激光石墨化过程中激光功率和牵伸力对聚丙烯腈基碳纤维化学结构和微观结构的影响

doi:10.16085/j.issn.1000-6613.2017-0952

化工进展 ›› 2018, Vol. 37 ›› Issue (02): 658-663.DOI: 10.16085/j.issn.1000-6613.2017-0952

激光石墨化过程中激光功率和牵伸力对聚丙烯腈基碳纤维化学结构和微观结构的影响

黎三洋¹, 张有忱¹, 沙扬², 姚良博¹, 谭晶¹, 李好义¹, 曹维宇², 杨卫民¹

1 北京化工大学机电工程学院, 北京 100029;
2 北京化工大学材料科学与工程学院, 北京 100029

收稿日期:2017-05-22 修回日期:2017-09-12 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: 杨卫民,教授,博士生导师。
作者简介:黎三洋(1991-),男,硕士研究生,研究方向为碳纤维高温激光石墨化工艺及高性能碳纤维制备。
基金资助:
国家自然科学青年基金项目（51602015）。

Effect of laser power and stretching force on the chemical structure and microstructure of PAN-based carbon fibers under laser graphitization

LI Sanyang¹, ZHANG Youcheng¹, SHA Yang², YAO Liangbo¹, TAN Jing¹, LI Haoyi¹, CAO Weiyu², YANG Weimin¹

1 College of Mechanical and Electronic Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2 College of Material Science and Engineering,, Beijing University of Chemical Technology, Beijing 100029, China

Received:2017-05-22 Revised:2017-09-12 Online:2018-02-05 Published:2018-02-05

摘要/Abstract

摘要： 采用自制的高温激光石墨化平台对聚丙烯腈（PAN）基碳纤维进行石墨化处理，分别在不同激光功率和不同牵伸力条件下制备了多种碳纤维实验样品，利用拉曼光谱和XRD射线衍射研究了不同条件下碳纤维样品的化学结构和微观结构。结果表明：在牵伸力不变时，随着激光功率的增大，碳纤维石墨化程度提高，当激光功率增大到一定值时，单方面继续提高激光功率对于提高碳纤维石墨化程度的影响将变小；在激光功率一定时，随着牵伸力的增大，石墨微晶尺寸L_c、L_a均逐渐增大，而d₀₀₂和取向角逐渐减小，在激光石墨化过程中，施加一定的牵伸力可以促使碳纤维中的石墨微晶沿纤维轴方向择优取向，改善微晶尺寸、减少石墨微晶层间距、提高微晶堆砌层数。

关键词: 聚丙烯腈基碳纤维, 石墨化, 激光, 微晶尺寸, 热牵伸

Abstract: The graphitization of PAN based carbon fibers was carried out on a self-made laser based high temperature graphitization platform. Serials of carbon fiber samples were prepared under different laser power and different traction conditions. Then the chemical structure and microcrystal structure of the samples were studied by Raman spectroscopy and X-ray diffraction (XRD) respectively. The results showed that if the stretching force remained constant, the graphitization degree of carbon fiber increased with the laser power. When the laser power reached a certain value, the increase of graphitization degree by solely increasing the laser power became less obvious. If the laser power remained constant, as the stretching force increased, the size of graphite crystallite L_c, L_a increased accordingly, while d₀₀₂ and the orientation angle reduced gradually. In the process of laser based graphitization of fabricating carbon fiber, exerting a certain stretching force can impel the graphite crystallite of carbon fiber to preferentially orient along the fiber axis, and finally the crystallite size is improved, and the spacing of graphite microcrystalline layer is reduced and the number of microcrystalline packing layers is increased.

Key words: PAN-based carbon fibers, graphitization, laser, crystal size, hot stretching

中图分类号:

TQ342.743

黎三洋, 张有忱, 沙扬, 姚良博, 谭晶, 李好义, 曹维宇, 杨卫民. 激光石墨化过程中激光功率和牵伸力对聚丙烯腈基碳纤维化学结构和微观结构的影响[J]. 化工进展, 2018, 37(02): 658-663.

LI Sanyang, ZHANG Youcheng, SHA Yang, YAO Liangbo, TAN Jing, LI Haoyi, CAO Weiyu, YANG Weimin. Effect of laser power and stretching force on the chemical structure and microstructure of PAN-based carbon fibers under laser graphitization[J]. Chemical Industry and Engineering Progress, 2018, 37(02): 658-663.

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激光石墨化过程中激光功率和牵伸力对聚丙烯腈基碳纤维化学结构和微观结构的影响

Effect of laser power and stretching force on the chemical structure and microstructure of PAN-based carbon fibers under laser graphitization

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