皮秒激光切割PBO纤维增强复合材料  

Cutting of PBO Fiber-Reinforced Composites Using Picosecond Lasers

作　　者：张学聪 钱静 付强[2] 王关德[2] 刘军[2] 崔红[3] 张承双[3] 包艳玲[3] 戴晔[1] 赵全忠[2] Zhang Xuecong;Qian Jing;Fu Qiang;Wang Guande;Liu Jun;Cui Hong;Zhang Chengshuang;Bao Yanling;Dai Ye;Zhao Quanzhong(Department of Physics,Shanghai University,Shanghai 200444,China;State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Xi'an Aerospace Composites Research Institute,Xi'an,Shaanxi 710025,China)

机构地区：[1]上海大学物理系,上海200444 [2]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [3]西安航天复合材料研究所,陕西西安710025

出　　处：《中国激光》2020年第10期55-64,共10页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB1107501);国家自然科学基金(61675214,11774220)。

摘　　要：一次性整体成型或传统的加工方式已不能满足聚对苯撑苯并双噁唑(PBO)纤维增强复合材料精密加工和装配的要求。首先分别采用波长为355 nm的紫外皮秒激光和波长为1030 nm的红外皮秒激光对PBO纤维增强复合材料进行切割加工,加工过程中采用渐进式焦点下移和多道扫描策略;然后采用扫描电子显微镜观察了复合材料的切割截面形貌,分析了材料的物理去除机制和加工热损伤;最后研究了激光功率、扫描速度和方向、脉冲重复频率等激光参数与切割质量、切割效率之间的关系。实验结果表明:紫外皮秒激光可以实现“冷加工”和光化学效应,得到了较高的切割质量;激光焦点随加工进程下移可以有效提高加工质量并改善材料切割表面的一致性。研究结果表明,采用8 W、400 kHz、1000 mm/s的激光参数可以进行高质、高效的材料加工。The precision machining and assembly requirements of poly(p-phenylene-benzobisoxazole) (PBO) fiber-reinforced composites cannot be satisfied using direct integral forming or traditional machining methods. First, we cut PBO fiber-reinforced compositions using different picosecond lasers (with wavelengths of 355 nm and 1030 nm), apply a progressively downshifted focus, and implement multi-pass scanning strategy. The cross-section morphologies of the processed samples were observed using scanning electron microscopy, and the mechanisms of material removal and thermal damage of the materials were analyzed. Finally, the cutting quality and efficiency were related to the laser parameters (laser power, scanning speed and direction, and pulse repetition rate). The UV picosecond laser achieved “cold processing” and a photochemical effect with high cutting quality. The downshift of laser focus with the machining process effectively improved the machining quality and consistency of the material cutting surface. The high-quality and efficient material processing can be achieved with laser power of 8 W, repetition rate of 400 kHz and scanning speed of 1000 mm/s.

关 键 词：激光技术 激光与物质相互作用 皮秒激光 聚对苯撑苯并双噁唑纤维增强复合材料 表面质量 热损伤 加工效率 

分 类 号：TN249[电子电信—物理电子学]