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Method for preparing alumina-based continuous fiber

A continuous fiber and alumina-based technology, which is applied in the field of alumina-based continuous fiber preparation, can solve the problems of complex process and many process parameters, and achieve the effects of stable physical and chemical properties, dense fiber cross-section and good toughness

Inactive Publication Date: 2011-04-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation stage and firing stage of the sol, there are many process parameters and complex processes

Method used

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  • Method for preparing alumina-based continuous fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Melt polypropylene at 150°C according to formula No. 1 in Table 1, and the melted viscosity is 20 poises, then add alumina powder weighed according to formula 1 into the melt, continue to heat and stir continuously to mix evenly, and the viscosity up to 30 poise.

[0031] The above melt is put into a liquid storage tank with a nozzle, and a dry filament is used to obtain a continuous alumina fiber precursor containing alumina.

[0032] The fiber precursors were first baked at 40°C for 10 minutes, then degreased at a low temperature (room temperature to 700°C) at a heating rate of 2°C / min, and then heated to 1800°C at a heating rate of 3°C / min for firing. Keep the temperature at 1800°C for 3 hours to obtain continuous alumina fibers.

Embodiment 2

[0034] Melt polypropylene at 160°C according to formula No. 2 in Table 1, and the melted viscosity is 18 poises, then add alumina powder and silica powder weighed according to formula 2 into the melt, continue heating and stirring To mix evenly, the viscosity reaches 28 poise.

[0035] The above-mentioned melt is added into a liquid storage tank with a nozzle, and a dry filament is used to obtain an alumina continuous fiber precursor containing alumina.

[0036] The fiber precursors were first baked at 40°C for 10 minutes, then degreased at a low temperature (from room temperature to 600°C) at a heating rate of 4°C / min, then heated to 1750°C at a heating rate of 5°C / min and fired. Keep the temperature at 1750°C for 1 hour to obtain continuous alumina-based fibers.

Embodiment 3

[0038] Melt polypropylene at 170°C according to No. 3 formula in Table 1, and the melted viscosity is 16 poises, then add alumina powder and silica powder weighed according to formula 3 into the melt, continue heating and stirring To mix evenly, the viscosity reaches 26 poise.

[0039] The above-mentioned melt is added into a liquid storage tank with a nozzle, and a dry filament is used to obtain an alumina continuous fiber precursor containing alumina.

[0040] The fiber precursors were first baked at 50°C for 10 minutes, then degreased at a low temperature (room temperature to 500°C) at a heating rate of 5°C / min, and then heated to 1700°C at a heating rate of 2°C / min for firing. Keep the temperature at 1700°C for 2 hours to obtain continuous alumina-based fibers.

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Abstract

The invention discloses a method for preparing alumina-based continuous fiber, which comprises the following steps: adding alumina and alumina silica powder to melting polypropylene by using the viscosity of the melting polypropylene, wherein, the melting point thereof can be reduced by adding paraffin, and the surface activity and lubricity thereof can be improved by adding stearic acid; then, subjecting the melting polypropylene to dry spinning, drying and degreasing to remove polymers; and finally, firing at a high temperature to obtain the alumina-based continuous fiber with the diameter thereof being 10 to 100 mum. The prepared alumina-based continuous fiber has good toughness and can be wound around a guide roller; and the cross-section of the continuous fiber is dense, thereby satisfying special operating requirements, such as fiber preform of composite materials or other structural materials.

Description

technical field [0001] The invention relates to a method for preparing alumina-based continuous fibers that can be used as winding, lamination or other two-dimensional and three-dimensional weaving. Background technique [0002] Alumina-based fiber is a kind of high-performance inorganic fiber. It starts with Al 2 o 3 As the main component, it contains other metal oxide additives, such as SiO 2 and B 2 o 3 Wait. Alumina fiber has high strength, high modulus, excellent heat resistance and high temperature oxidation resistance. Compared with other fibers, it can maintain its excellent strength at higher temperatures. Alumina fiber has the form of long fiber, short fiber, whisker, etc., and can be made into various shapes such as cloth, belt, rope, etc. Alumina fiber has good surface activity and is easy to compound with metal and ceramics. It can be used to manufacture fiber-reinforced metal matrix and ceramic matrix composite materials; it has the advantages of small t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08
Inventor 杨建锋张亚彬王波谭宏斌丁亚平王红洁乔冠军
Owner XI AN JIAOTONG UNIV