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Method for preparing Si-C-O ceramic antioxidant coating on surface of carbon fiber

An anti-oxidation coating, carbon fiber technology, applied in the direction of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of pores, material performance degradation, cracks and other problems in the anti-oxidation coating, to meet the requirements of high temperature resistance, quantity reduction, reduction Effects of cracks and pores

Active Publication Date: 2020-02-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the existing technical problem that the anti-oxidation coating on the surface of carbon fiber prepared by the precursor dipping and cracking method has pores and cracks, resulting in a decrease in material performance, and provides a Si-C-O ceramic anti-oxidation coating on the surface of carbon fiber. Preparation

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  • Method for preparing Si-C-O ceramic antioxidant coating on surface of carbon fiber
  • Method for preparing Si-C-O ceramic antioxidant coating on surface of carbon fiber
  • Method for preparing Si-C-O ceramic antioxidant coating on surface of carbon fiber

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of the carbon fiber surface Si-C-O ceramic anti-oxidation coating of the present embodiment, carry out according to the following steps:

[0019] 1. Weigh 40% to 90% of propyltrimethoxysilane and 10% to 60% of phenyltrimethoxysilane by mass percentage and mix them uniformly to obtain mixed monomers;

[0020] 2. Potassium hydroxide is added to water to prepare a solution to obtain a potassium hydroxide solution, and the potassium hydroxide solution is heated to a temperature of 55°C to 75°C, and the mixed monomer is dropped into the potassium hydroxide solution under stirring conditions, After the dropwise addition, continue stirring for 4 to 6 hours at a temperature of 55°C to 75°C to ensure complete hydrolysis of the silane, then filter and dry the filter cake to obtain the precursor;

[0021] 3. Dissolving the precursor in xylene to obtain a precursor solution;

[0022] 4. Immerse polyacrylonitrile-based carbon fibers i...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of the potassium hydroxide solution in Step 2 is 0.025-0.1 mol / L; other aspects are the same as Embodiment 1.

specific Embodiment approach 3

[0026] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the water in step two is ultrapure water; other is the same as specific embodiment one or two.

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Abstract

The invention relates to a carbon fiber antioxidant coating preparation method, in particular to a method for preparing a Si-C-O ceramic antioxidant coating on a surface of a carbon fiber and aims tosolve the technical problem of material performance decline caused by pores and cracks in existing carbon fiber surface antioxidant coatings prepared according to a precursor impregnation cracking method. The method includes: adding mixed monomers of propyl trimethoxy silane and phenyl trimethoxy silane into potassium hydroxide aqueous solution, performing reaction, then filtering, and drying a filter cake to obtain a precursor; dissolving the precursor into xylene to obtain precursor solution; repeatedly impregnating polyacrylonitrile-based carbon fibers in the precursor solution, drying, then sintering in an argon atmosphere, and repeating impregnation, drying and sintering to obtain the antioxidant Si-C-O ceramic coating on the surface of the carbon fiber. By adoption of the method, theantioxidant Si-C-O ceramic coating on the surface of the carbon fiber is free of cracks and pores and can be applied to the field of high-temperature-resistant and antioxidant materials.

Description

technical field [0001] The invention relates to a preparation method of a carbon fiber anti-oxidation coating. Background technique [0002] With the rapid development of science and technology, the demand for new ultra-light, high temperature resistant, oxidation resistant and thermal shock resistant composite materials is becoming more and more urgent in industrial production. Carbon fiber materials have attracted extensive attention from researchers due to their light weight and high strength. They have been widely used as reinforcing materials in various fields of human activities, and have become a new high-tech industry in China. However, there are some lattice defects on the surface of carbon fibers and active points caused by defects caused by internal stress during the material preparation process. These active points will be oxidized when the temperature exceeds 400°C under air conditions, and the overall performance will be greatly reduced due to low oxidation res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/77D06M101/40
CPCD06M11/77D06M2101/40Y02E60/10
Inventor 张磊梁译方李季杨春晖
Owner HARBIN INST OF TECH