红外, 2020, 41 (2): 37, 网络出版: 2021-01-27  

微波激光协同石墨化碳纤维的仿真模拟研究

The Simulation Study on the Cooperative Graphitization of Carbon Fibers via Microwave and Laser
作者单位
北京化工大学机电工程学院,北京100029
摘要
在碳纤维激光石墨化的过程中,丝束截面内存在较大的温差,导致碳纤维丝束毛丝现象严重。当激光超过一定功率时,甚至会出现断丝现象,严重影响碳纤维的连续激光石墨化。利用微波与激光对碳纤维进行协同石墨化,以减小石墨化过程中丝束的温差与热应力。针对微波加热的特殊性,设计出了一种可持续高效升温的加热腔;然后建立了电磁加热--激光加热--热辐射--流动传热--固体力学多物理场模型,并对其进行了仿真模拟。结果显示,微波的引入可以改善激光石墨化过程中丝束温度场的分布,并可有效减小丝束加热过程中的热应力。
Abstract
There is a large temperature difference in the tow cross-section during the graphitization of carbon fibers via laser, which leads to a serious fuzz phenomenon of carbon fiber tows. When the laser exceeds a certain power, the phenomenon of tow breaking may even occur, seriously affecting the continuous graphitization of the carbon fiber via laser. The use of microwaves and lasers to synergistically graphitize carbon fibers can reduce the temperature difference and thermal stress of the tow during graphitization. In view of the particularity of microwave heating, a heating cavity that can achieve continuous and efficient temperature rise is designed; then, a multiphysics model of electromagnetic heating--laser heating--thermal radiation--flow heat transfer--solid mechanics is established for simulation. The simulation results show that the introduction of microwaves can improve the distribution of the temperature field of the tow during laser graphitization and effectively reduce the thermal stress during tow heating.

张欢雷, 程礼盛, 张政和, 谭晶, 杨卫民, 安瑛. 微波激光协同石墨化碳纤维的仿真模拟研究[J]. 红外, 2020, 41(2): 37. ZHANG Huan-lei, CHENG Li-sheng, ZHANG Zheng-he, TAN Jing, YANG Wei-min, AN Ying. The Simulation Study on the Cooperative Graphitization of Carbon Fibers via Microwave and Laser[J]. INFRARED, 2020, 41(2): 37.

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