The Synergetic Effects of Surface Texturing and MoDDP Additive Applied to Ball-on-Disk Friction Subject to Both Flooded and Starved Lubrication Conditions

Bai, Linqing; Meng, Yonggang; Khan, Zulfiqar Ahmad; Zhang, Varian

doi:10.1007/s11249-017-0949-y

Cited by 20 publications

(11 citation statements)

References 34 publications

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“…In real engines, the friction pairs may suffer different working conditions, such as cold start-up and full-loaded state, which have an obvious effect on the tribological performance. Spikes 19 and Bai et al 20 found that the anti-friction function of organo-molybdenum will be lost when it worked in oxidizing environments. Some other studies have found that scuffing is directly related to high temperature, heavy load, and starved lubrication.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive experimental study on tribological performance of piston ring–cylinder liner pair

Liang

Zhai

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The tribological performance of the piston ring–cylinder liner pair is affected by multiple factors. In this study, the orthogonal test method is used to comprehensively explore the influence of oil dilution, cylinder liner surface coating, and working conditions on the friction and wear of the piston ring–cylinder liner pair. The orthogonal test results show that a certain degree of oil dilution is beneficial to the performance, so the influence of oil dilution is further investigated by using the control variable method. The results show that the liner wear depth decreases first and then increases with the increase of oil dilution. Combined with the scanning electron microscope and energy dispersive X-ray spectroscopy results, it is found that the formation of tribofilm is promoted with a small amount of oil dilution under different working conditions. Meanwhile, a diamond-like carbon (DLC) coating ring and an Fe-based coating cylinder liner can significantly improve the scuffing resistance performance of the piston ring–cylinder liner pair.

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Section: Introductionmentioning

confidence: 99%

A comprehensive experimental study on tribological performance of piston ring–cylinder liner pair

Liang

Zhai

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Another reason for reduction in wear volume when using coated specimens is due to the micro-pores that exist in Ni–Al 2 O 3 nanocomposite coatings, as shown in Figure 2; these pores help retain the liquid refrigerant, increasing the lubricity of the rubbing parts. Micro dimpled grooves and cavities in the surface have been reported to improve the tribological performance of interacting parts [82,83]. The presence of micro-pores in this case similarly helped improve the wear performance.…”

Section: Resultsmentioning

confidence: 86%

Wear Performance Analysis of Ni–Al2O3 Nanocomposite Coatings under Nonconventional Lubrication

2018

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This article presents a wear study of Ni–Al2O3 nanocomposite coatings in comparison to uncoated steel contacts under reciprocating motion. A ball-on-flat type contact configuration has been used in this study in which a reciprocating flat steel sample has been used in a coated and uncoated state against a stationary steel ball under refrigerant lubrication. The next generation of environmentally friendly refrigerant HFE-7000 has been used itself as lubricant in this study without the influence of any external lubricant. The thermodynamic applications and performance of HFE-7000 is being studied worldwide, as it is replacing the previous generation of refrigerants. No work however has been previously performed to evaluate the wear performance of HFE-7000 using nanocomposite coatings. The wear scar developed on each of the flat and ball samples was studied using a Scanning Electron Microscope (SEM). The micrographs show that a combination of adhesive and abrasive wear occurs when using uncoated steel samples. Micro-delamination is observed in the case of Ni–Al2O3 nanocomposite coatings accompanied by adhesive and abrasive wear. Wear volume of the wear track was calculated using a White Light Interferometer. Energy-Dispersive X-ray Spectroscopic (EDS) analysis of the samples reveals fluorine and oxygen on the rubbing parts when tested using coated as well as uncoated samples. The formation of these fluorinated and oxygenated tribo-films helps to reduce wear and their formation is accelerated by increasing the refrigerant temperature. Ni–Al2O3 nanocomposite coatings show good wear performance at low and high loads in comparison to uncoated contacts. At intermediate loads the coated contacts resulted in increased wear, especially at low loads. This increase in wear is associated with the delamination of the coating and the slow formation of protective surface films under these testing conditions.

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“…The ratio between composite root-mean-square (RMS) roughness and average film thickness is equal to film thickness ratio λ, this is usually used for estimating the state of lubrication within a rough point contact, so in this case, Hamrock-Dowson formula, Eq. ( 1), has been employed to compute the minimum lubricant film thickness hence hmin [34] .…”

Section: Lubrication Statementioning

confidence: 99%

Effect of Surface Topography on ZDDP Tribofilm Formation During Running-in Stage Subject to Boundary Lubrication

Bai

Meng

Zhang³

et al. 2021

Tribol Lett

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Experimental investigations have been conducted to study the effects of surface topography on ZDDP (zinc dialkyldithiophospahte) chemical tribofilm formation during runningin stage under boundary lubrication conditions. The scope of presented work has been limited and focused on reciprocating motion under boundary lubrication to simulate upper and lower dead center of piston ring movement, which is prone to adhesive wear failure. Several surface topographies were designed and fabricated to measure, compare coefficient of friction and ZDDP time critical tribofilm formation. Rubbing surfaces and their corresponding tribofilms were characterised by SEM and EDX. Mechanisms of surface topography effects on ZDDP time critical tribofilm formation is presented and discussed. Results from this study have demonstrated that the surface topography has a significant influence on the ZDDP time critical tribofilm formation during running-in process and corresponding wear performance. This research provides an opportunity to augment anti-wear performance under boundary lubrication condition. This can be achieved by optimising surface morphology design to influence the formation of anti-wear tribofilms during the running-in stage.In turn, this will result in interacting components' service life enhancement and significant cost savings from mitigated wear.

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The Synergetic Effects of Surface Texturing and MoDDP Additive Applied to Ball-on-Disk Friction Subject to Both Flooded and Starved Lubrication Conditions

Cited by 20 publications

References 34 publications

A comprehensive experimental study on tribological performance of piston ring–cylinder liner pair

A comprehensive experimental study on tribological performance of piston ring–cylinder liner pair

Wear Performance Analysis of Ni–Al2O3 Nanocomposite Coatings under Nonconventional Lubrication

Effect of Surface Topography on ZDDP Tribofilm Formation During Running-in Stage Subject to Boundary Lubrication

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