Laser Micromachining Modeling and Laser Machined Surface Errors Prediction for Biomedical Applications

2012 ◽  
Author(s):  
Plawut Wongwiwat ◽  
Roger J. Narayan ◽  
Yuan-Shin Lee
Keyword(s):  
Laser Ablation ◽  
Biomedical Applications ◽  
Gaussian Function ◽  
Beam Propagation ◽  
Laser Micromachining ◽  
Direct Write ◽  
Machined Surface ◽  
Propagation Modeling ◽  
Micro Channels ◽  
Matlab Programming

This paper presents an analytical modeling and laser micromachining technique of microchannel and micro-structures for bio-devices manufacturing and biomedical applications. The ablation of the laser micromachining with direct-write method has been modeled and simulated for micro-channels or microstructures in bio-devices microfabrication. In this paper, the analytical model was adapted from the linear function for beam propagation in our previous research by using the Gaussian function to improve modeling accuracy. Basically, the new laser ablation model based on Gaussian distribution, beam propagation modeling and Beer’s law were used to formulate and model the laser ablation phenomenon. After the simulation with MATLAB programming, the actual experiment on laser micromachining has been conducted to compare the simulated results with the actual ones. Finally, the purposed modeling technique can be applied in the surface error analysis and biomedical applications. The example case in this paper showed how the modeling could solve the complex phenomenon of the overlapping in laser micromachining.

Analyzing the Possibility of Using Laser Ablation for Texturing Bearing Steel 100CrMn6 Considering a Tribological Aspect

2015 ◽  
Vol 220-221 ◽  
pp. 673-677
Author(s):  
Wojciech Napadłek
Keyword(s):  
Laser Ablation ◽  
Roller Bearing ◽  
Laser Micromachining ◽  
Bearing Steel ◽  
Micro Channels

The publication analyzes the possibility of applying laser ablation for texturing bearing steel 100CrMn6 considering a tribological aspect. The use of different variants of laser micromachining, including pulsed radiation (λ = 1.064 μm) and the geometric texture of the surface, facilitated with obtaining the characteristic stereometry of the surface with regularly arranged micro-channels of lubrication on the surface of roller bearing steel.

Evaluation of DPI Change Impact on Laser Machined Surface Quality

2014 ◽  
Vol 474 ◽  
pp. 369-374
Author(s):  
Jana Knedlova ◽  
Libuše Sýkorová ◽  
Vladimír Pata ◽  
Martina Malachová
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Laser Micromachining ◽  
Technological Parameters ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Machined Surface Roughness ◽  
Change Impact

The article focuses on the field of PMMA laser micromachining at change of the technological parameters. The aim was to evaluate machined surface roughness at different setting of DPI definition (number of dots paths on square inch). Commercial CO2laser Mercury L-30 by firm LaserPro, USA was used for experimental machining. Ray of laser could be focused on mark diameter d=185 mm.

Ultrafast Laser Micromachining and Patterning of Thermal Spray Multilayers for Novel Sensor Fabrication

2003 ◽  
Author(s):  
Q. Chen ◽  
J. P. Longtin ◽  
S. Sampath ◽  
R. J. Gambino
Keyword(s):  
Thermal Spray ◽  
Thermal Spray Technology ◽  
Laser Micromachining ◽  
Ultrafast Laser ◽  
Direct Write ◽  
Additive Process ◽  
Pattern Design ◽  
Wide Range ◽  
Functional Patterns ◽  
Rapid Prototyping And Manufacturing

Fabrication of structural and functional parts and components, especially at the micro and nano scales, is crucial to a wide range of applications in the electronics, communications, medical, aerospace, and military industries. This work presents an innovative conformal direct-write technique for rapid prototyping and manufacturing novel sensors. The technique combines thermal spray, which, as an additive process, produces blanket depositions of films and coatings, with ultrafast laser micromachining, a subtractive process to produce functional patterns. Several kinds of sensing components, such as microheaters and strain gauges, have been successfully fabricated in this work with thermal spray technology and a femtosecond laser, which demonstrates the feasibility and advantages of the proposed technique. The electrical and thermal property characterization of the sensors was also performed, and shows promise for sensors in micro-sensing systems. With minor modification to pattern design and processing procedures, various sensing structures and electronic components, for example, precision resistors and interdigitated capacitors, can be readily fabricated using the presented technique.

scholarly journals Product and Process Fingerprint for Nanosecond Pulsed Laser Ablated Superhydrophobic Surface

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 177 ◽  
Author(s):  
Yukui Cai ◽  
Xichun Luo ◽  
Zhanqiang Liu ◽  
Yi Qin ◽  
Wenlong Chang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Laser Ablation ◽  
Process Parameters ◽  
Superhydrophobic Surface ◽  
Surface Characterization ◽  
Pulsed Laser ◽  
Threshold Value ◽  
Machined Surface ◽  
Water Contact ◽  
Nanosecond Pulsed Laser

Superhydrophobic surfaces have attracted extensive attention over the last few decades. It is mainly due to their capabilities of providing several interesting functions, such as self-cleaning, corrosion resistance, anti-icing and drag reduction. Nanosecond pulsed laser ablation is considered as a promising technique to fabricate superhydrophobic structures. Many pieces of research have proved that machined surface morphology has a significant effect on the hydrophobicity of a specimen. However, few quantitative investigations were conducted to identify effective process parameters and surface characterization parameters for laser-ablated microstructures which are sensitive to the hydrophobicity of the microstructured surface. This paper proposed and reveals for the first time, the concepts of process and product fingerprints for laser ablated superhydrophobic surface through experimental investigation and statistical analysis. The results of correlation analysis showed that a newly proposed dimensionless functional parameter in this paper, Rhy, i.e., the average ratio of Rz to Rsm is the most sensitive surface characterization parameter to the water contact angle of the specimen, which can be regarded as the product fingerprint. It also proposes another new process parameter, average laser pulse energy per unit area of the specimen (Is), as the best process fingerprint which can be used to control the product fingerprint Rhy. The threshold value of Rhy and Is are 0.41 and 536 J/mm2 respectively, which help to ensure the superhydrophobicity (contact angle larger than 150°) of the specimen in the laser ablation process. Therefore, the process and product fingerprints overcome the research challenge of the so-called inverse problem in manufacturing as they can be used to determine the required process parameters and surface topography according to the specification of superhydrophobicity.

Pulsed laser ablation and deposition of bioactive glass as coating material for biomedical applications

1999 ◽  
Vol 138-139 ◽  
pp. 527-532 ◽  
Author(s):  
L. D'Alessio ◽  
R. Teghil ◽  
M. Zaccagnino ◽  
I. Zaccardo ◽  
D. Ferro ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Bioactive Glass ◽  
Biomedical Applications ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Coating Material
Sign in / Sign up

Export Citation Format

Share Document