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dc.contributor.authorNithin, H.S.
dc.contributor.authorVijay, D.
dc.contributor.authorRamesh, M.R.
dc.date.accessioned2020-03-31T08:22:46Z-
dc.date.available2020-03-31T08:22:46Z-
dc.date.issued2018
dc.identifier.citationJournal of Failure Analysis and Prevention, 2018, Vol.18, 5, pp.1133-1142en_US
dc.identifier.urihttp://idr.nitk.ac.in/jspui/handle/123456789/10568-
dc.description.abstractComponents in energy-producing systems suffer a variety of degradation processes such as oxidation and molten salt-induced corrosion as a consequence of complex multi-component gaseous environment. Coatings provide a composition that will grow the protective scale at high temperatures having long-term stability. Plasma spraying was used to deposit CoCrAlY + WC-Co composite coatings on turbine alloys of Hastelloy X and AISI 321. The thermocyclic oxidation behavior of coated alloys was investigated in static air and in molten salt (Na2SO4-60%V2O5) environment at 700 C. The thermogravimetric technique was used to approximate the kinetics of oxidation in 50 cycles, each cycle consisting of heating and cooling. X-ray diffraction and SEM/EDAX techniques are used to characterize the oxide scale formed. Coated alloys showed a lower corrosion rate as compared to uncoated alloys. The coatings subjected to oxidation and hot corrosion showed slow scale growth kinetics. Preferential oxidation of Co, Cr, W and its spinel blocks the transport of oxygen and corrosive species into the coating by providing a barrier, thereby making the oxidation rate to reach steady state. As compared to the substrate alloys, coatings show better hot corrosion resistance. 2018, ASM International.en_US
dc.titleCyclic Oxidation and Hot Corrosion Behavior of Plasma-Sprayed CoCrAlY + WC-Co Coating on Turbine Alloysen_US
dc.typeArticleen_US
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