Abstract:In order to enhance the surface friction performance of the aluminum-silicon (Al-Si) alloy cylinder liner, chemical etching and laser finishing techniques are applied to improve the friction performance. The cylinder liner samples are worn against a Cr-Al2O3 coated piston ring by a reciprocating sliding tribotester. The friction coefficient and weight loss are measured to determine the friction performance; a stress contact model is developed to ascertain the wear mechanism. The results show that the optimal e… Show more
“…By modification of surfaces which are in direct contact with anti-friction coatings or by use of composite materials, we can resolve the problems related to hardness and friction and wear of aluminum parts [20][21][22][23].…”
Applying new technologies to reduce friction and wear in vehicles and equipment can minimize mechanical losses. This reduces power loss in internal combustion engines and reduces fuel consumption and emissions. Consumption of fuel energy can be reduced by the use of light metals, for example aluminum alloy, to produce vehicles and their aggregates and parts. In this case, the problem is poor tribological properties of those light weight metals, as well as the lower strength compared to the cast iron construction. For tribology research purposes, the contact surface of the aluminum cylinder of an experimental piston air compressor is reinforced with inserts of cast iron. The results of tribology research of the composite material are presented in the paper, explaining how parameters such as the sliding speed, contact time and contact area influence friction and wear of the material in relative tribological contacts, under constant normal force. The test procedures were performed on the ball-on-plate CSM ® nanotribometer, in linear reciprocating sliding conditions with no lubricant. Material composition of the samples was determined using the Energy-Dispersive Spectroscopy. All measurements were realized at the Faculty of Engineering, University of Kragujevac.
“…By modification of surfaces which are in direct contact with anti-friction coatings or by use of composite materials, we can resolve the problems related to hardness and friction and wear of aluminum parts [20][21][22][23].…”
Applying new technologies to reduce friction and wear in vehicles and equipment can minimize mechanical losses. This reduces power loss in internal combustion engines and reduces fuel consumption and emissions. Consumption of fuel energy can be reduced by the use of light metals, for example aluminum alloy, to produce vehicles and their aggregates and parts. In this case, the problem is poor tribological properties of those light weight metals, as well as the lower strength compared to the cast iron construction. For tribology research purposes, the contact surface of the aluminum cylinder of an experimental piston air compressor is reinforced with inserts of cast iron. The results of tribology research of the composite material are presented in the paper, explaining how parameters such as the sliding speed, contact time and contact area influence friction and wear of the material in relative tribological contacts, under constant normal force. The test procedures were performed on the ball-on-plate CSM ® nanotribometer, in linear reciprocating sliding conditions with no lubricant. Material composition of the samples was determined using the Energy-Dispersive Spectroscopy. All measurements were realized at the Faculty of Engineering, University of Kragujevac.
“…58 Such wear debris formation promotes lubrication along the sliding interface and effectively limits the shootup of adhesive wear. 59 Scanning electron microscope analysis of worn surfaces at lower -15 N and higher -55 N load conditions of as-cast and thermal treated FGMMC specimens are performed. Morphology of outer layer of as-cast FGMMC at 15 N reveals (Figure 15(a)) features like co-axial sliding marks along the wear direction.…”
Section: Reciprocating Wear Testingmentioning
confidence: 99%
“…58 Such wear debris formation promotes lubrication along the sliding interface and effectively limits the shoot-up of adhesive wear. 59 Figure 13.Effect of load on (a) rate of wear and (b) co-efficient of friction.Figure 14.(a) Scanning electron microscope image and (b) EDS analysis of wear debris.…”
Tribology and mechanical properties of thermal treated Al-9Si/10wt%SiC functionally graded composite are compared with as-cast condition. The composite was centrifugally cast as a hollow cylindrical component (Ø(outer) 100 × Ø(inner) 60 × 100 mm), characterized at three wall layers (up to 3, 10, and 18 mm) from the outer periphery. Metallographic analysis on as-cast composite and thermal treated components revealed graded structure and spheroidization of acicular Si, respectively. Elemental mapping and phase formations were confirmed through Energy-dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD) analysis. Outer layer of thermal treated component revealed maximum improvement in hardness (26%) and tensile strength (15%) compared to as-cast. Brittle mode of failure was featured through fractography. A combination of adhesive and abrasive mechanisms were predominant during reciprocating wear. EDS analysis of wear debris formed at intermediate sliding distance (1250 m) confirmed the oxide layer formation. Thus, the thermal treated composites are developed for automotive engine components vulnerable to wear.
“…Silicon is harder than Al, which could enhance the wear resistance of cylinder. Therefore, many scholars take some measures to raise the silicon particles above the surface of Al–Si alloy to improve the bearing capacity and reduce the friction (Alves et al , 2022; Du et al , 2019; Akgul and Simsir, 2021). Proper processing of Al–Si alloy cylinder liners to raise silicon particles seems necessary.…”
Purpose
The purpose of this study is to prolong the service life of the Al–Si alloy cylinder and achieve the objective of energy saving and emission reduction by the composite treatments.
Design/methodology/approach
Chemical etching + laser texturing + filled MoS2 composite treatment was applied to the friction surface of aluminum–silicon (Al–Si) alloy cylinder. The friction coefficient and wear loss were measured to characterize the tribology property of cylinders.
Findings
The composite-treated Al–Si alloy cylinder had the lowest friction coefficient and weight loss. The friction coefficient and weight loss of the composite treatment were approximately 27.08% and 54.17% lower than those of the untreated sample, respectively. The laser micro-textures control the release of solid lubricant to the interface of friction pairs slowly, which prolongs the service life of cylinders.
Originality/value
The synergistic effect of the chemical etching + laser texturing + filled MoS2 modified the tribology properties of Al–Si alloy cylinder. The chemical etching raised the silicon particles to bear the load, and laser micro-textures control the release of solid lubricant to improve the lubrication property.
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