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Sol-gel preparation method of alumina fiber element

A kind of alumina fiber and sol-gel technology, which is applied in the direction of spinning solution preparation, fiber treatment, artificial filament of inorganic raw materials, etc., can solve the problems of backward research level, fiber continuity and mechanical properties, etc., and achieve the goal of preparation The effect of low temperature, short time and low requirements on process conditions

Inactive Publication Date: 2017-04-26
江西金思康药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an important strategic material, the import of alumina fiber has been restricted by foreign countries, while domestic research on alumina is mainly limited to short fibers. In terms of continuous alumina fiber, the domestic research level is relatively backward, and the fiber continuity and mechanical properties obtained The performance cannot meet the application requirements of relevant departments, so exploring new preparation technology of alumina fiber and further improving the performance index of alumina fiber is the focus of research on alumina fiber in my country at present.

Method used

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  • Sol-gel preparation method of alumina fiber element
  • Sol-gel preparation method of alumina fiber element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take a certain amount of crystalline alumina, add deionized water, and mix evenly to obtain an aluminum chloride solution. Press the aluminum powder

[0024] Add n(AlCl3·6H2O) / n(Al)=1:2 ratio into the aluminum chloride solution, heat and reflux in a constant temperature water bath at 80°C for 12 hours while stirring mechanically to obtain a colloidal mother liquor, and then transfer it to the Suction filtration in the filter unit. Add 5% lactic acid fiber-forming additive to the colloidal mother liquor, stir evenly and concentrate at a constant temperature of 60°C for 12 hours to obtain boehmite spinnable sol in the form of light yellow transparent colloid with a viscosity of 100 Pa·s. The boehmite spinnable sol was formed into fibers at room temperature and dried for 18 hours to obtain gel fibers. The gel fiber is heat treated at a heat treatment temperature of 1400°C, the heating rate between room temperature and 277°C is 1°C / min, and the heat preservation is 1h; th...

Embodiment 2

[0027] Take a certain amount of crystalline alumina, add deionized water, and mix evenly to obtain an aluminum chloride solution. Press the aluminum powder

[0028] Add n(AlCl3·6H2O) / n(Al)=1:3 ratio into the aluminum chloride solution, heat and reflux in a constant temperature water bath at 90°C for 10 h while stirring mechanically to obtain a colloidal mother liquor, which is then transferred to the Suction filtration in the filter unit. Add 30% acetic acid fiber-forming additives to the colloidal mother liquor, stir evenly and concentrate at a constant temperature of 70°C for 10 hours to obtain a light yellow transparent colloidal boehmite spinnable sol with a viscosity of 200Pa·s. Air-dried at room temperature for 24 hours to obtain gel fibers. The gel fiber is heat-treated at a heat treatment temperature of 1200°C, and the temperature rise rate between room temperature and 277°C is controlled to be 2°C / min, and the heat preservation is 3h; the temperature rise rate betwe...

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Abstract

The invention discloses a sol-gel preparation method of an alumina fiber element, and belongs to the field of inorganic fibers. The preparation method comprises the following steps: preparing spinnable sol from main raw materials comprising crystallized alumina, deionized water and aluminum powder by adopting a filamentation assistant as an auxiliary material, and carrying out fiber formation, drying and heat treatment on the spinnable sol to obtain the alumina fiber. The preparation method has the advantages of easily available raw materials, simple process, convenience in operation, low energy consumption, and obtaining of continuous fibers. The gel fiber obtained in the invention is colorless, transparent and glossy, and has smooth and obvious defect-free surface; and alumina fibers obtained after heat treatment at a certain temperature have complete crystal form and good development, have compact and uniform fiber surface, and have good mechanical performances.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of alumina fibers. Background technique [0002] Alumina fiber is a new type of high-performance inorganic oxide fiber developed in recent years. It is a polycrystalline inorganic fiber whose main component is alumina. Alumina fiber has chemical stability, structural stability and excellent high-temperature mechanical properties, and is widely used in fields with high material requirements. The raw materials are easy to obtain, the production path is simple, and the requirements for production equipment are not high. The inorganicization process does not need to be protected by inert gas, and can be carried out directly in the air. Compared with commodity inorganic fibers such as carbon fiber Nicalon, the production cost of alumina fiber is much lower. In today's rapid economic development, alumina has sup...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D1/02D01D5/00C04B35/10C04B35/624
CPCD01F9/08C04B35/10C04B35/62236C04B35/624C04B2235/606C04B2235/6562C04B2235/6567C04B2235/95C04B2235/96D01D1/02D01D5/00
Inventor 曾曜龙
Owner 江西金思康药业有限公司
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