Adaptability of piston skirt coatings on the tribological performance of heavy-duty diesel engine under low viscosity lubricant

Abstract

Purpose The purpose of this paper was to improve the frictional wear resistance properties of piston skirts caused by the low viscosity lubricant by studying the tribological performance of three novel coating materials. Design/methodology/approach Comparative tribological examinations were performed in a tribological tester using the ring-block arrangement under two viscosity lubricants, the loading force was applied as 100 N, the speed was set to 60 r/min and the testing time was 180 min. Findings Under low viscosity lubricant, the friction coefficient and wear of the three coatings all increase, and the friction coefficient and wear of the PTFE coating are the largest, while the MoS2 coating has the lowest friction coefficient and wear. Under low viscosity lubricant, the friction coefficient of the MoS2 coating is 2.1%–5.4% and 20.0%–24.3% lower than that of the SiO2 and PTFE coating, respectively. The friction coefficient and wear fluctuation rate of the MoS2 coating is the smallest when the lubricant viscosity decreases, which indicates that the MoS2 coating has excellent stability and adaptability under low viscosity lubricant. Originality/value To reduce the piston skirt wear caused by low viscosity lubricant in heavy-duty diesel engines, the friction and wear adaptability of three novel composite coating materials for piston skirts were compared under 0 W-20 low viscosity lubricant, which could provide a guidance for the application of wear-resistant materials for heavy-duty diesel engine piston skirt.

A review of advances in tribology in 2020–2021

“…Meng et al [216] and Yin et al [217] found the presence of the liquid lubricants significantly reduces the friction coefficient and the wear rate of the pure coating. Wang et al [218] prepared ultralow friction polymer composites by adding oil-loaded microcapsules into epoxy (EP) resin.…”

Comparative Analysis of Soft Computing Models for Predicting Viscosity in Diesel Engine Lubricants: An Alternative Approach to Condition Monitoring

“…11 The wear rate of the engine parts is influenced by the viscosity of the lubricant. Lowviscosity lubricants can result in an increase in the friction coefficient and wear, 12,13 while the utilization of certain additives or nanoparticles can lead to a reduction in frictional force and wear rate. 14 The investigation aims to explore alternative fuels derived from bioresources, specifically by blending palm oil with aluminum oxide nanoparticles.…”