Abstract
The oxidation of thermal barrier coating (TBC) specimens consisting of nickel-base superalloy, low-pressure plasma sprayed Ni–28Cr–6Al–0.4Y (wt.%) bond coatings and air plasma-sprayed 7.5 wt.% yttria stabilized zirconia top coatings was studied at 1050 °C in flows of O 2, and mixture of O 2 and 5%H 2O under atmospheric pressure. The TBC exhibits very low oxidation rate at 1050 °C in pure O 2 and the oxidation kinetics accords with parabolic law. The oxidation kinetics of TBC obeys almost linear law after long exposure times in the presence of 5% water vapor. Oxide formed along the bond coat and top coat interface after oxidation at 1050 °C in pure O 2 consisted of Al 2O 3, whereas interfacial scales formed after oxidation at 1050 °C in a mixture of O 2 and 5%H 2O were mainly composed of Ni(Al,Cr) 2O 4, NiO, Cr 2O 3 and Al 2O 3. It is suggested that the effect of water vapor on the oxidation of the NiCrAlY coating may be attributed to the increase in Ni and Cr ions transport.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
