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Hot corrosion behavior of multi-layer suspension plasma sprayed Gd2Zr2O7/YSZ thermal barrier coatings
Linkoping University, Department of Manangement and Engineering,Linkoping, Sweden.
Linkoping University, Department of Manangement and Engineering,Linkoping, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2475-9284
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
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2017 (English)In: InterCeram: International Ceramic Review, ISSN 0020-5214, Vol. 66, no 5, p. 180-184Article in journal (Refereed) Published
Abstract [en]

This study investigates the corrosion resistance of double layer Gd2Zr2O7/YSZ, triple layer dense Gd2Zr2O7 / Gd2Zr2O7/YSZ and a reference single layer YSZ coating with a similar overall top coat thickness of 300-320 Όm. All the coatings were manufactured by suspension plasma spraying (SPS), resulting in a columnar structure. Corrosion tests were conducted at 900°C for 8 hours using vanadium pentoxide and sodium sulphate as corrosive salts at a concentration of 4 mg/cm2. SEM investigations after the corrosion tests show that Gd2Zr2O7 coatings exhibited lower corrosion resistance than the reference material, YSZ. Reaction between the corrosive salts and Gd2Zr2O7 results in the formation of gadolinium vanadate ( GdVO4) along the top surface and between the columns. While the stresses due to phase transformation of zirconia can be relieved to some extent by realigning of the columns in the top coat, it is believed that GdVO4 formation between the columns, along with low fracture toughness of Gd2Zr2O7 had resulted in lower corrosion resistance. Furthermore, the presence of a relatively dense layer of Gd2Zr2O7 on the top, as a preventive layer for salt infiltration, did not improve the corrosion resistance.

Place, publisher, year, edition, pages
Expert Fachmedien GmbH , 2017. Vol. 66, no 5, p. 180-184
Keywords [en]
Atmospheric corrosion; Coatings; Corrosion; Corrosion resistance; Fracture toughness; Gadolinium; Plasma jets; Plasma spraying; Salts; Scanning electron microscopy; Sodium sulfate; Sprayed coatings; Sulfur compounds; Thermal barrier coatings; Thermal spraying; Vanadium; Vanadium compounds; Yttria stabilized zirconia; Zirconia; Zirconium compounds, Columnar structures; Corrosion tests; Gadolinium vanadates; Gadolinium zirconate; Hot corrosion; Reference material; Suspension plasma spraying; Vanadium pentoxide, Gadolinium compounds
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11915Scopus ID: 2-s2.0-85032961424OAI: oai:DiVA.org:hv-11915DiVA, id: diva2:1165746
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2018-11-13Bibliographically approved

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Mahade, SatyapalMarkocsan, NicolaieNylén, PerBjörklund, Stefan

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