Abstract
The microstructures, properties and failure analysis of certain (ZrO2-8wt.%Y2O3)/((Co, Ni)CrAlY) thermal barrier coatings (TBCs) were evaluated in relation to the thermal cycling tests at 1050 °C. It was found that the overlaying of a top coat thickness of 0.15 mm can substantially decrease the oxidation rate of bond coat when compared with top-coat-free specimen. Also, scanning electron microscopy and electron microprobe analyses of spalled TBCs revealed that irregular aggregates of bond coat out-grown (Ni, Co)(Cr, Al)2O4 spinels were attached to the bottom of the spalled top coat. These spinel phases, which were observed to grow rapidly on the surface of the bond coat out-grown Al2O3 scale, might initiate cracks and accelerate spalling of the top coat during operation.
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.
