Macroscale Superlurbricity in Steel – DLC contacts using 2D materials

K.C. Mutyala, O. Eryilmaz, A. Erdemir, A.V. Sumant
Argonne National Laboratory,
United States

Keywords: 2D materials, graphene, MoS2, DLC, steel contact, POD

Summary:

Ability of few atom thin 2D materials to withstand high contact pressures at the tribological interface and provide low friction and wear through easy shearing of these layers is very attractive for various industrial applications. In this study, we have explored combination of graphene and MoS2 as a solid lubricant to minimize friction and wear in steel contacts coupled with diamond-like carbon (DLC) as one of the counterface. We have carried out tribological studies in air and in dry nitrogen environments using pin-on-disc tribometer by varying load and speed. We observed an interesting trend with respect to environmental conditions in lowering the friction for extended time periods through application of a few drops of 2D materials at the tribological contacts. We have used various characterization techniques including Raman/SEM/EDS to study the evolution of lubricant layer formed within a wear track and we will discuss results to explain the possible mechanism.