Preparation method of mullite fiber

A technology of mullite fiber and gel fiber, which is applied in the field of heat insulation of refractory materials, can solve the problems of high energy consumption and short fiber length, and achieve the effects of low energy consumption, short preparation time and cheap raw materials

Active Publication Date: 2014-10-08
南京理工宇龙新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic fibers are made by melt blowing method, which requires high energy consumption and short fiber length.

Method used

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  • Preparation method of mullite fiber
  • Preparation method of mullite fiber
  • Preparation method of mullite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 30g of anhydrous aluminum chloride in 500ml of water, and then put it into a reaction kettle with heating and reflux at a certain ratio with 30.3g of aluminum powder (the molar ratio of Al / Cl is 2.0), and heat at 90~100℃ for 2~3h , obtained polyaluminum chloride mother liquor (Al 2 o 3 The mass fraction of 12.5%).

[0026] According to mullite (3Al 2 o 3 2SiO2 2 ), that is, the molar ratio of Al / Si is 3:1, measure 100ml of tetraethyl orthosilicate (TEOS), add the blend of TEOS and absolute ethanol to the mixed solution of nitric acid and acetic acid, stir After 0.5h, TEOS was rapidly hydrolyzed under acidic conditions to obtain silicic acid sol. The volume ratio of TEOS, absolute ethanol, concentrated nitric acid, acetic acid and water is 10:5:1:1:15. At the same time, the silicic acid sol should be used as soon as possible, so as not to form a three-dimensional network structure and lose its effectiveness after standing for a long time. Add the silica s...

Embodiment 2

[0029] Dissolve 30g of anhydrous aluminum chloride in 500ml of water, then add 30.3g of aluminum powder into a reaction kettle with heating and reflux, heat at 100°C for 2~2.5h, cool and filter to obtain the mother liquor of polyaluminum chloride.

[0030] According to Al 2 o 3 :SiO2 2 The mass ratio of MgO is 72:27:1. Measure 96ml of tetraethyl orthosilicate (TEOS), add the blend of TEOS and absolute ethanol to the mixed solution of nitric acid and acetic acid, and stir for 0.5h , TEOS is rapidly hydrolyzed to obtain a silicic acid solution. The volume ratio of TEOS, absolute ethanol, concentrated nitric acid, acetic acid and water is 10:5:1:1:15. Measure the basic magnesium carbonate (chemical formula 4Mg(OH)) of 2.3g 2 · MgCO 3 ) was dissolved in 10 g of glacial acetic acid to form a transparent solution.

[0031] Add the silica sol to the polyaluminum chloride solution, add the magnesium acetate solution to the mixed solution of the two, and then add 25ml of glacial ...

Embodiment 3

[0034] Dissolve 30g of anhydrous aluminum chloride in 500ml of water, then add 30.3g of aluminum powder into a heated and refluxed trident flask, heat at 90-100°C for 2-3 hours, cool and filter to obtain a transparent polyaluminum chloride mother liquor.

[0035] According to Al 2 o 3 :SiO2 2 :B 2 o 3 The mass ratio of the chemical composition is 72:26:2. Measure 92ml of tetraethyl orthosilicate (TEOS), and add the blend of TEOS and absolute ethanol to the mixed solution of nitric acid and acetic acid. TEOS is under acidic conditions. Rapid hydrolysis to obtain silicic acid solution. The volume ratio of TEOS, absolute ethanol, concentrated nitric acid, acetic acid and water is 10:5:1:1:15. Measure the boric acid powder (chemical formula H of 3.3g 3 BO 3 ) was dissolved in 50ml of hot water to form a transparent solution.

[0036] Add the silica sol to the prepared polyaluminum chloride solution, then add the boric acid solution, then add 30ml of glacial acetic acid as ...

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Abstract

The invention discloses a preparation method of high-purity continuous mullite fiber. The mullite fiber is prepared by adopting a sol-gel method and a centrifugal spinning technology through taking anhydrous aluminum chloride and aluminum powder as an aluminum source, tetraethylorthosilicate as a silicon source, and glacial acetic acid as a colloid stabilizer and spinning auxiliary. The preparation method comprises the following steps: firstly, preparing a mullite fiber precursor sol according to raw materials, preparing gel fibers through the centrifugal spinning technology, and finally drying and sintering at high temperature to obtain the mullite fiber. In order to improve the room-temperature and high-temperature mechanical performance of mullite, 0-2wt% of oxide second phase is added. Compared with the prior art, the mullite fiber prepared by adopting the method has the advantages that the consumed time is short, raw materials are low in price, and industrial production can be considered; the mullite fiber is higher in high-temperature resistance degree and better in physical and chemical properties compared with aluminum silicate fiber and high-purity alumina fiber; the mullite fiber can also be used as base fibers of mullite fiber felts and fiberboards, and can be further processed.

Description

technical field [0001] The invention belongs to the technical field of heat insulation of refractory materials, and in particular relates to a preparation method of mullite fiber. Background technique [0002] Mullite (3Al 2 o 3 2SiO2 2 ) is SiO 2 -Al 2 o 3 The system is the only crystalline compound that exists stably under normal pressure, and it is an excellent high-temperature-resistant ceramic material. Mullite fiber has good high-temperature mechanical strength, creep resistance, thermal stability and chemical stability, and also has low density, thermal expansion coefficient, thermal conductivity and electrical conductivity, as well as good dielectric properties. Compared with non-oxide fibers such as C fiber or SiC fiber, mullite fiber has better high temperature oxidation resistance and has a wide range of application values. [0003] Due to the excellent performance of mullite fiber, it is used as furnace lining material and heat insulation material in high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 刘和义乔健黄振进崔宏亮朱玉龙
Owner 南京理工宇龙新材料科技股份有限公司
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