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Continuous carbon fibre graphitizing method and apparatus

A technology of graphitization and carbon fiber, which is applied in the fields of fiber chemical characteristics, chemical post-treatment of rayon, textiles and papermaking, etc. It can solve the problems affecting the stability of graphitized fibers, inconvenient operation and control, and uneven heating of fibers, so as to avoid The effects of poor heating stability, light weight, and simple equipment

Inactive Publication Date: 2006-03-15
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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Problems solved by technology

[0009] Comparing the reported devices for carbon fiber graphitization using plasma technology, it can be found that the thermal plasma graphitization device invented by Murai in Japan has high requirements for vacuum, and the entire graphitization process, including fiber feeding and receiving devices, is in the same In the vacuum chamber, this brings inconvenience to the operation and control; the DC arc plasma graphitization device uses the plasma arc to heat the fiber, but because the fiber passes through the arc horizontally, the fiber is heated unevenly, which affects the graphitized fiber. Stability; carbonization and graphitization of carbon fiber using microwave plasma technology and electromagnetic radiation, due to the use of intermittent graphitization, and in a vacuum, it is difficult to be used in industrial production

Method used

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  • Continuous carbon fibre graphitizing method and apparatus

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Effect test

Embodiment 1

[0024] Using 3K carbon fiber as raw material, the fiber stays in the acetone solution for 3 minutes, and after being dried at 200°C for 3 minutes, it enters the plasma graphitization device 6, the frequency of the high-frequency generator is 27MHz, and the draft ratio of the fiber is -1 %, the flow of argon plasma gas 2 is 2L / min, the flow of cooling gas 3 is 15L / min, the residence time of fiber in the plasma torch is 15 seconds, the output frequency of adjusting high-frequency generator 3 is 2KW, the sizing agent The concentration is 2%, the residence time is 20 seconds, and finally dried at 200° C. for 3 minutes to obtain graphite fibers. The properties are shown in Table 1.

Embodiment 2

[0026] Using 3K carbon fiber as raw material, the fiber stays in the acetone solution for 5 minutes, and after being dried at 300°C for 1 minute, it enters the plasma graphitization device 6, the frequency of the high-frequency generator is 27MHz, and the flow rate of the argon plasma gas 2 is 2L / min, the flow rate of cooling air 3 is 15L / min, the residence time of fiber in plasma torch is 15 seconds, the draft ratio of fiber is 1%, the output frequency of adjusting high-frequency generator 3 is 2.5KW, the sizing agent The concentration is 5%, the residence time is 20 seconds, and finally dried at 200° C. for 3 minutes to obtain graphite fibers. The properties are shown in Table 1.

Embodiment 3

[0028] Using 3K carbon fiber as raw material, the fiber stays in the acetone solution for 10 minutes, and after being dried at 300°C for 1 minute, it enters the plasma graphitization device 6. The frequency of the high-frequency generator is 27MHz, and the draft ratio of the fiber is 2%. , the flow rate of the argon plasma gas 2 is 2L / min, the flow rate of the cooling gas 3 is 15L / min, the residence time of the fiber in the plasma torch is 15 seconds, the output frequency of the high-frequency generator 3 is adjusted to be 3KW, and then the sizing is carried out. The concentration of the sizing agent is 2%, the residence time is 120 seconds, and finally dried at 300° C. for 1 minute to obtain graphite fibers.

[0029] The properties are shown in Table 1.

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Abstract

A method of graphitization for carbon fiber has been provided in the invention. The carbon fiber is heated to graphitization by the plasma heating technology in the 2000-3000 Deg C.. The temperature of the plasma torch is monitored by being controlled the output power and the volume of the carrier gas.

Description

technical field [0001] The invention belongs to a method and a device for continuous graphitization of carbon fibers, in particular to a process and a device for continuous graphitization of carbon fibers by using a plasma torch. technical background [0002] Carbon fiber and graphite fiber are mainly used as the most important reinforcement materials of advanced structural composite materials, and are widely used in spacecraft, aerospace vehicles, satellites, military industry and high-end sporting goods. [0003] Graphite fiber is made by graphitizing carbon fiber at 2000°C-3000°C under the protection of inert gas. The tensile modulus of carbon fiber can be greatly improved through graphitization. At present, the industrialized production of high-performance graphite fibers and the formation of series products are Japan and the United States. my country's graphite fiber is still in the development stage, and the level is far behind that of foreign countries. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12D01F11/16
Inventor 王浩静李东风朱星明晁兵周立功薛林兵刘颖王心葵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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