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  4. Interplay of mechanics and chemistry governs wear of diamond-like carbon coatings interacting with ZDDP-additivated lubricants
 
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2021
Journal Article
Title

Interplay of mechanics and chemistry governs wear of diamond-like carbon coatings interacting with ZDDP-additivated lubricants

Abstract
Friction and wear reduction by diamond-like carbon (DLC) in automotive applications can be affected by zinc-dialkyldithiophosphate (ZDDP), which is widely used in engine oils. Our experiments show that DLCs tribological behaviour in ZDDP-additivated oils can be optimized by tailoring its stiffness, surface nano-topography and hydrogen content. An optimal combination of ultralow friction and negligible wear is achieved using hydrogen-free tetrahedral amorphous carbon (ta-C) with moderate hardness. Softer coatings exhibit similarly low wear and thin ZDDP-derived patchy tribofilms but higher friction. Conversely, harder ta-Cs undergo severe wear and sub-surface sulphur contamination. Contact-mechanics and quantum-chemical simulations reveal that shear combined with the high local contact pressure caused by the contact stiffness and average surface slope of hard ta-Cs favour ZDDP fragmentation and sulphur release. In absence of hydrogen, this is followed by local surface cold welding and sub-surface mechanical mixing of sulphur resulting in a decrease of yield stress and wear.
Author(s)
Salinas Ruiz, V.R.
University of Lyon, Ecole Centrale de Lyon, Laboratory of Tribology and System Dynamics, CNRS UMR5513, Ecully, France; University of Lyon, INSA-Lyon,UCBL, MATEIS UMR CNRS, Villeurbanne, France; HEF/IREIS, Avenue Benoît Fourneyron, Andrézieux-Bouthéon, France.
Kuwahara, Takuya  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Galipaud, J.
University of Lyon, Ecole Centrale de Lyon, Laboratory of Tribology and System Dynamics, CNRS UMR5513, Ecully, France; University of Lyon, INSA-Lyon,UCBL, MATEIS UMR CNRS, Villeurbanne, France
Masenelli-Varlot, K.
University of Lyon, INSA-Lyon,UCBL, MATEIS UMR CNRS, Villeurbanne, France
Ben Hassine, M.
University of Lyon, Ecole Centrale de Lyon, Laboratory of Tribology and System Dynamics, CNRS UMR5513, Ecully, France
Héau, C.
HEF/IREIS, Avenue Benoît Fourneyron, Andrézieux-Bouthéon, France.
Stoll, Melissa
Fraunhofer-Institut für Werkstoffmechanik IWM  
Mayrhofer, Leonhard
Fraunhofer-Institut für Werkstoffmechanik IWM  
Moras, Gianpietro  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Martin, J.M.
Moseler, Michael  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Barros Bouchet, M.-I. de
University of Lyon, France
Journal
Nature Communications  
Project(s)
Projekt zur Reibungs-Optimierung von Motoren durch Einsatz von triboaktiven Hochleistungskohlenstoff- sowie Eisenbasisschichten und Schmierstoffen  
Funder
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)  
Open Access
DOI
10.1038/s41467-021-24766-6
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • atomistic model

  • Chemical Physics

  • mechanical engineering

  • wear

  • diamond-like carbon

  • lubrication

  • contact mechanics

  • quantum chemistry

  • mechanochemistry

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