Femtosecond laser ablation of cemented carbides: properties and tribological applications |
| |
| Authors: | Email author" target="_blank">G?DumitruEmail author V?Romano HP?Weber Y?Gerbig H?Haefke S?Bruneau J?Hermann M?Sentis |
| |
| Institution: | (1) Institute of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;(2) CSEM Swiss Centre for Electronics and Microtechnology Inc., Jaquet Droz 1, 2007 Neuchâtel, Switzerland;(3) LP3 FRE2165 CNRS–University of Marseille, Luminy, PO Box 917, 13288 Marseille, France |
| |
| 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. PACS 42.65.Cs; 79.60.Ds |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
