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Preparation method for alumina coat on quartz fibre surface

A technology of alumina coating and quartz fiber, which is applied in the field of functional ceramic materials, can solve the problems of fiber strengthening and toughening, reducing the mechanical properties of composite materials, and high interface bonding force, etc., so as to improve the interface bonding state and increase Mechanical properties, the effect of reducing the reaction

Active Publication Date: 2009-12-02
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quartz fiber reinforced silica matrix composites are mainly composed of quartz fiber reinforcement and SiO 2 matrix composition, where SiO 2 The matrix is ​​composed of silica sol conversion and added fused silica powder. It is a porous body with a random network structure of silicon-oxygen bonds. Therefore, there are more silicon hydroxyl groups on the surface of the quartz fiber and in the silica matrix. , the condensation reaction between the hydroxyl groups at the interface of the quartz fiber / silicon dioxide composite material causes the composite material to produce an excessively high interfacial bonding force. When the material is damaged, the surface of the composite material is brittle and fractures, and the strengthening and toughening effect of the fiber is not exerted. out, thereby reducing the mechanical properties of composite materials, which cannot meet the needs of practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of Al 2 o 3 Sol: Add 1800g deionized water into a three-mouthed flask, heat to 80°C, add 204gAl(OC 3 h 7 ) 3 , until one batch is completely hydrolyzed, then the next batch is added, until finally all are dissolved, continue to heat and stir for 0.5h, drop 50.06g of acetylacetone into the solution drop by drop, and keep stirring to make it chemically modified, continue Heat and stir for 1h, evaporate most of the alcohol, then add 2.91gHNO 3 Solution (HNO 3 The weight content is 65%) to adjust the pH value, and then reflux and stir at 80°C for 8h to obtain transparent and stable Al 2 o 3 Sol.

[0019] Coating: First, the organic wetting agent on the surface of the quartz fiber is removed by heat treatment, and then the quartz fiber is filled with Al 2 o 3 The sol is dipped in the dipping tank, the dipping time is controlled to 1.5h, and the auxiliary vacuum is 0.01MPa, so that the coating can penetrate into the fiber bundle evenly, and after dipping,...

Embodiment 2

[0021] Preparation of Al 2 o 3 Sol: Add 360g of deionized water into a three-mouthed flask, heat to 80°C, and dissolve 204g of Al(OC 3 h 7 ) 3 Dissolve in 600g C 3 h 7 o 3 , then added to deionized water in batches, until one batch was completely hydrolyzed, then the next batch was added, and finally all dissolved, continued heating and stirring for 0.5h, and added 65.08g of ethyl acetoacetate dropwise into the solution , and keep stirring to make it chemical, continue to heat and stir for 1h, evaporate most of the alcohol, then add 6.78gHNO 3 Solution (HNO 3 The weight content is 66%) to adjust the pH value, and then reflux and stir at 80°C for 8h to obtain transparent and stable Al 2 o 3 Sol.

[0022] Coating: First, the organic wetting agent on the surface of the quartz fiber is removed by heat treatment, and then the quartz fiber is filled with Al 2 o 3 The sol is dipped in the dipping tank, the dipping time is controlled to 2h, and the auxiliary vacuum is 0.01...

Embodiment 3

[0024] Preparation of Al 2 o 3 Sol: Add 1800g deionized water in a three-mouth flask, add Al(NO 3 ) 3 .9H 2 O 375g, until one batch is completely hydrolyzed, then add the next batch, until finally all dissolved, add dropwise to pH=9.2 with ammonia water to generate a precipitate, the precipitate is directly rinsed with deionized water without aging, and removed by suction NO 3 - , redisperse the precipitate with water, and add 9.69gHNO 3 Solution (HNO 3 The weight content is 68%) to adjust the pH value, and then reflux and stir at 80°C for 16h to obtain transparent and stable Al 2 o 3 Sol.

[0025] Coating: First, the organic wetting agent on the surface of the quartz fiber is removed by heat treatment, and then the quartz fiber is filled with Al 2 o 3 The sol is dipped in the dipping tank, and the dipping time is controlled to 3 hours, and the ultrasonic vibration treatment is assisted to make the coating penetrate into the fiber bundle evenly. After dipping, it is...

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Abstract

The invention relates to a preparation method for an alumina coat on quartz fibre surfaces, and belongs to the technical field of special functional ceramics. The preparation method comprises the following steps: respectively adding aluminum ion, nitric acid and chelating agent in solvent according to the molar ratio of 1: (0.03-0.28): (0.5-1) till all the materials are hydrolyzed to generate sediments; then, adding peptizator to carry out peptization; carrying out reflux heating and stirring for 8 to 24h at a temperature of between 50 and 100 DEG C to obtain transparent and stable Al2O3 sol; putting quartz fibre into a steeping vat of Al2O3 sol for steeping and then heating up and gradually drying the quartz fibre at a temperature of between room temperature and 80 DEG C; and finally, carrying out heat treatment at a temperature of between 450 and 850 DEG C to obtain the quartz fibre coated with the alumina coat. The preparation method is scientific, reasonable and easy to implement; moreover, the Al2O3 coat coated on the surface of the quartz fibre increases material mechanical property and reduces material brittle fracture.

Description

technical field [0001] This description relates to a method for preparing an alumina coating on the surface of quartz fibers, and belongs to the technical field of special functional ceramic materials. Background technique [0002] Aerospace wave-transparent material is a multifunctional dielectric material that protects the normal operation of communication telemetry, guidance, detonation and other systems of aircraft under harsh environmental conditions. It has been widely used in various aircraft radio systems. As the flight Mach number of the aircraft continues to increase, the temperature and thermal shock of the radome at the highest and highest position of the aircraft's aerodynamic force and aerodynamic heat are getting higher and higher. Therefore, high-temperature wave-transparent materials have become the focus of research. High-temperature wave-transparent materials should generally meet the following requirements: excellent electrical properties, small dielectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C25/42C03C25/16
Inventor 王重海韦其红李伶程之强王洪升陈达谦翟萍于宏林
Owner ZHONGCAI HIGH NEW MATERIAL
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