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Carbon fiber surface C/Si composite coating and preparation method thereof

A composite coating and carbon fiber technology, applied in the field of multifunctional C/Si composite coating and its preparation, can solve the problems of reducing carbon fiber strength, large carbon fiber damage, uneven coating, etc., so as to improve oxidation resistance and reduce damage , the effect of improving wettability

Active Publication Date: 2012-06-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the coatings prepared above still have certain deficiencies. The coatings prepared by the chemical vapor deposition method under normal pressure are relatively uneven. Although the C-Si gradient coating can improve the wetting of the fiber and the substrate to a certain extent properties, but the composition is not easy to control, and the results show that the improvement of the anti-oxidation effect on fibers is not obvious; although the Sol-Gel method is simple, the thickness and uniformity of the coating are not easy to control, and it is difficult to control the coating thickness and uniformity in the preparation of SiO 2 A series of treatments need to be carried out on the surface of the carbon fiber before, which will greatly damage the carbon fiber and greatly reduce the strength of the carbon fiber

Method used

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  • Carbon fiber surface C/Si composite coating and preparation method thereof
  • Carbon fiber surface C/Si composite coating and preparation method thereof
  • Carbon fiber surface C/Si composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 : Place the carbon fiber sample in absolute ethanol, clean it with an ultrasonic cleaner for 15 minutes, then take it out, and dry it at 60°C for later use;

[0023] Put the processed carbon fiber sample in the LPCVD furnace, evacuate to -0.096MPa, close the vacuum valve, time 6min, the index of the vacuum gauge remains unchanged, the furnace is well sealed, and start the follow-up test;

[0024] Pass 0.2L / h of protective gas Ar, open the vacuum valve, maintain a negative pressure of -0.096MPa, and the temperature in the LPCVD furnace rises to 1050°C within 3 hours;

[0025] When the temperature rises to 1050°C, start to pass CH 4 , the flow rate is controlled at 20L / h, and the deposition time is 3h. After the preparation of the inner coating pyrolytic carbon is completed, the flow of CH is stopped. 4 ;

[0026] Adjust the temperature of the furnace chamber, the temperature is set to 950 °C, and at the same time, H is introduced into the furnace chamber ...

Embodiment 2

[0029] Example 2 : Place the carbon fiber sample in absolute ethanol, clean it with an ultrasonic cleaner for 20 minutes, then take it out, and dry it at a low temperature at 80°C for later use;

[0030] Put the processed carbon fiber sample in the LPCVD furnace, evacuate to -0.094MPa, close the vacuum valve, and time it for 8 minutes. The index of the vacuum gauge remains unchanged, the furnace is well sealed, and the follow-up test is started;

[0031] Pass 0.3L / h of protective gas Ar, open the vacuum valve, maintain a negative pressure of -0.094MPa, and the temperature in the LPCVD furnace rises to 1100°C within 3 hours;

[0032] When the temperature rises to 1100°C, start to pass CH 4 , the flow rate is controlled at 24L / h, and the deposition time is 4h. After the preparation of the inner coating pyrolytic carbon is completed, stop the flow of CH 4 ;

[0033] Adjust the temperature of the furnace chamber, set the temperature to 1050 ° C, and at the same time pass H in...

Embodiment 3

[0036] Example 3: Place the carbon fiber sample in absolute ethanol, clean it with an ultrasonic cleaner for 25 minutes, then take it out, and dry it at 100°C for later use;

[0037] Put the processed carbon fiber sample in the LPCVD furnace, evacuate to -0.092MPa, close the vacuum valve, and time it for 10 minutes. The index of the vacuum gauge remains unchanged, the furnace is well sealed, and the follow-up test is started;

[0038] Pass 0.4L / h of protective gas Ar, open the vacuum valve, maintain a negative pressure of -0.092MPa, and the temperature in the LPCVD furnace rises to 1120°C within 3 hours;

[0039] When the temperature rises to 1120°C, start to pass CH 4 , the flow rate is controlled at 32L / h, and the deposition time is 5h. After the preparation of the inner coating pyrolytic carbon is completed, the flow of CH is stopped. 4 ;

[0040] Adjust the temperature of the furnace chamber, the temperature is set to 950 °C, and at the same time, H is introduced into...

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Abstract

The invention discloses a carbon fiber surface C / Si (carbon / silicon) composite coating and a preparation method thereof. The carbon fiber surface C / Si composite coating is prepared by using SiCl4 and CH4 as raw materials, using Ar as protective gas and carrier gas, using H2 as reduction gas and using a negative pressure chemical vaporous deposition method. The prepared pyrolytic carbon coating has thickness of about 0.3 to 1mum. The prepared Si-system outer coating has thickness of about 0.5 to 1.2mum. The prepared coating is uniform, compact and flat and has excellent combination among layers. According to the invention, on one hand, the oxidation resistance of carbon fibers is improved and the high-strength performance of the carbon fibers is protected, and on the other hand, the wettabilities of the carbon fibers and a metal matrix are improved and the success rate of preparation of the composite material is greatly improved.

Description

technical field [0001] The invention relates to a carbon fiber surface coating in the field of material technology and a preparation method thereof, in particular to a multifunctional C / Si composite coating and a preparation method thereof. Background technique [0002] The original untreated carbon fiber has a smooth surface, high inertness, low surface energy, lack of chemically active functional groups, low reactivity, poor adhesion to the matrix, harmful chemical reactions with metals, and interfacial infiltration with metals. Poor, poor high-temperature oxidation resistance and other shortcomings, which directly affect the mechanical properties of composite materials, limit the high performance of carbon fiber, and also hinder the application of carbon fiber in aerospace and other fields that require lightweight, high-strength, and high-modulus materials. Preparing a protective coating on the surface of carbon fibers can effectively solve the above problems. The existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/04C22C49/14C22C101/10C22C121/02
Inventor 付业伟童永煌齐乐华何子博程三旭李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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