Abstract
The high temperature oxidation behaviour of nanostructured Cr/Co–Al coatings on Superni-718 substrate, deposited by sputtering, has been investigated. Cyclic high temperature oxidation tests were conducted on bare and coated samples at 900°C for up to 100 cycles. The results showed that a dense scale formed on the coated samples during thermal cycling at the peak temperature of 900°C. The external scale exhibited good spallation resistance during cyclic oxidation testing. The improvement in oxide scale spallation resistance is believed to be the fine grained structure of the coating. The Cr/Co–Al coating on the superalloy substrate showed better performance of cyclic high temperature oxidation resistance due to its possession of β-CoAl phase as Al reservoir and the formation of Al2O3 and spinel phases, such as CoCr2O4 and CoAl2O4, in the scale.
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.
