scholarly journals Hydrophobization of Metal Surfaces

2019 ◽  
Vol 8 (4) ◽  
pp. 6715-6720
Keyword(s):  
Laser Radiation ◽  
Radiation Power ◽  
Scanning Speed ◽  
Pulse Frequency ◽  
Wetting Angle ◽  
Laser Spot ◽  
Spot Diameter ◽  
Laser Impact ◽  
Laser Beam Scanning ◽  
Laser Spot Diameter

This work describes possibility to create texturized surfaces by their modification using laser equipment with the aim to achieve steady heterogeneous wetting regime. Experimental results regarding the influence of laser radiation variables on wetting angle are given for steel (20Kh13) and aluminum (D16T) surfaces. This was aided by variation of main variables of laser impact, namely: radiation power (from 10 to 20 W), laser beam scanning speed (from 100 to 500 mm/s), pulse frequency (from 20 to 80 kHz). Analysis of the results has revealed that the maximum wetting angles for steel and aluminum surfaces are 147.64° and 150.27°, respectively, they have been obtained upon laser texturizing at the same variables of laser radiation. The influence of laser spot diameter on wetting angle has been determined upon impact on steel (20Kh13) surface. This has been aided by lenses the with focal lengths of 163 and 100 mm, their laser spot diameters are 59 and 25 µm, respectively. It has been revealed that, other conditions being equal, the wetting angles are higher at higher laser spot diameter (59 µm).

Bending Deformation of Pure Titanium Plate in CO2 Laser Forming

2007 ◽  
Vol 329 ◽  
pp. 625-630 ◽  
Author(s):  
Koichi Okuda ◽  
Y. Sugie ◽  
Masayuki Nunobiki
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Pure Titanium ◽  
Laser Spot ◽  
Laser Forming ◽  
Titanium Plate ◽  
Bending Angle ◽  
Spot Diameter ◽  
Bending Deformation ◽  
Laser Spot Diameter

This study deals with behaviour of bending deformation in CO2 laser forming process of titanium. CO2 laser forming technique was applied for a pure titanium plate with thickness of 1 mm to aim the development of new bending process. The experiments of laser forming were carried out with a CO2 laser machine. The bending angle and the temperature of workpiece were examined under the condition of various laser power, feed speed and laser spot diameter. Based on the experimental results, it was found that the bending deformation behaved greatly depending on the laser power and the laser spot diameter. The bending angle increased with an increase in the laser power. The bending direction tended to change from the laser irradiation side to its opposite side when the large laser spot diameter was applied.

Analysis and comparison of semiconductor materials processed at IR vs. UV laser wavelengths for DRAM yield enhancement applications

2005 ◽  
Vol 890 ◽  
Author(s):  
Andy E. Hooper ◽  
Allen Kawasaki ◽  
Paul Kirby ◽  
Robert Hainsey ◽  
Jeongho Bang ◽  
...  
Keyword(s):  
Laser Energy ◽  
Yield Enhancement ◽  
Laser Spot ◽  
Semiconductor Layer ◽  
Semiconductor Materials ◽  
Uv Laser ◽  
Spot Diameter ◽  
Materials Used ◽  
Laser Spot Diameter

ABSTRACTThis report demonstrates the effects of IR and UV laser energy on common semiconductor layer stack materials used for DRAM laser fuses. By moving from IR to UV wavelengths it is possible to significantly shrink the laser spot diameter from ∼1.6 μm to 0.8 μm. Effects and concerns for the absorption of UV energy by Si, SiO2, nitrides, and oxynitrides are also presented.

Simulation of Drilling Micro-Hole by a Dual CO2 Laser Beam Irradiated Sticking Plaster

2012 ◽  
Vol 203 ◽  
pp. 519-522
Author(s):  
Zhi Ming Rao ◽  
Xian Bo Xiao ◽  
Zhi Fang He
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Laser Power ◽  
Laser Spot ◽  
Beam Power ◽  
Analysis Software ◽  
Element Analysis ◽  
Spot Diameter ◽  
Micro Hole ◽  
Laser Spot Diameter

We explore a simulation model of drilling micro-hole in sticking plaster heated with a dual CO2 laser beam. This paper applied numerical simulation of temperature by using finite element analysis software Ansys to study a model of drilling on sticking plaster. A dual CO2 laser spot sizes ranged from 0.15 to 0.2mm radius with axial irradiance power levels of 50-100w. For temperatures above 450°C, sticking plaster would be vaporized. The size of ventilation holes changed with beam power and laser spot diameter. The width of the hole is increases with the increasing laser diameter and with the increasing laser power. These results can guide to laser drilling experiments.

scholarly journals Thermophysical analisis of modification of the surface of the workpiece by laser radiation

2019 ◽  
pp. 92-98
Author(s):  
M. N. Vereschagin ◽  
S. N. Tselueva ◽  
M. Yu. Tseluev
Keyword(s):  
Laser Radiation ◽  
Radiation Power ◽  
Scanning Speed ◽  
Heat Propagation ◽  
Temperature Fields ◽  
Straight Line ◽  
Beam Section ◽  
Distribution Of Power ◽  
Distribution Of Power Density ◽  
Modification Of The Surface

The paper presents a thermophysical analysis of modifying the surface of a workpiece by laser radiation due to the melting of a layer of a doping substance previously deposited on the surface of the base metal.The process of heating a two-layer metallic system with a laser pulse with a normal distribution of power density over the beam section is considered. Under the action of a heat source of constant power, moving in a straight line at a constant speed, the process of heat propagation tends to the limiting quasistationary state, when the temperature field does not change with time and moves along with the source.The dependences obtained allow us to estimate the effect of the laser treatment mode on the distribution of temperature fields, establish the patterns of heat propagation and relate them to phase transformations in the metal.It has been established that the technological modes of exposure to laser radiation are limited by the value of the energy per pulse from 4 to 12 J. The choice of technological modes of exposure is determined by the combination of the scanning speed of the laser beam and the radiation power.

Influence of Laser Spot Diameter on Cladding Layer Cracking

2015 ◽  
Vol 52 (3) ◽  
pp. 031401 ◽  
Author(s):  
付福兴 Fu Fuxing ◽  
畅庚榕 Chang Gengrong ◽  
赵小侠 Zhao Xiaoxia ◽  
张艳丽 Zhang Yanli
Keyword(s):  
Laser Spot ◽  
Spot Diameter ◽  
Cladding Layer ◽  
Laser Spot Diameter

Influence of the laser-spot diameter on photo-ablation rates

1995 ◽  
Vol 60 (1) ◽  
pp. 13-17 ◽  
Author(s):  
B. Wolff-Rottke ◽  
J. Ihlemann ◽  
H. Schmidt ◽  
A. Scholl
Keyword(s):  
Laser Spot ◽  
Spot Diameter ◽  
Photo Ablation ◽  
Laser Spot Diameter

Simulation of Temperature and Stress Field of Titanium Alloys under Laser Cladding

2011 ◽  
Vol 301-303 ◽  
pp. 87-92 ◽  
Author(s):  
Zhi Ren ◽  
Yan Ling Tian ◽  
Ming Yue Zhou ◽  
Huan Ying Zheng ◽  
Shuai Zhang
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Laser Cladding ◽  
Negative Correlation ◽  
Laser Power ◽  
Laser Spot ◽  
Powder Layer ◽  
Spot Diameter ◽  
Tc4 Titanium Alloy ◽  
Laser Spot Diameter

Titanium alloys which exhibit excellent material properties like a high strength to weight ratio and good corrosion resistance have become the important structural materials in the applications of the aerospace. However, it’s quite difficult to repair the damages of the titanium alloy parts such as fatigue crack and erosion resulted from poor working environment using the traditional manufacturing technology while the problem can be easily solved with the help of laser cladding technology. For the excellent quality of the fixed parts, it is extraordinarily significant to obtain the rule of the temperature and thermal stress distribution in the cladding process. To investigate the influencing rule of cladding coating's temperature and stress on laser cladding process parameters, the model of laser cladding based on TC4 titanium alloy is built by the way of finite element method (FEM). This model encompasses the effects of the temperature-dependent thermal conduction and radiation as well as the latent heat of fusion. Different laser processing parameters are chosen to calculate the temperature and stress of cladding layer.The result shows that the temperature of the clad coating is positive correlation with the raise of laser power and the depth of the powder layer, and negative correlation with the raise of scanning speed and the laser spot diameter. In addition, the transient stress of clad coating is augmented with the increase of laser scanning velocity, laser spot diameter and the depth of the clad coating while it’s negative correlation with the raise of laser power. The numerical results provide the theoretical guidance for optimization of the laser cladding parameters on TC4 titanium alloy.

Measurement of Cutting Edge Width of a Rotary Cutting Tool by Using a Laser Displacement Sensor

2014 ◽  
Vol 8 (1) ◽  
pp. 28-33 ◽  
Author(s):  
So Ito ◽  
◽  
Sho Sekine ◽  
Yuki Shimizu ◽  
Wei Gao ◽  
...  
Keyword(s):  
Light Intensity ◽  
Cutting Tool ◽  
Calibration Method ◽  
Laser Spot ◽  
Displacement Sensor ◽  
Laser Displacement Sensor ◽  
Spot Diameter ◽  
Reflected Light ◽  
Tool Edge ◽  
Laser Spot Diameter

This paper introduces the widthmeasurement of a cutting tool edge by utilizing a laser triangulation displacement sensor. By using the reflected light intensity of the laser displacement sensor, micrometric edge width which is smaller than the diameter of the laser beam spot can be measured. With regard to the quantitative evaluation of the laser spot diameter, a calibration method of the laser spot diameter is achieved by using the pin-gauges. The diameter of the laser spot is obtained by using the pin-gauges, and the relationship between the reflected light intensity and the diameter of the pin-gauges are investigated. The width of the cutting tool edge is measured by the calibrated laser spot diameter, and then the reproducibility is evaluated.

scholarly journals Laser marking as environment technology

2017 ◽  
Vol 7 (1) ◽  
pp. 303-316 ◽  
Author(s):  
Lydia Sobotova ◽  
Miroslav Badida
Keyword(s):  
Surface Texturing ◽  
Colour Change ◽  
Scanning Speed ◽  
Pulse Frequency ◽  
Morphological Characterization ◽  
Laser Surface Texturing ◽  
Environment Friendly ◽  
Laser Marking ◽  
Laser Beam Scanning

AbstractThe contribution deals with the laser marking as one of the progressive and environment friendly technologies with utilisation in many branches of industry. Engraving and other types of laser marking of different types of materials are very actual technologies these days. Laser marking decreases the waste creation in comparison with the other classical marking technologies, which use paintings or created chips. In this experimental investigation the laser marking surface texturing of material AL99,7 according to STN 42 4003:1993-08 (STN EN 573) has been conducted. The laser marking machine TruMark 6020 and software TruTops Mark were used. Laser surface texturing after laser marking has been realised under different combinations of process parameters: pulse frequency, pulse energy and laser beam scanning speed. The morphological characterization of engraving or annealing surfaces has been performed using scanning electron microscopy (SEM) technique. The evaluation of roughness of engraved surfaces has been realized according to STN EN ISO 4287 by using Surftest SJ 301. The aim of the contribution was to show how different laser parameters affect the surface texture and colour change of metallic materials while creating minimal waste.

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