Tribological improvement of using ionic liquids and nanoparticles as oil additives
Journal: Society of Tribologists and Lubrication Engineers Annual Meeting and Exhibition 2010
The effectiveness of ionic liquids and nanoparticles as oil additives in the lubrication of steel-steel was studied. The additivation of a polyalphaolefin (PAO6) with Zn0 and ZrO2 nanoparticles enhanced the tribological behavior of the steel/steel contact. All nanoparticle suspensions showed friction reduction compared to the base oil. A less wear in the case of Zn0 nanoparticles was also observed. The antiwear mechanism of nanoparticulate additive was produced by tribo-sintering of nanoparticles on the wear surfaces, reducing metal-to- metal contact and acting as load-bearing areas. [HMIM][BF4] and [HMIM][PF6] ionic liquids as mineral hydrocracking oil additives showed different tribological results. No significant differences in the friction behavior between M2 + [HMIM][BF4] and the pure base oil was found. [HMIM][PF6] improved the friction and antiwear properties of the base oil through the reactivity of the anion with the steel surfaces. In the case of [HMIM][BF4], FeF4 and B2O3 were found on the wear surfaces, although the amount of boron present was small. As for [HMIM][PF6], FeF3 was also identified as well as phosphorous species corresponding to P2O5 or PO43-. In both cases, although the quantity of B and P was very little, the species were found and they decreased friction and wear. This is an abstract of a paper presented at the Society of Tribologists and Lubrication Engineers Annual Meeting and Exhibition (Las Vegas, NV 5/16-20/2010).