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Preparation method of carbon fiber surface antioxidation coating

An anti-oxidation coating and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of uneven coating, exhaust gas polluting the air, high processing temperature, etc., and achieve simple process, easy raw materials, and curing temperature low effect

Inactive Publication Date: 2014-07-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods introduced in "Carbothermal Synthesis of Boron Nitride Coating on PAN Carbon Fiber" and "Preparation Method of Full Carbon Coating on Carbon Fiber Surface" need to acidify carbon fiber, which will reduce the mechanical properties of carbon fiber

Method used

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  • Preparation method of carbon fiber surface antioxidation coating
  • Preparation method of carbon fiber surface antioxidation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first step, using acetone as a solvent, the carbon fiber is processed by Soxhlet extraction method to remove the glue layer and other attachments on the surface of the carbon fiber bundle 6;

[0024] In the second step, take 1 part of silane coupling agent A151 as a precursor in parts by weight, join 98 parts of hydroalcoholic solutions composed of 75wt% ethanol and 25wt% distilled water to form a mixed solution, then add glacial acetic acid to make the mixed solution Adjust the pH value to 0.1-0.3, stir thoroughly for 60 minutes, then add 5 parts of silicon carbide powder as reinforcing particles, and stir thoroughly for 60 minutes to form a coating slurry;

[0025] In the third step, the coating slurry is injected into the dipping tank 4, and the carbon fiber bundle 6 after the degumming is arranged on the pay-off wheel 9 above the dipping tank 4, and then passes through the introduction wheel 8 and is arranged in the dipping tank 4 successively. The second pai...

Embodiment 2

[0028]The first step is to use ethanol as a solvent to treat the carbon fiber cloth through the Soxhlet extraction method to remove the adhesive layer and other attachments on the surface of the carbon fiber cloth;

[0029] In the second step, 2 parts of silane coupling agent K570 are taken as a precursor, and added to 100 parts of a hydroalcoholic solution composed of 95wt% ethanol and 5wt% distilled water to form a mixed solution, then adding glacial acetic acid to adjust the pH value of the mixed solution to 0.1-0.3, fully stirred for 80 minutes, then added 4 parts of boron nitride powder as reinforcing particles, fully stirred for 80 minutes to form a coating slurry;

[0030] The third step is to inject the coating slurry into the dipping tank, put the degummed carbon fiber cloth into the dipping tank, and then ultrasonically treat it for 30 minutes, so that the slurry is fully immersed in the carbon fiber cloth; take it out, and use a glass rod on the surface of the carbon...

Embodiment 3

[0033] In the first step, using chloroform as a solvent, the three-dimensional woven carbon fiber prefabricated body is treated by Soxhlet extraction method, and the glue layer and other attachments on the surface of the three-dimensional woven carbon fiber prefabricated body are removed;

[0034] In the second step, take 2 parts of silane coupling agent K550 as a precursor, add it to 95 parts of a hydroalcoholic solution composed of 95wt% isopropanol and 5wt% distilled water to form a mixed solution, stir thoroughly for 50 minutes, and then add 6 parts of silicon carbide The powder is used as reinforcing particles, and stirred for another 50 minutes to form a coating slurry;

[0035] The third step is to inject the coating slurry into the dipping tank, put the three-dimensional braided carbon fiber prefabricated body after degumming into the dipping tank, and then ultrasonically treat it for 30 minutes, so that the slurry is fully immersed in the three-dimensional braided carb...

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Abstract

The invention discloses a preparation method of a carbon fiber surface antioxidation coating, which belongs to the technical field of inorganic non-metallic material. The preparation method comprises the following steps: using an organic solvent to remove a glue layer and an attachment on the surface of the carbon fiber, taking a silane coupling agent as a precursor to prepare a coating slurry; coating the obtained coating slurry on the surface of the carbon fiber product and drying; in 99.999% of inert atmosphere, and processing the dried carbon fiber product under high temperature of 800-1600 DEG C for 30-360 minutes to obtain the carbon fiber surface antioxidation coating. According to the invention, the silane coupling agent is taken as a precursor, and is easily infiltrated with carbon fiber to form an uniform coating, the enhanced particles can improve the defects of poor clunging of the coating and cracking of the coating; the solidification time is short, the solidification temperature is low, and automation mechanical equipment is cooperated for easily realizing the continuous coating of the coating.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation coating on the surface of carbon fibers, in particular to a method for preparing an anti-oxidation coating on the surface of carbon fibers with simple process and low cost, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Carbon fiber reinforced ceramics or carbon fiber reinforced carbon matrix composites have the characteristics of high specific stiffness and specific strength, and have good high temperature performance. They can still maintain strength and other mechanical properties in an inert environment over 2000 ° C. They have good fracture toughness and Wear resistance, it is a very potential high-temperature structural material in industries such as military, energy and transportation. However, the oxidation resistance of carbon fiber is poor. In an oxidative atmosphere, carbon fiber will be oxidized above 400°C, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/77D06M11/74D06M11/80D06M15/643D06M101/40
Inventor 高希光宋迎东李龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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