Abstract
Laser surface texturing is an interesting possibility to tailor materials’ surfaces and thus to improve the friction and wear properties if proper texture feature sizes are selected. In this research work, stainless steel surfaces were laser textured by two different laser techniques, i.e., the direct laser interference patterning by using a nanosecond pulsed Nd:YAG laser and additionally by an ultrashort pulsed femtosecond Ti:Sa. The as-textured surfaces were then studied regarding their frictional response in a specially designed linear reciprocating test rig under lubricated conditions with a fully formulated 15W40 oil. Results show that dimples with smaller diameter lead to a significant reduction in the coefficient of friction compared to the dimples with a larger diameter and surfaces with a grid-like surface pattern produced by direct laser interference patterning.
Highlights
Efficient energy is a major and consistently growing concern within all industrial sectors, as well as in the entire society, due to reduced resources and pollution-related issues [1,2]
Approximately one-third of the energy resources of the world are consumed just to overcome friction between mechanical components [3].‘This is especially the case for Internal Combustion Engines (ICEs), in which friction in the piston-crank mechanism is responsible for 50–70% of internal mechanical losses [4,5,6]
Tribology plays a key role in optimizing the function of mechanical assemblies by adjusting friction and wear between contacting components undergoing relative motion
Summary
Efficient energy is a major and consistently growing concern within all industrial sectors, as well as in the entire society, due to reduced resources and pollution-related issues [1,2]. This work was followed by an experimental model [25] showing that the spherical dimple shape can be further improved and that a certain ratio of dimple depth over dimple diameter can be achieved to maximize the tribological efficiency of laser-textured seal rings tested under oil lubricated contact. Surface texturing on various forms and shapes is still being extensively investigated for tribological applications by several research groups worldwide Most of these works are experimental in nature and are based on the idea that enhancing tribological performance of textured surfaces may be attributed to enhanced retention of lubricant in the micro-cavities, which provide micro-traps to capture wear debris. The present study aims at investigating the effect of smaller dimple sizes on the friction of textured surfaces when tested under oil-lubricated conditions. This finding suggests a new concept of surface texturing using materials whose wear-rates are very limited, such as ceramics
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