Comparative Assessment of the Laser-Induced Plasma Micromachining and the Ultrashort Pulsed Laser Ablation Processes

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Kumar Pallav ◽  
Ishan Saxena ◽  
Kornel F. Ehmann
Keyword(s):  
Laser Ablation ◽  
Material Removal ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Comparative Assessment ◽  
Ablation Process ◽  
Laser Induced Plasma ◽  
Laser Ablation Process ◽  
Matter Interaction ◽  
Ultrashort Pulsed Laser

The ultrashort pulsed laser ablation process is a well-established micromachining process and has been at the center of manufacturing research in the past decade. However, it has its own limitations, primarily due to the involvement of various material-specific laser and machining process parameters. The laser-induced plasma micromachining (LIP-MM) is a novel tool-less and multimaterial selective material removal type of micromachining process. In a manner similar to ultrashort pulsed laser ablation, it also removes material through an ultrashort pulsed laser beam. However, instead of direct laser–matter interaction, it uses the laser beam to generate plasma within a transparent dielectric media that facilitates material removal through plasma–matter interaction and thus circumvents some of the limitations associated with the ultrashort pulsed laser ablation process. This paper presents an experimental investigation on the comparative assessment of the capabilities of the two processes in the machining of microchannels in stainless steel. For this purpose, microchannels were machined by the two processes at similar pulse energy levels and feed-rate values. The comparative assessment was based on the geometric characteristics, material removal rate (MRR), heat-affected zone and shock-affected zone (HAZ, SAZ), and the range of machinable materials.

scholarly journals Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

2020 ◽  
Vol 10 (5) ◽  
pp. 1779 ◽  
Author(s):  
Jaime Taha-Tijerina ◽  
Sadasivan Shaji ◽  
Sreed Sharma Kanakkillam ◽  
Maria Isabel Mendivil Palma ◽  
Karla Aviña
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ablation Process ◽  
Negative Effects ◽  
Mineral Oils ◽  
Manufacturing Operations ◽  
Laser Ablation Process ◽  
The Coefficient Of Friction ◽  
Maximum Improvement

Lubricants and fluids are critical for metal-mechanic manufacturing operations as they reduce the friction and wear of tooling and components, and serve as coolants to dissipate the heat generated in these operations. The proper application of these materials improves machine operative life and tooling, and decreases cost, energy, and time consumption for maintenance, damage, repairs, or the need to exchange pieces/components within the machinery. Natural or vegetable-based lubricants have emerged as a substitute for mineral oils, which harm the environment due to their low biodegradability and have negative effects on human health (e.g., causing skin/respiratory diseases). Thus, finding biocompatible and efficient lubricants has become a technology objective for researchers and industry. This study evaluates soybean-, corn-, and sunflower-based lubricants reinforced with silver (Ag) nanostructures by a pulsed laser ablation process. Thermal and tribological evaluations were performed with varying Ag contents, and temperature-dependent behavior was observed. Thermal conductivity improvements were observed for all nanofluids as the temperature and Ag concentration increased (between 15% and 24%). A maximum improvement of 24% at 50 °C and 10 min exposure time of the pulsed laser ablation process for soybean oil was observed. The tribological evaluations showed improvements in the load-carrying capacity of the vegetable oils, i.e., an increase from 6% to 24% compared to conventional materials. The coefficient of friction performance also showed enhancements with Ag concentrations between 4% and 15%.

Modeling of Cut Depth and Surface Analyses of Silicon Wafer in Laser Micromachining Process

2016 ◽  
Vol 835 ◽  
pp. 242-247
Author(s):  
Seksit Mekloy ◽  
Viboon Tangwarodomnukun ◽  
Chaiya Dumkum
Keyword(s):  
Laser Ablation ◽  
Surface Morphology ◽  
Laser Power ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Surface Characteristics ◽  
Substrate Material ◽  
Ablation Process ◽  
Laser Ablation Process ◽  
Cut Depth

Silicon has widely been used as a substrate material in various microfabrication processes. Cut depth and surface morphology of silicon obtained from laser ablation process have to be well controlled to achieve the required features of micro-components being made. Though laser power has been known as a major factor affecting these responses, the detailed investigations of this factor on cut geometries and surface quality have still been deficiency. In this research, the cut geometries and surface characteristics of silicon induced by a pulse laser were experimentally investigated. The increase in laser power not only increased the cut dimensions, but also increased the debris deposition on and inside the cut channel. Furthermore, an analytical model was developed in this study to predict the cut depth of silicon in pulsed laser ablation, and an agreement between the prediction and experiment was also demonstrated.

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