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A low-density high-performance alumina-based ceramic fiber and its preparation method

An alumina, high-performance technology, applied in the direction of inorganic raw material rayon, etc., can solve the problems of short fiber, reduced strength, poor fiber compactness, etc., and achieve the effect of simple process, stable performance and easy operation.

Active Publication Date: 2019-04-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alumina fibers prepared by Venkatesh et al. using sol-gel method combined with spinning technology, in which SiO 2 The content is about 4%, the strength and flexibility are better, but the fibers are shorter (see: Ceram.Int.1999,25,539)
[0005] It can be seen from numerous research reports that there are some deficiencies in the current preparation methods of alumina-based fibers: First, polymer spinning aids are mostly added in the preparation process of aluminum sol, and the polymer aids become bubbles after calcination. , the fiber compactness becomes worse, and the strength decreases; the second is that the alumina-based ceramic fibers currently industrialized in China are short fibers, and the production process is mainly based on high-temperature melting and spinning technology. For sol-gel technology combined with dry spinning technology Research is still in the exploratory stage

Method used

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  • A low-density high-performance alumina-based ceramic fiber and its preparation method
  • A low-density high-performance alumina-based ceramic fiber and its preparation method
  • A low-density high-performance alumina-based ceramic fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of sol: add 28.14g Al(NO 3 )·9H 2 O, dissolved to a clear solution, added 42.20 g CH 3 COOAl(OH) 2 1 / 3H 3 BO 3 , the mixed solution was stirred at room temperature until it became transparent, 25.04 g of silica sol was added, and the mixed solution was aged in a water bath at 45°C.

[0043] (2) Dry spinning: the sol obtained in step (1) is spun by a dry spinning machine to obtain alumina cellulose filaments. Dry spinning process conditions: spinneret pressure 520KPa, spinneret hole diameter 0.07mm, tunnel air temperature 30°C, collection roller line speed 18m / min.

[0044] (3) Cellulose filament firing: heat up from room temperature to 600°C at a speed of 2°C / min, and keep at this temperature for 1 hour, then raise the temperature from 600°C to 1000°C at a speed of 10°C / min, and keep at this temperature 30min to obtain alumina-based continuous ceramic fibers.

[0045] The sol prepared by the above-mentioned method does not need to add spinning aid...

Embodiment 2

[0047] (1) Preparation of sol: add 11.35g AlCl to 90.00g deionized water 3 ·6H 2 O, dissolved to a clear solution, added 42.20 g CH 3 COOAl(OH) 2 1 / 3H 3 BO 3 , the mixed solution was stirred at room temperature until it became transparent, 25.04 g of silica sol was added, and the mixed solution was aged in a water bath at 45°C.

[0048] Step (2) is the same as in Example 1.

[0049] (3) Cellulose filament firing: heat up from room temperature to 600°C at a speed of 15°C / min, and keep at this temperature for 1 hour, then raise the temperature from 600°C to 1000°C at a speed of 10°C / min, and keep at this temperature 2h, alumina-based continuous ceramic fibers were obtained.

[0050] The resulting alumina-based continuous ceramic fiber has a diameter of 6-15 μm and a density of 2.6 g / cm 3 , the tensile strength is 1.4GPa, the modulus of elasticity is 145GPa, where Al 2 o 3 content of 62%, SiO 2 Content is 24%, B 2 o 3 The content is 14%, and the average particle diame...

Embodiment 3

[0052] As described in Example 1, the difference is: Al(NO 3 )·9H 2 The amount of O added is 15.00g, and 42.20g CH is added 3 COOAl(OH) 2 1 / 3H 3 BO 3 , Silica sol add-on is 22.70g, other is with embodiment 1.

[0053] The obtained alumina-based continuous ceramic fiber has a diameter of 6-15 μm and a density of 2.67 g / cm 3 , the tensile strength is 1.65GPa, the modulus of elasticity is 150GPa, where Al 2 o 3 content of 62%, SiO 2 Content is 24%, B 2 o 3 The content is 14%, and the average particle size of the particles constituting the fiber is about 35nm. The fiber diameter was measured by SEM, and the tensile strength and elastic modulus were measured by single fiber strength tester.

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Abstract

The invention relates to a preparation method for a low-density high-performance alumina-based ceramic fiber. The method comprises the following steps: preparing spinnable alumina-based fiber precursor sol from an inorganic aluminum salt, a boron-containing additive, a silicone-containing additive and the like by using a sol-gel process; carrying out dry-process spinning so as to obtain alumina-based continuous green fibrous filaments; and subjecting the filaments to drying and sintering so as to obtain the alumina-based continuous ceramic fiber. The sol fiber prepared in the invention has good stability; preparation process is simple; the filaments can be formed without a high-molecular auxiliary agent; and the sintered fiber has low density and high strength and can be applied to high-tech fields like aviation and aerospace.

Description

technical field [0001] The invention relates to a preparation method of a low-density high-performance alumina-based ceramic fiber, which belongs to the technical field of inorganic fibers. Background technique [0002] Alumina-based ceramic fiber is a high-performance inorganic fiber that has attracted much attention in recent years. Its outstanding advantages are excellent physical and chemical properties, such as low creep performance, low density, low thermal conductivity, and good tensile strength. Strength, corrosion resistance and oxidation resistance, high temperature resistance, etc. Compared with non-oxide fibers such as silicon carbide and carbon fiber, it has better oxidation resistance and can maintain good mechanical strength at higher operating temperatures. It is widely used in Aerospace and other high-tech fields. [0003] Alumina-based ceramic fibers are based on Al 2 o 3 Single crystal or polycrystalline fiber as the main component, sometimes contains a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C04B35/117
CPCC04B35/117C04B35/62236C04B2235/3409C04B2235/3418C04B2235/77C04B2235/781C04B2235/96
Inventor 马运柱刘文胜李春兰王娟李银
Owner CENT SOUTH UNIV
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