US 12,215,441 B1
Method for preparing medium- and high-modulus large tow carbon fibers
Chih-Yung Wang, Suzhou (CN); Yongtao Gu, Suzhou (CN); and Xuan Li, Suzhou (CN)
Assigned to Jiangsu Hengrui Aerospace Industry Co., Ltd., Suzhou (CN); and Jiangsu Hengrui Carbon Neutrality Technology Co., Ltd, Suzhou (CN)
Filed by Jiangsu Hengrui Aerospace Industry Co., Ltd., Suzhou (CN)
Filed on Aug. 19, 2024, as Appl. No. 18/808,363.
Application 18/808,363 is a continuation of application No. PCT/CN2024/082169, filed on Mar. 18, 2024.
Claims priority of application No. 202311268510.2 (CN), filed on Sep. 28, 2023.
Int. Cl. D01F 9/12 (2006.01); D06M 10/00 (2006.01)
CPC D01F 9/12 (2013.01) [D06M 10/003 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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.