https://cyberleninka.org/article/n/544115.pdf

Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings

Efficiency of laser surface texturing in the reduction of friction under mixed lubrication

Surface Texturing in Machine Elements − A Critical Discussion for Rolling and Sliding Contacts

Three different microstructures with line pattern, grid pattern, and spot pattern were fabricated on titanium surfaces by nanosecond laser. Scanning electron microscopy (SEM), contact angle measurement, surface roughness gage, and X-ray photoelectron spectroscopy (XPS) analyses were used to characterize and measure the surface morphology, contact angle, surface roughness, and chemical composition of titanium after laser processing. The results indicate that the contact angle of titanium surface is 77.8° immediately after laser processing, which shows hydrophilicity, and the contact angle presents a rising tendency with time in general. At steady state, the maximum contact angles for line pattern, grid pattern, and spot pattern increased to 157.2°, 153°, and 132.5°, respectively. It can be found that the surface wettability has changed from hydrophilicity to hydrophobicity and even to superhydrophobicity. The influence of surface morphology on the surface wettability effects immediately after laser treatment and does not change with time, while the effect of surface chemical composition on the surface wettability will continue from the beginning of laser processing to the stabilization of surface chemical composition. Finally, it can be deduced that the accumulation of carbon on the surface is probably the critical factor to improve the surface hydrophobicity. Therefore, it is concluded that laser-induced modification of surface wettability correlates with surface morphology and surface chemical composition.

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Modification of wettability property of titanium by laser texturing

Wettability modification of laser-fabricated hierarchical surface structures in Ti-6Al-4V titanium alloy

Anisotropic wettability of laser micro-grooved SiC surfaces

Improving hydrophobicity of laser textured SiC surface with micro-square convexes

Wettability of laser micro-circle-dimpled SiC surfaces

Thermo-hydrodynamic characteristics of spiral groove gas face seals operating at low pressure

Geometric and distribution effects of inclined dimples on the friction and wear performance of a textured surface were experimentally investigated. The frictional coefficients and face temperatures of four different kinds of elliptical surfaces were measured under various conditions of rotation speed, load, and viscosity. Experimental results showed that distribution parameters significantly affected frictional performance. From the experiments it was found that surfaces with double-row elliptical dimples have smaller frictional coefficients and lower face temperatures than that of the single-row elliptical dimples and had a 59% decrease in frictional coefficient and a 58% decrease in face temperature rise. This means that double-row elliptical dimples can lead to a more profound hydrodynamic effect as well as possess a lower chance of surface contact and wear. Moreover, a larger dimple diameter and slender ratio further improved the frictional performance of the textured surface with double-row elliptica...

Shaoxian Bai

Papers

Anisotropic wettability of laser micro-grooved SiC surfaces

Improving hydrophobicity of laser textured SiC surface with micro-square convexes

Wettability of laser micro-circle-dimpled SiC surfaces

Thermo-hydrodynamic characteristics of spiral groove gas face seals operating at low pressure

Frictional Performance of a Textured Surface with Elliptical Dimples: Geometric and Distribution Effects