Modeling of Motor Oil Containing Diamond Nanoparticle Between two Iron Abrasion Surfaces Using Molecular Dynamics Methods

In the present paper, molecular dynamics simulations of nano-wear were performed using a diamond nanoparticle with a diameter of 3 nm enclosed by two iron blocks. The whole process remained constant at 300 K and the slip velocity was selected for the upper and lower 100 m/s boundary layers. The study of the diamond lubrication mechanism shows that nanoparticles convert the sliding motion of friction surfaces into rolling motion. Based on the obtained results, the use of a diamond nanoparticle makes it possible to reduce the coefficient of friction from 0.24 to 0.05. To investigate the effect of pressure on the wear process, simulation of the wear process at constant temperature and velocity was performed under three different pressures of 350, 500, and 650 MPa. The results showed that nanoparticle does not deform under higher pressures and retain their spherical shape and improve the friction by creating a distance between the surfaces of friction compared to when there are no nanoparticles. However, in the presence of nanoparticles, the coefficient of friction increased with increasing pressure.