High-modulus graphite fiber and preparation method thereof

A technology of graphite fiber and manufacturing method, which is applied in the field of high modulus graphite fiber and its manufacturing, and can solve the problems of difficult quantitative production of large bundles of fibers, increasing the difficulty of the manufacturing process, and failure to achieve high modulus, etc.

Active Publication Date: 2014-01-29
UHT UNITECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disadvantages: This technology requires a long-term (>4 hours) pre-carbonization process in a traditional high-temperature furnace. Pre-carbonized fibers are formed before microwave carbonization, which increases the difficulty of the process. In addition, the precursor is low-carbon content. It is impossible to form high-strength and high-modulus materials by rapid carbonization
The patent US6372192B1 is for Oak ridge lab to

Method used

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  • High-modulus graphite fiber and preparation method thereof
  • High-modulus graphite fiber and preparation method thereof
  • High-modulus graphite fiber and preparation method thereof

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Experimental program
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Embodiment 1

[0061] Embodiment one uses the T700 carbon fiber of Japanese Toray Corporation of Japan Toray by microwave focused heating graphitization, and the power is 10KW, and the graphitization time is 1 minute; The time of graphitization is 1 minute; embodiment three is the M40 carbon fiber of Toray Corporation of Japan by microwave focused heating graphitization, and power is 20KW, and graphitization time is 1 minute; Embodiment 4 is the M40 carbon fiber of graphitized Japan Toray Corporation by microwave focused heating , the power is 30KW, and the graphitization time is 1 minute; Comparative Examples 1 to 6 are respectively T700 carbon fiber, T7800 carbon fiber, T1000 carbon fiber, M40 carbon fiber, M50 carbon fiber and M60 carbon fiber of Toray Corporation of Japan.

[0062] The test results of its mechanical properties (using the ASTM D4018-99 standard, taking the average value of the number of samples × 30) are shown in Table 2 below.

[0063]

Tensile strength / GPa ...

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PUM

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Abstract

The invention discloses a high-modulus graphite fiber with the tension-resistant modulus being 270-650GPa, and the high-modulus graphite fiber is in multiple crystallization structures, and the thicknesses (Lc) of the crystallization structures are 20-70 angstrom. The preparation method of the high-modulus graphite fiber comprises the following steps of carrying out ultra-fast high-temperature graphitization preparation on a carbon fiber as a raw material in a microwave focusing mode, increasing the temperature of the carbon fiber at a heating speed of 10-100 DEG C per minute to the graphitization temperature of 1400-3000 DEG C, and carrying out fast graphitization preparation within 0.5-10 minutes, so as form the graphite fiber with the high-modulus property.

Description

technical field [0001] The present invention relates to a high-modulus graphite fiber and its manufacturing method, aiming to provide a manufacturing method that can greatly improve the efficiency of graphitization and reduce the manufacturing process cost. Background technique [0002] Carbon fiber has a series of excellent characteristics such as low specific gravity, high tensile strength, high modulus, high electrical conductivity, high thermal conductivity, etc., and also has the advantages of flexible and weavable fibers. Among them, special carbon fibers with high strength and high modulus are widely used in new reinforced composite materials for construction, aviation and military. There are many types of carbon fiber raw materials, such as rayon, polyvinyl alcohol, vinylidene chloride, polyacrylonitrile (PAN), pitch, etc. The current mainstream carbon fiber uses polyacrylonitrile (PAN) as the raw material. The carbon fiber has excellent mechanical properties such a...

Claims

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Application Information

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IPC IPC(8): D01F9/12
Inventor 王智永
Owner UHT UNITECH
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