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Preparation method of aluminum oxide coating adopting silicon carbide fibers as matrix

A technology of alumina coating and silicon carbide fiber, which is applied in the field of preparation of alumina coating to achieve the effects of low human toxicity, not easy to peel off, and simple operation

Inactive Publication Date: 2015-12-23
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above inventions prepare alumina coatings on the surface of quartz fibers and metal substrates respectively, and their use has certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 1 mol / L aluminum acetate solution and 3 mol / L ammonia solution in a molar ratio of 1:4, and stir while mixing until the solution turns milky white and produces white precipitate. Filter the above solution and wash the precipitate with deionized water 4 times, then mix the precipitate with deionized water at a mass ratio of 1:5 and make it evenly dispersed, and add an appropriate amount of acetic acid solution to adjust the pH value to 5. Put the mixed solution into an 80° C. water bath and heat for 1.5 hours and keep stirring until a clear and transparent alumina sol is obtained.

[0019] The silicon carbide fiber was immersed in the prepared alumina sol, while ultrasonically oscillating for 1 hour, then heated to 80°C for drying for 10 hours, then heated to 700°C for 3 hours, and finally coated with alumina coating silicon carbide fibers.

Embodiment 2

[0021] Mix 1 mol / L aluminum acetate solution and 3 mol / L ammonia solution at a molar ratio of 1:5, and stir while mixing until the solution turns milky white and produces white precipitate. The above solution was filtered and the precipitate was washed 5 times with deionized water, and then the precipitate and deionized water were mixed according to the mass ratio of 1:6 and dispersed evenly, and an appropriate amount of acetic acid solution was added to adjust the pH value to 6. Put the mixed solution into a 90°C water bath and heat for 1 hour with stirring until a clear and transparent alumina sol is obtained.

[0022] The silicon carbide fiber was immersed in the prepared alumina sol, and ultrasonic vibration was performed for 1 hour, then the temperature was raised to 90°C for drying for 8 hours, and then heated to 600°C for heat treatment for 4 hours, and finally the aluminum oxide coating was obtained. silicon carbide fibers.

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Abstract

The present invention provides a preparation method of an aluminum oxide coating adopting silicon carbide fibers as matrix. The preparation method comprises: mixing an aluminum acetate solution and an ammonia water solution according to a certain ratio to obtain a milk white solution and produce white precipitate, filtering, washing the precipitate with deionized water, adding the precipitate to deionized water to uniformly disperse, adding an appropriate amount of an acetic acid solution, adding the mixed solution to a water bath pot, heating, maintaining the stirring until a clear transparent aluminum oxide sol is obtained, and immersing silicon carbide fibers into the prepared aluminum oxide sol to obtain the silicon carbide fibers having the aluminum oxide coating. According to the present invention, the used raw materials are aluminum acetate and ammonia water, such that the price is cheap, the cost is low, and the toxicity on human body is low; and the preparation method has characteristics of short time consumption, simple operation and no requirement of special equipment, and is suitable for mass production.

Description

technical field [0001] The invention relates to a method for preparing an alumina coating, in particular to a method for preparing an alumina coating with silicon carbide fiber as a matrix. Background technique [0002] Silicon carbide can be called corundum or refractory sand, which is the most widely used and most economical type of non-oxide high-tech refractory materials in the contemporary era. Silicon carbide fiber is an inorganic fiber made from organosilicon compound through spinning, carbonization or vapor deposition, which belongs to ceramic fiber. Continuous fiber is a continuous filament formed by coating silicon carbide on a core material such as tungsten wire or carbon fiber or spinning and pyrolysis to obtain pure silicon carbide filament. Silicon carbide fiber has many performance advantages, such as good chemical stability, good wear resistance, small thermal expansion coefficient, high strength and so on. According to its performance advantages, silicon c...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 陈照峰王飞
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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