Abstract
Surface texturing has been shown to be an effective modification approach for improving tribological performance. This study examined the friction reduction effect generated by square dimples of different sizes and geometries. Dimples were fabricated on the surface of ASP2023 steel plates using femtosecond laser-assisted surface texturing techniques, and reciprocating sliding line contact tests were carried out on a Plint TE77 tribometer using a smooth 52100 bearing steel roller and textured ASP2023 steel plates. The tribological characterization of the friction properties indicated that the textured samples had significantly lowered the friction coefficient in both boundary (15% improvement) and mixed lubrication regimes (13% improvement). Moreover, the high data sampling rate results indicated that the dimples work as lubricant reservoirs in the boundary lubrication regime.
Highlights
Surface texturing is an approach to the modification of surfaces to form regular patterns on surfaces
It can be seen that the fitted curves for all samples (S, M and L) follow the same trend, and a frictional reduction has been achieved compared with the non-textured samples especially in the boundary lubrication regime with the largest reduction of 15%
Researchers have claimed that surface texturing could only reduce friction when features are smaller than the contact width [23], the reduction in the boundary regime is in agreement with Wakuda’s [24], who previously studied the influence of dimple size on frictional properties and suggested dimple’s size larger than contact width is beneficial for friction reduction
Summary
Surface texturing is an approach to the modification of surfaces to form regular patterns on surfaces. Surface texturing has been used to improve tribological performance, especially to reduce friction in mechanical components, such as thrust bearings [3], journal bearings [4], piston rings [5], mechanical seals [6], and bio-implants [7]. From 2002, Wang’s group conducted a series of experiments under hydrodynamic to mixed lubrication regimes with water as lubricant, and the results were summarized into a load carrying capacity map, which indicated the influence of the area ratio (the area percentage of the dimples to the total area), and the dimple depth-to-diameter ratio [10]. In 2011, a series of experiments were conducted by Qiu to examine the performance of laser surface textured circular and elliptical dimples on stainless steel rings, and it was found
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