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The tribological behaviour of Ni-based composite coatings on Al6061 substrate with secondary phase hard oxide particles like ZrO 2 , TiO 2 , and Al 2 O 3  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 TiO 2  particles and Al 2 O 3  particles. At higher temperature limits of 120°C and 140°C Ni–ZrO 2  coatings have found better specific wear rate. The Ni–Al 2 O 3 –TiO 2 –ZrO 2  composite coating fails to achieve better properties due to higher agglomeration of the particles and dendrite growth. The Ni–Al 2 O 3  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.

Wear behaviour of different nano particles coating on Al6061 substrate