Articolo in rivista, 2014, ENG, 10.1016/j.triboint.2014.03.014

Minimize friction of lubricated laser-microtextured-surfaces by tuning microholes depth

Scaraggi, Michele; Mezzapesa, Francesco P.; Carbone, Giuseppe; Ancona, Antonio; Sorgente, Donato; Lugara, Pietro Mario

DII, Universitá del Salento, 73100 Monteroni-Lecce, Italy CNR-IFN UOS Bari, via Amendola 173, 70126 Bari, Italy Department of Mechanics, Mathematics and Management, Politecnico di Bari, V.le Japigia 182,70126 Bari,Italy Dipartimento Interateneo di Fisica, Universitá degli Studi di Bari, via Amendola 173, 70126 Bari, Italy

We have investigated the friction properties of lubricated laser micro-textured surfaces. The micro-texture consists of a square lattice of micro-holes whose diameter, depth and spacing are controlled during the laser texturing process. All surfaces have the same texture area density, but different diameters and depths of the micro-holes. We measure the coefficient of friction on a range of sliding velocities from the mixed lubrication regime to the hydrodynamic regime. We find that the depth and the diameter of the micro-holes have a huge influence in determining the amount of friction reduction at the interface. Interestingly experiments also show that optimal micro-hole depth values, minimizing the friction in the hydrodynamic regime, are remarkably effective also in the mixed lubrication regime. (C) 2014 Elsevier Ltd. All rights reserved.

Tribology international 75 , pp. 123–127

Keywords

Surface texturing, Laser ablation, Friction, Lubrication

CNR authors

Mezzapesa Francesco Paolo, Lugara Pietro Mario, Sorgente Donato, Ancona Antonio

CNR institutes

IFN – IFN - Sede secondaria di Bari