Abstract
Thermal cyclic tests of ZrO 28wt.%Y 2O 3/Co32Ni21Cr6A10.5Y duplex thermal barrier coatings (TBCs) were conducted from room temperature to 1000, 1025, 1050, 1075 and 1100°C. Failure analyses of all spalled specimens were carried out to elucidate the degradation mechanism of the TBCs. It was found that the decrease in cyclic life of TBCs is most dramatic when the temperature is increased from 1000 to 1025°C. Specimen geometry has a large influence on the cyclic life of TBCs. The critical weight gain at failure of TBCs is different for specimens tested at various temperatures. An unexpected minimum in specific weight gain at failure was observed at 1075°C. Spalling of the ceramic overlayer appears to propagate along the ceramic overlayer-bond coat scale interfacial region and a spalling mechanism for the ZrO 28wt.% Y 2P 3 ceramic overlayer is proposed according to the results obtained in this study.
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.
