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Method for preparing ZrO2-SiO2-SiC coated C/C composite material by adopting sol-gel method

A zro2-sio2-sic, composite material technology, applied in the field of advanced composite anti-oxidation coating materials, can solve the problems of limited service life of the coating, limited application of glass coating, low anti-oxidation temperature, etc. Antioxidant performance, high purity effect

Inactive Publication Date: 2021-05-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, glass coatings have good self-healing properties, but their volatility and fluidity defects at high temperatures lead to low oxidation resistance temperatures, which greatly limits the application of glass coatings in the field of oxidation resistance.
Metal coatings and ceramic coatings have high melting points and high heat-resistant temperatures, but the coatings will fall off from the surface of the C / C composite material at high temperatures, resulting in limited service life of the coatings

Method used

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  • Method for preparing ZrO2-SiO2-SiC coated C/C composite material by adopting sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The prepared SiO 2 Sol, ZrO 2 The sol was mixed according to the Zr:Si molar ratio of 80:20, and magnetically stirred at room temperature for 1.5h. Then the SiC-coated C / C composite sample prepared by 7% MTES sol was impregnated in ZrO 2 -SiO 2 In the sol, when there are no obvious air bubbles escaping from the surface of the sample, place it in an oven at 80°C for 2 hours, and repeat this process. Put the above-mentioned C / C composite material sample into a graphite crucible, place it in a high-temperature carbonization furnace, use high-purity nitrogen as a protective atmosphere, control the temperature rise rate of the carbonization furnace to 5°C / min, and lower the furnace temperature from room temperature to Rise to 900°C for 2 hours and 1350°C for 1 hour to produce ZrO 2 -SiO 2 - SiC coating. The coating was isothermally oxidized in air at 1000°C for 1 h, and the mass loss rate was about 9.3%.

Embodiment 2

[0025] SiO 2 Sol, ZrO 2 The sol was mixed according to the Zr:Si molar ratio of 0:100, and the other conditions were the same as in Example 1. The C / C mixed coating material obtained failed to protect the C / C composite material very well.

Embodiment 3

[0027] SiO 2 Sol, ZrO 2 The sol was mixed according to the Zr:Si molar ratio of 20:80, and the other conditions were the same as in Example 1. The C / C mixed coating material obtained failed to protect the C / C composite material very well.

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Abstract

The invention discloses a method for preparing a ZrO2-SiO2-SiC coated C / C composite material by adopting a sol-gel method, and belongs to the technical field of advanced composite anti-oxidation coating materials. The method comprises the following steps: firstly, preparing a SiC coating uniformly coating the surface of a C / C composite material, and then preparing a ZrO2-SiO2 binary mixed sol coating by adopting a sol-gel method; and dipping a SiC coated C / C composite material sample in ZrO2-SiO2 sol at normal pressure, and then carrying out drying and high-temperature heat treatment processes to prepare the high-purity ZrO2-SiO2-SiC ternary mixed sol coating. The composite coating can uniformly and compactly cover the C / C composite material, so the oxidation resistance of the C / C composite material is greatly improved. Defects such as micropores and cracks on the surface of the single-layer SiC coating are filled with SiO2 and ZrO2, so that the compactness of the coating is greatly improved, and the composite coating material with extremely high oxidation resistance is obtained.

Description

technical field [0001] A kind of adopting sol-gel method to prepare ZrO 2 -SiO 2 -The method for SiC coating C / C composite material belongs to the technical field of advanced composite anti-oxidation coating materials. Background technique [0002] C / C composite material is a carbon matrix composite material with carbon fiber as a reinforcing phase, which has many excellent properties, such as low density, thermal shock resistance, friction resistance, ablation resistance, high strength and high modulus, and low thermal expansion coefficient. Moreover, with the increase of temperature, the mechanical properties of C / C composite materials are also enhanced, so they have been widely used in many fields such as aerospace, military and biomedicine. However, when the C / C composite material is in an oxygen atmosphere greater than 370 °C, when the water vapor temperature exceeds 650 °C, CO 2 When the temperature exceeds 750 °C, oxidation reactions will occur, which greatly restr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/5059C04B41/87C04B41/009C04B35/83C04B41/4552C04B41/5035C04B41/5042C04B41/0072
Inventor 陈晓红卢亚平李孟
Owner BEIJING UNIV OF CHEM TECH
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