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Engineered architectures of gadolinium zirconate based thermal barrier coatings subjected to hot corrosion test
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2475-9284
Linköping University, Department of Management and Engineering, Linköping, Sweden.
Treibacher Industrie AG, Austria.
Siemens Industrial Turbomachinery AB, Finspång, Sweden.
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 328, p. 361-370Article in journal (Refereed) Published
Abstract [en]

Abstract Gadolinium zirconate (GZ) is considered as a promising top coat candidate for high temperature TBC applications. Suspension plasma spray has shown the capability to generate a wide range of microstructures including the desirable columnar microstructure. In this study, two different TBC architectures were deposited using the axial suspension plasma spray. The first variation was a triple layered TBC comprising of thin YSZ base layer beneath a relatively porous GZ intermediate layer and a dense GZ top layer. The second variation was a composite TBC architecture of GZ and YSZ comprising of thin YSZ base layer and GZ + YSZ top layer. Cross sectional SEM analysis of the layered and composite TBCs revealed a columnar microstructure. The porosity content of the deposited TBCs was measured using two methods (Image Analysis and Water Intrusion). The as-sprayed TBCs were exposed at 900 °C for 8 h to a corrosive salt environment consisting of a mixture of vanadium pentoxide and sodium sulfate. XRD analysis on the as-corroded TBCs top surface showed the presence of gadolinium vanadate in both the layered and the composite TBCs. SEM/EDS analysis of the top surface and the cross-section of the layered and composite TBCs after hot corrosion test revealed the infiltration of the molten salts through the columnar gaps. The composite TBC showed a lower hot corrosion induced damage compared to the layered TBC where a considerable spallation was observed.

Place, publisher, year, edition, pages
2017. Vol. 328, p. 361-370
Keywords [en]
Gadolinium zirconate, Hot corrosion, Suspension plasma spray, Columnar microstructure
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11588DOI: 10.1016/j.surfcoat.2017.09.005ISI: 000413376900040Scopus ID: 2-s2.0-85028920767OAI: oai:DiVA.org:hv-11588DiVA, id: diva2:1143095
Available from: 2017-09-20 Created: 2017-09-20 Last updated: 2018-11-13Bibliographically approved

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Mahade, SatyapalBjörklund, StefanMarkocsan, NicolaieNylén, Per

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