Method for preparing medium- and high-modulus large tow carbon fibers
AssigneesJiangsu Hengrui Aerospace Industry Co., Ltd., Jiangsu Hengrui Carbon Neutrality Technology Co., Ltd
InventorsChih-Yung Wang, Yongtao Gu, Xuan Li
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Abstract
A method for preparing medium- and high-modulus large tow carbon fibers includes performing in-phase microwave heating on low-modulus large tow carbon fibers, and regulating and controlling a surface current density of the carbon fibers in the range of 60-330 A/m to rapidly reach graphitization temperature of the carbon fibers, thereby completing a uniform and rapid graphitization process. The medium- and high-modulus large tow carbon fibers obtained by the preparation method of the present application can have a tensile modulus reaching 300-600 GPa, and a tensile strength maintained to be 3.5-5.0 GPa, and a dispersion of the tensile modulus of the carbon fibers is less than 1.5%.
Claims9
A method for preparing medium- and high-modulus large tow carbon fibers, comprising:
- performing microwave graphitization on low-modulus large tow carbon fibers, specifically performing in-phase microwave heating on the low-modulus large tow carbon fibers by a microwave graphitization furnace while regulating and controlling a surface current density of the low-modulus large tow carbon fibers in the microwave graphitization furnace, so that a current density on a surface of each carbon fiber in the furnace is uniformly controlled to be the same or nearly the same, the current density being in the range of 60-330 A/m, thereby rapidly and uniformly increasing the surface temperature of the large tow carbon fibers in the microwave graphitization furnace to 2000-3000° C., and completing a uniform graphitization process to obtain the medium- and high-modulus large tow carbon fibers.
Dependencies are inferred from the claim text.