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Friction with Colloidal Lubrication

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Fundamentals of Friction: Macroscopic and Microscopic Processes

Part of the book series: NATO ASI Series ((NSSE,volume 220))

Abstract

The paper concerns boundary lubrication in the regime of mild wear.

The understanding of friction processes has greatly advanced as a result of combining contact mechanics with more detailed studies of the lubricant substances present at interface and the rheology of thin films.

We analyze the different physicochemical processes induced by lubricants, the principles of the formation of friction films, and we look for the relevant mechanical properties of the friction films.

New experimental techniques are described for measuring both the static and dynamic interactions of very thin lubricant films between two very smooth surfaces as they are moved normally or laterally relative to each other. A large range of the contact pressure range is studied, from 104 to 3. 109 Pa.

The lubricant analysed here is a colloidal suspension of overbased calcium carbonate stabilised in pure dodecane. Using first a surface force apparatus, we have observed the squeeze effect and the frictional resistance of the colloidal suspension using a sphere and plane geometry at nanometric scale. The compaction of an adsorbed layer composed of colloidal particles is responsible for the different values of the tangential force, and particularly for the friction instabilities. Secondly, using other tribometers that can support heavy loading, we have analyzed the high domain of pressure. The common feature of the experiments is that, after a critical pressure of ≈ 106 Pa, the colloidal particles do not flow within the film at the interface, but form a compacted “mattress” between the two surfaces. Sliding now takes place between solid surface and this compacted film, via a squeezed hydrocarbon layer. The mean shear strength of the interface can then be expressed by a relation of the form: τ = τ0 + α p , where p is the mean contact pressure.

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Author information

Authors and Affiliations

  1. Laboratoire de Tribologie et Dynamique des Systemes U.A. C.N.R.S. 855, Ecole Cenirale De Lyon, 36, rue Guy de Collongues, Ecully, 69130, France

    Jean-Marie Georges, Denis Mazuyer, Jean-Luc Loubet & Andre Tonck

Authors
  1. Jean-Marie Georges
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  2. Denis Mazuyer
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  3. Jean-Luc Loubet
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  4. Andre Tonck
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Editor information

Editors and Affiliations

  1. Tribology Section — Code 6170, U.S. Naval Research Laboratory, Washington, DC, USA

    I. L. Singer

  2. School of Physics and Materials, University of Lancaster, Lancaster, UK

    H. M. Pollock

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© 1992 Springer Science+Business Media Dordrecht

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Georges, JM., Mazuyer, D., Loubet, JL., Tonck, A. (1992). Friction with Colloidal Lubrication. In: Singer, I.L., Pollock, H.M. (eds) Fundamentals of Friction: Macroscopic and Microscopic Processes. NATO ASI Series, vol 220. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2811-7_14

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  • DOI: https://doi.org/10.1007/978-94-011-2811-7_14

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5249-8

  • Online ISBN: 978-94-011-2811-7

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