Reinforcement method for fibre-quartz ceramic-base composite material

A technology of composite materials and quartz ceramics, which is applied in the reinforcement of fiber-quartz ceramic matrix composite materials and the field of wave-transmitting materials, can solve the problems of poor mechanical properties and limited applications of fiber-quartz ceramic matrix composite materials, and meet requirements and improve Density uniformity, effect of enhancing binding force

Active Publication Date: 2009-12-02
ZHONGCAI HIGH NEW MATERIAL +1
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  • Abstract
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Problems solved by technology

[0006] Due to the poor mechanical properties of the original fiber-quartz ceramic matrix composite material, its application in large-size missile radomes with high Mach numbers is limited. Therefore, a method to improve the mechanical properties of the composite material is urgently needed to expand its application range. Meet the needs of aviation and aerospace products for large-scale radome materials

Method used

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  • Reinforcement method for fibre-quartz ceramic-base composite material

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Effect test

Embodiment 1

[0029] First prepare the sol slurry, the preparation method is as follows: fully mix 2mol absolute ethanol, 1mol acetylacetone and 1mol tetraethyl orthosilicate, then use hydrochloric acid to adjust the pH value of distilled water to 2.5, and slowly add it to the mixed solution, fully After stirring, it was sonicated in an ultrasonic wave for 30min.

[0030] The fiber fabric is immersed in the quartz slurry, and it is formed by liquid phase infiltration-in-situ solidification to prepare a composite material green body, and then the green body is immersed in the sol slurry prepared by the above method, and vacuum impregnated (vacuum pressure is 0.01MPa) , make the green body infiltrate the sol slurry, then gel at 70°C, heat treatment at 350°C, and get the product in 2 hours.

Embodiment 2

[0032] First prepare the sol slurry: fully mix 5mol absolute ethanol, 2mol glycerin and 3mol tetraethyl orthosilicate, then use nitric acid to adjust the pH value of distilled water to 2.2, and slowly add it to the mixed solution, stir it fully in the ultrasonic wave Sonicate for 30 min.

[0033] The fiber fabric is immersed in the quartz slurry, and then the fiber-reinforced composite body prepared by liquid phase infiltration-in-situ solidification is immersed in the above-mentioned sol-reinforced slurry, and vacuum impregnated (vacuum pressure is 0.008MPa), so that The composite body is infiltrated with sol slurry, then gelled at 75°C, and heat-treated at 400°C for 2 hours to obtain the product.

Embodiment 3

[0035] The reinforcement method of the fiber-quartz ceramic matrix composite material of the present invention, the fiber-quartz ceramic matrix composite material is subjected to sol-enhanced infiltration treatment, and the finished composite material is prepared through gelation and solidification, wherein the mole percentage of the ingredients of the sol slurry is composed of :

[0036] Analytical grade absolute ethanol 30%

[0037] Analytical grade ethyl orthosilicate 10%

[0038] Distilled water 45%

[0039] Acetylacetone 15%.

[0040] Thoroughly mix absolute ethanol, glycerin or acetylacetone and ethyl orthosilicate, then use hydrochloric acid or nitric acid to adjust the pH value of distilled water to 2.5, and slowly add to the mixture, stir well and ultrasonically mix in ultrasonic for 18 minutes for later use.

[0041] Immerse the fiber-quartz ceramic matrix composite body in the above sol-reinforced slurry, vacuum impregnate (vacuum pressure is 0.009MPa), make the ...

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Abstract

The invention relates to a reinforcement method for a fibre-quartz ceramic-base composite material, and belongs to the technical field of inorganic materials. The composite material relates to a wave-transmitting material, and the finished product of the composite material is prepared by the following steps: carrying out sol reinforced infiltration treatment of a composite material body prepared through liquid-phase filtration-in situ solidifying molding; and finally, carrying out gel formation and solidification. The sol slurry comprises the following compositions by mol percentage: 10 to 50 percent of analytically pure anhydrous ethanol, 6 to 20 percent of analytically pure tetraethyl orthosilicate, 30 to 70 percent of distilled water and 6 to 20 percent of acetylacetone or glycerol. The reinforcement method has the advantages that the method not only can increase material density and improve material density uniformity, but also can reinforce the bonding force among SiO2 powder granules, remarkably improve the overall performance of the composite material, and meet the requirements of a high Mach number antenna housing on material performance.

Description

technical field [0001] The invention relates to a reinforcement method of a fiber-quartz ceramic matrix composite material, belongs to the technical field of inorganic materials, and is a wave-transmitting material. Background technique [0002] As early as the 1950s and 1960s, foreign countries began to study and apply fiber fabric composite materials, and they have been widely used in many aviation and aerospace engineering components such as nose cones, heat-resistant layers, antenna windows, and radomes. At present, the fibers that can be used in wave-transparent composite materials are mainly divided into quartz fibers, alumina fibers and boron nitride fibers, etc. The matrix of composite materials mainly includes inorganic and organic. Table 1 shows the performance parameters of several commonly used quartz fiber composite inorganic materials for radome. [0003] Table 1. Performance parameters of several quartz fiber composite inorganic materials for radome [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/622
Inventor 程之强王洪升李伶王重海韦其红陈达谦翟萍
Owner ZHONGCAI HIGH NEW MATERIAL
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