Wear behaviour of different nano particles coating on Al6061 substrate

The tribological behaviour of Ni-based composite coatings on Al6061 substrate with secondary phase hard oxide particles like ZrO₂, TiO₂, and Al₂O₃ at different elevated temperature conditions was compared. The composite coatings with different reinforcement of nano particles were characterized by scanning electron microscopy and X-ray diffraction technique. The higher microhardness value is reported for the Ni coating with TiO₂ particles and Al₂O₃ particles. At higher temperature limits of 120°C and 140°C Ni–ZrO₂ coatings have found better specific wear rate. The Ni–Al₂O₃–TiO₂–ZrO₂ composite coating fails to achieve better properties due to higher agglomeration of the particles and dendrite growth. The Ni–Al₂O₃ coating showed steady wear behaviour at different temperature limits. The coefficient of friction values is found nearly similar for all the type coatings at 40°C and 120°C.