Method for improving tensile strength of carbon fibers

A technology of tensile strength and carbon fiber, applied in the field of carbon fiber preparation, can solve the problems of low tensile strength of carbon fiber, and achieve the effects of improving mechanical properties, tensile strength and simple method.

Inactive Publication Date: 2011-11-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the invention is to provide a method for improving the tensile strength of carbon fibers, which solves the technical problem of low carbon fiber tensile strength caused by existing processing methods

Method used

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  • Method for improving tensile strength of carbon fibers
  • Method for improving tensile strength of carbon fibers

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Embodiment

[0026] A brand of T300 carbon fiber that needs heat treatment is taken as the raw material, and its mechanical properties are 3.52GPa in tensile strength and 213GPa in tensile modulus. Through a heat treatment in the range of 1500-2000 °C, a section of carbon fiber was taken every 50 °C to measure its tensile strength, and it was found that the highest value of tensile strength appeared at 1900 °C, which was 3.81GPa; the domestic T300 carbon fiber was treated at 1900 °C The intermediate product was obtained, and then the raw material and the intermediate product were heat-treated under the same experimental conditions at 2400°C. Through mechanical performance tests, it was found that the tensile strength of the carbon fiber after one-step heat treatment and step-by-step heat treatment was 2.62GPa and 2.96GPa, respectively. The modulus is 341GPa and 347GPa, respectively. It can be seen that the tensile strength of carbon fiber with step heat treatment is 13% higher than that of ...

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Abstract

The invention relates to a method for improving the tensile strength of carbon fibers, which comprises the following steps: 1) determining a heat treatment temperature corresponding to the highest tensile strength of the carbon fibers; 2) placing carbon fibers needing heat treatment in a high temperature furnace to perform heat treatment at the heat treatment temperature, which corresponds to thehighest tensile strength and determined by the step 1), for 2 to 10 seconds to obtain a carbon fiber intermediate product; and 3) placing the carbon fiber intermediate product in the high-temperaturefurnace to perform heat treatment at 2,400 to 2,800 DEG C for 2 to 10 seconds. The invention solves the technical problem of low carbon fiber tensile strength of the conventional processing method. The method of the invention is simple and can greatly improve the tensile strength of the carbon fibers without using extra materials and equipment.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and in particular relates to a carbon fiber preparation method for reducing the skin-core structure of the carbon fiber through step-by-step heat treatment to improve the performance of the carbon fiber. Background technique [0002] Carbon fiber is a new type of non-metallic material developed to meet the needs of cutting-edge industries such as aerospace, aviation, and atomic energy. It has high tensile strength, high tensile modulus, low density, high temperature resistance, ablation resistance, and corrosion resistance. , high electrical and thermal conductivity, low thermal expansion, self-lubrication and good biocompatibility, etc., it is an ideal component of ablation-resistant, structural and functional composite materials, and has become an indispensable raw material for the development of various composite materials , the fourth-generation industrial element material th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12
Inventor 王浩静刘福杰范立东王红飞李福平程璐庞培东刘欢
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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