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A kind of preparation method of aluminum oxide coating on the surface of silicon carbide fiber

A silicon carbide fiber, alumina coating technology, applied in the coating, metal material coating process, solid-state chemical plating and other directions, can solve the problem of not involving the oxidation resistance of silicon carbide fiber, and achieve low cost and uniformity. Distributed shedding, easy-to-control effects

Active Publication Date: 2017-11-03
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-mentioned invention mainly improves the electrical conductivity and mechanical properties of silicon carbide fibers by using the coating method, but does not involve the oxidation resistance of silicon carbide fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1000g deionized water into the three-mouth flask, weigh 200g aluminum acetate, weigh glycerol and acetic acid according to the molar ratio of aluminum acetate: glycerol: acetic acid = 1:0.7:0.3, and add the above raw materials in batches to deionized Water, until one batch is hydrolyzed, then add the next batch, and dissolve completely at the end. Ammonia water was added dropwise to the solution until the pH value was 9.5 to obtain a precipitate, which was rinsed with deionized water and then suction filtered. Add the precipitate to deionized water again to disperse, add a certain amount of nitric acid solution to the solution, adjust the pH of the solution to 4, heat and stir the solution at 80°C for 10 hours to prepare alumina sol.

[0020] According to the mass ratio of silicon carbide fiber: alumina sol = 1:5, weigh the silicon carbide fiber, put the silicon carbide fiber into the dipping tank filled with alumina sol and soak for 2 hours, and at the same time as...

Embodiment 2

[0022] Add 1500g deionized water into the three-mouth flask, weigh 300g aluminum acetate, weigh glycerol and acetic acid according to the molar ratio of aluminum acetate: glycerol: acetic acid = 1:0.8:0.4, and add the above raw materials in batches to deionized Water, until one batch is hydrolyzed, then add the next batch, and dissolve completely at the end. Ammonia water was added dropwise to the solution until the pH value was 9.2 to obtain a precipitate, which was rinsed with deionized water and filtered with suction. The precipitate was re-distributed in deionized water, a certain amount of nitric acid solution was added to the solution, and the pH of the solution was adjusted to 4.5, and the solution was refluxed at 80°C for 15 hours with stirring to prepare alumina sol.

[0023] According to the mass ratio of silicon carbide fiber: alumina sol = 1:6, weigh the silicon carbide fiber, put the silicon carbide fiber into the dipping tank filled with alumina sol and soak for ...

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PUM

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Abstract

The invention discloses a method for preparing an alumina coating on the surface of silicon carbide fibers. The main operation steps include: adding aluminum acetate, glycerol and acetic acid into deionized water according to the proportions, and after dissolving them, adding ammonia water dropwise to adjust The pH value of the precipitate is obtained, the precipitate is rinsed with deionized water and then filtered with suction. The precipitate is added to deionized water to disperse, and nitric acid solution is added to the solution, and the alumina sol is obtained after refluxing, heating and stirring. The silicon carbide fiber is dipped into a dipping tank containing alumina sol, and after drying and heat treatment, a silicon carbide fiber coated with an alumina surface layer is finally obtained. The alumina coating has extraordinary oxidation resistance, which can greatly improve the high-temperature performance of silicon carbide fibers, and the alumina coating has good adhesion to silicon carbide fibers, and the coating is evenly distributed on the fiber surface and is not easy to fall off.

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 on the surface of a silicon carbide fiber. Background technique [0002] Silicon carbide fiber has the characteristics of high strength, high modulus, high temperature resistance, oxidation resistance, creep resistance, chemical corrosion resistance, salt spray resistance and excellent electromagnetic wave absorption. It has good compatibility with metal, resin and ceramic substrates. It can be used in It is used as a reinforcing material for heat-resistant and oxidation-resistant materials and high-performance composite materials in many fields, especially in high-temperature oxidation resistance, and is especially suitable as the main material for thermal structural materials such as aero-engines. At present, the main methods for preparing continuous silicon carbide fibers include chemical vapor deposition, micropowder sinter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08
Inventor 陈照峰王飞
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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