scholarly journals Development of high power laser ablation process for polycrystalline diamond polishing: Part 1. Fundamental understanding of PCD ultra-short pulsed laser ablation

2018 ◽  
Author(s):  
William Scalbert ◽  
Ronald Holtz ◽  
David Tanner ◽  
Fathima Laffir
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Polycrystalline Diamond ◽  
Pulsed Laser Ablation ◽  
High Power Laser ◽  
Ablation Process ◽  
Power Laser ◽  
Laser Ablation Process ◽  
Diamond Polishing ◽  
Fundamental Understanding

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.

scholarly journals A Model of Ultra-Short Pulsed Laser Ablation of Metal with Considering Plasma Shielding and Non-Fourier Effect

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3163 ◽  
Author(s):  
Sheng Tan ◽  
Jianjun Wu ◽  
Yu Zhang ◽  
Moge Wang ◽  
Yang Ou
Keyword(s):  
Laser Ablation ◽  
Plasma Plume ◽  
Great Influence ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ablation Process ◽  
Conduction Model ◽  
Laser Ablation Process ◽  
Wide Range ◽  
Plasma Shielding

In this paper, a non-Fourier heat conduction model of ultra-short pulsed laser ablation of metal is established that takes into account the effect of the heat source, laser heating of the target, the evaporation and phase explosion of target material, the formation and expansion of the plasma plume, and interaction of the plasma plume with the incoming laser. Temperature dependent optical and thermophysical properties are also considered in the model due to the properties of the target will change over a wide range during the ultra-short pulsed laser ablation process. The results show that the plasma shielding has a great influence on the process of ultra-short pulsed laser ablation, especially at higher laser fluence. The non-Fourier effect has a great influence on the temperature characteristics and ablation depth of the target. The ultra-short pulsed laser ablation can effectively reduce the heat affected zone compared to nanosecond pulsed laser ablation. The comparison between the simulation results and the experimental results in the literature shows that the model with the plasma shielding and the non-Fourier effect can simulate the ultra-short pulsed laser ablation process better.

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