新型炭材料（中英文）2025，Vol.40Issue(6)：1347-1361,15.DOI:10.1016/S1872-5805(25)60998-X
用熔纺方程对中间相沥青的纺丝工艺及纤维结构进行优化
Optimizing mesophase pitch spinning using melt spinning process equations and the fiber structure produced
摘要
Abstract
Mesophase pitch carbon fibers have an ultra-high modulus and thermal conductivity that are unmatched by other carbon fibers,making it irreplaceable in many fields.However,due to the high temperature dependence of the viscosity of the melted pitch and the poor mechanical properties of pitch fibers,it is difficult to reduce the fiber diameter when using con-tinuous spinning.We used the Mathworks Matlab software to optimize the meso-phase pitch melt spinning model and to simulate the effects of spinning temperat-ure,mass flow rate,winder speed,and quenching air temperature near the spin-neret on the maximum shear rate during drawing.Simulation results demonstrate that applying gradient cooling to the melt upon exiting the spinneret significantly re-duces the maximum shear rate and extends the drawing zone,thereby promoting the spinning stability and helping reduce the fiber diameter.In the experiment,instead of quenching in air,we applied gradient cooling to the melt,whose temperature de-creased according to the equation Ta=298+278exp(-11.4z),where Ta is the final air temperature in Kelvin,and z is the distance from the spinneret in meters.It was found the gradient cooling greatly improved the draw-down ratio,reducing the average dia-meter of the pitch fibers from 20.8 to 13.1 μm,along with improved process stability.The experimental results are in excellent agreement with the predictions.At the same time,the tensile strength of the 1150℃ carbonized fibers increased from 0.6 to 1.1 GPa.Although the degree of orientation of the fibers decreased slightly,the tight bonding between microcrystals,the sup-pression of splitting,and the smaller diameter improved the mechanical properties of carbon fibers.This study provides an ef-fective method for reducing the fiber diameter while improving continuity.关键词
中间相沥青/熔融纺丝方程/可纺性/碳纤维/结构Key words
Mesophase pitch/Melt spinning equations/Spinnability/Carbon fiber/Structure分类
化学化工引用本文复制引用
SUN Xiang,GONG Rui-fu,LU Yong-gen..用熔纺方程对中间相沥青的纺丝工艺及纤维结构进行优化[J].新型炭材料（中英文）,2025,40(6):1347-1361,15.基金项目
This work was supported by the National Natur-al Science Foundation of China(52172039). 国家自然科学基金资助项目(52172039). （52172039）
