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dc.contributor.authorSun, Wenen_US
dc.contributor.authorTan, Adrian Wei Yeeen_US
dc.contributor.authorKing, Donavan Jia Yingen_US
dc.contributor.authorKhun, Nay Winen_US
dc.contributor.authorBhowmik, Ayanen_US
dc.contributor.authorMarinescu, Iulianen_US
dc.contributor.authorLiu, Erjiaen_US
dc.identifier.citationSun, W., Tan, A. W. Y., King, D. J. Y., Khun, N. W., Bhowmik, A., Marinescu, I. & Liu, E. (2020). Tribological behavior of cold sprayed Inconel 718 coatings at room and elevated temperatures. Surface and Coatings Technology, 385, 125386-.
dc.description.abstractIn this study, Inconel 718 coatings were fabricated by high pressure cold spray deposition and the microstructure and tribological properties of the coatings were systematically investigated at both room and elevated temperatures. At the first place, the investigation on the effect of thermal exposure on the surface oxidation of the coatings was conducted in the absence of sliding. It was found that oxides started to form on the coating surface when the ambient temperature was above 500 °C. At 600 °C, a NiFe2O4 spinel oxide layer spread over the coating surface. Under sliding against an Al2O3 counter ball, oxides started to form on the coating surfaces in contact with the ball when the ambient temperature was above 200 °C due to the fact that the frictional and external heat had facilitated the formation of the oxides. Thus, the friction coefficients of the Inconel 718 coatings decreased with the increase of ambient temperatures. However, the wear rates of the coatings increased at 100 °C and 200 °C compared to those of the coatings tested at room temperature, which was due to the decrease of hardness and severe abrasive wear. When the ambient temperature was further increased to 300 °C, a transition in wear mechanism occurred and the wear rates decreased due to the formation and breakage of the surface oxides that could act as lubricants between the counter ball and coating. With further increase of ambient temperature, a ‘glaze’ layer was formed and grew on the wear tracks, which could act as a protective layer and showed a load-bearing effect that prevented further removal of the coating materials, resulting in an improved wear resistance of the Inconel 718 coatings at elevated temperatures. Therefore, cold sprayed Inconel 718 coatings could be potentially used under wear conditions at elevated temperatures.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.relationARMS 1.1 Advanced Metallized Coatings using Cold Sprayen_US
dc.relation.ispartofSurface and Coatings Technologyen_US
dc.rights© 2020 Elsevier B.V. All rights reserveden_US
dc.subjectEngineering::Aeronautical engineeringen_US
dc.titleTribological behavior of cold sprayed Inconel 718 coatings at room and elevated temperaturesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.researchRolls-Royce@NTU Corporate Laben_US
dc.subject.keywordsHigh Pressure Cold Sprayen_US
dc.subject.keywordsInconel 718 Coatingen_US
dc.description.acknowledgementThis work was financially supported by the Industry Alignment Fund (IAF) of Singapore A*STAR, Rolls-Royce (RR) and Nanyang Technological University, Singapore (NTU) under the research grant: ARMS 1.1 Advanced Metallized Coatings using Cold Spray.en_US
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