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

Demas, Nicholaos G.; Erck, R.A.; Ajayi, O. O.; Fenske, G.R.

doi:10.1002/ls.1175

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…During operation cycle of 720 • in the ICE, the PR passes all lubrication modes on the cylinder liner and will generate different levels of friction [5]. Piston coatings have the potential to reduce friction and/or wear of the piston's sliding components [6] but also to prevent scuffing. To measure reduction in wear and friction of the PCC, two variables are considered: Loss of mass of the PR and coefficient of friction (COF) of the PCC as a function of time.…”

Section: Modeling the Friction Of The Piston-cylinder-contact During mentioning

confidence: 99%

The Influence of a Piston Ring Coating on the Wear and Friction Generated during Linear Oscillation

Rozario

Baumann²,

Shah³

2019

Lubricants

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The piston group is responsible for contributing to ~50% of the frictional losses of an engine, which ultimately leads to the waste of fuel. This coupled with the fact that gasoline is a finite resource linked to CO2-emissions, there is an increased demand of higher performance vehicles, which coincidently further loads the piston ring. As of yet, there are plenty of studies that already study the piston ring’s contact with the cylinder liner. However, this study focuses on a cost-effective Schwing, Reib, Verschleiss (SRV) instrumentation that allows to pre-screen lubricants, additives, materials and coatings for their friction, wear and load carrying capacity including scuffing resistance. As a result of the pre-screening conducted outside of engine by using the SRV instrument, it brings us to the following conclusion: the PVD CrN-TiN 1º Group coating on the piston ring produces the least wear, as well as the lowest coefficient of friction. Moreover, it is concluded that a coating that is based from CrN and TiN allows the piston ring to perform better in engine settings. A continued understanding of the piston-cylinder-contact assembly only helps engineers, scientists and any other stakeholder to improve on the piston ring and cylinder liner interaction.

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Section: Modeling the Friction Of The Piston-cylinder-contact During mentioning

confidence: 99%

The Influence of a Piston Ring Coating on the Wear and Friction Generated during Linear Oscillation

Rozario

Baumann²,

Shah³

2019

Lubricants

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“…Furthermore, the rough samples asperities accommodate more Cr debris on their surface as compared to fine samples as evident from In as is scenario case, the wear rate of Cr coated rings shows negative value due to the increase in weight after adhesion of grey cast iron debris on their surface asperities during the test. This can be explained by the fact that grey cast iron cylinder liner has the hardness (2 GPa) [24] which is much lesser as compared to TiN coated cylinder liners (shown in Table 7) which result in more wear of the uncoated cylinder liners and less wear of the rings against them. However, TiN coated ring shows negligible wear resistance against uncoated cylinder liners.…”

Section: E Coefficient Of Friction (Cof) With Respect To Coatingmentioning

confidence: 99%

Comparative Experimental Study of Tribo-Mechanical Performance of Low-Temperature PVD Based TiN Coated PRCL Systems for Diesel Engine

Uddin

Kamran

Ahmad

et al. 2018

Advances in Tribology

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Piston ring and cylinder liner (PRCL) interface is a major contributor to the overall frictional and wear losses in an IC engine. Physical vapor deposition (PVD) based ceramic coatings on liners and rings are being investigated to address these issues. High temperature requirements for applications of conventional coating systems compromise the mechanical properties of the substrate materials. In the current study, experimental investigation of tribo-mechanical properties is conducted for various titanium nitride (TiN) coated PRCL interfaces in comparison with a commercial PRCL system. Low-temperature PVD based TiN coating is successfully achieved on the grey cast iron cylinder liner samples. Surface roughness of the grey cast iron cylinder liner substrates and the thickness of TiN coating are varied. A comprehensive comparative analysis of various PRCL interfaces is presented and all the trade-offs between various mechanical and tribological performance parameters are summarized. Coating thickness between 5 and 6 micrometres reports best tribo-mechanical behaviour. Adhesion and hardness are found to be superior for the TiN coatings deposited on cylinder liner samples with higher roughness, i.e., ~ 5-micron Ra. Maximum 62 % savings on the COF is reported for a particular PRCL system. Maximum 97% saving in cylinder liner wear rate is reported for another PRCL system.

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“…Therefore, the surface of a piston ring must be multifunctional. Some coatings have already been tried at the surface of this mechanical component in order to improve the surface properties [15].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of 316L Stainless Steel Reinforced with CuCoBe + Diamond Composites by Laser Sintering and Hot Pressing: A Comparative Statistical Study

Cunha

Marques

Monteiro

et al. 2020

Computational Science and Its Applications – ICCSA 2020

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The aim of this work was to assess how the tribological properties of a laser textured 316L stainless steel reinforced with CuCoBe-diamond composites are affected by diamond particles size, type of technology (laser sintering and hot pressing) and time of tribological test. A statistical analysis using IBM® SPSS software was performed. After describing the response variables, the Friedman's test was used to compare how the coefficient of friction varied among samples in five-time points. From this test, results showed that there was no statistically significant difference in the coefficient of friction mean values over the selected time points. Then, the two-samples K-S test was used to test the effect of the diamond particles size and the type of technology on the mean of COF over time. The results showed that, for both sintering techniques, the size of the diamond particles significantly affected the values of the coefficient of friction (p-value < 0.05), whereas no statistical differences were found between the tested sintering techniques (p-value > 0.05). Also, the twoway ANOVA test was used to evaluate how these factors influence the specific wear rate, which conducted to the same conclusions drawn for the previous test. Therefore, it was concluded that the coefficient of friction and the specific wear rate were statistically affected by the diamond particles size, but not by the sintering techniques used in this work.

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

Cited by 16 publications

References 9 publications

The Influence of a Piston Ring Coating on the Wear and Friction Generated during Linear Oscillation

The Influence of a Piston Ring Coating on the Wear and Friction Generated during Linear Oscillation

Comparative Experimental Study of Tribo-Mechanical Performance of Low-Temperature PVD Based TiN Coated PRCL Systems for Diesel Engine

Tribological Behavior of 316L Stainless Steel Reinforced with CuCoBe + Diamond Composites by Laser Sintering and Hot Pressing: A Comparative Statistical Study

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