Abstract
In this study, Cr2AlC MAX phase and CoNiCrAlY substrates were prepared by spark plasma sintering (SPS) method and Yttria-stabilized zirconia (YSZ) ceramic coating was deposited on the substrates by atmospheric plasma spray (APS) technique. The hot corrosion behavior of these samples was examined at 950°C in a cyclic mode in the presence of Na2SO4+V2O5 molten salts. After each cycle, samples were evaluated by energy dispersive spectroscopy (EDS) equipped scanning electron microscopy (SEM) and x-ray diffraction (XRD) methods. According to the results, Cr2AlC/YSZ sample has better hot corrosion resistance compared to the CoNiCrAlY/YSZ system. Formation of rod shape YVO4 phase and also phase transformation during the hot corrosion are the main factors in the destruction of the YSZ top coat. According to the EDS results, the thermally grown oxide (TGO) layer in Cr2AlC/YSZ is alumina and in CoNiCrAlY/YSZ system TGO is consisted of alumina and spinel oxides. Also, it was found that the spinel oxide in CoNiCrAlY/YSZ system is porous and does not have appropriate mechanical properties compared to the dense and protective alumina layer and can be a suitable area for the interfacial cracking.
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.
