Abstract
Laser ablation with fs laser pulses was performed in air on cobalt cemented tungsten carbide by means of a Ti : sapphire laser (800 nm, 100 fs). Small and moderate fluences (2, 5, 10 J/cm2) and up to 5×104 pulses per irradiated spot were used to drill holes with aspect ratios up to 10. Cross-section cuts from laser-irradiated samples were produced and they were analysed with optical microscopy and SEM. EDX analyses were carried out on selected zones. Quasi-cylindrical holes were found for 2 J/cm2, whereas for 5 and 10 J/cm2 irregular shapes (lobes, bottoms wider than hole entrances) were found to occur after a given number of incident pulses. Layers with modified structure were evidenced at pore walls. SEM revealed a denser structure, while EDX analyses showed uniform and almost similar contents of W, C, and Co in these layers. As a direct application, patterning of coated WC-Co was carried out with 2 J/cm2 and 100 pulses per pore. The resulted surfaces were tribologically tested and these tests revealed an improved friction and wear behaviour.
Similar content being viewed by others
References
G.S. Upadhyaya: Nature and properties of refractory carbides(Nova Science Publishers, NewYork, 1996)
D. Bleiner, A. Plotnikov, C. Vogt, K. Wetzig, D. Günther: Fresenius J. Anal. Chem. 368, 221 (2000)
T. Li, Q. Lou, J. Dong, Y. Wei, J. Liu: Appl. Phys. A 73, 391 (2001)
G. Dumitru, V. Romano, H.P. Weber, M. Sentis, W. Marine: Appl. Phys. A 74, 729 (2002)
G. Dumitru, V. Romano, H.P. Weber, M. Sentis, J. Hermann, S. Bruneau, W. Marine, H. Haefke, Y. Gerbig: Appl. Surf. Sci. 208, 181 (2003)
M. Hellsing: Mater. Sci. Technol. 4, 824 (1988)
J. Bech, N. Bay, M. Erkisen: Wear 232, 134 (1999)
A.E. Wynne, B.C. Stuart: Appl. Phys. A 76, 373 (2003)
D. Ashkenasi, A. Rosenfeld, H. Varel, M. Wähmer, E.E.B. Campbell: Appl. Surf. Sci. 65 120 (1997)
D. von der Linde, H. Schüler: J. Opt. Soc. Am. 13, 216 (1996)
F. Dausinger: Proc. SPIE 4830, 471 (2003)
G. Dumitru, V. Romano, H.P. Weber, H. Haefke, Y. Gerbig: Proceedings of Laser 2001 World of Photonics, München, June 2001; Subconference Lasers in Manufacturing, Editor: WLT eV, p. 351 (2001)
G. Dumitru, V. Romano, Y. Gerbig, H.P. Weber, H. Haefke: Appl. Phys. A, DOI 10.1007/s00339-003-2349-4 (2004)
Author information
Authors and Affiliations
Corresponding author
Additional information
PACS
42.65.Cs; 79.60.Ds
Rights and permissions
About this article
Cite this article
Dumitru, G., Romano, V., Weber, H. et al. Femtosecond laser ablation of cemented carbides: properties and tribological applications. Appl. Phys. A 79, 629–632 (2004). https://doi.org/10.1007/s00339-004-2675-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00339-004-2675-1