Engine Studies of Solid Film Lubricant Coated Pistons

Rao, V. D. N.; Kabat, D. M.; Yeager, David A.; Lizotte, Brian

doi:10.4271/970009

Cited by 20 publications

(9 citation statements)

References 3 publications

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“…[1][2][3] Improved tribological characteristics have been achieved by coating the piston. [4][5][6] Studies have focused both on the piston ring-cylinder liner interface and piston skirtcylinder interface. However, somewhat limited experimental work has been done on coated piston skirts in laboratory conditions simulating closely the conditions found inside the engine.…”

Section: Introductionmentioning

confidence: 99%

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Tribological studies of coated pistons sliding against cylinder liners under laboratory test conditions

Demas

Erck

Ajayi

et al. 2012

Lubrication Science

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The presence of coatings and surface topography play an important role in the tribological performance of sliding components. Depending on the coating used, it is possible to reduce friction and/or reduce wear. However, although there may be low friction and wear‐resistant coatings suitable for use in pistons, some coatings may hinder the tribological performance by changing the lubrication regime or by preventing additives from their intended function through chemical mechanisms. In this work, piston skirt segments extracted from a commercial aluminium alloy piston were coated with a diamond‐like carbon (DLC) coating, a graphite–resin coating or a nickel–polytetrafluoroethylene (Ni–PTFE) coating and were tribologically tested using a reciprocating laboratory test rig against commercial grey cast iron liner segments. The tribological tests used commercial synthetic motor oil at a temperature of 120 °C with a 20 mm stroke length at a reciprocating frequency of 2 Hz. Results showed that the graphite–resin coating, although it may serve as a good break‐in coating, wears rapidly. The Ni–PTFE coating showed friction reduction, whereas the DLC coating wore off quickly due to its small thickness. Furthermore, the higher hardness of the DLC coating relative to the cast iron liner surface led to pronounced changes on the liner counterface by polishing. In contrast with the uncoated piston skirt segments, all of the coatings prevented the formation of a visible tribochemical film on the cast iron surface. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

“…It has been shown that the piston skirt contribution to the total friction losses of the piston–cylinder system is substantial . Improved tribological characteristics have been achieved by coating the piston . Studies have focused both on the piston ring–cylinder liner interface and piston skirt–cylinder interface.…”

Section: Introductionmentioning

confidence: 99%

Tribological studies of coated pistons sliding against cylinder liners under laboratory test conditions

Demas

Erck

Ajayi

et al. 2012

Lubrication Science

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show abstract

“…Different types of ferrous-based powders, containing C, Si, Sn, Ni, Cr, Mo, Cu, Ti, V and B, etc., are also employed to coat Al alloys for diesel engine applications [4]. Atmospheric plasma spray "APS" and Laser Surface Engineering "LSE" are extensively used for thermal barrier coating of nickel based super alloys component of aero and gas turbine engine components [39,40].…”

Section: Deposition Processmentioning

confidence: 99%

The Use of Electrochemical Noise in the Study of Nanometric Coatings

Gaona-Tiburcio¹,

López-Cázares²,

Miramontes³

et al. 2014

Modern Electrochemical Methods in Nano, Surface and Corrosion Science

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“…Understanding of piston skirt-friction is important for reducing friction. The friction between piston skirt and cylinder, considered as hydrodynamic in the past can be also boundary or mixed [1][2][3][4][5]. Balakrishnan et al [3] present a detailed analysis of the conforming contact between a piston and cylinder liner in a high-speed racing engine under extreme operating conditions (high loads and operating speeds).…”

Section: Introductionmentioning

confidence: 99%

Piston skirt surface topography modelling during a low wear process

Krzyzak¹,

Pawlus

2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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Piston skirt surface topographies during a low wear process were analysed. The tendencies of parameter changes were studied. It was found that during the wear process one-directional random structures were superimposed on the machined piston skirt surface topographies. On the basis of this observation, a method of piston skirt surface topography modelling during engine operating was proposed. Piston skirt axial two-dimensional (2D) profiles and 3D surface topographies were simulated. The imposition of a computer-generated random surface with a Gaussian ordinate distribution on the machined piston skirt surface is the idea of the proposed method. The worn piston surface could be modelled when its maximum height was known. The obtained results of this modelling type were compared with a simple truncation model. The matching criteria of real and simulated surface topographies were presented with the results of the model accuracy assessment.

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Engine Studies of Solid Film Lubricant Coated Pistons

Cited by 20 publications

References 3 publications

Tribological studies of coated pistons sliding against cylinder liners under laboratory test conditions

Tribological studies of coated pistons sliding against cylinder liners under laboratory test conditions

The Use of Electrochemical Noise in the Study of Nanometric Coatings

Piston skirt surface topography modelling during a low wear process

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