Effect of CO2 laser power intensity on the surface morphology and friction behavior of alumina ceramic brackets

2017 ◽  
Vol 80 (8) ◽  
pp. 923-929 ◽  
Author(s):  
Sayed Mahmood Rabiee ◽  
Seyedeh Zeinab Eftekhari ◽  
Valiollah Arash ◽  
Nadereh Amozegar ◽  
Alireza Fathi ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Co2 Laser ◽  
Laser Power ◽  
Alumina Ceramic ◽  
Friction Behavior ◽  
Power Intensity ◽  
Ceramic Brackets

Detection of CO2-laser power variations via plasma tube impedance changes

1980 ◽  
Vol 21 (4) ◽  
pp. 407-409 ◽  
Author(s):  
A. L. Scholtz ◽  
G. Schiffner
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Plasma Tube

EXPERIMENTAL STUDY ON THE CO2 LASER CUTTING OF NOVEL POLYAMIDE 6/FLUOROELASTOMER THERMOPLASTIC ELASTOMERIC BLENDS

2015 ◽  
Vol 88 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Shib Shankar Banerjee ◽  
Anil K. Bhowmick
Keyword(s):  
Low Power ◽  
Co2 Laser ◽  
Process Parameters ◽  
Laser Power ◽  
Laser Cutting ◽  
Manufacturing Industry ◽  
Cutting Speed ◽  
Polyamide 6 ◽  
Thermoplastic Elastomers ◽  
Dynamic Vulcanization

ABSTRACT The application of the low-power CO2 laser-cutting process to fluoroelastomer (FKM), polyamide 6 (PA6), PA6/FKM thermoplastic elastomers (TPEs), and their thermoplastic vulcanizate (TPV) is reported. The main laser process parameters studied were laser power, cutting speed, and material thickness. The value of the top and bottom widths of the slit that were formed during laser cutting (kerf width), melted transverse area, and melted volume per unit time were measured and analyzed. Interestingly, TPE showed a smaller melted area and melted volume per unit time when compared with those values with PA6. Dynamic vulcanization further decreased these values. For example, the melted areas of PA6 and TPE were 510 × 10−3 mm2 and 305 × 10−3 mm2, respectively, which reduced to 238 × 10−3 mm2 for TPV at 40 W laser power. FKM showed the lowest value (melted area of 180 × 10−3 mm2). In addition, the output quality of the cut surface was examined by measuring the root mean square (RMS) roughness of the cut edges and heat-affected zone (HAZ). The obtained results indicated that the dimension of the HAZ and RMS roughness largely decreased in TPE when compared with PA6. For example, the HAZ of PA6 was 700 μm, which decreased to 230 μm for TPE at 40 W laser power. On the other hand, HAZ was nonexistent for FKM. Infrared spectroscopic analysis showed that there was no structural change of TPE or pristine polymers after applying the low-power CO2 laser on the surface of materials. CO2 laser cutting will be a new technique in this industry, and this analysis will assist the manufacturing industry to choose a suitable laser system with exhaustive information of process parameters for cutting or machining of rubber, TPEs, and TPVs.

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.

The structure of dielectric β-SiC thin films of hollow glass waveguide for CO2 laser power delivery

2002 ◽  
Vol 43 (6) ◽  
pp. 361-365 ◽  
Author(s):  
Kuiying Li ◽  
Qi Zhang ◽  
Guiyao Zhou ◽  
Lantian Hou
Keyword(s):  
Thin Films ◽  
Co2 Laser ◽  
Laser Power ◽  
Power Delivery ◽  
Hollow Glass ◽  
Glass Waveguide

EXPERIMENTAL EVALUATION OF CO2 LASER CUTTING QUALITY OF UHSS USING OXYGEN AS AN ASSISTED GAS

2016 ◽  
Vol 78 (7) ◽  
Author(s):  
Abdul Fattah Mohamad Tahir ◽  
Ahmad Razelan Rashid
Keyword(s):  
Co2 Laser ◽  
High Strength Steel ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
High Strength ◽  
Gas Pressure ◽  
Kerf Width ◽  
Boron Steel ◽  
Major Factors

Development of new material known as Ultra High Strength Steel (UHSS) able to improve the vehicle mass thus reflecting better fuel consumption. Transformation into high strength steel has been a significant drawback in trimming the UHSS into its final shape thus laser cutting process appeared to be the solution. This study emphasizes the relationship between Carbon Dioxide (CO2) laser cutting input parameters on 22MnB5 boron steel focusing on the kerf width formation and Heat Affected Zone (HAZ). Experimental research with variation of laser power, cutting speed and assisted gas pressure were executed to evaluate the responses. Metrological and metallographic evaluation of the responses were made on the outputs that are the kerf width formation and HAZ.  Positive correlation for power and negative interaction for cutting speed were found as the major factors on formation of the kerf. For the HAZ formation, thicker HAZ were formed as bigger laser power were applied to the material. Cutting speed and gas pressure does not greatly influence the HAZ formation for 22MnB5 boron steel.

Study on Fixed Abrasive Lapping Hard and Brittle Materials with Brazed Micro Powder Diamond Disk

2013 ◽  
Vol 589-590 ◽  
pp. 451-456 ◽  
Author(s):  
Quan Cheng Li ◽  
Jian Yun Shen ◽  
Cong Fu Fang ◽  
Xi Peng Xu
Keyword(s):  
Surface Morphology ◽  
Silicon Wafer ◽  
Removal Rate ◽  
Brittle Materials ◽  
Alumina Ceramic ◽  
Diamond Disk ◽  
Hard And Brittle Materials ◽  
Fixed Abrasive

In this study, two different arrangement lapping disks fixed with brazed diamond pellets were used to lap silicon wafer and alumina ceramic. The effects of the surface morphology, roughness, and removal rate of workpiece caused by lapping pressure, lapping time, workpiece velocity, and disc arrangement were operated with serials experiments. The results of the researches provided guidance for fixed abrasive lapping of hard and brittle materials with the brazed micro powder diamond disk.

Fibre-optic cable for CO and CO2 laser power transmission

1985 ◽  
Vol 17 (4) ◽  
pp. 213-214 ◽  
Author(s):  
V.S. Alejnikov ◽  
V.G. Artjushenko ◽  
V.P. Belyaev ◽  
V.V. Vojtsekhovsky ◽  
E.M. Dianov ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Power Transmission ◽  
Fibre Optic ◽  
Fibre Optic Cable

Quality Assessment and Metallurgical Examination of Laser Welded Sheets

2009 ◽  
Vol 83-86 ◽  
pp. 611-615
Author(s):  
Numan Abu-Dheir ◽  
Bekir Sami Yilbas
Keyword(s):  
Laser Welding ◽  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Careful Examination ◽  
Welding Parameters ◽  
Weld Quality ◽  
Laser Weld ◽  
Power Intensity ◽  
Segregation Profile

Laser welding of steel 316L sheets is considered and the effects of laser welding parameters on the laser weld quality and metallurgical changes in the weld section are presented. The laser weld quality is assessed through careful examination of weld geometrical features, and the resulting weld microstructure. Metallurgical changes in the weld sites are examined using optical, and electron scanning microscope (SEM). Two levels of heat inputs are used-1500W and 2000W; and two scanning speeds of 2cm/s and 4cm/s are used to laser weld 316L sheets. It is found that at the high laser power intensities, evaporation takes place in the irradiated region and as the laser power intensity increases further, a cavity is formed at the top surface of the welding cross section. A similar situation is also observed as the laser scanning speed reduces. The low diffusivity of the alloying elements at high temperatures preserves the segregation profile. The scattered partitioning of the cells and dendrite boundaries are observed due to the presence of Cr and Mo.

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.

Core-clad silver halide fibers for CO2 laser power transmission

1991 ◽  
Author(s):  
Idan Paiss ◽  
Frank Moser ◽  
Abraham Katzir
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Power Transmission ◽  
Silver Halide
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