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Method for preparing SiC whisker and C-AlPO4 powder synergistic modification mullite coating

A synergistic modification and mullite technology, which is applied in the field of high-temperature anti-oxidation/anti-corrosion coating preparation, can solve the difficulties in the preparation of large components and special-shaped parts, poor bonding between the coating and the substrate, and difficult precise control of coating thickness and other problems, to achieve the effect of improving easy cracking, low preparation cost, and excellent bonding performance

Active Publication Date: 2019-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the existing preparation processes such as electron beam physical vapor deposition and atmospheric plasma spraying have the problems of expensive equipment and high production cost; while the coating prepared by sol-gel combined with dipping-pulling method will have coatings at the corners Uneven fine distribution and poor bonding between the coating and the substrate make it difficult to achieve precise control of the coating thickness. The most important thing is that it is difficult to meet the preparation of large components and special-shaped parts.

Method used

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  • Method for preparing SiC whisker and C-AlPO4 powder synergistic modification mullite coating
  • Method for preparing SiC whisker and C-AlPO4 powder synergistic modification mullite coating
  • Method for preparing SiC whisker and C-AlPO4 powder synergistic modification mullite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1 Preparation of mullite precursor gel by sol-gel method

[0044] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of absolute ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain a mullite precursor to obtain a milky white mullite precursor gel A;

[0045] Step 2 Preparation of mullite powder by sol-gel method

[0046] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain the mullite precursor gel. Gel and gel are dried at 60-80°C for 72 hours, then ball-milled at 200r / min for 2 hours, then put into a muffle furnace, set the heating rate at 5°C / min, kept at 1300°C for 2 hours, and then coole...

Embodiment 2

[0054] Step 1 Preparation of mullite precursor gel by sol-gel method

[0055] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of absolute ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain a mullite precursor to obtain a milky white mullite precursor gel A;

[0056] Step 2 Preparation of mullite powder by sol-gel method

[0057] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain the mullite precursor gel. Gel and gel are dried at 60-80°C for 72 hours, then ball-milled at 200r / min for 2 hours, then put into a muffle furnace, set the heating rate at 5°C / min, kept at 1300°C for 2 hours, and then coole...

Embodiment 3

[0065] Step 1 Preparation of mullite precursor gel by sol-gel method

[0066] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of absolute ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain a mullite precursor The gel was left to age in a sealed environment at room temperature for 4 to 6 months to obtain a milky white mullite precursor gel A.

[0067] Step 2 Preparation of mullite powder by sol-gel method

[0068] Dissolve 20.83g of tetraethyl orthosilicate and 112.53g of aluminum nitrate nonahydrate in 100ml of ethanol, add 3.60g of glacial acetic acid, heat and react in a water bath at 60°C for 4 hours, then raise the temperature to 80°C for 16 hours in a water bath to obtain the mullite precursor gel. Gel and gel are dried at 60-80°C for 72 hours, then ball-milled at 200r / min for 2 hours, then put into a muffl...

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Abstract

The invention relates to a method for preparing a SiC whisker and C-AlPO4 powder synergistic modification mullite coating. A C / SiC composite material is selected as a matrix, a SiC inner coating is prepared by a chemical vapor deposition method, a SiC whisker and C-AlPO4 powder synergistic modification mullite coating precursor is prepared on a SiC inner coating-coated C / SiC composite material bya sol-gel process combined with air spray coating, and the SiC whisker and C-AlPO4 powder synergistic modification mullite coating precursor is sintered to finally obtain the SiC whisker and C-AlPO4 powder synergistic modification mullite coating. The method improves the defects of the coating prepared by a traditional sol-gel process, such as easy cracking, uneven distribution and low bonding strength, can meet the thickness control of a micron-scale coating, has simple preparation process, low preparation cost and high preparation efficiency, can meet many advantages such as large componentand heterogeneous component preparation, is convenient for large-scale industrial application, and has broad development prospects.

Description

technical field [0001] The invention relates to a SiC whisker and C-AlPO 4 The invention discloses a method for preparing a powder synergistically modified mullite coating, which belongs to the technical field of high-temperature anti-oxidation / anti-corrosion coating preparation. Background technique [0002] C / SiC composite materials have certain oxidation resistance and good mechanical properties, showing the characteristics of low density, high strength, high toughness, high temperature resistance, ablation resistance, erosion resistance, high hardness and high wear resistance. C / SiC composite materials have broad application prospects in high-performance weaponry, aerospace, energy technology, chemical industry, transportation industry and other fields. However, since the carbon fiber and matrix carbon start to oxidize above 400°C, the SiC matrix starts to oxidize to SiO at a temperature above 1200°C 2 film, SiO 2 The film will react with the water vapor in the enviro...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/81C04B35/622C04B35/624C04B35/626C04B41/89
Inventor 李杨肖鹏陈鹏举李专
Owner CENT SOUTH UNIV
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