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Effects of surface finish on the initial oxidation of HVAF-sprayed NiCoCrAlY coatings
Linköping University, Department of Management and Engineering, Linköping, SE-58183, Sweden.ORCID iD: 0000-0001-5674-6723
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
Linköping University, Department of Physics, Chemistry, and Biology, Linköping, SE-58183, Sweden.
Siemens Industrial Turbomachinery AB, Finspång, SE-61283, Sweden.
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 364, p. 43-56Article in journal (Refereed) Published
Abstract [en]

Oxide scale formed on HVAF-sprayed NiCoCrAlY coatings and the effect of surface treatment were investigated by a multi-approach study combining photo-stimulated luminescence, microstructural observation and mass gain. The initial oxidationbehaviour of as-sprayed, polished and shot-peened coatings at 1000 °C is studied. Both polished and shot-peened coatings exhibited superior performance due to rapid formation of α-Al2O3 fully covering the coating and suppressing the growth of transient alumina, assisted by a high density of α-Al2O3 nuclei on surface treatment induced defects. Moreover, the fast development of a two-layer alumina scale consisting of an inward-grown inner α-Al2O3 layer and an outer layer transformed from outward-grown transient alumina resulted in a higher oxide growth rate of the as-sprayed coating.

Place, publisher, year, edition, pages
2019. Vol. 364, p. 43-56
Keywords [en]
Oxidation, Transient to alpha transformation, Surface treatment, Polishing, Shot-peening, Photo-stimulated luminescence spectroscopy
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-13736DOI: 10.1016/j.surfcoat.2019.02.068ISI: 000463302800006Scopus ID: 2-s2.0-85062231529OAI: oai:DiVA.org:hv-13736DiVA, id: diva2:1297915
Funder
Swedish Energy Agency, KME-703Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-07-01Bibliographically approved

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Sadeghi, EsmaeilMarkocsan, NicolaieJoshi, Shrikant V.

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Zhang, PiminSadeghi, EsmaeilMarkocsan, NicolaieJoshi, Shrikant V.
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Manufacturing, Surface and Joining Technology

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