Preparation method of bent nano carbon fiber reinforced C/C composite material

A nano-carbon fiber and composite material technology, which is applied in the field of preparation of curved nano-carbon fiber reinforced C/C composite materials, can solve the problems of carbon fiber material damage, difficult industrial promotion, and complicated process, so as to avoid deactivation and process Simple, less damaging effect

Inactive Publication Date: 2021-03-12
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the method of introducing CNTs / CNFs by the in-situ growth method uses transition metals Fe, Co, Ni or their alloys as catalysts, and the synthesis process temperature is about 650-800°C, which requires high energy consumption and difficult industrial promotion; and due to Its temperature is high, and it is easy to cause damage to the carbon fiber material; and when this type of catalyst synthesizes curved nano-carbon fibers, the carbon source gas is usually passed through a solution containing S or P such as thiophene (a growth aid for curved nano-carbon fibers), The process is more complicated

Method used

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  • Preparation method of bent nano carbon fiber reinforced C/C composite material
  • Preparation method of bent nano carbon fiber reinforced C/C composite material
  • Preparation method of bent nano carbon fiber reinforced C/C composite material

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preparation example Construction

[0037] A preparation method of curved nano-carbon fiber reinforced C / C composite material, comprising the steps of:

[0038] Step S1, ultrasonically impregnating the carbon felt in a copper tartrate solution for a period of time, taking it out and drying it, wherein the concentration of the copper tartrate solution is 0.01-0.015mol / mL, and the ultrasonic impregnation time is 10-20min;

[0039] Step S2, using acetylene as the carbon source and nitrogen as the protective gas, controlling the flow rate of acetylene to 0.2-0.5L / min, and performing catalytic chemical vapor deposition at 270-290°C and working pressure of 50-80kPa, and the original growing curved nanofibers in place to obtain a carbon felt containing curved nanofibers;

[0040] Among them, in the catalytic chemical vapor deposition, the heating rate is controlled to be <3°C / min, and the catalytic chemical vapor deposition time is 30-60 minutes;

[0041] Step S3, using nitrogen as a protective gas, carbonizing the carb...

Embodiment 1

[0048] First, ultrasonically impregnate the carbon felt in 0.01mol / mL copper tartrate solution for 10min, take it out and place it in an oven at 90°C for 12h for drying; Under the condition of (acetylene)=0.3L / min, the carbon felt after impregnating copper tartrate is carried out catalytic chemical vapor deposition 30min, in situ growth curved nanofiber on carbon fiber surface, obtains the carbon felt that contains curved nanofiber; Then with Nitrogen is used as a protective gas, and the carbon felt is carbonized at 950°C to obtain a carbon felt with a mass fraction of curved nano-carbon fibers of 21.55%, wherein the diameter of the curved nano-carbon fibers is about 30-220nm, and the length is about 2-2. 15 μm; Finally, propylene is used as the carbon source, and argon is used as the carrier gas to conduct chemical vapor deposition by self-induction heating under the conditions of 950°C, 7kPa, Q (propylene) = 1.5L / min, Q (argon) = 1.5L / min The carbon felt containing curved ca...

Embodiment 2

[0051] Firstly, ultrasonically impregnate the carbon felt in 0.015mol / mL copper tartrate solution for 10min, take it out and place it in an oven at 90°C for 12h for drying; Under the condition of (acetylene)=0.3L / min, the carbon felt after impregnating copper tartrate is carried out catalytic chemical vapor deposition 60min, grows curved nanofiber in situ on the carbon fiber surface, obtains the carbon felt that contains curved nanofiber; Then with Nitrogen is used as a protective gas, and it is carbonized at 950°C to obtain a carbon felt with a mass fraction of curved nano-carbon fibers of 64.06%, wherein the diameter of the curved nano-carbon fibers is about 20-160 nm, and the length is about 10-25 μm ; Finally, with propylene as the carbon source and argon as the carrier gas, pass through the self-induction heating chemical vapor deposition furnace under the conditions of 950 ° C, 7kPa, Q (propylene) = 1.5L / min, Q (argon) = 1.5L / min The carbon felt containing curved nano-ca...

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Abstract

The invention discloses a preparation method of a bent nano carbon fiber reinforced C / C composite material. The preparation method comprises the following steps: ultrasonically impregnating a carbon felt in a copper tartrate solution for a period of time; taking acetylene as a carbon source and nitrogen as a protective gas, controlling the acetylene flow to be 0.2-0.5 L / min, and carrying out catalytic chemical vapor deposition under the conditions that the temperature is 270-290 DEG C and the working air pressure is 50-80kPa, so as to obtain a carbon felt containing bent nanofibers; carbonizing the carbon felt at the temperature of 950-1050 DEG C by taking nitrogen as a protective gas to obtain carbon felt containing bent nano carbon fibers; taking propylene as a carbon source and argon asa carrier gas, and carrying out CVI densification on the carbon felt containing the bent nano carbon fibers to obtain the bent nano carbon fiber reinforced C / C composite material. The preparation method of the bent nano-carbon fiber reinforced C / C composite material is simple in process and low in energy consumption, the nano-carbon fibers growing in situ are well combined with the carbon fibersin the carbon felt, the nano-carbon fibers are bent, and the reinforcing effect on the C / C composite material is good.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of curved nano-carbon fiber reinforced C / C composite material. Background technique [0002] C / C composite material refers to a pure carbon multiphase structure composed of carbon fiber or its fabric as the reinforcing phase, and chemical vapor infiltration pyrolytic carbon or liquid phase impregnated-carbonized resin carbon and pitch carbon as the matrix. C / C composites not only have low density and coefficient of thermal expansion, high strength, modulus and fracture toughness, but also have excellent wear resistance, ablation resistance, thermal conductivity and thermal shock resistance, therefore, its It is often used as an ultra-high temperature structural material in the aerospace field, such as: aircraft brake discs, wing leading edges, rocket nozzles, diffusion sections, missile end caps and other components. [0003] In the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/52C04B35/622C04B35/83
Inventor 苏哲安肖黎军王亚峰黄启忠
Owner CENT SOUTH UNIV
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