The influence of laser-patterned surfaces on the frictional behavior under dry and lubricated sliding conditions

摘要

Friction and wear play a decisive role in technological and biological systems. For many years, a lot of research groups have sought to understand the origin of friction and to enhance the tribological performance of rubbing surfaces. In this context, the ability to tailor friction on different scales is of utmost importance. Laser surface texturing (LST) has shown to be a very promising technique to create surface modifications with feature sizes in the micrometer range. Direct laser interference patterning (DLIP), which is a possible approach of LST, is used to produce a well-defined surface topography with line- or cross-like patterns in order to improve the tribological performance under different lubricated conditions. In the tribological community, it is well accepted that surface patterns can produce an additional hydrodynamic pressure thus leading to an enhanced load-carrying capacity under hydrodynamic lubrication. Furthermore, these surfaces can trap wear particles or act as a secondary oil source thus improving the tribological performance under boundary and mixed lubrication.