The effect of porous substrate on the tribological performance of a MoS2 based coating in fretting by statistical analysis

In this study, six factors (including the porous substrate, contact configuration, coating position, coating thickness, contact force and displacement amplitude) are selected. The factorial analysis is used to give a quantitative description for the contribution of each factor on the tribological performance of the coating. The porous substrate can effectively improve the coating lifetime under cylinder-on-flat configuration, while it has no significant effect on the friction coefficient. Friction coefficient is always dependent on the contact pressure. With the increase of contact pressure, the friction coefficient is decreased. When the coating is only 10 μm, coating on spherical surface can effectively improve the coating lifetime for non-porous surface. Besides, it proves that the Weibull distribution can be used as an effective way to distinguish the different wear mode.