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Micro-Pitting and Wear Assessment of PAO vs Mineral-Based Engine Oil Operating under Mixed Lubrication Conditions: Effects of Lambda, Roughness Lay and Sliding Direction

1
Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
2
SKF Engineering & Research Centre, 3439 MT Nieuwegein, The Netherlands
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Author to whom correspondence should be addressed.
Lubricants 2019, 7(5), 42; https://doi.org/10.3390/lubricants7050042
Received: 4 April 2019 / Revised: 26 April 2019 / Accepted: 6 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Elastohydrodynamic (EHD) Lubrication)
Under certain operating conditions, rolling contacts have been shown to experience some challenges when lubricated with engine oils containing zinc dialkyldithophosphate (ZDDP) anti-wear additive. In order to better understand the main damage mechanisms during various operating conditions, further studies are needed. This article studies micro-pitting and wear damages of bearing steel surfaces under mixed lubrication conditions in a ball-on-disc setup, lubricated with different engine oils. Based on the results, micro-pitting and wear damage is shown to be highly case-dependent. In general, PAO-based engine oil tends to eliminate micro-pitting damage compared to mineral-based engine oil at less severe lubricating conditions. Moreover, a critical lambda was found for both oils, where the highest micro-pitting damage was observed. View Full-Text
Keywords: micro-pitting; ZDDP; mild wear; surface-initiated fatigue micro-pitting; ZDDP; mild wear; surface-initiated fatigue
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MDPI and ACS Style

Vrček, A.; Hultqvist, T.; Baubet, Y.; Björling, M.; Marklund, P.; Larsson, R. Micro-Pitting and Wear Assessment of PAO vs Mineral-Based Engine Oil Operating under Mixed Lubrication Conditions: Effects of Lambda, Roughness Lay and Sliding Direction. Lubricants 2019, 7, 42.

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