Carbon fiber surface silica dioxide coating preparation method

A silica and carbon fiber technology, applied in fiber processing, plant fibers, textiles and papermaking, etc., can solve the problems of complex equipment, carbon fiber surface damage, high control process requirements, and achieve a smooth and smooth coating.

Inactive Publication Date: 2007-07-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching the literature of the prior art, it was found that Dong Xingguang et al published "High Temperature Oxidation of Carbon Fiber Coated by Radio Frequency Method" in "Fiber Composite Materials" (2005, 03, 28-31 pages), in which it was proposed to use radio frequency method to prepare The anti-oxidation coating on the surface of carbon fiber, the specific method is: heating the carbon fiber by radio frequency at 700-800°C for chemical vapor deposition. mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1: Get 208g of tetraethyl orthosilicate, 36g of water, 244g of isopropanol, 10g of glycerin, add hydrochloric acid to make the solution pH=3, after stirring for 2 hours, add 36g of PVA (polyvinyl alcohol) aqueous solution with a mass fraction of 5% , and continue stirring for 1 hour. After the stirring is completed, filter with filter paper to obtain a silicon dioxide precursor solution. The carbon fiber is produced by Jilin Carbon Plant, with a diameter of 6-8μm, and each bundle of carbon fiber has 1000 monofilaments.

[0017] The carbon fiber bundles were soaked in acetone for 2 minutes, rinsed with deionized water and dried, then impregnated with the above-mentioned silica precursor solution for 10 minutes, and the impregnation process was 40 kHz ultrasonic vibration. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 200°C at a rate of 4°C per minute, then keep the temperature for 30 minutes, then rais...

example 2

[0018] Example 2: Carbon fiber is the same as Example 1.

[0019] Take 208 g of tetraethyl orthosilicate, 27 g of water, 460 g of ethanol, and 15 g of glycerol, add hydrochloric acid to make the solution pH=2, stir for 2 hours, add 27 g of 5% PVA (polyvinyl alcohol) aqueous solution, and continue stirring for 1 hour . After the stirring is completed, filter with filter paper to obtain a silicon dioxide precursor solution.

[0020] After the carbon fiber bundle was soaked in acetone for 2 minutes, rinsed with deionized water and dried, it was impregnated with the above silica precursor solution for 60 minutes. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 180°C at a rate of 4°C per minute, then keep the temperature for 30 minutes, then raise the temperature to 500°C at a rate of 4°C per minute, keep the temperature for 60 minutes, and then cool it naturally. carried out under the protection of argon. The obtained c...

example 3

[0021] Example 3: The silicon dioxide precursor solution is the same as Example 2. Carbon fiber is the same as example 1.

[0022] The carbon fiber bundle is degummed by high-temperature burning, rinsed with deionized water and dried, soaked in 10% (volume concentration) nitric acid for 20 minutes for surface oxidation etching, and impregnated with the above-mentioned silica precursor solution for 30 minutes. The process uses 40kHz ultrasonic vibration. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 150°C at a rate of 4°C per minute, then keep the temperature for 60 minutes, then raise the temperature to 450°C at a rate of 4°C per minute, keep the temperature for 60 minutes, and then cool it naturally. carried out under the protection of argon. The obtained carbon fiber with silica coating has a flat and smooth coating on the surface of the monofilament, and its thickness is about 0.3 μm. The thermal oxidation temp...

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Abstract

The invention relates to a method for preparing silicon dioxide coating on the surface of carbon fiber, belonging to the material technological area. In the invention alcohols is adopted as the solvent. Ethyl orthosilicate generates hydrolysis reaction under the acidic condition to form silicon dioxide precursor solution. The silicon precursor solution dips the pre-treating carbon fiber. It is volatilized by increasing the temperature slowly and then is sintered to generate polycondensation. Silicon dioxide coating is formed on the single-silk surface of carbon fiber and the thickness of coating is less than 1 mum. The coating is smooth and not easy to break off. The carbon fiber maintains the softness and stitchability of original carbon fiber on the one hand. At the same time the oxidative resistance is improved and the infiltrating of compound material with the base in preparing is improved.

Description

technical field [0001] The invention relates to a preparation method of a carbon fiber surface coating in the field of material technology, in particular to a preparation method of a carbon fiber surface silica coating. Background technique [0002] Carbon fiber is a commonly used reinforcing material for composite materials. It has the advantages of high specific strength, high specific modulus, low density, easy weaving and processing, and good thermal and electrical properties. It is used in metal matrix and polymer matrix composite materials. Get a wide range of applications. However, the oxidation resistance of carbon fiber is poor, and there is obvious weight loss and strength reduction in the air above 400 °C. Moreover, the wettability between carbon fiber and some matrix is ​​not good, so it is difficult to form a composite material with compactness and excellent performance. Therefore, it hinders the application of carbon fiber in aerospace and other fields that r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M101/04
Inventor 赵慧锋王浩伟夏存娟马乃恒李险峰
Owner SHANGHAI JIAO TONG UNIV
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