Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate

Processing of AlTiN/TiN multilayered hard coatings by femtosecond (fs) laser pulses has been investigated. Irradiation was performed in air with linearly polarized laser radiation with pulses of 200 fs duration at 775nm wavelength. Single or 1000 subsequent laser pulses were directed at normal incid...

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Bibliographic Details
Published in:Optics and laser technology 2017-03, Vol.89, p.200-207
Main Authors: Gaković, B., Petrović, S., Albu, C., Zamfirescu, M., Panjan, P., Milovanović, D., Popescu-Pelin, G., Mihailescu, I.N.
Format: Article
Language:English
Subjects:
AlTiN/TiN coating
Coating
Craters
Damage threshold
Femtosecond
Femtosecond pulses
Fluence
Irradiation
Laser ablation
Lasers
LIPSS
Nanostructure
Protective coatings
Steel
Studies
Titanium nitride
Transmission electron microscopy
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Summary:Processing of AlTiN/TiN multilayered hard coatings by femtosecond (fs) laser pulses has been investigated. Irradiation was performed in air with linearly polarized laser radiation with pulses of 200 fs duration at 775nm wavelength. Single or 1000 subsequent laser pulses were directed at normal incidence towards target surface. Laser energy per pulse was adjusted from 0.5 to 50µJ and corresponding fluence was 0.17–17.5Jcm−2. The as deposited and laser-ablated samples were characterized by optical confocal microscopy, optical profilometry and scanning and transmition electron microscopy. In case of the AlTiN/TiN coating, a single-pulse damage threshold of 0.41Jcm−2 was estimated. Well defined holes/craters with diameters from 7 to 35µm, up to 40µm depth were drilled, depending on laser pulse energy and number, after 1000 laser pulses. For small energy/fluence, laser induced periodical surface structures were observed. A model is discussed which can account for these features by the accumulation effect during multi-pulse irradiation. The forming craters can prove useful for fabrication of micron solid state lubricant reservoirs in the protective coating-steel system. •An AlTiN/TiN nano-layered hard coating on steel substrate.•Effects of single 200fs laser pulse at 775nm on the AlTiN/TiN coating.•Single fs laser pulse damage threshold of 0.41Jcm−2.•LIPSSs/ripples formation on the coating-steel system with fs laser irradiation.•Precise fs laser crater fabrication on coatings by 1000 pulses.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2016.10.015