HVOF sprayed Ni3Ti and Ni3Ti+(Cr3C2+20NiCr) coatings: Microstructure, microhardness and oxidation behaviour

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dc.contributor.authorReddy, N.C.
dc.contributor.authorKumar, B.S.A.
dc.contributor.authorReddappa, H.N.
dc.contributor.authorRamesh, M.R.
dc.contributor.authorKoppad, P.G.
dc.contributor.authorKord, S.
dc.date.accessioned2026-02-05T09:31:30Z
dc.date.issued2018
dc.description.abstractThis paper reports the development of Ni<inf>3</inf>Ti and Ni<inf>3</inf>Ti+(Cr<inf>3</inf>C<inf>2</inf>+20NiCr) coatings on AISI 420 stainless steel (MDN-420) and titanium alloy ASTM B265 (Ti-15) by HVOF technique. Microstructure, microhardness and high temperature oxidation behaviour of coatings were investigated. Microstructure of coatings was dense and displayed layers depicting lamellar structure. The microhardness of coatings was significantly higher than that of substrate owing to higher density and cohesive strength between individual splats of coating materials. Cyclic oxidation studies conducted on Ni<inf>3</inf>Ti and Ni<inf>3</inf>Ti+(Cr<inf>3</inf>C<inf>2</inf>+20NiCr) coatings showed oxide scale was composed of various oxides like NiO, NiCr<inf>2</inf>O<inf>4</inf> and Cr<inf>2</inf>O<inf>3</inf> phases. The formation of compact and protective NiO phase in case of Ni<inf>3</inf>Ti coatings; NiO and Cr<inf>2</inf>O<inf>3</inf> phases in Ni<inf>3</inf>Ti+(Cr<inf>3</inf>C<inf>2</inf>+20NiCr) coatings stabilised the weight gain exhibited slow oxidation rate at higher temperatures. © 2017 Elsevier B.V.
dc.identifier.citationJournal of Alloys and Compounds, 2018, 736, , pp. 236-245
dc.identifier.issn9258388
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2017.11.131
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/25213
dc.publisherElsevier Ltd
dc.subjectAlloy steel
dc.subjectBinary alloys
dc.subjectChromium alloys
dc.subjectChromium compounds
dc.subjectCoatings
dc.subjectElectron microscopy
dc.subjectFuels
dc.subjectHardness
dc.subjectHVOF thermal spraying
dc.subjectLamellar structures
dc.subjectMicrohardness
dc.subjectMicrostructure
dc.subjectNickel compounds
dc.subjectOxidation
dc.subjectScale (deposits)
dc.subjectSprayed coatings
dc.subjectStainless steel
dc.subjectThermooxidation
dc.subjectTitanium alloys
dc.subjectTitanium compounds
dc.subjectX ray diffraction
dc.subjectCoating material
dc.subjectCohesive strength
dc.subjectCyclic oxidation
dc.subjectHigh temperature
dc.subjectHigh velocity oxy fuel
dc.subjectOxidation behaviours
dc.subjectSlow oxidation
dc.subjectWeight gain
dc.subjectNickel alloys
dc.titleHVOF sprayed Ni3Ti and Ni3Ti+(Cr3C2+20NiCr) coatings: Microstructure, microhardness and oxidation behaviour

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