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Carbon fiber reinforced alumina ceramic composite material and preparation method thereof

A technology of alumina ceramics and composite materials, applied in the field of materials, can solve the problems of catastrophic decline in material properties, easy oxidation of carbon fibers, expensive silicon carbide fibers, etc., to reduce equipment requirements and energy consumption, small thermal expansion coefficient, and cross-section infiltration. good effect

Active Publication Date: 2017-07-21
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0005] Carbon fiber has high specific strength, specific modulus and fatigue strength, and is a good reinforcement material, but carbon fiber is very prone to oxidation above 400 °C, resulting in a catastrophic decline in material performance
Silicon carbide fiber is also a good reinforcement material, its heat resistance and oxidation resistance are better than carbon fiber, but silicon carbide fiber is very expensive, which limits its range of use

Method used

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  • Carbon fiber reinforced alumina ceramic composite material and preparation method thereof

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preparation example Construction

[0024] Such as figure 1 As shown, a method for preparing a carbon fiber reinforced alumina ceramic composite material according to an embodiment of the present invention includes the following steps:

[0025] S101: Using aluminum sol as a precursor, vacuum impregnate carbon felt, and then densify the carbon felt impregnated with aluminum sol to prepare carbon fiber-reinforced alumina ceramics. Specifically, first use aluminum nitrate sol as a precursor to vacuum impregnate the carbon felt after ultrasonic cleaning, and then dry it. After drying, put it into a high-temperature furnace for vacuum sintering, keep vacuum cooling to room temperature, and complete a densification process. Then repeat the above steps 10 to 12 times until the weight of the sample no longer increases, so as to obtain carbon fiber reinforced alumina composite ceramics. As the reinforcement of alumina ceramics, carbon fiber has high specific strength and specific modulus, no creep, good fatigue resistan...

Embodiment 1

[0030] Embodiment 1 is a specific preparation process of a carbon fiber reinforced alumina ceramic composite material, which uses alumina as a matrix, polyacrylonitrile-based carbon felt as a reinforcement, and a Si-Al-C oxidation-resistant coating on the surface, including The following specific steps:

[0031]Take 100g of aluminum nitrate, add deionized water, heat and stir in a water bath, wherein the temperature of the water bath is set at 85°C, and continue to stir in the water bath for 30-40 minutes to hydrolyze the aluminum nitrate as much as possible. Then add 12.5% ​​ammonia water in batches until the pH of the liquid is 3.5-5. While further promoting hydrolysis, the properties of the sol are stabilized and the size of the colloidal particles is adjusted. Then evaporate the liquid, so that the concentration of aluminum ions is 6mol / L, and the viscosity is about 6mPa·S. This concentration and viscosity can increase the impregnation efficiency as much as possible while ...

Embodiment 2

[0038] Embodiment 2 is a specific preparation process of a carbon fiber reinforced alumina ceramic composite material, which uses alumina as a matrix, polyacrylonitrile-based carbon felt as a reinforcement, and a Si-Al-C oxidation-resistant coating on the surface, including The following specific steps:

[0039] Take 100g of aluminum nitrate, add deionized water, heat and stir in a water bath, wherein the temperature of the water bath is set at 90°C, and continue to stir in the water bath for 30-40 minutes to hydrolyze the aluminum nitrate as much as possible. Then add 15% ammonia water in batches until the pH of the liquid is 3.5-5, further promote the hydrolysis, stabilize the properties of the sol, and adjust the size of the colloidal particles. Then evaporate the liquid so that the concentration of aluminum ions is 5mol / L and the viscosity is about 6mPa·S. This concentration and viscosity can increase the impregnation efficiency as much as possible while ensuring the impre...

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Abstract

The present invention relates to a carbon fiber reinforced alumina ceramic composite material and a preparation method thereof. The preparation method comprises: S101: carrying out vacuum impregnation on a carbon felt by using an aluminum sol as a precursor, and carrying out densifying treatment on the obtained carbon felt to prepare a carbon fiber reinforced alumina ceramic; and S102: carrying out vacuum impregnation on the carbon fiber reinforced alumina ceramic by using a sol-gel method, drying, sintering, and cooling to a room temperature to prepare a Si-Al-C coating. According to the present invention, the preparation method has advantages of short preparation period and low cost; and the prepared carbon fiber reinforced alumina ceramic composite material has advantages of excellent mechanical property and excellent high-temperature resistance.

Description

technical field [0001] The invention relates to the field of materials, in particular to a carbon fiber reinforced alumina ceramic composite material and a preparation method thereof. Background technique [0002] Alumina ceramics have the advantages of high melting point, good high temperature chemical stability, high modulus and strength, etc., and can be used for a long time in high temperature oxidizing environment. However, bulk alumina ceramics generally have low toughness and are prone to catastrophic failure, which limits its application in engineering structures. In order to improve the mechanical properties of alumina ceramics, various toughening mechanisms have been widely used, mainly including particle reinforcement, whisker reinforcement and fiber reinforcement, among which particle and whisker toughening can significantly improve the strength of alumina ceramics, but for The increase in toughness is low, and the particle and whisker toughened alumina ceramics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B41/87C04B35/624
CPCC04B35/624C04B35/803C04B41/5057C04B41/87C04B2235/3217C04B2235/5248C04B2235/616
Inventor 罗瑞盈李小孟
Owner BEIHANG UNIV
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