Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating
| Autor: | C. Radu, Bojan B. Radak, Ion N. Mihailescu, Sandra Petrović, Marian Zamfirescu, Milan S. Trtica, Peter Panjan, Biljana M. Gaković, J. Stasic |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Hard coatings femtosecond laser ablation chemistry.chemical_element Titanium aluminum nitride (TiAlN) 02 engineering and technology Nitride engineering.material 01 natural sciences Fluence law.invention Coating law 0103 physical sciences Materials Chemistry Composite material 010302 applied physics Metallurgy Surfaces and Interfaces General Chemistry Alumina (Al2O3) 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Surfaces Coatings and Films chemistry Sapphire engineering Surface modification Selective layer removal 0210 nano-technology Layer (electronics) Titanium |
| Zdroj: | Surface and Coatings Technology |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2012.06.021 |
| Popis: | We studied surface modification of a double layer protective coating on steel induced by single fs laser pulse irradiation in ambient air. The outer alumina (Al2O3) layer, which protects against aggressive environments, was 1.7 mu m thick and the titanium aluminum nitride (TiAlN) layer in contact with the steel surface had a thickness of 1.9 mu m. The pulses (lambda=775 nm, tau=200 fs) were generated by a Ti:sapphire laser source. The pulse energy was varied from 0.32 mu J to 50 mu J, corresponding to an incident laser fluence of 0.11 J cm(-2) to 16.47 J cm(-2). The surface damage threshold was found to be 0.20 J cm(-2) and the alumina layer removal was initiated at 0.56 J cm(-2). This selective ablation of alumina was possible in a wide range of fluences, up to the maximum applied, without ablating the TiAlN layer beneath. (C) 2012 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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