Femtosecond ablation of ultrahard materials |
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| Authors: | G Dumitru V Romano HP Weber M Sentis W Marine |
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| Institution: | (1) Institute of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland, CH;(2) Groupement Interdisciplinaire Ablation Laser et Applications, LP3 FRE2165 CNRS – Université de la Méditerranée et GPEC UMR 6631 CNRS, Faculté des Sciences de Luminy, Case 917, 13288 Marseille Cedex 9, France, FR |
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| Abstract: | Several ultrahard materials and coatings of definite interest for tribological applications were tested with respect to their
response when irradiated with fs laser pulses. Results on cemented tungsten carbide and on titanium carbonitride are reported
for the first time and compared with outcomes of investigations on diamond and titanium nitride. The experiments were carried
out in air, in a regime of 5–8 J/cm2 fluences, using the beam of a commercial Ti:sapphire laser. The changes induced in the surface morphology were analysed with
a Nomarski optical microscope, and with SEM and AFM techniques. From the experimental data and from the calculated incident
energy density distributions, the damage and ablation threshold values were determined. As expected, the diamond showed the
highest threshold, while the cemented tungsten carbide exhibited typical values for metallic surfaces. The ablation rates
determined (under the above-mentioned experimental conditions) were in the range 0.1–0.2 μm per pulse for all the materials
investigated.
Received: 31 August 2001 / Accepted: 3 December 2001 / Published online: 20 March 2002 |
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| Keywords: | PACS: 42 62 Cf 61 80 Ba 81 40 Wx |
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