Tribological properties of h-BN nanoparticles as lubricant additive on cylinder liner and piston ring

Friction and wear are the main causes of energy dissipation in automotive engines. To minimize the frictional power losses, it is extremely important to improve the tribological characteristics of ring/liner assembly which accounts for almost 40–50% frictional power losses. The present study attempts to mitigate friction and wear of the ring/liner tribo-pair using GNP/SAE 15W40 nano-lubricant. To simulate the ring/liner interface, the tribological performance of nano-lubricants was assessed using a tribometer based on ASTMG181 standard under various operating conditions. The coefficient of friction (COF) and wear rate lowered using graphene nano-lubricants (GNL). The tribological results showed that friction coefficient, wear rate, and surface roughness of piston ring improved in the range 17.71%–42.33%, 25%–40.62%, and 61%, respectively, under GNL lubricating conditions during the boundary lubrication. Further, the characterization of wear tracks of piston ring and cylinder liner confirmed tribo-film formation on worn surfaces resulting in decreased COF and wear rate.

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Effects of honed cylinder liner surface texture on tribological properties of piston ring-liner assembly in short time tests

Tribology International ◽

10.1016/j.triboint.2016.11.025 ◽

2017 ◽

Vol 113 ◽

pp. 137-148 ◽

Cited By ~ 41

Author(s):

Wieslaw Grabon ◽

Pawel Pawlus ◽

Slawomir Wos ◽

Waldemar Koszela ◽

Michal Wieczorowski

Keyword(s):

Tribological Properties ◽

Surface Texture ◽

Piston Ring ◽

Cylinder Liner ◽

Liner Surface ◽

Short Time

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TRIBOLOGICAL PERFORMANCE OF MODIFIED FLOCCULENT GRAPHITE AS LUBRICANT ADDITIVES

Surface Review and Letters ◽

10.1142/s0218625x19501087 ◽

2019 ◽

Vol 27 (02) ◽

pp. 1950108

Author(s):

CHUAN YI XUE ◽

SHOU REN WANG ◽

JIN FENG LENG ◽

YONG WANG ◽

GAO QI WANG

Keyword(s):

Friction And Wear ◽

Piston Ring ◽

Gasoline Engine ◽

Adhesive Wear ◽

Friction Pair ◽

Cylinder Liner ◽

Lubricant Additive ◽

Suspension Stability ◽

Wear Performance ◽

Friction And Wear Characteristics

In this research, graphite has been found to have excellent tribological properties as a lubricant additive. To reduce high friction and wear in cylinder liner piston ring friction pairs, modified flocculent graphite have been prepared via chemical technology. The morphology and microstructure of modified flocculent graphite were investigated via SEM, EDS, XRD and IR. In this study, varying concentrations (0.1, 0.5, and 0.9 wt.%) within modified flocculent graphite were dispersed at 350 SN lubricant for Gasoline Engine. Suspension stability of the lubricating oils with modified flocculent graphite and graphite as determined by ultraviolet-visible light (UV-VIS) spectrophotometry. The friction and wear characteristics of lubricants containing materials of modified flocculent graphite were evaluated under reciprocating test conditions to simulate contact. The morphology and microstructure of the friction pair tribofilms produced during frictional contact were investigated via SEM, EDS and a 3D surface profiler. The results show that scratching, pits, furrows and adhesive wear took place, respectively, on the worn surfaces of friction pairs. But, modified flocculent graphite showed excellent friction reducing and anti-wear performance and subsequently has great potential for the application of anti-wear.

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Piston ring and cylinder liner for IC engine

Sealing Technology ◽

10.1016/s1350-4789(09)70520-3 ◽

2009 ◽

Vol 2009 (9) ◽

pp. 15

Keyword(s):

Piston Ring ◽

Cylinder Liner ◽

Ic Engine

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A Spectrographic Sampling Method for Quick Assessment of Cylinder and Piston Ring Wear

Journal of Engineering for Industry ◽

10.1115/1.3604603 ◽

1968 ◽

Vol 90 (1) ◽

pp. 43-48

Author(s):

H. U. Wisniowski ◽

D. R. Jackson

Keyword(s):

Rapid Method ◽

Sampling Method ◽

Piston Ring ◽

Cylinder Liner ◽

Small Sample ◽

Operating Conditions ◽

Small Hole ◽

Cylinder Wall ◽

Lubricating Oils ◽

Wear Rates

A simple, inexpensive, and rapid method of assessing cylinder and piston ring wear was developed. A small sample of the oil which lubricates the cylinder wall and piston rings was drawn off through a small hole in the cylinder wall. The sample was then analyzed spectrographically. Changes in wear resulting from changes in cylinder liner materials, fuels, lubricating oils, and other operating conditions were investigated. The method was found useful especially in cases of drastic differences in the wear rates. Selected examples of these studies are reported.

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Transient Heat Transfer Simulation of the Coupling 3-D Moving Piston Assembly-Lubricant Film-Liner System

Heat Transfer, Volume 3 ◽

10.1115/imece2006-15481 ◽

2006 ◽

Cited By ~ 1

Author(s):

Liu Zhien ◽

Jiang Yankun ◽

Chen Guohua ◽

Yang Wanli

Keyword(s):

Heat Transfer ◽

Piston Ring ◽

Cylinder Liner ◽

Heat Transfer Model ◽

Lubricant Film ◽

Transient Heat Transfer ◽

Transfer Model ◽

Friction Heat ◽

Liner System ◽

Piston Assembly

Transient heat transfer model of the coupling 3-D moving piston assembly-lubricant film-liner system is successfully developed for predicting the temperature distributions in the component system of internal combustion chamber, in which the effect of the friction heat generated at the piston ring/cylinder liner interfaces has been taken into account. The finite element method (FEM) is employed in the model for establishing the heat transfer relation among the moving piston assembly-lubricant film-cylinder liner. The 3-D discrete model of the coupling system is obtained by hypothesizing the lubricant film as 1-D thermal resistances and the friction heat as heat flux boundary conditions. The allocation and distribution model of friction heat on piston ring pack and liner are also established. The 3-D coupling heat transfer model has been used to analyze the heat transfer of a gasoline engine.

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