Abstract:
Two metallic powders namely Ni-20Cr and Ni3Al were coated on AISI 309 SS steel by shrouded plasma
spray process. The wear behavior of the bare, Ni-20Cr and Ni3Al-coated AISI 309 SS steel was investigated
according to ASTM Standard G99-03 on a Pin-on-Disc Wear Test Rig. The wear tests were
carried out at normal loads of 30 and 50 N with a sliding velocity of 1 m/s. Cumulative wear rate and
coefficient of friction (l) were calculated for all the cases. The worn-out surfaces were then examined by
scanning electron microscopy analysis. Both the as-sprayed coatings exhibited typical splat morphology.
The XRD analysis indicated the formation of Ni phase for the Ni-20Cr coating and Ni3Al phase for the
Ni3Al coating. It has been concluded that the plasma-sprayed Ni-20Cr and Ni3Al coatings can be useful
to reduce the wear rate of AISI 309 SS steel. The coatings were found to be adherent to the substrate
steel during the wear tests. The plasma-sprayed Ni3Al coating has been recommended as a better choice
to reduce the wear of AISI 309 SS steel, in comparison with the Ni-20Cr coating.
