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The Combined Role of Soot Aggregation and Surface Effect on the Friction of a Lubricated Contact

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Abstract

One of the considered research paths to reduce friction loss consists in optimizing the interactions between surfaces and lubricants. The latter may significantly change with the lubricant ageing. In this framework, the tribological behaviour of aged formulated lubricant is analysed for various low-speed reciprocating motions and with different nature of surfaces. This paper focuses on soot aggregate formation processes in a lubricated contact and on their correlation to friction. Although no aggregates have been observed in pure rolling conditions, pure sliding conditions may lead to the appearance of aggregates moving through the contact as a function of the nature of the surfaces. The analysis of their displacement within the contact is used to discuss their interactions with the surfaces. Moreover, we show that the velocity and the dwell time of the aggregate depend on the sliding speed. The morphology of these aggregates evolves over time, affecting friction behaviour. An additive law combining a contribution from the shear of the aggregates with another one due to the shear of a thin lubricant film surrounding the aggregate is then proposed to interpret friction origin and friction evolution with time of shear. The aggregate motion also varies with the nature of the surfaces: in particular, DLC–DLC couple reduces aggregation phenomena and maintains a low friction without apparent wear.

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Acknowledgments

The authors acknowledge IREIS Company (France) for active collaboration and fruitful discussions. The authors wish to express their appreciation to the Agence Nationale de la Recherche for partial funding via the ANR Project EcoLub 09-MAPR-0015.

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Authors and Affiliations

  1. Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513 CNRS - École Centrale de Lyon - Université de Lyon, 36 Avenue Guy de Collongue, 69134, Écully Cedex, France

    André Ernesto, Denis Mazuyer & Juliette Cayer-Barrioz

  2. IREIS, Zone Industrielle Sud, Rue Benoît Fourneyron, CS 42077, 42162, Andrézieux-Bouthéon Cedex, France

    André Ernesto

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  1. André Ernesto
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  2. Denis Mazuyer
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  3. Juliette Cayer-Barrioz
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Correspondence to Juliette Cayer-Barrioz.

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Ernesto, A., Mazuyer, D. & Cayer-Barrioz, J. The Combined Role of Soot Aggregation and Surface Effect on the Friction of a Lubricated Contact. Tribol Lett 55, 329–341 (2014). https://doi.org/10.1007/s11249-014-0365-5

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  • DOI: https://doi.org/10.1007/s11249-014-0365-5

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