Continuous aluminium oxide base ceramic fibre preparation method

A ceramic fiber and ceramic-based technology, which is applied in the direction of artificial filaments made of inorganic raw materials, can solve the problems of affecting the uniformity of fiber microstructure, difficulty in dispersing ceramic powder, and unfavorable mechanical properties, so as to suppress the tendency of cracking and avoid instability The effect of strong adaptability and process adaptability

Active Publication Date: 2009-03-11
FUJIAN ESTABLISHED YATE TAO CO LTD
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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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  • Continuous aluminium oxide base ceramic fibre preparation method
  • Continuous aluminium oxide base ceramic fibre preparation method
  • Continuous aluminium oxide base ceramic fibre preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (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.

[0031] (2) 11.18g ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) was dissolved in 40ml of absolute ethanol, 10ml of ammonia solution (1%) was added, after hydrolysis at 60°C for 24h, dilute hydrochloric acid was added to adjust the pH value to 4, and a silica sol with an average particle diameter of 30nm was obtained.

[0032] (3) 5 g of polyvinyl alcohol with an average degree of polymerization of 1750 and a degree of alcoholysis of 99% is dissolved in 95 g of water to form a 5% solution to obtain a spinning aid.

[0033] (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 mi...

Embodiment 2

[0039] (1) Heat 100ml of aluminum trichloride aqueous solution (2mol / L) and 18.2g of metal aluminum foil to reflux for 12h, and the aluminum foil is completely dissolved. After the resulting liquid was cooled, it was filtered with filter paper to obtain a clear alumina sol.

[0040] (2) 18.24g methyl orthosilicate (Si(OCH 3 ) 4 ) was dissolved in 60ml of absolute ethanol, 10ml of ethylenediamine aqueous solution (0.5%) was added, hydrolyzed at 50°C for 12 hours to obtain a silica sol, and dilute hydrochloric acid was added to adjust the pH value to 3.5 to obtain silica with an average particle size of 10nm Sol.

[0041] (3) 20 g of polyvinylpyrrolidone (K90) was dissolved in 80 g of water to form a 20% solution to obtain a spinning aid.

[0042] (4) After stirring and mixing the aluminum sol obtained in step (1) with the silica sol obtained in step (2), then add 40 g of spinning aid obtained in step (3), and stir and mix it at 70 Concentrate under reduced pressure at °C to...

Embodiment 3

[0048] (1) Heat 1000ml aluminum nitrate aqueous solution (0.3mol / L) and 48.6g metal aluminum foil to reflux for 24 hours, and the aluminum foil is completely dissolved. After the resulting liquid was cooled, it was filtered with filter paper to obtain a clear alumina sol.

[0049] (2) 145.8g ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) was dissolved in 500ml of absolute ethanol, 20ml of hexamethylenetetramine aqueous solution (20%) was added, hydrolyzed at 70°C for 18h to obtain a silica sol, and dilute hydrochloric acid was added to adjust the pH value to 3 to obtain a silica sol with an average particle diameter of 100nm. Silica sol.

[0050] (3) 10 g of polyacrylic acid having an average degree of polymerization of 100,000 was dissolved in 90 g of water to form a 10% solution to obtain a spinning aid.

[0051] (4) After stirring and mixing the aluminum sol obtained in step (1) with the silica sol obtained in step (2), then add 100 g of spinning aid obtained in step (3), and t...

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Abstract

The invention provides a method for preparing a continuous alumina-based ceramic fiber, which relates to an alumina-based ceramic fiber, in particular to a method for preparing a continuous alumina-based ceramic fiber which takes alumina as a main component and adds a second component as a crystalling phase inhibitor. The invention provides a method for preparing the continuous alumina-based ceramic fiber, which is simple in technique and low in cost. The method comprises the steps: preparing alumina sol; preparing silicon dioxide sol; mixing the alumina sol and the silicon dioxide sol to obtain biphase sol, and adding a spinning addition agent into the biphase sol; condensing the biphase sol added with the addition agent and spinning by a dry method to obtain the gel fiber; pyrolyzing the gel fiber to obtain the ceramic fiber; and sintering the ceramic fiber to obtain the continuous alumina-based ceramic fiber.

Description

technical field [0001] The invention relates to an alumina-based ceramic fiber, in particular to a preparation method for a continuous alumina-based ceramic fiber which takes alumina as the main component and adds a second component as a crystal phase inhibitor. Background technique [0002] Alumina (Al 2 o 3 ) based ceramic fiber with Al 2 o 3 As the main component, its content is generally greater than 70%, and some also contain other metal oxides (such as SiO 2 ), in the form of long fiber, short fiber, etc., is a high-performance inorganic fiber. The outstanding advantages of alumina fiber are high strength, high modulus, heat resistance and high temperature oxidation resistance. Compared with carbon fiber and metal fiber, its surface activity is good, it is easy to compound with metal and ceramic matrix, not only can maintain good tensile strength in high temperature oxidative environment, but also compared with other high-performance inorganic fibers such as silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/624D01F9/08
Inventor 陈立富张力兰琳林昆仑叶鑫南张立同
Owner FUJIAN ESTABLISHED YATE TAO CO LTD
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