Investigation on Surface Morphology and Dimensional Characteristics of Micro-channels Fabricated on Titanium-V Alloy by DPSS Nd:YAG Laser

2021 ◽  
Author(s):  
Samir Kumar Panda ◽  
Sweta Rout ◽  
Debasish Panigrahi ◽  
Debabrata Dhupal
Keyword(s):  
Surface Morphology ◽  
Nd:Yag Laser ◽  
Micro Channels

Experimental investigations of nanosecond-pulsed Nd:YAG laser beam micromachining on 304 stainless steel

2018 ◽  
Vol 1 (1) ◽  
pp. 62-75 ◽  
Author(s):  
Rasmi Ranjan Behera ◽  
Mamilla Ravi Sankar ◽  
Prahlad Kumar Baruah ◽  
Ashwini Kumar Sharma ◽  
Alika Khare
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Laser Beam ◽  
Nd:Yag Laser ◽  
Research Work ◽  
Scanning Speed ◽  
304 Stainless Steel ◽  
Experimental Investigations ◽  
Micro Channel ◽  
Micro Channels

The demand for miniaturized components is increasing day by day as their application varies from industry to industry such as biomedical, micro-electro-mechanical system and aerospace. In the present research work, high-quality micro-channels are fabricated on 304 stainless steel by laser beam micromachining process with nanosecond Nd:YAG laser. The laser pulse energy (LPE), scanning speed (SS) and scanning pass number (SP No.) are used as the process parameters, whereas the depth and width of the kerf as well as the surface roughness are used to characterize the micro-channels. It is found that the kerf depth, width and surface roughness decrease with increase in the SS. The kerf depth sharply increases with increase in the SP No. The kerf width is minimum at 30 mJ LPE, 400 µm s‒1 SS and 10 SP No. The minimum surface roughness is observed at 30 mJ LPE, 500 µm s‒1 SS and 10 SP No. The oxygen content is found to gradually decrease with the distance from the centre of the micro-channel. Based on the experimental results, optimized input parameters can be offered to control the micro-channel dimensions and improve their surface finish effectively on stainless steel.

Experimental Investigation On the Change in Flow Boiling Characteristics Due to Boiling-Induced Copper Ageing

2021 ◽  
Author(s):  
Prasanna Jayaramu ◽  
Shashwat Jain ◽  
Sateesh Gedupudi ◽  
Sarit Kumar Das
Keyword(s):  
Surface Morphology ◽  
Surface Characterization ◽  
Flow Boiling ◽  
Surface Oxidation ◽  
Surface Characteristics ◽  
Heat Sinks ◽  
Micro Channel ◽  
Fresh Sample ◽  
Characterization Study ◽  
Micro Channels

Abstract Heat sinks and heat exchangers based on flow boiling in mini/micro-channels are expected to be more compact and efficient. One of the major challenges while using copper material for phase-change heat transfer application is the change in surface characteristics after prolonged usage due to the thermal oxidation of surface over time. The present study involves the repeated experimental runs of flow boiling of water in a 1 mm hydraulic diameter end-milled copper channel to verify the influence of ageing on the thermal and hydraulic performance. As it is difficult to measure the surface wettability in a mini/micro-channel, the present work makes use of the ageing and surface characterization study conducted on the dummy copper samples to infer the influence of ageing on mini/micro-channel surface characteristics and consequently its boiling performance. The test involves measuring over a period of time the wetting behaviors of the end-milled copper samples left in water at three different conditions, one in a constant temperature bath maintained at 60 oC and 1 atm and the remaining two in a pool of boiling water at 110 oC and 120 oC. The study compares the fresh sample and the aged sample for the surface oxidation, surface chemical composition and surface morphology, and discusses the changes in contact angle and surface morphology caused by copper ageing.

scholarly journals Angular distribution and forward peaking of laser produced plasma ions

2005 ◽  
Vol 23 (2) ◽  
pp. 131-135 ◽  
Author(s):  
M. SHAHID RAFIQUE ◽  
M. KHALEEQ-UR-RAHMAN ◽  
MUHAMMAD SHAHBAZ ANWAR ◽  
FARYAAL MAHMOOD AFSHAN ASHFAQ ◽  
KHURRAM SIRAJ
Keyword(s):  
Angular Distribution ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Nd:Yag Laser ◽  
Optical Microscope ◽  
Cu Substrate ◽  
Plasma Ions ◽  
Cr 39 Detectors ◽  
Scanning Electron

This paper represents the results of a study of angular distribution of laser produced ions (LPI) of Al, Cu, and Ag. The angular distribution is studied by CR-39 (SSNTD) and ion assisted sputtering experiments. A Q-Switched Nd:YAG laser (1.064 μm, 1.1 MW) with 10 mJ pulsed energy was used to produce the Ag ions, which were detected by CR-39 detector mounted at −17.5°, 0°, 17.5°, 30°, 60°, and 90° from the normal to the target placed at a distance of 9 cm from the target. Etched CR-39 detectors then observed under the Motic DMB Series optical microscope. A bunch of ions was detected along the normal of target due to self generated collimation of ions. This is termed as Forward Peaking of Laser Produced Ions. Similar results were also observed from sputtering of polished Al substrate by laser produced ions of Cu and Sputtering of polished Cu substrate by laser produced ions of Al. The surface morphology of the ion irradiated samples were observed under the Scanning Electron microscope (SEM) S 300 Hi-tech. Formation of a circular damage on the surface of the substrates by irradiation conforms the ions collimation along the normal or Forward Peaking of ions.

Pulsed Nd:YAG laser machining of nitinol: An experimental investigation

2021 ◽  
pp. 251659842110154
Author(s):  
B. Muralidharan ◽  
K. Prabu ◽  
G. Rajamurugan
Keyword(s):  
Nd:Yag Laser ◽  
Electrical Discharge Machining ◽  
Beam Quality ◽  
Cutting Speed ◽  
Recast Layer ◽  
Machining Process ◽  
Machined Surface ◽  
Pulsed Nd:Yag Laser ◽  
High Pulse Frequency ◽  
Micro Channels

Nickel–Titanium (Ni-Ti) shape memory alloy, commonly called nitinol alloys, finds its primary application in the production of biomedical implants, mainly because of itsrare properties such asshape memory, superelasticity and superior biocompatibility. Laser cutting is anon-traditional machining process for the production ofparts with close tolerances andcomplex geometry. Electrical discharge machining (EDM) of nitinol is associated with more heat-affected zone (HAZ) and recast layer thickness. This article aims to study nitinol’s machining characteristics by alaser source with good beam quality to have a less HAZ, recast layer and striations. Experiments were designed and carried out using central composite designs (CCD) by a pulsed Nd:YAG laser. Analysis based on the different parameters chosen was conducted to determine the parameters; effects, including laser power, frequency and cutting speed concerning the surface roughness. From the results, it is observed that the presence of HAZ is measured up to1. 48 mm from the machined surface. The topography analysis reveals that the striation is identified at high speeds, with less pulse overlapping by columnar micro channels, which can be reduced at high pulse frequency.

Machining of Micro-Channels on Brittle Glass Using an Abrasive Slurry Jet

2010 ◽  
Vol 443 ◽  
pp. 639-644 ◽  
Author(s):  
King Lun Pang ◽  
Thai Nguyen ◽  
Jing Ming Fan ◽  
Jun Wang
Keyword(s):  
Surface Morphology ◽  
Smooth Surface ◽  
Particle Concentration ◽  
Machined Surface ◽  
Large Wave ◽  
Abrasive Slurry Jet ◽  
Ductile Mode ◽  
Micro Channels ◽  
Wave Patterns

This paper presents a study of using an abrasive slurry jet for the machining of micro channels on brittle glasses. The machined surface morphology and channel dimensions are used to assess the technology. Surface morphology was found featuring with two types of wave patterns; one was along the channels with large wave lengths as a result of the jet deflection during the motion of nozzle, and the other was due to viscous flow that resulted in smooth surface eroded predominantly by ductile mode. The investigation showed that using higher jet pressure and higher particle concentration enables to create channels with higher depth, although these widened the channels and degraded the surface quality in some cases by inducing a larger number of pit fragments on the surface. With proper control of the operating parameters, this technology can be used for machining micro channels on brittle materials with high quality of surface finish.

Micro-channels by Nd:YAG laser beam machining: fabrication, microstructures, and micro-hardness profiles

2015 ◽  
Vol 85 (9-12) ◽  
pp. 1955-1968 ◽  
Author(s):  
Naveed Ahmed ◽  
Saied Darwish ◽  
Abdulrehman M. Alahmari ◽  
Muhammad Ali Shar
Keyword(s):  
Laser Beam ◽  
Nd:Yag Laser ◽  
Micro Hardness ◽  
Laser Beam Machining ◽  
Micro Channels

Laser-Annealed Gap Ohmic Contacts for High-Temperature Devices

1980 ◽  
Vol 1 ◽  
Author(s):  
O. Eknoyan ◽  
W. Van Der Hoeven ◽  
T. Richardson ◽  
W.A. Porter
Keyword(s):  
High Temperature ◽  
Surface Morphology ◽  
Nd:Yag Laser ◽  
Ohmic Contacts ◽  
Electrical Characteristics

ABSTRACTThe results of successful Nd:YAG laser annealed ohmic contacts on n-type GaP are reported. Comparisons on identical laser and thermal annealed contacts on the same substrates are performed. In addition aging investigations are also studied. The results indicate that laser annealed contacts have far superior electrical characteristics, much better surface morphology and are substantially more stable with aging than the same but thermally alloyed ones.

scholarly journals MORPHOLOGY AND COMPOSITION ANALYSIS OF ENAMEL SURFACE WITH DENTAL ADHESIVE FOLLOWING THE APPLICATION OF ND:YAG ABLATION

2020 ◽  
Vol 82 (6) ◽  
pp. 63-70
Author(s):  
Fatanah Mohamad Suhaimi ◽  
Nurul Atiqah A. Razak ◽  
Nur Syazana Azizan ◽  
Mohd Aizat Abu Bakar ◽  
Mohammad Khairul Azhar Abdul Razab ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Elemental Composition ◽  
Nd:Yag Laser ◽  
Laser Energy ◽  
Morphological Changes ◽  
Energy Parameter ◽  
Enamel Surface ◽  
Tooth Surface ◽  
Composition Analysis ◽  
Healthy Human

Nd:YAG laser with a wavelength of 1064 nm has been used for various applications in dentistry, including for soft tissue and hard tissue applications. This study aimed to investigate the changes in morphological structures and elemental composition of enamel surface after composite removal using energy variations of Nd:YAG laser. 12 healthy human premolar teeth were cut into half, and Blūgloo adhesives were applied to the tooth surface. The samples were subjected to Nd:YAG laser irradiations with three different energy parameters, 510 mJ, 540 mJ, and 580 mJ. The changes in enamel surface morphology and composition of elements were analyzed using Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray (EDX). Surface morphology indicates that 540 mJ can potentially be used for composite adhesives removal. For the elemental composition, carbon, phosphorus, and calcium were statistically significant between samples without composite, after bracket debonding, and after laser irradiation. Several morphological changes may occur on the enamel surface after samples were irradiated with a laser. Energy parameter of the laser plays a vital role towards the desired surface. In this study, 540 mJ is seen to be potential for material removal process on the enamel surface.

scholarly journals Effect of Laser Beam Conditioning on Fabrication of Micro-Channels in Al2O3 Bio-ceramics Using Nd:YAG Laser

2019 ◽  
Vol 521 ◽  
pp. 012001
Author(s):  
Basem M. A. Abdo ◽  
Abdulaziz Al-Tamimi ◽  
Abdulrahman Al-Ahmari ◽  
Hisham Alkhalefah
Keyword(s):  
Laser Beam ◽  
Nd:Yag Laser ◽  
Micro Channels
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