PAN基碳纤维高温处理氮脱除动力学研究

Kinetics Study of Denitrogen for PAN-based Carbon Fiber at Heat Treatment

利用元素分析研究了聚丙烯腈基碳纤维在1500℃和1900℃高温处理过程中纤维组成随时间的变化规律,随着处理时间的延长,纤维中C含量逐渐提高,N含量逐渐降低。动力学分析表明高温条件下碳纤维中N脱除符合一级反应特点,N脱除表观活化能Ea为272.2 kJ/mol,指前因子A0=6.99×10^(-9)。以此动力学参数建立的碳纤维中N高温脱除的动力学模型预测了碳纤维中N含量在1400~2400℃范围内随处理温度的变化规律,并以国产碳纤维进行了实验验证,发现所建立的动力学模型与实际具有很好的一致性。

The evolution of C and N content of PAN-based carbon fiber treated at 1500℃and 1900℃with treatment time was studied using elemental analysis.With increasing of treatment time,the C content in the fiber increased,while the N content decreased.Kinetic analysis indicated that the denitrogen reaction for carbon fiber during high temperature treatment was a grade 1 reaction with the apparent activation ener-gy of 272.2 kJ/mol and the pre-exponential factor of 6.99×10^(-9).The N content in carbon fibers treated at 1400~2400℃was predictedand verified using domestic carbon fibers,and found that the established kinetic model was in good accordance with the experimental results.