Coordinated test‐rig and ToF‐SIMS experiments to investigate the influence of phosphate glass layers on the friction behavior of a wet clutch

Mayer, Christoph Oliver; Lipinsky, D.; Wohlleber, F.; Pflaum, Hermann; Stahl, Karsten; Arlinghaus, Heinrich F.

doi:10.1002/sia.5610

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The main focus of applications is on trace element analysis, the determination of lateral distributions of atoms and molecules on the surface, and the analysis of the composition of boundary layers using depth profiling. Due to this, ToF-SIMS is ideally suited for the analysis of tribologically built-up boundary layers, including the adsorptive layer formed from oil additive components, and to advance the understanding of the interaction of all materials involved [27][28][29][30][31].…”

Section: Time-of-flight Secondary Ion Mass Spectrometrymentioning

confidence: 99%

Nano- and Micro-Tribological Investigations of Boundary Layers on Axial Bearing Washers Tested under WEC Critical Conditions

Pape

2022

Lubricants

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The formation of boundary layers on bearing surfaces due to the operational conditions has a significant influence on bearing lifetimes and frictional properties. Zinc dialkyldithiophosphate is an anti-wear additive widely used in oil and grease formulations that forms beneficial surface boundary layers. Under certain circumstances, this additive can cause early bearing failure due to white etching cracks (WEC) formation. By influencing chemical reactions and diffusion processes, the boundary films are suspected to be a reason for the emergence of WECs. The properties of these layers under WEC critical and uncritical conditions are of interest. To gain knowledge of these layers, nano- and micro-tribological tests were performed. One possibility is to measure the hardness by nanoindentation and scratching on and into the layers by nano scratch tests. Another way is to perform local resolved micro-pin-on-disk tests. Additionally, ToF-SIMS (Time-of-Flight Secondary Ion Mass Spectrometry) was performed on the bearing surfaces to conclude the chemical compositions of the boundary layers. In the focus was, if the measured properties of the layers can be correlated to the bearing’s early failures due to WEC, frictional properties of the whole system, and the wear on the surfaces.

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Section: Time-of-flight Secondary Ion Mass Spectrometrymentioning

confidence: 99%

Nano- and Micro-Tribological Investigations of Boundary Layers on Axial Bearing Washers Tested under WEC Critical Conditions

Pape

2022

Lubricants

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“…Phosphorus–oxygen compounds are mainly responsible for the formation of wear protection boundary layers on surfaces by oil blended with ZDDP (Mayer et al , 2014). Therefore, the ionic liquids used here were created using an anion consisting of PO 2 -(bis(2,4,4-trimethylpentyl)phosphinate [BTMPP]) or PO 4 (bis(2-ethylhexyl)phosphate [DEHP])-compounds with different hydrocarbon chains and the cation trihexyltetradecylphosphonium [P66614].…”

Section: Model Fluidsmentioning

confidence: 99%

“…The structure and chemical composition of boundary layers built under tribological stress affect the friction and wear of solid-state surfaces in a major way (Mayer et al , 2014). Therefore, information about the chemical composition of the outermost surface and boundary layer are of great importance.…”

Section: Introductionmentioning

confidence: 99%

ToF-SIMS analysis of boundary layers formed under zinc-free antiwear

Mallach

Pape

Lipinsky

et al. 2020

ILT

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Purpose The structure and chemical composition of boundary layers built under tribological stress affect the friction and wear of solid-state surfaces in a major way. Therefore, information about the chemical composition of the outermost surface and boundary layer are of great importance. Preliminary time of flight secondary ion mass spectrometry (ToF-SIMS) investigations have shown that metal surfaces that have been immersed at high temperatures in phosphonium phosphate-containing oils contain at least some characteristic signals for phosphate containing anti-wear layers. The purpose of this work is to investigate the influence of additive concentration and oil temperature on the formation of phosphate containing layers. Design/methodology/approach To investigate the formation of phosphate containing layers as a function of temperature, samples of rolling bearing steel 100Cr6 were first heated in a furnace to selected temperatures of 200, 300, 400 and 500 °C, respectively. Then, they were immersed in a model fluid containing ionic liquids as additive in PAO-2 and analysed by ToF-SIMS. Findings 100Cr6 surfaces immersed in trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate additive oil show characteristic signals of phosphate-like layers at temperatures of 400-500 °C. In addition, characteristic surface signals show a decrease in these ionic liquids at these temperatures. Originality/value Ionic liquids could be an alternative to zinc dialkyldithiophosphates as an oil additive. Targeted investigations under friction load could provide information on whether wear-reducing layers are formed. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0436

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Analyse tribologischer Schichten mit der Flugzeit-Sekundärionenmassenspektrometrie (ToF-SIMS) – Additiveinflüsse auf das Reibungsverhalten nasslaufender Lamellenkupplungen

Stockinger

Mühlenstrodt

Voelkel

et al. 2019

Forsch Ingenieurwes

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Coordinated test‐rig and ToF‐SIMS experiments to investigate the influence of phosphate glass layers on the friction behavior of a wet clutch

Cited by 6 publications

References 7 publications

Nano- and Micro-Tribological Investigations of Boundary Layers on Axial Bearing Washers Tested under WEC Critical Conditions

Nano- and Micro-Tribological Investigations of Boundary Layers on Axial Bearing Washers Tested under WEC Critical Conditions

ToF-SIMS analysis of boundary layers formed under zinc-free antiwear

Analyse tribologischer Schichten mit der Flugzeit-Sekundärionenmassenspektrometrie (ToF-SIMS) – Additiveinflüsse auf das Reibungsverhalten nasslaufender Lamellenkupplungen

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