Preparation method of graphene fiber

A graphene fiber and fiber technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of difficult to control the morphology of graphene fibers, poor environmental friendliness, and many process steps, and achieve stable mechanical properties, convenient operation, simple craftsmanship

Active Publication Date: 2021-02-26
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of graphene fiber, and this invention has solved prior art in the preparation process of graphene fiber, and process step is many, needs experimental conditions such as strong acid and strong alkali, environmental friendliness is poor, introduces in the fiber There are many impurities and it is difficult to control the technical problems of graphene fiber morphology

Method used

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  • Preparation method of graphene fiber
  • Preparation method of graphene fiber

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Embodiment 1

[0044] Embodiment 1 Continuous graphene fiber 1 # preparation method

[0045] The third-generation continuous SiC fiber (in this embodiment, the third-generation continuous SiC fiber has a fiber diameter of 10.3 μm, a tensile strength of 1820 MPa, a modulus of 331 GPa, and a density of 2.95 g / cm 3 ) is placed in a graphite furnace, continuously evacuated to a vacuum degree of less than 30Pa, heated to 1800°C at a heating rate of 600°C / hour and then kept for 10 hours to obtain a continuous graphene fiber 1 # . The resulting continuous graphene fiber 1 # The tensile strength of the fiber is 375MPa, the modulus is 34GPa, and the density is 1.60g / cm 3 .

[0046] figure 1 It is the X-ray diffraction spectrum of the third-generation continuous SiC fiber used in the preferred embodiment 1 of the present invention, in which the peaks with diffraction angles of 35.6, 41.4, 60.0, 71.8 and 75.5 degrees correspond to the peaks of 3C-SiC grains respectively (111), (200), (220), (311)...

Embodiment 2

[0048] Embodiment 2 continuous graphene / silicon carbide composite fiber 1 # preparation method

[0049] The third-generation continuous SiC fiber (in this embodiment, the third-generation continuous SiC fiber has a fiber diameter of 10.3 μm, a tensile strength of 1820 MPa, a modulus of 331 GPa, and a density of 2.95 g / cm 3 ) placed in a graphite furnace, evacuated to a vacuum degree of less than 1Pa, heated to 1800°C at a heating rate of 300°C / hour and then kept for 1 hour to obtain a continuous graphene / silicon carbide composite fiber 1 # , the tensile strength of the fiber is 622MPa, the modulus is 195GPa, and the density is 2.49g / cm 3 .

[0050] Figure 7 It is a cross-sectional scanning electron micrograph of the continuous graphene / silicon carbide composite fiber prepared in preferred embodiment 2 of the present invention, Figure 8 It is a surface scanning electron micrograph of the continuous graphene / silicon carbide composite fiber prepared in preferred embodiment ...

Embodiment 3

[0051] Embodiment 3 continuous graphene fiber 2 # preparation method

[0052] The third-generation continuous SiC fiber (in this embodiment, the third-generation continuous SiC fiber has a fiber diameter of 10.3 μm, a tensile strength of 1820 MPa, a modulus of 331 GPa, and a density of 2.95 g / cm 3 ) is placed in a graphite furnace, evacuated to a vacuum degree of less than 1000Pa, heated to 1800°C at a heating rate of 400°C / hour and then kept for 8 hours to obtain a continuous graphene fiber 2 # . The tensile strength of the fiber is 473MPa, the modulus is 45GPa, and the density is 1.61g / cm 3 .

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Abstract

The invention provides a method for preparing graphene fibers, which comprises the following steps: in a vacuum environment and / or an inert gas environment, the SiC fiber is subjected to a temperature-raising step, and the temperature is raised to the decomposition and escape temperature of silicon element, and then kept warm to obtain the graphene fiber. The method uses SiC fibers as raw materials, and adopts a simple process to realize the continuous industrial preparation of graphene fibers.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene fibers. Background technique [0002] Graphene is a two-dimensional material with a two-dimensional hexagonal honeycomb structure composed of carbon atoms in sp2 hybrid orbitals. Because graphene has a series of excellent physical properties such as high strength, high thermal conductivity, and high electrical conductivity, it has great application prospects in the field of materials, so it has become an international research hotspot in recent years. However, graphene is insoluble in general solvents, and its dispersion is poor, making it difficult to process and use. In order to realize the large-scale application of graphene, the preparation and application research of graphene macroscopic materials have attracted much attention, including graphene fibers. Graphene fiber is a new type of fiber with integrated structure and function. It has br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12
CPCD01F9/12
Inventor 苟燕子王浩王军
Owner NAT UNIV OF DEFENSE TECH
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