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学者姓名：黄婷
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<正>2023年10月27日第十九届北京激光技术前沿论坛在北京工业大学知新园学术报告厅隆重开幕,本次学术论坛由北京光学学会与中国光学光电子行业协会、中国光学学会激光加工专业委员会、固体激光技术重点实验室、北京工业大学科协、北京工业大学理学部联合主办,旨在把握激光技术发展前沿和热点、共享研究成果,促进我国激光光电子技术的科技创新与合作,为与会者搭建高水平交流平台。本刊从论坛选取了北京工业大学黄婷研究员、中国科学院空天信息创新研究院李捷研究员、中国电子科技集团公司第十一研究所眭晓林研究员的分享报告整理为笔谈,以飨读者。
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| GB/T 7714 | 黄婷 , 李捷 , 眭晓林 . 第十九届北京激光技术前沿论坛笔谈 [J]. | 北京工业大学学报 , 2024 , (07) : 1-8 . |
| MLA | 黄婷 等. "第十九届北京激光技术前沿论坛笔谈" . | 北京工业大学学报 07 (2024) : 1-8 . |
| APA | 黄婷 , 李捷 , 眭晓林 . 第十九届北京激光技术前沿论坛笔谈 . | 北京工业大学学报 , 2024 , (07) , 1-8 . |
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Significance In recent years, notable progress has been made in the development of equipment components aimed at precision and miniaturization. These miniature components typically exhibit complex geometries. They are composed of diverse materials. Further miniaturization of these components has led to an increased demand for precision welding. Consequently, the assembly of small parts and the packaging of devices require increasingly high levels of connection accuracy and quality control. High-quality micro-welding technologies for metallic materials have important applications in aerospace, power batteries, biomedicine, and other fields. For instance, micro electro mechanical systems (MEMS), characterized by feature sizes ranging from 1 mu m to 1 mm, are commonly packaged using micro-welding technology. Moreover, power battery electrode foils, with thicknesses as low as 6-12 mu m, require precise connections for current export. Furthermore, the assembly of components and metal shell sealing in implantable biomedical devices rely heavily on micro-welding technology. Common micro-welding techniques include resistance micro spot welding, ultrasonic micro-welding, micro tungsten inert gas(TIG) welding, and laser micro-welding. Compared with conventional micro-welding methods, laser micro-welding offers several advantages, including a small focusing spot size, precise heat input control capability, high welding speed, and compatibility with various weldable materials. Progress This study investigates the laser micro-welding technology of metal materials, providing a comprehensive analysis of its significance, microscale effects, welding modes, laser selection, and defect and quality control measures. It is difficult to reach a consensus on a precise definition of laser micro-welding. The connotations of laser micro-welding are comprehensively summarized based on previously reported studies. Strictly speaking, laser micro-welding pertains to a laser welding process where at least one feature size of the connected material or weld is less than 100 mu m. Laser micro-welding involves two welding modes: conduction and penetration welding. In laser micro-welding, oxidation promotes fluctuations in the penetration-welding process, resulting in a transient phase. Subsequently, the influence of microscale effects is introduced. When workpiece dimensions are reduced to the micron scale, typical microscale effects occur. The physical characteristics observed during laser micro-welding, such as heat transfer and molten pool flow, differ from those observed during macro-welding (Fig.2). Based on microscale effects, the defects and quality control measures in laser micro-welding are summarized according to the process parameters. Welding defects such as lack of penetration, burn-through, spatter, humping, porosity, and cracking can occur during the laser micro-welding process, and optimization of the welding process parameters is an important means of controlling weld formation and welding defects. These parameters include the laser wavelength, laser power, spot diameter of the laser, pulse laser parameters, welding speed, and scanning path. Furthermore, the applications of laser micro-welding to both similar and dissimilar metal materials are reviewed. Laser micro-welding is used to join precision components in the electronics, automotive, aerospace, and medical industries (Fig.12). Notable applications include pressure sensors, bipolar plates for fuel cells, aerospace engine blades, electronic component pins, copper-printed circuit boards, satellite collimator components, cardiac pacemakers, and lithium-ion battery tabs. Finally, the challenges and future development directions of laser micro-welding technology for metallic materials are summarized, including the welding mechanism of metal and non-metallic materials, new process technology, and laser micro-welding systems. Conclusions and Prospects The characteristics of laser micro-welding are complex owing to microscale effects. Although laser micro-welding has been widely used for connecting metal materials, some challenges remain. First, there is a burgeoning demand for the joining of dissimilar materials, including the micro-welding of dissimilar metals and metal/non-metallic materials. Dissimilar materials with different physical properties pose significant challenges in welding. Second, increasing the welding speed is important for improving the production rate. However, humping occurs at high welding speeds. To address this, process innovation and the recombination of multiple energy fields are required to further increase the critical speed of humping by controlling the flow characteristics of the molten pool and the solidification process during micro-welding. This is essential for improving the production rates and ensuring the product yield in high-speed welding. Finally, the development of intelligent laser micro-welding systems is a key future trend. The use of an intelligent laser micro-welding system has the potential to improve weld quality and welding efficiency
Keyword ：
application application laser technique laser technique laser micro welding laser micro welding metal foil metal foil scale effect scale effect process parameters process parameters
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| GB/T 7714 | Du, Weizhe , Huang, Xuting , Zheng, Min et al. Research Progress in Laser Micro-welding of Metal Materials (Invited) [J]. | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2024 , 51 (4) . |
| MLA | Du, Weizhe et al. "Research Progress in Laser Micro-welding of Metal Materials (Invited)" . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG 51 . 4 (2024) . |
| APA | Du, Weizhe , Huang, Xuting , Zheng, Min , Xiao, Rongshi , Huang, Ting . Research Progress in Laser Micro-welding of Metal Materials (Invited) . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2024 , 51 (4) . |
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Abstract ：
The keyhole formed during laser deep penetration welding significantly improves laser energy efficiency. However, this process involves complex interactions of multiphase, making it susceptible to welding defects like spattering and porosity. In-situ monitoring during welding can help identify key factors influencing welding stability. Nevertheless, current monitoring methods have limitations that prevent establishing a clear relationship between the vapor plume and the keyhole for accurate welding mode identification. To address these challenges, this study introduces a novel real-time multimode in-situ monitoring technology that combines ultrafast synchrotron radiation imaging with high-speed visible light imaging, allowing simultaneous observation of multiphase dynamics during laser welding. The research establishes a connection between the internal keyhole and the surface vapor plume evolution in metals. It also finds that vapor plume fluctuations indicate keyhole mode transition, challenging the traditional belief that bright vapor plume emergence signifies this transition. Additionally, the study observes keyhole oscillation frequency ranging from 3.75 kHz to 7.5 kHz, with the frequency increasing as laser power rises.
Keyword ：
Welding mode Welding mode In-situ monitoring In-situ monitoring Laser welding Laser welding
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| GB/T 7714 | Xu, Jiale , Wang, Xue , Yao, Chunxia et al. A dual in-situ monitoring of multiphase dynamics during laser wire fusion process with synchrotron radiation and visible light [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 131 : 2528-2534 . |
| MLA | Xu, Jiale et al. "A dual in-situ monitoring of multiphase dynamics during laser wire fusion process with synchrotron radiation and visible light" . | JOURNAL OF MANUFACTURING PROCESSES 131 (2024) : 2528-2534 . |
| APA | Xu, Jiale , Wang, Xue , Yao, Chunxia , Zou, Demin , Xiong, Rui , Xiao, Rongshi et al. A dual in-situ monitoring of multiphase dynamics during laser wire fusion process with synchrotron radiation and visible light . | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 131 , 2528-2534 . |
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A bendable electrode is an essential component of flexible electronics. The resistance stability against deformation is highly desired for practice. In this work, a bendable Cu electrode is fabricated by femtosecond laser direct writing (FsLDW), involving photothermal reduction of Cu ions and deposition of Cu on polyethylene terephthalate (PET) substrate. A highly conductive Cu electrode with a sheet resistance of 0.56 Omega & sdot; sq - 1 is obtained, which is improved by at least one order of magnitude over previous works. It is worth noting that the sheet resistance of the Cu electrode almost remains unchanged after 6000 downward bending cycles at a bending angle of 30 degrees and shows a slight increase after 10 adhesion tests, demonstrating excellent bending stability and adhesive strength. The porous morphology of the deposited Cu may relieve bending stress, resulting in high deformation resistance. The temperature field simulation confirms sufficient heat accumulation during FsLDW for Cu ion reduction and PET surface melting, allowing for Cu embedding on the PET surface and improving adhesion between the Cu electrode and the substrate.
Keyword ：
Flexible stability Flexible stability Bendable electrode Bendable electrode Femtosecond laser direct writing Femtosecond laser direct writing Temperature field simulation Temperature field simulation
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| GB/T 7714 | Xing, Lingrong , Cui, Mengya , Zhou, Zheng et al. Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 123 : 13-19 . |
| MLA | Xing, Lingrong et al. "Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability" . | JOURNAL OF MANUFACTURING PROCESSES 123 (2024) : 13-19 . |
| APA | Xing, Lingrong , Cui, Mengya , Zhou, Zheng , Xiao, Rongshi , Huang, Ting . Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability . | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 123 , 13-19 . |
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本发明提供了一种柔性湿度传感器超短脉冲激光直写方法，包括以下步骤：S1：制备金属盐墨水，金属盐墨水包括金属盐、还原剂和去离子水；S2：提供柔性基底，将所述金属盐墨水覆盖在柔性基底表面，将超短脉冲激光聚焦在柔性基底和金属盐墨水形成的界面；通过第一工艺参数的激光直写在柔性基底表面的特定位置实现金属离子的还原沉积生成金属，从而形成导电电极；通过第二工艺参数的激光直写在柔性基底表面的特定位置实现金属离子的还原沉积生成金属氧化物，从而形成传感电极；S3：清洗激光作用后的柔性基底表面，得到导电电极和传感电极均集成在柔性基底表面的湿度传感器。本发明制备效率高，能够实现传感器结构的设计与制造，以及电极材料的调控。
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| GB/T 7714 | 黄婷 , 邢羚榕 , 肖荣诗 et al. 一种柔性湿度传感器超短脉冲激光直写方法 : CN202310295247.X[P]. | 2023-03-23 . |
| MLA | 黄婷 et al. "一种柔性湿度传感器超短脉冲激光直写方法" : CN202310295247.X. | 2023-03-23 . |
| APA | 黄婷 , 邢羚榕 , 肖荣诗 , 崔梦雅 . 一种柔性湿度传感器超短脉冲激光直写方法 : CN202310295247.X. | 2023-03-23 . |
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Abstract ：
厚膜正极能够显著提高电池的面积比容量,从而满足实际应用需求.然而,电极厚度增加使锂离子的扩散受到限制,导致倍率性能降低,这是目前亟待解决的关键问题.使用515 nm波长飞秒激光在厚度为100 μm的NCM811正极表面制备3D结构,研究了飞秒激光刻蚀工 艺参数对刻蚀形貌的影响及刻蚀微结构特征尺寸对NCM811厚膜正极电化学性能的影响规律.研究结果表明:绿光飞秒激光刻蚀仅改变NCM811形貌,对其物相组成无明显影响;相比沟槽结构,网格结构既可提供充足的通道促进锂离子的扩散,又可避免正极材料的过度损耗.在高倍率3 C下,织构化网格正极质量比容量和面积比容量分别为92 mA·h/g和1.37mA·h/cm2,显著高于原始正极比容量(27 mA·h/g和0.58 mA·h/cm2),实现了 NCM811厚膜正极倍率性能的提升.
Keyword ：
激光刻蚀 激光刻蚀 厚膜电极 厚膜电极 飞秒激光 飞秒激光 锂离子电池 锂离子电池 激光技术 激光技术
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| GB/T 7714 | 李松原 , 曹利 , 王京博 et al. 锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究 [J]. | 中国激光 , 2023 , 50 (12) : 237-244 . |
| MLA | 李松原 et al. "锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究" . | 中国激光 50 . 12 (2023) : 237-244 . |
| APA | 李松原 , 曹利 , 王京博 , 肖荣诗 , 黄婷 . 锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究 . | 中国激光 , 2023 , 50 (12) , 237-244 . |
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Laser micro-welding differs from macro-welding in that at least one dimension of the weld is less than 100 mu m. Although process research on laser micro-welding has recently made some progress, the influence of welding mode on microstructure and corrosion resistance has remained unknown, which has been shown to have a significant influence on laser macro-welding. In this work, a single-mode fiber laser equipped with a scanning galvanometer is used to weld AISI304 stainless steel foils with a thickness of 100 mu m. Similar to laser macro -welding, keyhole formation is used to describe two welding modes, namely thermal conduction welding and penetration welding. The laser-material interaction experiences a transient phase in which the welding mode alternates between conduction welding and penetration welding as reported by previous work. However, we show that gas protection eliminates the transient phase, proving that the transient phase develops as a result of the unsteadiness of the penetration welding caused by oxidation during the welding process. The crystallographic texture and phase constitution vary between conduction and penetration welds due to variations in heat transfer behavior during welding. The conduction weld has greater sigma 3 CSL boundaries and a more uniform micro-structure than the penetration weld, resulting in better corrosion resistance.
Keyword ：
Welding mode Welding mode Laser micro-welding Laser micro-welding Corrosion resistance Corrosion resistance Microstructure Microstructure
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| GB/T 7714 | Du, Weizhe , Xu, Jiejie , Xiao, Rongshi et al. Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
| MLA | Du, Weizhe et al. "Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties" . | OPTICS AND LASER TECHNOLOGY 161 (2023) . |
| APA | Du, Weizhe , Xu, Jiejie , Xiao, Rongshi , Huang, Ting . Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties . | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
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Laser direct writing (LDW) is a promising approach for fabricating metallic micropatterns on transparent substrates for transparent electronic circuits that satisfy both electronic and optical criteria. However, high efficiency and precision patterning remain a challenge for both photochemical and photothermal LDW. Here, a novel method is proposed with a femtosecond laser to achieve a highly-efficient photothermal process via single-photon absorption by photosensitive particles (SPA-FsLDW). The dispersive photosensitive particles act as numerous heating sources, enabling simultaneous multiple-location photothermal reactions and highly-efficient metallization due to heat-induced metal ion reduction. The new approach effectively exploits the excellent heat-input regulation with the ultrashort pulse of the femtosecond laser to achieve great temperature controllability and precision. It is shown that, with a deposition rate of approximate to 10(7) mu m(3) s(-1) and electrical resistivity of approximate to 10(-7) omega m, SPA-FsLDW improves efficiency and electrical resistivity by at least one order of magnitude compared to previously reported FsLDW. A self-powered sensor is fabricated using SPA-FsLDW, demonstrating its practical applicability.
Keyword ：
metallic micropatterns metallic micropatterns high-efficiency high-efficiency laser direct writing laser direct writing femtosecond laser femtosecond laser
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| GB/T 7714 | Cui, Mengya , Huang, Ting , Peng, Zeyu et al. High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2023 , 8 (8) . |
| MLA | Cui, Mengya et al. "High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate" . | ADVANCED MATERIALS TECHNOLOGIES 8 . 8 (2023) . |
| APA | Cui, Mengya , Huang, Ting , Peng, Zeyu , Xing, Lingrong , Zhou, Zheng , Guo, Liang et al. High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate . | ADVANCED MATERIALS TECHNOLOGIES , 2023 , 8 (8) . |
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In a wide range of applications, rapid fabrication of metallic patterns on a transparent substrate is highly desired. In this work, a highly conductive Cu wire with a sheet resistance of 0.27 omega/sq is deposited on glass through femtosecond laser-induced reduction of Cu ions. The present work improves the deposition efficiency by at least one order of magnitude compared to previous works. The effects of scanning speed, laser intensity, and effective pulse number on composition, morphology, dimensions, and conductivity of the deposited Cu are investigated. The process window is established with the goal of achieving optimal laser parameters for creating highly conductive Cu. With a scanning speed of 600 mm/s, an intensity of 1.21 x 10(10) W/cm(2), and an effective pulse number of 38500, the well-formed Cu in the process window has a sheet resistance of less than 1 omega/sq and the highest deposited efficiency of 4.60 x 10(7) mu m(3)/s. The current-carrying performance of the deposited Cu is also investigated for prospective use as a circuit material, demonstrating the Cu wire's electrical and thermal durability. In addition, temperature rise could be estimated from Cu wire width and sheet resistance with given Cu wire length and applied current, which could aid in laser parameter selection.
Keyword ：
Cu pattern Cu pattern Current-carrying performance Current-carrying performance Reduction of Cu2+ Reduction of Cu2+ Femtosecond laser induced-reduction Femtosecond laser induced-reduction
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| GB/T 7714 | Cui, Mengya , Huang, Ting , Xiao, Rongshi . Rapid fabrication of conductive copper patterns on glass by femtosecond Laser-Induced reduction [J]. | APPLIED SURFACE SCIENCE , 2022 , 588 . |
| MLA | Cui, Mengya et al. "Rapid fabrication of conductive copper patterns on glass by femtosecond Laser-Induced reduction" . | APPLIED SURFACE SCIENCE 588 (2022) . |
| APA | Cui, Mengya , Huang, Ting , Xiao, Rongshi . Rapid fabrication of conductive copper patterns on glass by femtosecond Laser-Induced reduction . | APPLIED SURFACE SCIENCE , 2022 , 588 . |
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本发明提供一种异种金属激光点焊的光束整形装置及激光焊接设备，涉及光学设备领域，异种金属激光点焊的光束整形装置包括激光器、准直镜、光学衍射元件和振镜，激光器用于输出高斯光束；准直镜的输入端通过导光件与激光器的输出端连接，准直镜用于对激光器输出的激光束进行扩束并对激光束进行准直；光学衍射元件的输入端与准直镜的输出端相对设置。通过对激光束进行整形，可使激光束在待焊工件表面形成两个光斑，应用于铝/铜异种金属激光螺旋点焊时，可实现熔钎焊和熔焊相结合的焊接方式，相较于传统的熔焊方式具有金属间化合物少，焊点强度更高，焊点电阻更小的优点。应用于动力电池铝/铜异种金属极耳焊接，能够提升电池电学性能及稳定性。
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| GB/T 7714 | 杜伟哲 , 苏坤 , 黄婷 et al. 一种异种金属激光点焊的光束整形装置及激光焊接设备 : CN202210656974.X[P]. | 2022-06-10 . |
| MLA | 杜伟哲 et al. "一种异种金属激光点焊的光束整形装置及激光焊接设备" : CN202210656974.X. | 2022-06-10 . |
| APA | 杜伟哲 , 苏坤 , 黄婷 , 肖荣诗 . 一种异种金属激光点焊的光束整形装置及激光焊接设备 : CN202210656974.X. | 2022-06-10 . |
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