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Phase evolution and thermophysical properties of plasma sprayed thick zirconia coatings after annealing

TitlePhase evolution and thermophysical properties of plasma sprayed thick zirconia coatings after annealing
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2010
AuthorsDi Girolamo, G., Blasi C., Pagnotta L., and Schioppa M.
JournalCeramics International
Volume36
Pagination2273-2280
ISSN02728842
KeywordsA. Plasma spraying, After-heat treatment, Aging time, Annealing, Annealing time, Atmospheric plasma spraying, Bioceramics, D. ZrO2, Heat capacities, High-temperature exposure, High-temperature sintering, In-plane direction, Isothermally annealed, Metastable phases, Partial decomposition, Phase evolutions, Plasma jets, Plasma sprayed, Plasma spraying, Plasmas, Porous microstructure, Quantitative phase analysis, Rietveld method, Sintering, Specific heat, Specific heat capacity, Sprayed coatings, Structural change, Thermal applications, Thermal barrier coatings, Thermal expansion, Thermal expansion coefficients, Thermal properties, Thermal spraying, Thermal stress, Thermo-physical property, Thickness direction, X ray diffraction, Yttria partially stabilized zirconia, Yttria stabilized zirconia, Zirconia, Zirconia coatings
Abstract

Yttria partially stabilized zirconia (YSZ) thick thermal barrier coatings were fabricated by Atmospheric Plasma Spraying (APS) and isothermally annealed at 1315 °C for different durations. The phase composition of as-sprayed and heat-treated free-standing coatings was investigated by X-ray Diffraction (XRD) and the Rietveld method was employed for quantitative phase analysis. High-temperature exposure of YSZ coatings produced the partial decomposition of metastable t′ zirconia phase and the corresponding increase in the amount of stable tetragonal t, cubic c and monoclinic m phases with increasing the aging time. The thermophysical properties of as-sprayed and annealed YSZ coatings, such as thermal expansion and heat capacity, were measured. The thermal expansion coefficient kept almost constant in-plane direction after heat treatment. Otherwise, it changed in through-thickness direction due to any structural changes and high-temperature sintering of the porous microstructure. The sintering also influenced the specific heat capacity Cp which increased with increasing the annealing time. © 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-77957699951&doi=10.1016%2fj.ceramint.2010.07.035&partnerID=40&md5=2c977d0e02852ec1d1b42a8aebc9e249
DOI10.1016/j.ceramint.2010.07.035
Citation KeyDiGirolamo20102273