scholarly journals Groove Formation on Metal Substrates by Nanosecond Laser Removal of Melted Material

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2026
Author(s):  
John V. Amiaga ◽  
Alejandro Ramos-Velazquez ◽  
Sergey G. Gorny ◽  
Svetlana A. Vologzhanina ◽  
Alexandre Michtchenko
Keyword(s):  
Groove Depth ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Effective Strategy ◽  
Fine Dust ◽  
Steel Substrates ◽  
Number Of Passes ◽  
Melted Material ◽  
Standard Techniques ◽  
Nanosecond Laser Radiation

An effective strategy to produce grooves on carbon steel substrates by nanosecond laser radiation is proposed. The aim is to increase the productivity of grooves creation. In this study, two different modes of laser treatment are compared. The first mode focuses on the evaporation of material, while the second focuses on the formation of melted material and its removal by the action of pressure vapors produced by evaporated material. Within some ranges of processing parameters, the shape of the groove can be linearly controlled. The dependence of the groove depth also has a logarithmic nature when the number of passes is increased. Using the liquid phase mode in some ranges of parameters can reduce the amount of evaporated material in comparison with standard techniques in which the material is removed in the form of gas, and fine dust is emitted.

scholarly journals Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2240 ◽  
Author(s):  
Peter Gregorčič ◽  
Marjetka Conradi ◽  
Luka Hribar ◽  
Matej Hočevar
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Stainless Steel Surface ◽  
Textured Surfaces ◽  
Laser Texturing ◽  
Important Challenge ◽  
Faster Development

Controlling the surface wettability represents an important challenge in the field of surface functionalization. Here, the wettability of a stainless-steel surface is modified by 30-ns pulses of a Nd:YAG marking laser (λ = 1064 nm) with peak fluences within the range 3.3–25.1 J cm−2. The short- (40 days), intermediate- (100 days) and long-term (1 year) superhydrophilic-to-(super)hydrophobic transition of the laser-textured surfaces exposed to the atmospheric air is examined by evaluating its wettability in the context of the following parameters: (i) pulse fluence; (ii) scan line separation; (iii) focal position and (iv) wetting period due to contact angle measurements. The results show that using solely a short-term evaluation can lead to wrong conclusions and that the faster development of the hydrophobicity immediately after laser texturing usually leads to lower final contact angle and vice versa, the slower this transition is, the more superhydrophobic the surface is expected to become (possibly even with self-cleaning ability). Depending on laser fluence, the laser-textured surfaces can develop stable or unstable hydrophobicity. Stable hydrophobicity is achieved, if the threshold fluence of 12 J cm−2 is exceeded. We show that by nanosecond-laser texturing a lotus-leaf-like surface with a contact angle above 150° and roll-off angle below 5° can be achieved.

Effect of Friction Stir Processing Parameters on the Properties of AA7075-T73/Al2O3 Surface Metal Matrix Composite

2020 ◽  
Vol 1002 ◽  
pp. 140-150
Author(s):  
Ali H. Al-Helli ◽  
Ahmed R. Alhamaoy ◽  
Ayad Murad Takhakh
Keyword(s):  
Friction Stir Processing ◽  
Particle Distribution ◽  
Surface Hardness ◽  
Base Material ◽  
Processing Parameters ◽  
Optical Microscope ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Metal ◽  
Number Of Passes

Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences, showed that Al2O3 particles were in a good interior distribution inside the basement. This technique produced excellent bonding between the surface composite and the base material. On other hand the surface hardness was increased about 25% as compared with the substrate. In addition, grain matrix refinement and enhanced particle distribution were obtained after each FSP pass. Also the dispersion of Al2O3 particles in the stirred area became more homogeneous and the average hardness improved by increasing the number of passes.

scholarly journals Pico- to nanosecond pulsed laser-induced forward transfer (LIFT) of silver nanoparticle inks: a comparative study

2019 ◽  
Vol 125 (12) ◽  
Author(s):  
J. Mikšys ◽  
G. Arutinov ◽  
G. R. B. E. Römer
Keyword(s):  
Surface Area ◽  
Silver Nanoparticle ◽  
Laser Fluence ◽  
Printed Electronics ◽  
Functional Materials ◽  
Picosecond Laser ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Forward Transfer ◽  
Nanoparticle Inks

Abstract Silver nanoparticle inks are among the key functional materials used in printed electronics. Depositing it by laser-induced forward transfer remains a challenging task because the non-linear rheological nature of these inks narrows the range of the laser processing parameters. Understanding, therefore, the influence of the laser parameters on the ejection dynamics and deposition quality is of critical importance. The influence of the laser pulse duration from pico- to nanosecond-laser-induced jet dynamics was investigated using time-resolved shadowgraphy imaging. Jet speed and surface area analyses showed that in the lower laser fluence level range, picosecond pulses induce higher surface area ejections which propagate at higher velocities. As the laser fluence levels were increased, the difference in jet velocity and surface area evolutions narrows. Deposition analysis showed a similar behavior with lower transfer thresholds and larger depositions at lower fluence range when picosecond-laser pulses were used.

Simple Fabrication of Superhydrophobic Surfaces Using Atmospheric-Pressure Plasma

2018 ◽  
Vol 941 ◽  
pp. 1808-1814 ◽  
Author(s):  
Elham Vazirinasab ◽  
Reza Jafari ◽  
Gelareh Momen ◽  
Tony Carreira
Keyword(s):  
Chemical Composition ◽  
Plasma Treatment ◽  
Silicone Rubber ◽  
Atmospheric Pressure ◽  
Chemical Characterization ◽  
Atmospheric Pressure Plasma ◽  
Processing Parameters ◽  
Superhydrophobic Surfaces ◽  
Pressure Plasma ◽  
Number Of Passes

Nature-inspired superhydrophobic surfaces have received immense industrial and academic interest due to their non-wettability and self-cleaning properties. To fabricate superhydrophobic silicone rubber surfaces, a simple, environmentally friendly atmospheric-pressure plasma treatment was applied. The effect of diverse plasma processing parameters on the final wettability behavior of the substrates, including plasma power, plasma frequency, number of passes, plasma jet speed, plasma cycle time and distance between the nuzzle outlet and substrate, were analyzed by means of design of experiments (DoE). Surface chemical characterization illustrated the influence of plasma treatment on the chemical composition of the produced silicone rubber. Furthermore, the presence of microstructures as well as the chemical composition of the surface was confirmed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy analysis.

Crystallization of Amorphous Germanium Films and Multilayer a-Ge/a-Si Structures upon Exposure to Nanosecond Laser Radiation

2019 ◽  
Vol 53 (3) ◽  
pp. 400-405 ◽  
Author(s):  
V. A. Volodin ◽  
G. K. Krivyakin ◽  
G. D. Ivlev ◽  
S. L. Prokopyev ◽  
S. V. Gusakova ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Nanosecond Laser ◽  
Amorphous Germanium ◽  
Germanium Films ◽  
Nanosecond Laser Radiation

Optimisation of Plasma Nitrocarburising for Reducing Wear in Dry Sliding Contacts

2016 ◽  
Vol 721 ◽  
pp. 389-393 ◽  
Author(s):  
Igor Velkavrh ◽  
Florian Ausserer ◽  
Stefan Klien ◽  
Joel Voyer ◽  
Alexander Diem ◽  
...  
Keyword(s):  
Surface Topography ◽  
Layer Thickness ◽  
Tool Steel ◽  
Compound Layer ◽  
Processing Parameters ◽  
Dry Sliding ◽  
Tribological Behaviour ◽  
Micromechanical Properties ◽  
Wear And Friction ◽  
Steel Substrates

In this study, tool steel substrates were plasma-nitrocarburised at different processing parameters and afterwards tribologically tested under non-lubricated sliding conditions. It was observed that the micromechanical properties of the compound layer (thickness, hardness, roughness, surface topography) strongly affect the tribological behaviour of the nitrocarburised surface and can be tailored through the adjustment of the nitrocarburising parameters so that very favourable wear and friction behaviours can be achieved.

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