Shifted Laser Surface Texturing (sLST) in Burst Regime

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F19%3A43956373" target="_blank" >RIV/49777513:23640/19:43956373 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11025/35987" target="_blank" >http://hdl.handle.net/11025/35987</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2961/jlmn.2019.02.0011" target="_blank" >10.2961/jlmn.2019.02.0011</a>

Result language

angličtina

Original language name

Shifted Laser Surface Texturing (sLST) in Burst Regime

Original language description

High laser-scanning speed and high precision are two opposite parameters for effective laser surface texturing (LST). Application of a sequence of laser pulses (called burst) helps to increase the processing effectivennes and speed, but precision control of laser pulses arriving becomes a difficult task for micro-texturing. In this work, one possible solution for this dilemma is presented: a scan-ning strategy called shifted laser surface texturing (sLST) in burst regime. This burst sLST repre-sents an alternative method, where the inertia of galvanoscan mirrors becomes a useful factor at higher speeds. Physical principles of laser burst interaction with a material surface and resulting subsurface thermal-stress fields are discussed. Heat accumulation was calculated from a semi-planar model of temperature distribution from laser spots in the line of the burst. Residual subsurface temperature and pressure is called positive heat accumulation in the case of minimal output roughness of laser-scanned surfaces. Experimental application of the burst sLST was performed with a pico-second laser with a galvanoscan system. Results were evaluated by newly developed shape analysis of objects detected on contrast images of laser-processed stainless steel surfaces painted with high-emissivity paint. Deviation in sLST precision was determined from larger and smaller diameters of detected microobjects on the surface with LabIR coating. The roughness of depth structure in microobjects was controlled by a contact surface profiler and compared with the goal profile and positive heat accumulation distribution. The sLST method in burst regime enables a significant increase of processing speed while maintaining good precision of the produced texture.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20506 - Coating and films

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Laser Micro Nanoengineering

ISSN

1880-0688

e-ISSN

—

Volume of the periodical

14

Issue of the periodical within the volume

2

Country of publishing house

JP - JAPAN

Number of pages

7

Pages from-to

179-185

UT code for WoS article

000486331200011

EID of the result in the Scopus database

2-s2.0-85073275564