Effect of Thermal Treatment on Nano-Crystallites and Phase Transformation of CaZrO3Thermal Barrier Coatings
Thermal barrier coatings (TBCs) are multilayered coatings having the complex structure. In thermal spray coatings characteristic features of deposited molten particle and its microstructure is very important in defining coating properties. In this work stainless steel (AISI 316) was used as substrate material on which bond coat of Ni-20Cr and top coat of CaZrO3 were deposited by air plasma spraying method. Effect of isothermal treatment on the internal microstructure structure of lamella (splat) and phase changes in CaZrO3 coating was studied. The fractured surface of coatings was investigated to observe the splat morphology. It was observed that the nanocrystallites present within the splat grew with increase in temperature. Further, the monoclinic phase was formed as function of temperature and time.
Shaheed Khan, Iftikhar us Salam and Karim Ahmed
M.B. Bhatty et al., "Effect of Thermal Treatment on Nano-Crystallites and Phase Transformation of CaZrO3Thermal Barrier Coatings", Key Engineering Materials, Vols. 510-511, pp. 364-370, 2012