Investigation of the Tribological Properties of Different Textured Lead Bronze Coatings under Severe Load Conditions

Abstract

The purpose of this paper is to investigate the variation in the coefficient of friction (CoF) and also the wear in a lead bronze coating under different texture conditions. The tribological tests were performed using a tribometer with pin on disk configuration. Several kinds of textures, realised by a surface laser texturing, were tested by varying the diameter, depth, and density of the dimples under severe working conditions. The innovative aspect concerns the behaviour of the textured lead bronze coating and the lubrication conditions when the sample is subjected to extreme load conditions. Confocal microscopies and SEM (Scanning Electron Microscopy) / EDS (Energy Dispersive X-Ray Spectroscopy) analyses were performed to evaluate the texture behaviour and also the surface deterioration of the coating. The results show that the application of texture processing leads to an improvement in the tribological properties of the coating. By analysing separately the variation of the different geometric parameters of the dimples, it has been shown that the best results are obtained with a diameter of 50 μm, a density of 5%, and a depth of 5 μm.

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“…Figure 4 shows the friction coefficient, wear rate and hardness of copper layers at different solidification temperatures. Figure 4a shows the friction coefficient fluctuates in the range of 0.06-0.1 during the change of the solidification temperature from 400 • C to 900 • C, and it first decreases and then increases as the cooling temperature increases [22]. It reaches the lowest point of 0.06 at 700 • C, and the friction coefficient stabilizes after 800 • C. Figure 4b,c shows that the wear rate and hardness show an opposite trend; the wear rate gradually decreases with the increase in cooling temperature, and the hardness gradually increases.…”

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