Submicrometer surface shaping and surface repair of metals via laser ablation

2021 ◽  
Vol 33 (4) ◽  
pp. 042049
Author(s):  
Zachary Gavin ◽  
Andrew Forsman ◽  
Jason Barrios ◽  
Grant Schrader
Keyword(s):  
Laser Ablation ◽  
Surface Shaping ◽  
Surface Repair

Friction and wear behavior of Al–Si alloy cylinder liner prepared by surface shaping treatments

2020 ◽  
Vol 234 (9) ◽  
pp. 1522-1529
Author(s):  
Cheng-Di Li ◽  
Xiao Chen ◽  
Xiao-Wei Zhang ◽  
Shun-Jian Xu ◽  
Yao Hu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Chemical Etching ◽  
Friction And Wear ◽  
Piston Ring ◽  
Wear Behavior ◽  
Cylinder Liner ◽  
Friction And Wear Behavior ◽  
Surface Shaping ◽  
The One ◽  
Silicon Particles

In order to improve the friction and wear behavior of Al–Si alloy cylinder liner, the surfaces of cylinder liner samples were prepared by three kinds of surface shaping treatments (chemical etching shaping, mechanical honing shaping, and laser ablation shaping). All the three kinds of surface shaping treatments can expose the silicon particles on the surface of Al–Si alloy cylinder liner, which prevents the contact aluminum from the counterface (piston ring). The area between the two protruding silicon particles can be stored for enhanced lubrication and reduce friction. These shaping surfaces were different. The edges of the silicon particles are made sharp by the chemical etching shaping treatment. The edges of the silicon particles are round but with burr by the mechanical honing shaping treatment. The edges of silicon particles are round but without burr by the laser ablation shaping treatment. The friction coefficient and weight loss are lowest by the laser ablation shaping in three kinds of surface shaping treatments. There are two reasons. On the one hand, the edges of silicon particles are round but without burr, which reduce the stress concentration. On the other hand, the silicon particles combine well with aluminum, which reduce the probability of falling off.

Observations on the growth of YBa2Cu3O7-δ thin films on MgO by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 1068-1069
Author(s):  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Substrate Surface ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Ablation Process ◽  
Deposition Parameters

Pulsed-laser ablation has been widely used to produce high-quality thin films of YBa2Cu3O7-δ on a range of substrate materials. The nonequilibrium nature of the process allows congruent deposition of oxides with complex stoichiometrics. In the high power density regime produced by the UV excimer lasers the ablated species includes a mixture of neutral atoms, molecules and ions. All these species play an important role in thin-film deposition. However, changes in the deposition parameters have been shown to affect the microstructure of thin YBa2Cu3O7-δ films. The formation of metastable configurations is possible because at the low substrate temperatures used, only shortrange rearrangement on the substrate surface can occur. The parameters associated directly with the laser ablation process, those determining the nature of the process, e g. thermal or nonthermal volatilization, have been classified as ‘primary parameters'. Other parameters may also affect the microstructure of the thin film. In this paper, the effects of these ‘secondary parameters' on the microstructure of YBa2Cu3O7-δ films will be discussed. Examples of 'secondary parameters' include the substrate temperature and the oxygen partial pressure during deposition.

153: Successful Gold Nanoshell Assisted Laser Ablation of Prostate Carcinoma in Vitro

2007 ◽  
Vol 177 (4S) ◽  
pp. 52-52
Author(s):  
Joshua M. Stem ◽  
Jer-Tsang Hsieh ◽  
Sangtae Park ◽  
Yair Lotan ◽  
Jeffrey A. Cadeddu
Keyword(s):  
Laser Ablation ◽  
Prostate Carcinoma ◽  
Gold Nanoshell

ENDOSCOPIC SUBMUCOSAL LASER ABLATION FOR THE TREATMENT OF TYPE 2 DIABETES – PRELIMINARY FIRST IN HUMAN STUDY RESULTS

2019 ◽  
Author(s):  
M Benes ◽  
I Marcovitch ◽  
M Mraz ◽  
A Herschkovitz ◽  
M Haluzik
Keyword(s):  
Type 2 Diabetes ◽  
Laser Ablation ◽  
Human Study ◽  
Study Results

Possibilities of using the Colibri system for endovenous laser ablation

2020 ◽  
Vol 26 (2) ◽  
pp. 103
Author(s):  
D. A. Borsuk ◽  
A. A. Fokin
Keyword(s):  
Laser Ablation ◽  
Endovenous Laser Ablation
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