Article
Materials Science, Ceramics
Wanqin Zhao, Xuesong Mei, Lingzhi Wang
Summary: In laser microstructure machining, the competitive mechanism of laser processing parameters (LPPs) and their effect on machining results were studied. The study found that single-pulse energy played a dominant role in determining ablation and surface morphology, while laser pulses assumed a dominant role after a certain point, defining final hole dimensions and sidewall morphology.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Chenchong Wang, Zhen Zhang, Xueyong Jing, Zenan Yang, Wei Xu
Summary: In this study, a process optimization framework combining molecular dynamics simulation, machine learning, and high-throughput optimization algorithm is proposed to solve efficiency and quality problems in femtosecond laser percussion drilling. The framework can establish the relationship between laser parameters and target machining performance quickly and accurately, and determine the optimal process.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Zhen Zhang, Zhao Xu, Chenchong Wang, Shangyu Liu, Zenan Yang, Qiang Zhang, Wei Xu
Summary: By using molecular dynamics simulation to analyze cluster behavior during femtosecond laser ablation, a two-stage pulse energy percussion drilling process has been proposed to effectively control cluster behavior and reduce the taper of microholes.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
A. Feuer, R. Weber, R. Feuer, D. Brinkmeier, T. Graf
Summary: The study discovered that the quality of percussion-drilled holes is influenced by the laser fluence, with a minimum fluence of 2.8 times the ablation threshold required for high-quality microholes in stainless steel. The edge quality of the drilled microholes depends on the laser fluence reaching the rear exit of the hole and changes with the number of pulses applied after breakthrough.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Analytical
Chau-Shing Wang, Yang-Hung Hsiao, Huan-Yu Chang, Yuan-Jen Chang
Summary: This study applies artificial neural networks to predict parameters for drilling blind holes in stainless steel, and pre-simulates the drilling results before actual processing. The experimental findings confirm the accuracy and practicality of this method, which contributes to improving the efficiency of the laser drilling process.
Article
Optics
Yan-qing Yu, Liu-cheng Zhou, Zhen-bing Cai, Wei-feng He
Summary: Research was conducted on the surface morphology changes induced by femtosecond laser on single-crystal superalloy and thermal barrier coating, with discussion on the ablation mechanisms in different regions. The results showed similar ablation thresholds for single-crystal superalloy and TBC, but different dominant mechanisms.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Daniel Holder, Rudolf Weber, Thomas Graf, Volkher Onuseit, David Brinkmeier, Daniel J. Foerster, Anne Feuer
Summary: A simplified analytical model is presented to predict the depth progress and final hole depth obtained by laser percussion drilling in metals with ultrashort laser pulses. Experimental validation confirms the accuracy of the model for percussion drilling in stainless steel with picosecond pulses.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
David Brinkmeier, Daniel Holder, Andre Loescher, Christoph Roecker, Daniel J. Foerster, Volkher Onuseit, Rudolf Weber, Marwan Abdou Ahmed, Thomas Graf
Summary: Commercial ultrafast lasers with kW power levels show potential for high-volume manufacturing, but limitations such as particle shielding, atmosphere breakdown, and heat accumulation need to be addressed. Experimental validation of a thermal model for AISI 304 steel drilling highlights the importance of a critical heat accumulation threshold. A processing map summarizes these limits and provides guidance for parameter selection and laser suitability, stressing the importance of process parallelization.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Gul Dogan, Frank Chiu, Sam U. H. Chen, Mebil R. T. David, Andreas Michalowski, Michael Schaenzel, Christian Silber, Gisela Schuetz, Corinne Grevent, Kahraman Keskinbora
Summary: Atomic layer deposited (ALD) oxide thin films are attractive for copper encapsulation, passivation, and protection due to their chemical inertness and high-temperature stability. Plasma etching successfully removes the encapsulation layer, providing a clean interface for conductive vias. The study results are essential for future ALD layer applications in the encapsulation of copper and other critical components in semiconductor fabrication processes.
MATERIALS & DESIGN
(2021)
Article
Optics
Levent Subasi, Mustafa Gokler, Ulas Yaman
Summary: Laser drilling is an effective method for creating cooling holes on gas turbine parts. Waterjet guided laser (WJGL) is a hybrid process that offers improved machining results by coupling a laser beam with a thin cylindrical waterjet. It has potential for micro drilling operations on aerospace jet engine parts. However, further research is needed to understand the effects of process variables on material removal rate.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yong Zhao, Xi-Xin Wang, Ri-Qing Lv, Gui-Lin Li, Hong-Kun Zheng, Yi-Fan Zhou
Summary: A highly sensitive reflective Fabry-Perot magnetic field sensor using magnetic fluid and based on the Vernier effect was proposed and experimentally verified in this study. The sensor showed high sensitivity, good linearity, and a high resolution within a certain range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Manufacturing
Pierre Balage, John Lopez, Guillaume Bonamis, Clemens Honninger, Inka Manek-Honninger
Summary: We present novel findings on top-down percussion drilling in various glasses using femtosecond laser GHz-bursts. By exploiting the particular light-matter interaction regime combining nonlinear absorption and thermal cumulative effects, we successfully obtained crack-free holes with aspect ratios exceeding 30 in sodalime glass and 70 in fused silica. The results are discussed in terms of inner wall morphology, aspect ratio, and drilling speed.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Review
Materials Science, Multidisciplinary
Ishwer Shivakoti, Golam Kibria, Robert Cep, Bal Bahadur Pradhan, Ashis Sharma
Summary: Laser surface texturing (LST) is an effective method for generating texture on work surface and has shown tremendous potential for biomedical applications, improving the efficacy of biomaterials significantly. It has extreme potential for surface modification of biomaterial and can be utilized for biomedical applications.
Article
Energy & Fuels
Yumei Li, Tao Zhang, Zefang Tian, Yiming Zheng, Zengmin Yang
Summary: In this study, a 3D FEM of compound percussive system was used to simulate the dynamic single-cutter-rock interaction, and sensitivity analysis was conducted to investigate the effects of impact velocity, dynamic load amplitude, and torsional to axial impact frequency ratio on cutting force and penetration depth. The results showed that the cutting force increases first and then decreases rapidly with the increase in torsional impact velocity, and the penetration depth increases with dynamic load and impact velocity amplitudes. The study also found that stronger rock achieved higher penetration depth, and the penetration rate demonstrated improvement under both axial and torsional impacts.
Article
Chemistry, Physical
Erik Saborowski, Philipp Steinert, Thomas Lindner, Andreas Schubert, Thomas Lampke
Summary: Laser structuring is extensively studied for metal surface-pretreatment to enhance adhesion in polymer-metal hybrids. Cone-like protrusions exhibit excellent wetting behavior and high compound strength but require significant processing time. This paper investigates a process strategy for creating scalable pin structures using single pulse drilling with an Nd/YVO4 nanosecond laser system on EN AW-6082 aluminum alloy. Experimental results show that pulse drilling can achieve pin structures with high aspect ratio and strength values comparable to cone-like protrusions, but with a much higher processing rate.
