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  • Training period subject 2020 – CEMEF Lubricating properties of solid nanoparticles used as oil additives

    Advanced Materials
    Required :

    Training period subject 2020 – CEMEF

     

    TITLE

    Lubricating properties of solid nanoparticles used as oil additives

    Context

    Friction is estimated to cause up to 25 % energy consumption and ~75% of failure (global). Oils and greases used today are formulated with molecular additives, causing some toxicity issues and other limitations, depending on operating temperature, etc.  

    In this internship project, we propose to investigate and to test a new family of additives, characterized by their solid nature and their nanoparticle size.

    In the past decade, a rising interest in these solid nanoparticle (NPs) additives has come along with a significant development of the synthesis techniques of nano-objects with various shapes and nature (metallic, oxide, carbides, etc.). Their tribological properties depend on a variety of parameters, such as their intrinsic characteristics and size but also their encapsulation (capping layer), concentration, stability in a base oil, contact surface, load, temperature etc.

     bibliography :

    ·    Lahouij, I., et al., IF-MoS2 based lubricants: influence of size, shape and crystal structure. Wear, 296, (2012) 558-567.

    ·    Tannous, J., et al., Understanding the tribochemical mechanisms of IF-MoS2 nanoparticles under boundary lubrication. Tribology Letters, 41(2010) 55-64.

    ·    Lahouij, I., et al., Nano-additives enabled advanced lubricants. US Patent Application Publication, US 2018/0127676 A1.

    Objectives

    The objectives of this work consist in a tribological study of the lubricating properties (friction and wear) of different systems of nanoparticles synthesized by IMRA Europe (Inorganic Fullerene-like NPs such as MoS2, metallic NPs, etc.) in order to identify the parameters (composition, structure, size, dispersion, etc.) which provide optimal tribological performances.

    The tribological tests include using experimental instruments of Tribometer-type. Then in order to identify the action mechanisms of the nanoparticles in a frictional contact, post-tribometry analysis include using surface analysis tools like: optical and electronic microscopes (SEM, TEM), compositional analysis (EDS, XPS), structural analysis (DRX, etc.)

    Keywords

    Tribometry, lubrication, friction, surface analysis

    Profile/ Skills

    ·   Master 2, Bac + 5, Engineer (PFE)

    ·   Materials ; A first introduction to Tribology would be a « plus »

    ·   Interest in experimentation and mechanical measurements

    ·   Rigor and ability to embrace a subject – Team work is required.

    Partnership

    This work will be conducted mainly in the group “Pôle Surface et Procédés” (PSP) at CEMEF, a Research Center of Mines ParisTech I PSL Université associé au CNRS (Unité Mixte de Recherche CNRS, UMR7635) located in the Sophia-Antipolis technopole. (http://www.cemef.mines-paristech.fr/).

    Note that CEMEF and IMRA Europe are about 1 km close to each other.

    Place, duration

    CEMEF, av. C Daunesse, 06904 Sophia Antipolis, for ~ 4 to 6 months, from March April 2020.

    Indemnity

    600-1000 euros / month (gross)

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