Preparation method of mullite oxidation resistant coating

A technology of anti-oxidation coating and mullite, which is applied in the field of preparation of mullite anti-oxidation coating, can solve the problems such as difficulty in meeting the thickness requirements of anti-oxidation coating, low upper limit of coating thickness, easy cracking and peeling of coating, etc. , to avoid the phenomenon of coating peeling, improve the bonding interface, and eliminate the effect of coating cracking

Active Publication Date: 2015-10-28
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many shortcomings in the traditional sol-gel coating preparation process, which restricts its development and application.
The main defects are: 1) the coating is loose and porous, and the density is low; 2) the bonding between the coating and the substrate is poor, and the coating is easy to crack and peel off during drying or sintering; 3) the upper limit of the coating thickness is low, and it is difficult to Meet the thickness requirements of the anti-oxidation coating; 4) The preparation process needs to go through multiple coating-drying-sintering processes, and it is difficult to prepare a uniform and dense coating with an ideal thickness by a single coating

Method used

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  • Preparation method of mullite oxidation resistant coating
  • Preparation method of mullite oxidation resistant coating

Examples

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Effect test

Embodiment 1

[0063] 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.

[0064] 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.

[0065] Preparation of mullite outer coating by sol-gel method:

[0066] 1) 10.4165g ethyl orthosilicate and 56.247g Al(NO 3 ) 3 9H 2 O was dissolved in 14mL of ethanol, added 1.800g of glacial acetic acid, refluxed in a water bath...

Embodiment 2

[0070] Preparation of SiC coating by embedding method: first, 260g Si powder, 96g SiC powder, 40g carbon powder, 4g 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.

[0071] 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.

[0072] Preparation of mullite outer coating by sol-gel method:

[0073] 1) 41.666g tetraethyl orthosilicate and 224.988g Al(NO 3 ) 3 9H 2 Dissolve O in 200mL of ethanol, add 30g of glacial acetic acid, reflux in a water bath at 60°...

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Abstract

The invention relates to a preparation method of a mullite oxidation resistant coating, particularly to a method for preparing a mullite/SiC bilayer-structure oxidation resistant coating on the surface of a carbon/carbon composite material. The preparation method comprises the following steps: pre-calcining mullite powder A and mullite precursor powder B according to the mass ratio of (4-6):1 to prepare pre-calcined mullite powder A and mullite precursor powder B, preparing a coalescing agent and a drying inhibitor according to certain ratio, uniformly mixing the pre-calcined mullite powder A, the pre-calcined mullite precursor powder B, the coalescing agent and the drying inhibitor to obtain a sizing agent, dipping a matrix in the sizing agent, performing sizing agent coating by adopting the dip-coating technology, and after the sizing agent coating, calcining at 1480-1515 DEG C to obtain the mullite oxidation resistant coating. According to the invention, the technology is simple, the raw material is cheap and available, the industrial production is facilitated, and the obtained coating has the advantages of high uniformity and compactness, excellent binding property, and high high-temperature oxidation resistant capacity.

Description

technical field [0001] The invention relates to a method for preparing a mullite anti-oxidation coating, in particular to a method for preparing a mullite / SiC double-layer structure anti-oxidation coating on the surface of a carbon / carbon composite material. Background technique [0002] Due to its low thermal expansion coefficient, low density, high thermal and electrical conductivity, high strength and high modulus at high temperature, and a series of excellent characteristics such as ablation resistance, corrosion resistance, and stable friction coefficient, carbon / carbon composite materials have become a material with great development potential. It is a high-temperature structural material with broad application prospects, and has been widely used in aviation, aerospace, energy and petrochemical industries. However, since the oxidation initiation temperature of carbon / carbon composites is only 450°C, the oxidation failure in high-temperature oxidizing atmosphere has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B35/84
Inventor 肖鹏文中流李专
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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