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Preparation method of SiC whisker reinforced mullite anti-oxidation coating

A technology of anti-oxidation coating and mullite, applied in the field of high-temperature anti-oxidation/anti-corrosion coating preparation, can solve the problems of complex preparation process, low efficiency, poor coating performance, etc.

Active Publication Date: 2016-01-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current main preparation technologies, such as chemical vapor deposition (CVD), brush coating, embedding and infiltration, etc., generally have poor coating performance, complicated preparation process, low efficiency, high cost, and expensive equipment. insufficient

Method used

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  • Preparation method of SiC whisker reinforced mullite anti-oxidation coating
  • Preparation method of SiC whisker reinforced mullite anti-oxidation coating
  • Preparation method of SiC whisker reinforced mullite anti-oxidation coating

Examples

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Effect test

Embodiment 1

[0052] Preparation of SiC coating by embedding method: first, 180g Si powder, 90g SiC powder, 15g carbon powder, 15gAl 2 o 3 Put it in a ball mill jar and wet grind it at a speed of 200r / min for 24 hours, take it out, put it in a drying oven at 90°C for 12 hours, and then sieve it with a 60-mesh sieve to obtain the embedding powder.

[0053] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1750°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample.

[0054] Preparation of SiC whisker toughened mullite outer coating by sol-gel method: 1) Dissolve 10.4165g tetraethyl orthosilicate and 56.247g Al(NO3)3·9H2O in 14mL ethanol, add 1.800g glacial acetic acid Reflux for 4 hours under heat...

Embodiment 2

[0056] Preparation of SiC coating by embedding method: first, put 260g of Si powder, 96g of SiC powder, 40g of carbon powder, and 4g of Al2O3 in a ball mill jar for 24 hours at a speed of 200r / min, then take it out, and dry it in a drying oven at 90°C for 12 hours , and then sieved with a 60-mesh sieve to obtain the embedding powder.

[0057] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1800°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample.

[0058] Preparation of SiC whisker toughened mullite outer coating by sol-gel method: 1) Dissolve 41.666g of tetraethyl orthosilicate and 224.988g of Al(NO3)3·9H2O in 200mL of ethanol, add 30g of glacial acetic acid Reflux for 4 hours ...

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Abstract

The invention relates to a preparation method of a SiC whisker reinforced mullite anti-oxidation coating and belongs to the technical field of preparation of high-temperature anti-oxidation / anti-corrosion coatings. A preparation route comprises steps as follows: firstly, high-performance mullite precursor sol is synthesized with a sol-gel method, then SiC whiskers are dispersed uniformly into the mullite precursor sol in a manner of ultrasound and later ball-milling, a SiC whisker reinforced mullite coating precursor suspension is obtained, then the coating precursor suspension is applied to the surface of a substrate with a high-precision dip-coating process, and finally, the SiC whisker reinforced mullite coating can be obtained after coating sintering. The preparation method breaks through a preparation technology of a whisker reinforced high-temperature anti-oxidation composite coating on the basis of the sol-gel process, has the advantages of simple process, low cost, high efficiency, high substrate shape adaptability and the like and has broad development prospect.

Description

technical field [0001] The invention relates to a preparation method of SiC whisker toughened mullite anti-oxidation coating, which belongs to the technical field of high-temperature anti-oxidation / anti-corrosion coating preparation. Background technique [0002] Carbon / carbon composite (C / C) has a series of excellent characteristics such as low thermal expansion coefficient, low density, thermal conductivity and mechanical properties at high temperature, as well as ablation resistance, corrosion resistance and stable friction coefficient, making it a It is a high-temperature structural material with great development potential and broad application prospects. However, the oxidation failure of carbon / carbon composites in high-temperature oxidative environments restricts the promotion of its application range. Studies have shown that anti-oxidation coatings are an effective technical approach to solve the problem of high-temperature oxidation of carbon / carbon composites. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/185
Inventor 肖鹏文中流李专
Owner CENT SOUTH UNIV
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