Preparation method of graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite

A silicon carbide ceramic base and graphene modification technology, applied in the field of surface modification treatment, can solve the problems of poor mechanical properties of carbon fibers and silicon carbide ceramics, and achieve the effects of improving mechanical properties, increasing the bonding interface, and ensuring effective transmission.

Active Publication Date: 2019-08-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a preparation method of graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material, which can graft a layer of uniform graphene oxide on the surface of carbon fiber , to solve the problem of poor mechanical properties of carbon fiber and silicon carbide ceramics in carbon fiber reinforced silicon carbide ceramic matrix composites

Method used

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  • Preparation method of graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite
  • Preparation method of graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite
  • Preparation method of graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite

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Embodiment 1

[0035] In this embodiment, the preparation method of a graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material is as follows:

[0036] (1) Completely immerse the carbon fiber in acetone, heat it to reflux for 15 hours, take it out, and dry it at 60°C for 12 hours to obtain the dried carbon fiber. The dried carbon fiber is completely immersed in concentrated nitric acid and immersed at 60°C for 1.5 hours. After taking it out of concentrated nitric acid, wash the carbon fiber with deionized water to neutrality, and dry it at 60°C for 12 hours to obtain the carbon fiber with surface oxidation treatment;

[0037] (2) Disperse 50 mg of graphene oxide into 10 mL of ethanol, and add 2 mL of 5% silane coupling agent γ-aminopropyltriethoxysilane ethanol solution to obtain a silane coupling agent modified graphene oxide ethanol solution; Step (1) The prepared surface oxidation-treated carbon fiber is immersed in a silane coupling agent-modified graph...

Embodiment 2

[0051] In this embodiment, a method for preparing a graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material, step (2) disperse 30 mg of graphene oxide in 10 mL of ethanol, and other things are the same as in embodiment 1.

[0052] The graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material prepared after the above operations is as Figure 4 As shown, it can be seen that almost all the cracks on the surface of the composite material are deflected. This is because the graphene oxide is reduced to graphene during the high temperature process to form an interface layer, which protects the internal carbon fibers from being easily physically and chemically affected. Damage, forming a weak interface bond, and can cause the cracks transmitted from the matrix to the carbon fiber to deflect at the interface layer.

Embodiment 3

[0054] In this embodiment, a method for preparing a graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material, step (2) disperse 60 mg of graphene oxide in 10 mL of ethanol, and other things are the same as in embodiment 1.

[0055] The graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material prepared after the above operations is as follows Figure 5 As shown, it can be seen that as the concentration of graphene oxide increases, there are fewer cracks on the surface of the composite material, and a small amount of cracks are deflected, making the bond between the carbon fiber and the silicon carbide matrix dense.

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Abstract

The invention discloses a preparation method of a graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite. According to the method, oxidation treatment is performed onthe surface of carbon fiber, the surface of the carbon fiber is grafted with graphene oxide with a silane coupling agent grafting method, finally, carbon fiber with the surface modified with grapheneoxide is infiltrated into a polycarbosilane precursor solution with a precursor infiltration and pyrolysis method, then, curing and pyrolysis are performed, and the carbon fiber reinforced silicon carbide ceramic matrix composite is formed. In the preparation method, graphene oxide on the surface of the carbon fiber can protect the carbon fiber against physical and chemical damage and obviouslyimprove wetting property with the precursor solution and significantly increases the bonding interface between carbon fiber and a silicon carbide ceramic matrix, the interface bonding force between acarbon fiber reinforcement and the ceramic matrix is increased, and effective transfer of load between the ceramic matrix and the fiber reinforcement is guaranteed.

Description

Technical field [0001] The invention relates to the technical field of surface modification treatment, in particular to a method for preparing a graphene oxide modified carbon fiber reinforced silicon carbide ceramic matrix composite material. Background technique [0002] People pay more and more attention to advanced ceramic materials because of their high strength, high temperature resistance, chemical resistance, and light specific gravity. However, their brittleness limits the application of these materials in many high-end fields. In order to solve the shortcoming of the greater brittleness of ceramic materials, the use of carbon fiber as a reinforcement to make a ceramic matrix composite material can combine the advantages of carbon fiber and silicon carbide to the greatest extent, and carbon fiber plays a role of high strength, high modulus, and high stability. , Making this type of composite materials have the potential to play a greater role in the military and aerospac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/628C04B35/80
CPCC04B35/806C04B35/571C04B35/62873C04B2235/5248
Inventor 张永刚文章苹钱鑫王雪飞李德宏宋书林王欣宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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