Solublization Effect on Nano-h-BN Performance in New Lubricant Generation
Journal Title: Biomedical Journal of Scientific & Technical Research (BJSTR) - Year 2018, Vol 6, Issue 3
Abstract
h-BN nanoparticles when added to hydrocarbona base oil alone exhibit low friction and low wear-reducing abilities. In automotive oil the dispersantis one of the additives and participates in solubilization of h-BN nano-particles. Also, solubilization will reduce adhesion of h-BN particles on the steel surfaces. Low dispersant concentrations under control are required for a new generation of automotive oils. Some nano-particles especially with lamellar structure (h-BN, WS2, MoS2) added to base oil have shown very good lubrication properties especially low friction [1,2]. Nanoparticles have a tendency to agglomerate and should be dispersed in presence of dispersant. In automotive lubricant dispersant is always present as additive. When nano-h-BN is added to commercial oil we can expect dispersion h-BN particles with involvement of reverse micelles formed by surfactants and such process is named solubilization. Micellar solubilization is the process of incorporating the h-BN particles into core of micelles. Solubilization process can be called deactivation of h-BN lubricant particles. In severe boundary lubrication condition [3] and under high contact pressures micelles with the solubilizate nano-h-BN nanoparticles have been shown to exfoliate in the contact, leading to the release of additive h-BN [3] (Figure 1). These h-BN platelets then adhere to the steel surface, resulting into thin layers formation. To design automotive new generation oil based on nanoparticles additives some technical issues should be resolved: a) Concentration of nano-additive and surfactant b) A proper dispersion and stability of the nanoparticles c) Proper evaluation friction and wear parameter. In this work we study two lubricants a) Formulated oil Selector contained surfactant with h-BN and Hydrorafinat b) Tribological pair: porous sinter (iron + h-BN)/grey cast irondisc in hydrocarbon oil without surfactant.
Authors and Affiliations
Aleksandra Mrela, Zenon Pawlak, Wieslaw Urbaniak
Keywords
Related Articles
- EP ID EP585727
- DOI 10.26717/BJSTR.2018.06.001361
- Views 144
- Downloads 0
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