Abstract
Abstract The spallation of ceramic coating from the bond coat is important problem for TBC systems. And the spallation is caused the oxidation and hot corrosion at the interface of ceramic layer and bond coat. In the present work oxidation and hot corrosion behavior of plasma sprayed nanostructured Al 2 O 3 /YSZ composite TBC coatings on Ni-base (IN-738LC) super alloy substrate was studied and compared to conventional YSZ. The coatings have been deposited by plasma spray method. High temperature oxidation test at 1100 °C and hot corrosion test at 1050 °C using Na 2 SO 4 and V 2 O 5 molten salts were performed on the coatings. The experimental results showed nanostructured Al 2 O 3 /YSZ composite coating had higher oxidation and hot corrosion resistance than those of the conventional YSZ coating. The microstructural analysis indicated that the growth of TGO was much less for this nanostructured Al 2 O 3 /YSZ composite coating while it reduced infiltration of both oxygen and aggressive molten salt.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
