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Preparation method of alumina coating of silicon carbide fiber surface

A silicon carbide fiber, alumina coating technology, applied in fiber processing, textiles and papermaking, etc., can solve the problems of insufficient anti-oxidation performance, reduced performance of SiC materials, affecting service life, etc., and achieves large specific surface area and simple method. , the effect of uniform particle size distribution

Inactive Publication Date: 2015-12-09
SUZHOU IND PARK HIGH PERFORMANCE CERAMIC FIBER ENG CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a non-oxide material, SiC material has insufficient oxidation resistance, which will reduce the performance of SiC material and affect its service life.

Method used

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  • Preparation method of alumina coating of silicon carbide fiber surface
  • Preparation method of alumina coating of silicon carbide fiber surface
  • Preparation method of alumina coating of silicon carbide fiber surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 400g of deionized water into the three-necked flask, heat it to 80°C, and put the pre-ground 4g of Al(OC 3 h 7 ) 3 Add the powder slowly, and stir at 90°C for 2 hours after the addition, so that the Al(OC 3 h 7 ) 3 Complete hydrolysis to form Al(OH) 3 Precipitate, make the C produced by the reaction as much as possible under stirring conditions 3 h 7 The OH is completely volatilized; then the peptizer HCl is added dropwise, and the pH value of the solution is controlled in the range of 3-4 to peptize the precipitate; finally, the stable and transparent AlOOH sol is obtained by aging for 16 hours under reflux and stirring at 90°C.

[0020] Soak uncoated SiC fibers in AlOOH sol for 2 hours, then dry at 100°C for 2 hours, and perform gelation treatment to obtain SiC fibers coated with AlOOH sol; place the above-treated SiC fibers in a tube furnace under nitrogen Under the condition of protection, heating to 800°C and keeping it for 2h, the Al 2 o 3 Coated SiC ...

Embodiment 2

[0022] Add 400g of deionized water into the three-necked flask, heat it to 80°C, and put the pre-ground 2g of Al(OC 3 h 7 ) 3 Add the powder slowly, and stir at 90°C for 2 hours after the addition, so that the Al(OC 3 h 7 ) 3 Complete hydrolysis to form Al(OH) 3 Precipitate, make the C produced by the reaction as much as possible under stirring conditions 3 h 7 The OH is completely volatilized; then the peptizer HCl is added dropwise to control the pH value of the solution in the range of 3-4 to peptize the precipitate; finally, the stable and transparent AlOOH sol is obtained by aging for 15 hours under reflux and stirring at 90°C.

[0023] Soak uncoated SiC fibers in AlOOH sol for 3 hours, dry at 95°C for 2 hours, and perform gelation treatment to obtain SiC fibers coated with AlOOH sol; place the treated SiC fibers in a tube furnace under nitrogen Under the condition of protection, heating to 700°C and keeping it for 2h, the Al 2 o 3 Coated SiC fibers, Al 2 o 3 T...

Embodiment 3

[0025] Add 400g of deionized water into the three-necked flask, heat it to 80°C, and mix the pre-ground 0.8g of Al(OC 3 h 7 ) 3 Add the powder slowly, and stir at 90°C for 2 hours after the addition, so that the Al(OC 3 h 7 ) 3 Complete hydrolysis to form Al(OH) 3 Precipitate, make the C produced by the reaction as much as possible under stirring conditions 3 h 7 OH evaporates completely; then add HNO dropwise 3 , control the pH value of the solution in the range of 3-4 to peptize the precipitate; finally, under reflux and stirring at 90°C, age for 13h to obtain a stable and transparent AlOOH sol.

[0026] Soak uncoated SiC fibers in AlOOH sol for 4 hours, then dry at 90°C for 2 hours, and perform gelation treatment to obtain SiC fibers coated with AlOOH sol; place the above-treated SiC fibers in a tube furnace under nitrogen Under the condition of protection, heating to 600°C and keeping it for 2h, the Al 2 o 3 Coated SiC fibers, Al 2 o 3 The coating thickness is ...

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Abstract

The invention discloses a preparation method of an alumina coating of a silicon carbide fiber surface, comprising: coating uncoated silicon carbide silicon carbide fiber by using AlOOH sol, and then performing heat treatment, and accordingly the alumina coating silicon carbide fiber is made. The invention has advantages of simple preparation method, low requirements for equipment, increased high temperature oxidation resistance for the materials without destroying inner structures of materials and ensuring the high level of the original mechanical properties of materials, thereby promoting usage temperature and widening the usage range of products.

Description

technical field [0001] The invention relates to a method for preparing an alumina coating on the surface of silicon carbide fibers, and belongs to the field of preparation of high-temperature resistant ceramic fibers. Background technique [0002] With the development of the aerospace industry, the performance requirements of new materials are becoming more and more stringent, and there is an urgent need to develop new materials with high performance. Silicon carbide (SiC) ceramic fiber has excellent properties such as high temperature resistance, low density, high strength, high modulus, wear resistance, and corrosion resistance, and is an ideal composite material reinforcement. However, as a non-oxide material, SiC material has insufficient oxidation resistance, which will reduce the performance of SiC material and affect its service life. To improve the oxidation resistance of SiC, in addition to improving the oxidation resistance of the material itself, coating the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/45
Inventor 田秀梅冯春祥李凯娜何立军杜亮陈虎
Owner SUZHOU IND PARK HIGH PERFORMANCE CERAMIC FIBER ENG CENT CO LTD
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