Thermal barrier coatings are used for insulation of hot components. The thermal barrier maintains the metal temperature of a coated component at moderate temperature levels during operation. These coatings prevent the material from severe creep damage and oxidation. Therefore this gives better coating integrity for a reliable assessment of coating life.

In the present work, NiAl bond coats with yttria partially stabilized zirconia top coat are studied on two different substrates (Mild steel and stainless steel) using air plasma system with 9 MB gun. Tribological and wear behavior of coatings was assessed at different temperatures to check which substrate gives better wear resistance. MS/ SS is more wear resistant when used as substrate.