Spectroscopic ellipsometry and X-ray photoelectron comparative studies of tribofilms formed on cast iron surfaces

Miranda-Medina, M. L.; Spiller, S.; Vernes, A.; Jech, Martin

doi:10.1016/j.triboint.2016.12.021

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…It has been used to measure the thickness of surfactant monolayers on gold , and silicon , surfaces and adsorption kinetics and surface layer thicknesses in situ of many systems, such as proteins , and polymers, in aqueous systems. Ellipsometry has also been applied to quantify the thickness of a ZDDP tribofilm, as well as the thickness of DLC coatings and MoS 2 layers in air . Within a sliding contact lubricated with a base oil, ellipsometry has been used to measure in situ the oil film thickness between the two surfaces with nm accuracy .…”

Section: Experimental Methodsmentioning

confidence: 99%

Adsorption of Organic Friction Modifier Additives

et al. 2020

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Organic friction modifier additives (OFMs) are surfactant molecules added to engine oils to reduce friction in the boundary lubrication regime. They are thought to work by forming an absorbed layer which provides low friction. This paper studied the relationship between the adsorption of OFMs and their friction and wear reducing properties in a rubbing contact formed by a stationary glass ball and a rotating silicon disk under the boundary lubrication regime. The effect of molecular structure was investigated by using OFMs of various tail saturation and head group chemistry. OFM tested were oleic acid, octadecylamine, oleylamine and glycerol monooleate. The thickness of an OFM adsorbed layer in hexadecane, examined in-situ by spectroscopic ellipsometry and quartz crystal microbalance (QCM), depends on the molecular structure and the concentration of the OFM. As expected, saturated, linear chain gives the thickest film. A critical OFM layer thickness of about 0.6 nm is necessary to achieve low initial and maximum friction. The thicker OFM layers are accompanied by narrower wear tracks, which are rougher than the wider, smoother wear tracks formed with thinner OFM layers. The interplay between the thickness of the OFM layer and wear track surface roughness results in all OFM layers having similar steady friction. This shows that the apparent effect of OFM depends on the stage of rubbing test: initially on friction; and then subsequently on surface damage. 2 Despite OFMs and the base oil having similar refractive indices, ellipsometry was found to be a suitable technique for examining the adsorption of OFM additives from an oil based solution, and showed reasonable correlation with QCM results. friction coefficients at the 100 th rotation. This shows that the impact of the properties of OFM adsorbed layers extend beyond the initial friction to the subsequent surface damage.

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Section: Experimental Methodsmentioning

confidence: 99%

Adsorption of Organic Friction Modifier Additives

et al. 2020

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“…The wear of different materials can be measured parallel and continuously by using different isotopes [15]. Previous studies have shown that such a tracer method is suitable for wear studies on different materials or under various loading conditions [16], [20], [21]. Berlet et al [22] and Faller et al [23] used radio nuclide tracers for DLC wear studies and found loading condition dependent wear rates.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Wear Measurement With Radioactive Isotopes for DLC Coatings Affected by Abrasive Particles

Zellhofer

Jech

Badisch

et al. 2022

Preprint

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Diamon-like carbon (DLC) coatings protect engine parts from wear and provide low-friction. Unfortunately, the nature of DLC coatings does not allow progressing wear measurement using conventional methods. Therefore, we applied a radioactive isotope-based wear measurement method (RIC method). A tribometer with oscillating contact and one with sliding contact were used to provide different loading conditions. The RIC method was evaluated for DLC coatings, and the DLC wear was investigated regarding the presence of abrasive particles. The results indicate that an increase in abrasive particle concentration leads to an increase of DLC wear rate and a decrease in usage-time until wear-off.

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Evaluation of Wear Measurement with Radioactive Isotopes for DLC Coatings Affected by Abrasive Particles

et al. 2022

View full text Add to dashboard Cite

Diamond-like carbon (DLC) coatings protect engine parts from wear and provide low-friction. Unfortunately, the nature of DLC coatings does not allow progressing wear measurement using conventional methods. Therefore, we applied a radioactive isotope-based wear measurement method (RIC method). A tribometer with oscillating contact and one with sliding contact were used to provide different loading conditions. The RIC method was evaluated for DLC coatings, and the DLC wear was investigated regarding the presence of abrasive particles. The results indicate that an increase in abrasive particle concentration leads to an increase of DLC wear rate and a decrease in usage-time until wear-off.

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Spectroscopic ellipsometry and X-ray photoelectron comparative studies of tribofilms formed on cast iron surfaces

Cited by 4 publications

References 21 publications

Adsorption of Organic Friction Modifier Additives

Adsorption of Organic Friction Modifier Additives

Evaluation of Wear Measurement With Radioactive Isotopes for DLC Coatings Affected by Abrasive Particles

Evaluation of Wear Measurement with Radioactive Isotopes for DLC Coatings Affected by Abrasive Particles

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