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.
Highlights
Mechanical components, and in particular hydraulic components, are often subject to sliding contacts and high contact pressure, which cause several failure modes such as delamination, seizure, noise, vibrations, and fatigue crack due to friction and wear [1,2,3].The efficiency improvement in piston pumps and motors is one of the most important goals in the development of these machines [4,5]
It should be noted that very high loads have been chosen, compared to the loads generally used in the literature, to simulate the severe contact conditions to which the rotating parts of the axial piston pumps are subjected in conditions of poor lubrication
In order to increase the efficiency of components that work under reciprocating sliding, the application of the surface texture on an antifriction coating used in the automotive
Summary
The efficiency improvement in piston pumps and motors is one of the most important goals in the development of these machines [4,5]. Transmission) power split [6]. The reduction in both friction and wear is very important to ensure high efficiency and extension of the component life. The problem of friction and wear is dealt with by using lubricants, but in some cases such as a low rotation speed, lubrication is insufficient. For this reason, we use coatings capable of guaranteeing dry lubrication, for example lead bronze [7,8,9]. Solid lubricants such as lead are being decommissioned because of their toxicity
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