摘要
研究探索金属与玻璃异种材料的连接技术是推动其大规模应用的关键,其中,对热膨胀系数相差大的玻璃与金属进行连接的超短脉冲激光焊接技术,对于提升精密微型器件的制造水平和应用具有重要意义。笔者利用有限元模型分析了石英玻璃与304不锈钢飞秒激光焊接过程的温度场,验证了所用激光焊接工艺参数的焊接可行性。为优化飞秒脉冲激光焊接工艺参数,研究了飞秒激光焊接单脉冲能量对焊接质量的影响规律。结果表明:激光单脉冲能量对热效应有显著影响;热应力因热效应的增强而增大,当其超过石英玻璃的损伤阈值后会导致微裂纹产生,进而导致焊接样品的焊接强度降低;最佳工艺参数是激光单脉冲能量5.6μJ,重复频率500 kHz,扫描速度60 mm/s,此工艺参数下焊接样品的剪切强度最大,可达到13 MPa。对两种材料的焊接机理进行了研究,结果表明:激光焊接石英玻璃与304不锈钢实现了冶金结合;Fe、Cr在界面与SiO2可能发生了氧化还原反应,形成了Fe2O3和Cr2O3。
Objective Glass-metal connections can expand the applications of glass in many industrial fields,and glass connectors have been widely used in semiconductor devices,automotive manufacturing,and other industries.Joints fabricated by the traditional bonding method have a low working temperature and can easily produce volatile gases,which limit their application range.However,laser welding has the advantages of high energy density,noncontact,small heat-affected area,and high welding accuracy,which can realize high-quality glass-metal connections.In recent years,the technology of ultrashort pulse laser welding of dissimilar materials has received increasing research attention.However,temperature field simulations of femtosecond laser welding of dissimilar materials have rarely been reported,and the effects of laser single-pulse energy on weld quality must be further studied.In this study,the effects of femtosecond pulse laser welding energy on the weld morphology,welding strength,and welding mechanism were studied,and the temperature field in the welding process was analyzed using a finite element model.Methods In this study,a two-dimensional axisymmetric geometric model was established,and a Gaussian body heat source was applied at the middle interface of the model.A finite element simulation of the temperature field of the femtosecond pulse laser welding of silica glass and 304 stainless steel was conducted to verify the feasibility of the welding parameters.The femtosecond pulse laser wavelength,pulse width,repetition rate,and laser single-pulse energy were 1030 nm,300 fs,500 kHz,and 4.2-7.8μJ,respectively.In the experiment,the treated silica glass was tightly bonded with 304 stainless steel to enable the sample to reach the optical contact state and was then placed on the laser welding platform.Following adjustments to the focus position through the displacement platform in the z direction,the laser was focused on the interface between the silica glass and 304 stainless steel for welding.After the welded sample
作者
袁锦辉
霍靖宇
张博元
王磊
郑重
李嘉铭
郭亮
罗爱平
张庆茂
Yuan Jinhui;Huo Jingyu;Zhang Boyuan;Wang Lei;Zheng Zhong;Li Jiaming;Guo Liang;Luo Aiping;Zhang Qingmao(Guangdong Provincial Key laboratory of Nanophotonic Functional Materials and Devices,School of Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,Guangdong,China;Shenzhen Zhongji Automation Co.,Ltd.,Shenzhen 518105,Guangdong,China;Shenzhen TsingRui Technology Co.,Ltd.,Shenzhen 518000,Guangdong,China;Guangdong Provincial Key laboratory of Industrial Ultrashort Pulse Laser Technology,Shenzhen 518055,Guangdong,China;Guangdong Key Laboratory for Special Fiber Photonic Devices,South China Normal University,Guangzhou 510006,Guangdong,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第16期31-39,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(62005081,92050101)
广东省重点领域研发计划(2020B090922006)
广东省基础与应用基础研究项目(2021A1515011932,2020A1515110985,2023A1515011641)
广州市科协青年人才托举项目(QT-2023-007)。
关键词
激光技术
飞秒激光焊接
异种材料焊接
焊缝形貌
焊接强度
焊接机理
laser technique
femtosecond laser welding
dissimilar materials welding
weld morphology
welding strength
welding mechanism
