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Engineered architectures of gadolinium zirconate based thermal barrier coatings subjected to hot corrosion test
University of West, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Treibacher Ind AG, Austria.
Siemens Ind Turbomachinery AB, Sweden.
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 328, 361-370 p.Article in journal (Refereed) Published
Abstract [en]

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 degrees 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. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 328, 361-370 p.
Keyword [en]
Gadolinium zirconate; Hot corrosion; Suspension plasma spray; Columnar microstructure
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:liu:diva-142965DOI: 10.1016/j.surfcoat.2017.09.005ISI: 000413376900040Scopus ID: 2-s2.0-85028920767OAI: oai:DiVA.org:liu-142965DiVA: diva2:1156505
Note

Funding Agencies|KK Foundation, Sweden [Dnr: 20140130]; AForsk foundation, Sweden [16-799]

Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2017-11-29Bibliographically approved

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Jonnalagadda, Krisha Praveen

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