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Effect of Laser Beam Conditioning on Fabrication of Micro-Channels in Al <sub/>2</sub> O <sub/>3</sub> Bio-ceramics Using Nd:YAG Laser
摘要： In the present study, laser micro-milling tests were carried out to fabricate micro-channels on Alumina bio-ceramics (Al2O3), using a Q-Switched 30W Nd:YAG pulsed laser. A systematic approach based on a full factorial Design of Experiment (DoE) has been successfully applied with the aim to detect which and how the key input laser process parameters affect the channel dimensional accuracy. The examined process parameters were the laser beam scanning speed, the pulse frequency and the pulse intensity. Optical microscope was used to analyze the channel geometries responses (i.e. channel's top width, bottom width, depth, and taper wall angle). Moreover, mathematical models for predicting the micro-channel geometries are successfully proposed for controlled micro-milling of micro-channels in Al2O3. Results reveal that, the change of scanning speed and laser intensity significantly affected the ablated channel’s geometries. Further it is observed that the channel depth and width increase linearly with increasing of laser intensity and decreasing of scanning speed and not much affected by changing of pulse frequency. Finally, the experimental results bear a good agreement with the proposed prediction models.
关键词： micro-channels,Nd:YAG laser,Al2O3 bio-ceramics,Design of Experiment,Laser micro-milling
更新于2025-09-23 15:21:01
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An experimental study on joining of AISI 304 SS to Cu by Nd-YAG laser welding process
摘要： In this current study, a challenging dissimilar metal combination AISI 304 stainless steel and copper is welded by pulsed wave Nd-YAG laser welding process without use of any filler material, followed by its mechanical as well as metallurgical investigation. Macroscopic as well as microscopic examination of the weld surface and weld bead has been carried out to observe the weld penetration depth and metallurgical behavior inside the weld zone. Weld pool geometry confirms about attainment of full penetration depth in pulsed wave Nd-YAG laser and also describes that the penetration depth is directly proportional pulse energy as (penetration depth7 J = 69%) < (penetration depth14 J = 82%) < (penetration depth21 J = 100%). The formed copper micro-channels suggest that the copper solidifies last and flows inside the weld zone matrix during the solidification. The average width of the heat affected zone (HAZ) and partially melting zone (PMZ) have been found to be 23.0 mm and 6.0 mm on the stainless steel (SS) side respectively. The microhardness (MH) study shows that (MHCopper = 75 HV0.1) < (MHWeld zone = 90–200 HV0.1) < (MHSS = 210 HV0.1).
关键词： PMZ,Copper micro-channels,HAZ,Dissimilar metal,Nd-YAG laser
更新于2025-09-23 15:21:01
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Experimental investigation and optimization of laser induced plasma micromachining using flowing water
摘要： In this study, laser induced plasma micromachining using flowing water (F-LIPMM) was performed to create micro-channels on stainless steel surface. The effects of process parameters (water speed, laser pulse energy, frequency and scanning speed) on the responses of micro-channel width, depth, material removal rate (MRR) and heat affected zone (HAZ) were investigated based on response surface methodology (RSM). The regression models for the machined width, depth, MRR and HAZ were developed, and the adequacies of the developed models were subsequently verified by analysis of variance (ANOVA) method. Finally, grid structures consisting of desired micro-channels were created with the optimum process parameters: water speed of 8 m/s, pulse energy of 10.4 μJ, frequency of 15.8 kHz and scanning speed of 2.7 mm/s. The uniform micro-channels with smooth bottoms, side-walls and small HAZ were obtained, and the results showed that the predicted responses using the developed models were comparable with the experimental results.
关键词： Laser induced plasma micromachining,RSM,Micro-channels,Flowing water
更新于2025-09-16 10:30:52
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Laser-treated glass platform for rapid wicking-driven transport and particle separation in bio microfluidics
摘要： In this work, we present a laser-based fabrication technique for direct patterning of micro-channels consisting of interconnected micro-cracks on soda-lime glass. Using a CO2 laser to deposit energy at a linear rate of 18.75 to 93.75 mJ mm?1, we were able to manipulate the micro-crack formation, while enabling rapid manufacturing and scalable production of cracked-glass microfluidic patterns on glass. At the higher end of the energy deposition rate (93.75 mJ mm?1), the laser fabricated microfluidic channels (1 mm wide and 20 mm long) had extremely fast wicking speeds (24.2 mm s?1, ～10 faster than filter paper) as a result of significant capillary action and laser-induced surface hydrophilization. At the lower end (18.75 mJ mm?1), 3–4 mm wide micro-cracked crevices resulted in an increased mesh/sieve density, hence, more efficiently filtering particle-laden liquid samples. The reproducibility tests revealed an averaged wicking speed of 10.6 ± 1.5 mm s?1 measured over 21 samples fabricated under similar conditions, similar to that of filter paper (～85%). The micro-cracked channels exhibited a stable shelf life of at least 82 days with a wicking speed within 10–13 mm s?1.
关键词： laser-based fabrication,particle separation,soda-lime glass,micro-channels,wicking speeds
更新于2025-09-11 14:15:04