Study on Wear Mechanism and Contact Temperature against Dry Sliding Wear of Ni-Al₂O₃ Nanocomposite Coating

ABSTRACT

Dry sliding wear experiments were carried out at constant normal load and sliding speed on electrodeposited Ni and Ni-α-nano Al₂O₃ coatings. The coating surfaces were worn against EN-32 HRc hardened steel in pin-on-disc test rig. The work was concentrated on the pin temperature, frictional force and specific wear rate of the coating which were measured as the function of sliding distance. The Ni coating was reported with lower frictional force and pin temperature in comparison with Ni-Al₂O₃ composite coating. Specific wear rate of the coating with nanoparticles was found to be lower than that of without particles in the Ni matrix. Pure abrasive nature of wear was reported for Ni-Al₂O₃ composite coating. This resulted in higher pin temperature for the composite coating with nanoparticles. The lower specific wear rate of Ni-Al₂O₃ is attributed to the hard nature of nanoparticles and resistance to thermal plastic deformation by the coating. Characterization of the coating was carried out by SEM, EDS, XRD analysis.

GRAPHICAL ABSTRACT

Keywords:

• Nanocomposite coating
• Dry sliding wear
• Light metal
• Pin temperature
• Friction