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A kind of preparation method of SIC whisker toughened mullite anti-oxidation coating

An anti-oxidation coating, mullite technology, 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: 2018-02-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of SIC whisker toughened mullite anti-oxidation coating
  • A kind of preparation method of SIC whisker toughened mullite anti-oxidation coating
  • A kind of preparation method of SIC whisker toughened mullite anti-oxidation coating

Examples

Experimental program
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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, 15g Al 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 hea...

Embodiment 2

[0056] Preparation of SiC coating by embedding method: First, put 260g Si powder, 96g SiC powder, 40g carbon powder, 4g Al2O3 in a ball mill jar and wet grind it at a speed of 200r / min for 24h, then take it out, put it in a drying oven at 90°C Dry for 12 hours, and then sieve through 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 und...

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Abstract

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. The preparation route is as follows: firstly, the high-performance mullite precursor sol is synthesized by the sol-gel method, and then SiC whiskers are uniformly dispersed into the mullite precursor sol by ultrasonication and then ball milling to obtain SiC whisker toughening. Mullite coating precursor suspension, and then use high-precision dip-pulling process to coat the coating precursor suspension on the surface of the substrate material, and finally complete the coating sintering to obtain SiC whisker toughened mullite coating Floor. This method breaks through the preparation technology of whisker-toughened high-temperature anti-oxidation composite coating based on sol-gel process. It has many advantages such as simple process, low cost, high efficiency and high substrate shape adaptability, and has broad development prospects.

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 Patents(China)
IPC IPC(8): C04B35/81C04B35/185
Inventor 肖鹏文中流李专
Owner CENT SOUTH UNIV
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