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Connection method for carbon/carbon composite materials

A carbon composite material and connection method technology, applied in the field of carbon/carbon composite material connection, can solve problems such as poor thermal shock resistance, and achieve the effects of excellent thermal shock resistance, enhanced interface bonding strength, and enhanced connection strength.

Inactive Publication Date: 2018-07-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for connecting carbon / carbon composite materials, which uses a homogeneous connection layer to connect carbon / carbon composite materials, specifically between the carbon / carbon composite material and itself In-situ synthesis of carbon nanotubes to reinforce the pyrolytic carbon connection layer solves the problem of poor thermal shock resistance caused by the mismatch between the thermal expansion coefficient of the heterogeneous connection layer and the carbon / carbon composite material. Repeated use in the environment provides avenues

Method used

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  • Connection method for carbon/carbon composite materials
  • Connection method for carbon/carbon composite materials
  • Connection method for carbon/carbon composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Cut the carbon / carbon composite material into 12×8×4mm 3 The rectangular parallelepiped sample was placed in a high-temperature muffle furnace at 1000°C for 8 minutes for pre-oxidation.

[0024] 2. Put the pre-oxidized carbon / carbon sample into a tube furnace, and use the chemical vapor deposition process to grow carbon nanotubes in situ. The growth process conditions are: xylene as the carbon source, ferrocene as the catalyst precursor, The concentration of ferrocene is 0.03g / ml, the growth temperature is 850°C, the flow rate of argon gas is 1000ml / min, the flow rate of hydrogen gas is 100ml / min, the injection rate is 0.2ml / min, and the carbon / carbon sample with carbon nanotubes grown on the surface is obtained by growing for 1h. Sample.

[0025] 3. Embed the carbon / carbon samples with carbon nanotubes grown on the surface and fix them with graphite fixtures, put them into a chemical vapor deposition furnace to deposit pyrolytic carbon for connection, heat the depo...

Embodiment 2

[0027] Using the same method as in Example 1, the growth time of the carbon nanotubes was adjusted to 0.5 h. The test results showed that the shear strength of the carbon / carbon sample connected by the carbon nanotubes / pyrolytic carbon intermediate layer reached 16.5 MPa.

Embodiment 3

[0029] 1. Cut the carbon / carbon composite material into 12×8×4mm 3 The rectangular parallelepiped sample was put into a high-temperature muffle furnace at 800°C for pre-oxidation for 5 minutes.

[0030] 2. Put the pre-oxidized carbon / carbon sample into a tube furnace, and use chemical vapor deposition to grow carbon nanotubes in situ. The growth process conditions are: ethanol as the carbon source, nickelocene as the catalyst precursor, and two The concentration of nickel is 0.01g / ml, the growth temperature is 900°C, the flow rate of argon gas is 300ml / min, the flow rate of hydrogen gas is 100ml / min, the injection rate is 0.5ml / min, and the carbon / carbon sample with carbon nanotubes grown on the surface is obtained by growing for 1h. .

[0031] 3. Embed carbon / carbon samples with carbon nanotubes grown on the surface together, fix them with graphite fixtures and place them in a chemical vapor deposition furnace to deposit pyrolytic carbon for connection. The deposition temper...

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Abstract

The invention provides a connection method for carbon / carbon composite materials. The method comprises the following steps: performing pre-oxidation treatment on surfaces of the carbon / carbon composite materials to form as many gullies as possible on the surfaces of the composite materials, wherein the gullies facilitate formation of a tortuous connection interface between a connecting layer and the carbon / carbon composite materials; growing carbon nanotubes in situ on the surfaces of the pre-oxidized carbon / carbon composite materials by adopting a chemical vapor deposition process; and enabling the carbon / carbon composite materials with the grown carbon nanotubes to be embedded together, performing fixing by using a graphite clamp, and depositing pyrolytic carbon among the carbon / carbon composite materials with the grown carbon nanotubes by adopting a chemical vapor infiltration process, so as to obtain a C / C composite material connected with a carbon nanotube / pyrolysis carbon middlelayer. The method provided by the invention has the main technical effects that compared with ceramic-based, glass-based and metal-based connecting layers, the carbon-based connecting layer prepared by the method provided by the invention has thermal expansion coefficient matched with that of the C / C composite material, and has the characteristics of excellent thermal shock resistance and high connection strength.

Description

technical field [0001] The invention relates to the technical field of connection methods of carbon / carbon composite materials, in particular to a connection method of carbon / carbon composite materials. Background technique [0002] Carbon / carbon composite material is a multiphase carbon material composed of carbon fiber reinforced carbon matrix. It has high specific strength, ablation resistance, high temperature resistance, chemical inertness, low thermal expansion coefficient and friction and wear resistance. It is used as a high temperature thermal structural material. It is widely used in high-tech fields such as aviation, aerospace and military. [0003] With the rapid development of engineering technology, it is necessary to combine simple shape carbon / carbon composite materials through connection technology to obtain components with large size or complex shape to meet special needs. The preparation cost of carbon / carbon composites is high, and the connection technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
CPCC04B37/00C04B2237/086C04B2237/54C04B2237/555
Inventor 冯雷杨艳玲何鑫侯小江锁国权
Owner SHAANXI UNIV OF SCI & TECH
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