High temperature resistant alumina ceramic fiber and its sol-gel preparation method

A high-temperature-resistant technology for alumina ceramics, applied in the field of ceramic fiber and its preparation, and sol-gel preparation of high-temperature-resistant alumina ceramic fiber, can solve the problem of high threshold for continuous filament preparation, limited application, and the use of alumina ceramic fiber temperature limitations etc.

Active Publication Date: 2020-09-25
GUOZHUANG NEW MATERIALS & TECH(JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages, but so far, the use temperature of all alumina ceramic fibers is limited to within 1500 °C
At the same time, the preparation threshold of continuous filament is extremely high, which limits its application in some important domestic occasions

Method used

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  • High temperature resistant alumina ceramic fiber and its sol-gel preparation method
  • High temperature resistant alumina ceramic fiber and its sol-gel preparation method
  • High temperature resistant alumina ceramic fiber and its sol-gel preparation method

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preparation example Construction

[0025] According to the first aspect of the present disclosure, a method for preparing high temperature resistant alumina ceramic fiber includes three key steps: (1) preparation of aluminum source spinning dope; (2) configuration of coagulation bath and sol-gel spinning ; (3) Drying and calcination of fiber. Specifically, such as figure 1 As shown, the preparation method includes: fully dissolving the aluminum source, organosiloxane, water, and acid catalyst in an organic solvent, reacting at a certain temperature for a certain period of time, then adding a tantalum source and a hafnium source, and stirring uniformly to prepare the spinning Silk dope; prepare an alkaline coagulation bath; spin the dope through the alkaline coagulation bath to form alumina gel fiber through sol-gel chemical conversion; and the alumina gel fiber is dried at room temperature and then calcined, Obtain high temperature resistant alumina ceramic fiber.

[0026] According to another embodiment of the p...

Embodiment 1

[0042] Disperse 80g of aluminum powder and 50g of aluminum isopropoxide in 200g of ethanol, and then add 5g of ethyl orthosilicate dropwise to it. After stirring, add 0.4g of deionized water and 0.2g of 36% hydrochloric acid. Stir and react at 80°C for 24 hours. Add 0.13g of tantalum powder and 5g of a mixture of hafnium dioxide and hafnium hydroxide to the above solution, and stir evenly to obtain spinning dope; take 1L of ethanol, add 0.08g of sodium hydroxide, and stir for 5 Obtain a coagulation bath within hours; control the temperature of the coagulation bath at 10°C, and then spin the prepared spinning dope into the coagulation bath and collect it with a roller to obtain alumina ceramic gel fibers; put the above alumina ceramic gel fibers at room temperature Drying for 5 hours, then calcining at 800°C for 30 minutes, 1000°C for 30 minutes, and finally at 1300°C for 10 minutes to obtain alumina ceramic fibers.

Embodiment 2

[0044] Disperse 80g of aluminum powder and 20g of aluminum chloride in 100g of methanol, and then add 1g of methyl orthosilicate dropwise to it. After stirring evenly, add 0.12g of deionized water and 0.06g of 36% hydrochloric acid. Stir and react at ℃ for 20 hours. Add 1g lithium tantalate and 2.5g hydrated hafnium oxychloride to the above solution, and stir evenly to prepare spinning dope; take 1L methanol, add 0.05g sodium hydroxide and stir for 2 hours to obtain solidification Bath; control the temperature of the coagulation bath at 50°C, and then spin the prepared spinning dope into the coagulation bath and collect it with a roller to obtain alumina ceramic gel fiber; dry the alumina ceramic gel fiber at room temperature for 24 hours Then calcined at 800°C for 10 minutes, 1000°C for 30 minutes, and finally at 1200°C for 20 minutes to obtain alumina ceramic fibers. The scanning electron microscope image of the alumina ceramic fiber prepared in this embodiment is as follows ...

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Abstract

The invention provides a high-temperature-resistant alumina ceramic fiber and a sol-gel preparation method thereof. The high-temperature-resistant alumina ceramic fiber has alumina accounting for 95%by mass, as well as little silicon, tantalum and hafnium, is 1-500 um in diameter and 1-500 m in length. The method of preparing the high-temperature-resistant alumina ceramic fiber comprises dissolving an aluminum source, organosiloxane, water and an acid catalyst fully in an organic solvent, allowing to react at a certain temperature for a certain time, adding a tantalum source and a hafnium source, stirring well to obtain a spinning dope; preparing an alkaline coagulating bath; spinning the spinning dope through the alkaline coagulating bath, and carrying out sol-gel chemical conversion toobtain an alumina gel fiber; drying the alumina gel fiber at room temperature, and calcining to obtain the high-temperature-resistant alumina ceramic fiber.

Description

Technical field [0001] The present disclosure relates to a ceramic fiber and a preparation method thereof, in particular to a sol-gel preparation method of high-temperature resistant alumina ceramic fiber, and belongs to the technical field of high-performance ceramic fiber preparation. Background technique [0002] Alumina ceramics is a ceramic material with alumina as the main component. It has good conductivity, excellent mechanical strength and high temperature resistance, as well as good wear resistance, high hardness, and light weight. It is widely used in Defense, aerospace, transportation, petroleum, construction, automotive, industry, special equipment and other fields. The application in the national economy and daily life is becoming more and more extensive. In terms of composition, alumina ceramics are divided into two types: ordinary type and high-purity type. (1) Ordinary alumina ceramics can be divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/624
Inventor 马小民王慧崔吟雪张德育李富萍
Owner GUOZHUANG NEW MATERIALS & TECH(JIANGSU) CO LTD
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