. The demand has promoted the rapid development of refractory materials. In the process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185C04B35/101C04B35/622
Inventor 顾幸勇李萍罗婷胡克艳董伟霞
Owner JINGDEZHEN CERAMIC UNIV