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Preparation method of alumina-based continuous fibers

A continuous fiber, alumina-based technology, applied in the field of preparation of alumina-based continuous fibers, can solve the problems of relatively expensive price, which is not conducive to the large-scale production of alumina fibers, and achieves low-cost, simple equipment and low sintering temperature. Effect

Inactive Publication Date: 2014-04-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel method uses metal alkoxide as raw material, which is more expensive, which is not conducive to the large-scale production of alumina fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the following steps: (1) preparation of polyvinyl alcohol solution, (2) preparation and spinning of spinning solution, (3) drying and calcination of as-spun fibers to prepare alumina-based continuous fibers, wherein:

[0024] The polyvinyl alcohol powder was washed with distilled water at 20°C for 6 times, and then dehydrated with a washing machine so that the water content (mass ratio) of the polyvinyl alcohol after dehydration was 50%. Dissolve polyvinyl alcohol in distilled water at 90° C., and mechanically stir for 10 hours until the polyvinyl alcohol is completely dissolved to obtain a polymer solution with a mass fraction of polyvinyl alcohol of 10%.

[0025] The silica sol was added dropwise into the polyvinyl alcohol solution, and mechanically stirred until a uniform solution was formed, so that the mass ratio of the silica sol to the polymer solution was 0.5:1. Add aluminum nitrate to the above-mentioned homogeneous solution, and continue mechanica...

Embodiment 2

[0028] According to the steps in Example 1, the polyvinyl alcohol solution was prepared, the spinning solution was prepared, and the as-spun fibers were spun, dried and calcined to obtain alumina-based continuous fibers. The difference is that the water content (mass ratio) of the polyvinyl alcohol is 70% after dehydration by the washing machine. The temperature of the distilled water in which the polyvinyl alcohol is dissolved is 98° C., and the mass fraction of the polyvinyl alcohol after dissolution is 20%. Ethyl orthosilicate was added dropwise into the polyvinyl alcohol solution, and the mass ratio of ethyl orthosilicate to the polyvinyl alcohol solution was 0.2:1. Aluminum chloride is added to the above solution, and the molar ratio of Al and Si in the obtained spinning solution is 1:1, and it is allowed to stand for degassing at 98°C for 2 hours. It is extruded from the board, enters the coagulation bath at 30°C through a 10cm dry spinning process, and forms primary fi...

Embodiment 3

[0030]According to the steps in Example 1, the polyvinyl alcohol solution was prepared, the spinning solution was prepared, and the as-spun fibers were spun, dried and calcined to obtain alumina-based continuous fibers. The difference is that the water content (mass ratio) of the polyvinyl alcohol is 60% after being dehydrated with a washing machine. Polyvinyl alcohol was dissolved in distilled water at 95°C to obtain a polymer solution with a mass fraction of polyvinyl alcohol of 15%. Ethyl orthosilicate was added dropwise into the polyvinyl alcohol solution, and the mass ratio of ethyl orthosilicate to the polyvinyl alcohol solution was 0.1:1. Aluminum chloride was added to the above solution, and the molar ratio of Al and Si in the resulting spinning solution was 1:0.8. Transfer the spinning solution into the spinning kettle, let stand at 95°C for 8 hours to degas, and use the wet spinning process to extrude the spinning solution from the spinneret into the coagulation bat...

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PUM

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Abstract

The invention relates to a preparation method of alumina-based continuous fibers. The preparation method comprises the steps of washing polyvinyl alcohol powder, and dissolving in distilled water at 90-98 DEG C after dehydrating to obtain polymer solution, wherein the content of polyvinyl alcohol in the polymer solution is 10-25%; adding a silicon source A into the polymer solution, stirring to form even solution, and adding aluminum salt B to enable the atomic ratio of aluminum to silicon in the polymer solution to be 1:(0-1), so as to obtain spinning solution; transferring the spinning solution into a spinning kettle, degassing in a standing state, extruding the spinning solution from a spinneret plate by adopting a dry-wet spinning method, and carrying out dry spinning and then solidification in a coagulating bath to form nascent fibers; drying the nascent fibers, and calcining in a high-temperature furnace while controlling the temperature rise rate and the temperature rise program to finally obtain the alumina-based continuous fibers. The raw materials have low price, no expensive equipment is required, the sintering temperature is low, and the prepared alumina-based continuous fibers have good flexibility and can meet special requirements such as composite fiber preforms and other structural materials.

Description

technical field [0001] The invention relates to a method for preparing alumina-based continuous fibers, in particular to a method for preparing alumina-based continuous fibers that can be wound and have good flexibility. Background technique [0002] Alumina-based continuous fiber is a kind of ceramic fiber with alumina as the main component. It has good heat resistance, no erosion by molten metal, good surface activity, good chemical corrosion resistance and oxidation resistance. In view of the above characteristics, alumina fiber is suitable for the manufacture of lightweight, high-strength and heat-resistant structural parts, such as radome made of alumina fiber, which has higher rigidity than FRP, good radio wave performance, and high temperature resistance. Alumina fiber is used as The missile casing made of reinforcement can improve the toughness of the matrix and increase the heat resistance of the composite material. [0003] Alumina-based continuous fibers can be d...

Claims

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Application Information

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IPC IPC(8): D01F9/08C04B35/10
Inventor 张亚彬苏梦玲曹旭李子度刘俊成肖长发
Owner TIANJIN POLYTECHNIC UNIV