Surface Morphology and Wall Angle Comparison of Microchannels Fabricated in Titanium Alloy Using Laser-Based Processes

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Suman Bhandari ◽  
Nicolas Martinez-Prieto ◽  
Jian Cao ◽  
Kornel Ehmann
Keyword(s):  
Laser Ablation ◽  
Surface Morphology ◽  
Wall Angle ◽  
Sem Images ◽  
Laser Induced Plasma ◽  
Technological Gap ◽  
Angle Measurements ◽  
Direct Laser ◽  
Morphological Differences ◽  
3D Scans

Abstract The increase in the usage of titanium alloys for micro-engineering applications has driven the demand for improved micromanufacturing processes. Laser-based microfabrication processes such as direct laser ablation (DLA), laser-induced plasma micromachining (LIPMM), and magnetically controlled laser-induced plasma micromachining (MC-LIPMM) are promising technologies to fill this technological gap. In this paper, we evaluate microchannels fabricated in Ti6Al4V substrates using laser ablation, LIPMM, and MC-LIPMM. Scanning electron microscope (SEM) images and 3D scans of the channels were used to compare the surface morphology and channel geometry for different feed rates and number of laser passes. Wall angle measurements show that the LIPMM processes yield channels with steeper walls and smoother walls in comparison with the channels fabricated using direct ablation. The clear morphological differences on the surface finish of the walls made by direct ablation and using laser-induced plasmas hint at the differences in material removal mechanisms between these manufacturing methods.

A comparative study of direct laser ablation and laser-induced plasma-assisted ablation on glass surface

2021 ◽  
pp. 103737
Author(s):  
Yani Xia ◽  
Xiubing Jing ◽  
Dawei Zhang ◽  
Fujun Wang ◽  
Syed Husain Imran Jaffery ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Comparative Study ◽  
Glass Surface ◽  
Laser Induced Plasma ◽  
Direct Laser

Multi-Material Capability of Laser Induced Plasma Micromachining

2014 ◽  
Author(s):  
Ishan Saxena ◽  
Kornel Ehmann
Keyword(s):  
Laser Ablation ◽  
Metal Cutting ◽  
Medical Engineering ◽  
Machining Process ◽  
Micro Machining ◽  
Promising Alternative ◽  
Laser Induced Plasma ◽  
Direct Laser ◽  
Micro Features ◽  
Machining Characteristics

Presently surface micro-texturing has found many promising applications in the fields of tribology, bio-medical engineering, metal cutting, and other functional or topographical surfaces. Most of these applications are material-specific, which necessitates the need for a texturing and machining process that surpasses the limitations posed by a certain class of materials that are difficult to process by laser ablation, owing to their optical or other surface or bulk characteristics. Laser Induced Plasma Micromachining (LIPMM) has emerged as a promising alternative to direct laser ablation for micro-machining and micro-texturing, which offers superior machining characteristics while preserving the resolution, accuracy and tool-less nature of laser ablation. This study is aimed at understanding the capability of LIPMM process to address some of the issues faced by pulsed laser ablation in material processing. This paper experimentally demonstrates machining of optically transmissive, reflective and rough surface materials using LIPMM. Apart from this, the study includes machining of conventional metals (Nickel and Titanium) and polymer (Polyimide), to demonstrate higher obtainable depth and reduced heat affected distortion around micro-features machined by LIPMM, as compared to laser ablation.

Multimaterial Capability of Laser Induced Plasma Micromachining

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Ishan Saxena ◽  
Kornel F. Ehmann
Keyword(s):  
Laser Ablation ◽  
Biomedical Engineering ◽  
Metal Cutting ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Machining Process ◽  
Promising Alternative ◽  
Laser Induced Plasma ◽  
Direct Laser ◽  
Machining Characteristics

Presently surface microtexturing has found many promising applications in the fields of tribology, biomedical engineering, metal cutting, and other functional or topographical surfaces. Most of these applications are material-specific, which necessitates the need for a texturing and machining process that surpasses the limitations posed by a certain class of materials that are difficult to process by laser ablation, owing to their optical or other surface or bulk characteristics. Laser induced plasma micromachining (LIPMM) has emerged as a promising alternative to direct laser ablation for micromachining and microtexturing, which offers superior machining characteristics while preserving the resolution, accuracy and tool-less nature of laser ablation. This study is aimed at understanding the capability of LIPMM process to address some of the issues faced by pulsed laser ablation in material processing. This paper experimentally demonstrates machining of optically transmissive, reflective, and rough surface materials using LIPMM. Apart from this, the study includes machining of conventional metals (nickel and titanium) and polymer (polyimide), to demonstrate higher obtainable depth and reduced heat-affected distortion around microfeatures machined by LIPMM, as compared to laser ablation.

scholarly journals Short-Pulse Lasers: A Versatile Tool in Creating Novel Nano-/Micro-Structures and Compositional Analysis for Healthcare and Wellbeing Challenges

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 712
Author(s):  
Ahmed Al-Kattan ◽  
David Grojo ◽  
Christophe Drouet ◽  
Alexandros Mouskeftaras ◽  
Philippe Delaporte ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Surface Engineering ◽  
Short Pulse ◽  
Chemical Properties ◽  
Compositional Analysis ◽  
Periodic Patterns ◽  
Laser Ablation In Liquid ◽  
Micro Scale ◽  
Direct Laser ◽  
Contact Free

Driven by flexibility, precision, repeatability and eco-friendliness, laser-based technologies have attracted great interest to engineer or to analyze materials in various fields including energy, environment, biology and medicine. A major advantage of laser processing relies on the ability to directly structure matter at different scales and to prepare novel materials with unique physical and chemical properties. It is also a contact-free approach that makes it possible to work in inert or reactive liquid or gaseous environment. This leads today to a unique opportunity for designing, fabricating and even analyzing novel complex bio-systems. To illustrate this potential, in this paper, we gather our recent research on four types of laser-based methods relevant for nano-/micro-scale applications. First, we present and discuss pulsed laser ablation in liquid, exploited today for synthetizing ultraclean “bare” nanoparticles attractive for medicine and tissue engineering applications. Second, we discuss robust methods for rapid surface and bulk machining (subtractive manufacturing) at different scales by laser ablation. Among them, the microsphere-assisted laser surface engineering is detailed for its appropriateness to design structured substrates with hierarchically periodic patterns at nano-/micro-scale without chemical treatments. Third, we address the laser-induced forward transfer, a technology based on direct laser printing, to transfer and assemble a multitude of materials (additive structuring), including biological moiety without alteration of functionality. Finally, the fourth method is about chemical analysis: we present the potential of laser-induced breakdown spectroscopy, providing a unique tool for contact-free and space-resolved elemental analysis of organic materials. Overall, we present and discuss the prospect and complementarity of emerging reliable laser technologies, to address challenges in materials’ preparation relevant for the development of innovative multi-scale and multi-material platforms for bio-applications.

Pressure Waves in Microscopic Simulations of Laser Ablation Leonid

1998 ◽  
Vol 538 ◽  
Author(s):  
V. Zhigilei ◽  
Barbara J. Garrison
Keyword(s):  
Boundary Condition ◽  
Laser Ablation ◽  
Laser Energy ◽  
Scale Up ◽  
Boundary Region ◽  
Dynamics Simulation ◽  
Pressure Waves ◽  
Absorption Region ◽  
Organic Solids ◽  
Direct Laser

AbstractLaser ablation of organic solids is a complex collective phenomenon that includes processes occurring at different length and time scales. A mesoscopic breathing sphere model developed recently for molecular dynamics simulation of laser ablation and damage of organic solids has significantly expanded the length-scale (up to hundreds of nanometers) and the time-scale (up to nanoseconds) of the simulations. The laser induced buildup of a high pressure within the absorbing volume and generation of the pressure waves propagating from the absorption region poses an additional challenge for molecular-level simulation. A new dynamic boundary condition is developed to minimize the effects of the reflection of the wave from the boundary of the computational cell. The boundary condition accounts for the laser induced pressure wave propagation as well as the direct laser energy deposition in the boundary region.

CORROSION PROTECTION OF ELECTROLESS PLATING Ni-P INCLUDING TiN NANOPARTICLES FOR BIPOLAR PLATES OF PEMFCs

2018 ◽  
Vol 25 (02) ◽  
pp. 1850052 ◽  
Author(s):  
GAO PINGPING ◽  
OUYANG CHUN ◽  
XIE ZHIYONG ◽  
TAO TAO
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Electroless Plating ◽  
Shell Structure ◽  
Compact Surface ◽  
Proton Exchange ◽  
Core Shell ◽  
Tin Coating ◽  
Sem Images ◽  
Core Shell Structure

The Ni-P/TiN coating was used as bipolar plate by electroless plating on Ti. Surface morphology and phase structure of the coatings were characterized by SEM and XRD, respectively. Corrosion resistance of Ni-P and Ni-P/TiN coating was measured in the simulated solution of Proton exchange membrane fuel cells (PEMFCs). The interfacial contact resistance (ICR) was conducted by applied different forces. SEM images indicated that the particles of core–shell structure were formed on the surface of coating on Ti substrate. The core–shell structure was composed of TiN core and Ni-P electroless plating shell. Compared with Ni-P coatings, the Ni-P/TiN coating showed better corrosion resistance behaviors and low ICR (below 10[Formula: see text]m[Formula: see text][Formula: see text] cm[Formula: see text] under pressure of 200 N/cm[Formula: see text]. TiN particles and distribution of core–shell were in favor of the formation of coating and compact surface morphology. The good conductivity was attributed to the compact surface morphology of coating. The Ni-P/TiN coating showed excellent interfacial conductivity and good corrosion resistance at applied high potential in simulated solution of PEMFCs.

Preparation of Electrodeposited Ni-CNTs Nanocomposite Coatings with Highly Wear and Corrosion Resistance Properties

2012 ◽  
Vol 548 ◽  
pp. 101-104 ◽  
Author(s):  
W. Shao ◽  
D. Nabb ◽  
N. Renevier ◽  
I. Sherrington ◽  
J.K. Luo
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Corrosion Property ◽  
Nanocomposite Coatings ◽  
Sem Images ◽  
Wear And Corrosion ◽  
Watts Bath ◽  
Wear And Corrosion Resistance

Ni-carbon nanotubes nanocomposite coatings were obtained from a Watts bath containing uniformly dispersed carbon nanotubes (CNTs). The surface morphology was investigated by the SEM images of coatings. The mechanical property and corrosion resistance of the nanocomposite coatings were investigated. This study revealed these CNTs reinforced Ni nanocoatings have improved mechanical and corrosion property.

SCnS Linear Chain Production by Direct Laser Ablation

2003 ◽  
Vol 107 (45) ◽  
pp. 9547-9553 ◽  
Author(s):  
Andrei Burnin ◽  
Joseph J. BelBruno
Keyword(s):  
Laser Ablation ◽  
Linear Chain ◽  
Direct Laser

scholarly journals Characterization by TGA, SEM, and EDX of Polymeric Matrices Used as Cocaine Camouflages

2018 ◽  
Vol 12 (12) ◽  
pp. 119
Author(s):  
Carlos A. Díaz V ◽  
William F. Garzón M ◽  
Juan C. Higuita V ◽  
Elisabeth. Restrepo-Parra
Keyword(s):  
Surface Morphology ◽  
Thermo Gravimetric Analysis ◽  
Soxhlet Extraction ◽  
Structural Type ◽  
Extraction Process ◽  
Gravimetric Analysis ◽  
Before And After ◽  
The Matrix ◽  
Morphological Differences ◽  
Almost All

In this work, a study of samples that contained cocaine camouflaged inside unidentified polymers was performed. Samples were seized at the Dorado International airport in Colombia. Cocaine was adsorbed or occluded within the matrix. The objective of this research was to extract cocaine from the matrices using soxhlet extraction method. Thereafter matrices were analyzed to determine the surface morphology before and after the extraction. Several morphological differences were exhibited between samples including both adsorbed and occluded cocaine. Moreover, changes in the surface morphology were also observed before and after cocaine extraction. The chemical elemental composition of matrices was also studied using energy dispersive spectroscopy, observing that the alkaloid was totally removed in almost all samples after the extraction process. On the other hand, Thermo gravimetric analysis also allows comparing the results obtained for the samples with patterns of pure cocaine and other polymers as CMC, PVA and HEC, finding several similarities of structural type.

Sign in / Sign up

Export Citation Format

Share Document