Preparation method of continuous ceramic fiber

A technology of ceramic fiber and gel fiber, which is applied in the direction of inorganic raw material artificial filament, etc., can solve the problems of affecting the uniformity of fiber microstructure, difficulty in dispersing ceramic powder, and unfavorable mechanical properties, so as to achieve low raw material cost and high stability The effect of good compatibility and strong process adaptability

Inactive Publication Date: 2020-03-06
青岛中科星熠高新技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of this method is that the dispersion of the ceramic powder is difficult and usually forms agglomerates, which seriously affects the uniformity of the fiber microstructure and adversely affects the mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 200ml of aluminum trichloride aqueous solution (1mol / L) and 27g of metal aluminum powder into a 500ml round bottom flask, and heat to reflux for 12h to completely dissolve the aluminum powder. After cooling, filter with filter paper to obtain a clear alumina sol.

[0022] (2) Dissolve 11.18g of ethyl orthosilicate (Si(OC2H5)4) in 40ml of absolute ethanol, add 10ml of ammonia solution (1%), hydrolyze at 60°C for 24h, add dilute hydrochloric acid to adjust the pH value to 4, A silica sol with an average particle diameter of 30 nm was obtained.

[0023] (3) 5 g of polyvinyl alcohol with an average degree of polymerization of 1750 and a degree of alcoholysis of 99% was dissolved in 95 g of water to prepare a 5% solution to obtain a spinning aid.

[0024] (4) After stirring and mixing the alumina sol obtained in step (1) with the silica sol obtained in step (2), then add 50 g of spinning aid obtained in step (3), and after stirring and mixing, Concentrate under red...

Embodiment 2

[0029] (1) Add 200ml of titanium trichloride aqueous solution (1mol / L) and 27g of metal titanium powder into a 500ml round bottom flask, and heat to reflux for 12h to completely dissolve the aluminum powder. After cooling, filter with filter paper to obtain a clear titanium dioxide sol.

[0030] (2) Dissolve 11.18g of ethyl orthosilicate (Si(OC2H5)4) in 40ml of absolute ethanol, add 10ml of ammonia solution (1%), hydrolyze at 60°C for 24h, add dilute hydrochloric acid to adjust the pH value to 4, A silica sol with an average particle diameter of 30 nm was obtained.

[0031] (3) 5 g of polyvinyl alcohol having an average degree of polymerization of 1750 and a degree of alcoholysis of 99% was dissolved in 95 g of water to form a 5% solution to obtain a spinning aid.

[0032] (4) After the titania sol obtained in step (1) is stirred and mixed with the silica sol obtained in step (2), then 57 g of spinning aids obtained in step (3) are added, and after stirring and mixing, it is ...

Embodiment 3

[0037] (1) Add 200ml of zirconium trichloride aqueous solution (1mol / L) and 27g of metal titanium powder into a 500ml round bottom flask, and heat to reflux for 12h to completely dissolve the aluminum powder. After cooling, filter with filter paper to obtain a clear zirconia sol.

[0038] (2) Dissolve 11.18g of ethyl orthosilicate (Si(OC2H5)4) in 40ml of absolute ethanol, add 10ml of ammonia solution (1%), hydrolyze at 60°C for 24h, add dilute hydrochloric acid to adjust the pH value to 4, A silica sol with an average particle diameter of 30 nm was obtained.

[0039](3) 5 g of polyvinyl alcohol having an average degree of polymerization of 1750 and a degree of alcoholysis of 99% was dissolved in 95 g of water to form a 5% solution to obtain a spinning aid.

[0040] (4) After the titania sol obtained in step (1) is stirred and mixed with the silica sol obtained in step (2), then 55 g of spinning aid obtained in step (3) is added, and the mixture is stirred and mixed at 90 Con...

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PUM

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Abstract

The invention relates to the field of inorganic nonmetallic materials, in particular to a preparation method of a continuous ceramic fiber. The preparation method includes the steps: 1) preparing component A sol; 2) preparing silicon dioxide sol; 3) mixing the component A sol and the silicon dioxide sol to obtain two-phase sol, and adding spinning additives; 4) concentrating the two-phase sol added the additives, and spinning the sol by a dry method to obtain a gel fiber; 5) pyrolyzing the gel fiber to obtain a ceramic fiber; 6) sintering the ceramic fiber to obtain a continuous aluminum oxideceramic fiber. The preparation method of the continuous ceramic fiber has the advantages of low raw material cost, stable process and easiness adjustment. According to the method, main raw materialsare wide in source and cheap, and the method has an obvious advantage of cost as compared with a metal alkoxide hydrolysis method and a siloxane method. Stability and compatibility of metal sol and silicon dioxide sol are good, ceramic fibers with different contents of silicon dioxide can be prepared as required, and a technological adaptability is high.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a method for preparing continuous ceramic fibers. Background technique [0002] There are many ways to add silica to ceramic fibers: (1) in the form of organosilicon compounds, such as silicates, organosiloxanes, etc. The silica sol is formed by acid catalysis, then added to the sol, mixed and concentrated to a suitable viscosity for spinning. The biggest difficulty of this method is that the hydrolysis of organosilicon is not complete, and the stability of the resulting sol spinning solution is poor. In the process of fiber production, the properties of the sol change significantly, which affects the stability of the process and product quality. (2) In the form of organic precursors, such as polyaluminum siloxane. The organopolyaluminum siloxane is directly obtained through chemical synthesis, and then dissolved in an organic solvent to obtain a solution suitabl...

Claims

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Application Information

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IPC IPC(8): D01F9/08C04B35/10C04B35/46C04B35/48C04B35/624C04B35/622
CPCC04B35/62236C04B35/6225C04B35/62259C04B35/624C04B2235/3418C04B2235/6562C04B2235/6567D01F9/08
Inventor 梁栋
Owner 青岛中科星熠高新技术研究院有限公司
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