Department of Mining and Metallurgy Engineering, Amirkabir University of Technology, Tehran, Iran
In some engineering fields, wear resistance and a low friction coefficient are required at the same time. In this research, PTFE nanoparticles and carbon nanotubes were co-deposited within Ni-P matrix to obtain an Ni-P-PTFE-CNT hybrid coating for wear resistance and a low friction coefficient. The tribological properties of the deposits were evaluated by pin on disc tribometer. The morphology of the coatings and worn surface was evaluated by scanning electron microscopy. However, the results showed that the addition of PTFE nanoparticles to the Ni-P electroless coating caused the friction coefficient to decrease to values lower than 0.2, which led to an improvement in friction behavior because of its self-lubricity properties; it, however, decreased the strength of coating due to polymeric and soft structure of the molecules. The simultaneous incorporation of PTFE nanoparticles and carbon nanotubes can provide the properties of both molecules and increased the strength of coating with a low friction coefficient and self-lubricity properties. Therefore, the wear rate and the degradation of surface were decreased during the wear process.