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Structure and thermal properties of heat treated plasma sprayed ceria-yttria co-stabilized zirconia coatings

TitoloStructure and thermal properties of heat treated plasma sprayed ceria-yttria co-stabilized zirconia coatings
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2010
AutoriDi Girolamo, G., Blasi C., Schioppa M., and Tapfer Leander
RivistaCeramics International
Volume36
Paginazione961-968
ISSN02728842
Parole chiaveAnnealing, Annealing time, Atmospheric plasma spraying, Cerium compounds, Columnar grain, Corrosion protection, Crystal structure, D. ZrO, Diesel engines, Differential scanning calorimetry, Equiaxed grains, High-temperature sintering, Hot-corrosion protection, In-plane, In-plane direction, Isothermally annealed, NO phase, Out-of-plane, Out-of-plane direction, Plasma jets, Plasma sprayed, Plasma spraying, Plasmas, Sintering, Specific heat, Specific heat capacity, Sprayed coatings, Stabilized zirconia, Structure and thermal properties, Thermal applications, Thermal barrier coatings, Thermal expansion, Thermal expansion coefficients, Thermal exposure, Thermal properties, Thermal spraying, Thick plasmas, XRD, Yttria stabilized zirconia, Yttrium alloys, Zirconia, Zirconium alloys
Abstract

Thick plasma sprayed thermal barrier coatings are suitable for thermal and hot corrosion protection of metal components in land-based turbine and diesel engines. In this work, ceria-yttria co-stabilized zirconia coatings were deposited by atmospheric plasma spraying in a mixture of non-transformable tetragonal t′ and cubic c zirconia phases. Free-standing coatings were isothermally annealed at 1315 °C for different times and their crystal structure was studied by XRD. No phase decomposition occurred. Columnar grains grew in the molten splats with increasing annealing time according to a preferential direction and, after 50 h of heat treatment, they were partially replaced by equiaxed grains. Both in-plane and out-of-plane thermal expansion coefficients (CTEs) were measured from coating expansion during heating. The CTE was slightly sensitive to thermal exposure in out-of-plane direction, whereas it kept almost constant in plane direction. The specific heat capacity Cp of annealed coatings, measured by differential scanning calorimetry (DSC), decreased in comparison with as-sprayed coating, due to high-temperature sintering. © 2009 Elsevier Ltd and Techna Group S.r.l.

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cited By 35

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-76449115805&doi=10.1016%2fj.ceramint.2009.10.020&partnerID=40&md5=78ebe6079a8d5786adfdb1c83690c1e8
DOI10.1016/j.ceramint.2009.10.020
Citation KeyDiGirolamo2010961