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Isothermal oxidation behavior of HVAF-sprayed NiCoCrAlY coatings: Effect of surface treatment
Department of Management and Engineering, Linköping University, Linköping, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
Department of Management and Engineering, Linköping University, Linköping, Sweden.
Siemens Industrial Turbomachinery AB, Finspång, Sweden.
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2017 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

NiCoCrAlY coatings are widely used as bond coats for ceramic thermal barrier coatings (TBCs) andoxidation and corrosion protective overlay coatings in industrial gas turbines. High temperature oxidation behaviour of NiCoCrAlYs has a great influence on the coating performance and lifetime of TBCs. A promising route to decrease the oxidation rate of such coatings is post-coating surface modification which can facilitate formation of a uniform alumina scale with a considerably slower growth rate compared to the as-sprayed coatings. In this work, the effect of surface treatment by means of shot peening and laser surface melting (LSM) on the oxidation resistance of high velocity air-fuel (HVAF) sprayed NiCoCrAlY coatings was studied. Isothermal oxidation was carried out at 1000⁰C for 1000h. Results showed that the rough surface of as-sprayed HVAF sprayed coatings was significantly changed after shot peening and LSM treatment, with a compact and smooth appearance. After the exposure, the oxide scales formed on surface-treated NiCoCrAlY coatings showed different morphology and growth rate compared to those formed on as-sprayed coating surface. The oxidation behaviour of surface treated HVAF-sprayed NiCoCrAlY coatings were revealed and discussed.

Place, publisher, year, edition, pages
2017. p. 1-6
Keywords [en]
Surface treatment, shot peening, Laser Surface Melting (LSM), High Velocity Air-Fuel (HVAF), NiCoCrAlY coating
National Category
Manufacturing, Surface and Joining Technology Ceramics
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11956OAI: oai:DiVA.org:hv-11956DiVA, id: diva2:1169604
Conference
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Available from: 2017-12-28 Created: 2017-12-28 Last updated: 2017-12-28Bibliographically approved

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieJoshi, Shrikant

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