超短脉冲激光精细加工芳纶纤维增强树脂基复合材料  

Ultrashort pulse laser fine processing of aramid fiber-reinforced polymer composites

作　　者：何光宇 李遥遥 李朋 王明伟[1] HE Guangyu;LI Yaoyao;LI Peng;WANG Mingwei(Institute of Modern Optics,Nankai University,Tianjin 300350,China;Xi'an Micromach Technology Co.,Ltd.,Xi'an,Shaanxi 710100,China)

机构地区：[1]南开大学现代光学研究所,天津300350 [2]西安中科微精光子科技股份有限公司,陕西西安710100

出　　处：《光电子．激光》2024年第12期1313-1322,共10页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(12174201,62375145)资助项目。

摘　　要：芳纶纤维增强树脂基复合材料(aramid fiber-reinforced polymer,AFRP)具有高模量、高比强度、质量轻等优点,在航空航天领域有着重要应用。为克服AFRP机械、磨料水射流和连续激光加工中存在的拉毛、分层和热影响区(heat-affected zone,HAZ)过大等问题,开展了超短脉冲激光加工AFRP的实验研究。实验测定了AFRP样品的烧蚀阈值,讨论了脉冲通量、激光频率和扫描速度等参数对HAZ与锥度的影响。结果表明,1030 nm、230 fs飞秒激光加工AFRP的单脉冲烧蚀阈值为0.8153 J/cm^(2),脉冲累计因子为0.5987;HAZ随脉冲通量的增大而增大,锥度随脉冲通量的增大而减小;扫描速度为500 mm/s,脉冲通量为4—6 J/cm^(2),脉冲频率为100—200 kHz时,可以平衡HAZ与锥度,获得HAZ≤20μm、锥度≤2°、内壁光滑无拉毛、分层的精密加工效果。此项研究为精密加工AFRP提供了一种可行的技术途径,具有潜在应用价值。Aramid fiber-reinforced polymer(AFRP)has the advantages of high modulus,high specific strength,and light weight,and has important applications in the aerospace field.In order to overcome the problems in AFRP machine,abrasive water jet and continuous laser processing,such as hair drawing,delamination and large heat-affected zone(HAZ),we carried out the experimental study of ultra-short pulse laser processing AFRP.The ablation threshold of AFRP samples was measured experimentally,and the effects of pulse flux,laser frequency and scanning speed on the HAZ and taper were discussed.The results show that the single-pulse ablation threshold of AFRP processed by 1030 nm and 230 fs femtosecond laser is 0.8153 J/cm^(2),and the pulse accumulation factor is 0.5987.The HAZ increases and the taper decreases with the increase of pulse flux.When the scanning speed is 500 mm/s,the pulse flux is 4—6 J/cm^(2),and the pulse frequency is 100—200 kHz,the HAZ and taper can be balanced,and the precision machining effect of HAZ≤20μm,taper≤2°and smooth layer without hair drawing,delamination on the inner wall can be obtained.This study provides a feasible technical approach for precision machining AFRP and has potential application value.

关 键 词：超短脉冲激光 芳纶纤维增强树脂基复合材料(AFRP) 精细加工 烧蚀阈值 热影响区(HAZ) 

分 类 号：TN332[电子电信—物理电子学]