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High modulus graphite fiber and its manufacturing method

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

Active Publication Date: 2016-01-20
UHT UNITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
Patent US6372192B1 is for Oakridgelab to use microwave plasma to carbonize polyacrylonitrile fiber (PAN), which is characterized in that the PAN fiber pre-oxidized at 500 ° C is excited by microwaves in a vacuum and low pressure environment, and the plasma is used in an oxygen-free environment For carbonization of pre-oxidized PAN fibers, the microwave energy is mainly used to generate gas plasma, the main heating area is the fiber surface, and the heat capacity is difficult to quantify the production of large bundles of fibers. At the same time, the highest strength is only 2.3GPa, and the modulus is only 192GPa. High Modulus Specifications

Method used

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  • High modulus graphite fiber and its manufacturing method
  • High modulus graphite fiber and its manufacturing method
  • High modulus graphite fiber and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Using microwave focus to heat graphitize Toray’s T700 carbon fiber with a power of 10KW and graphitization time of 1 minute; Example 2: Using microwave focus to heat graphitize Toray’s T700 carbon fiber with a power of 20KW, graphite The heating time is 1 minute; the third embodiment uses microwave focusing to heat graphitize the M40 carbon fiber of Toray Japan, the power is 20KW, and the graphitization time is 1 minute; the fourth embodiment uses the microwave focus heating to graphitize the M40 carbon fiber of Toray Japan , The power is 30KW, the graphitization time is 1 minute; the comparative examples one to six are T700 carbon fiber, T7800 carbon fiber, T1000 carbon fiber, M40 carbon fiber, M50 carbon fiber and M60 carbon fiber of Toray.

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

[0063]

Tensile strength / GPa

Tensile modulus / GPa

Lc / Angstrom

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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 a manufacturing method thereof, and aims to provide a manufacturing method that can greatly increase 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 fiber flexibility and woven characteristics. Among them, special carbon fiber with high strength and high modulus is widely used in new reinforced composite materials in 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 existing mainstream carbon fiber uses polyacrylonitrile (PAN) as the raw material. The carbon fiber has excellent mechanical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12
Inventor 王智永
Owner UHT UNITECH
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