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

Giovanni Di Girolamo, Caterina Blasi, Monica Schioppa, Leander Tapfer

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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.
Original languageEnglish
Pages (from-to)961 - 968
Number of pages8
JournalCeramics International
Volume36
Issue number3
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Process Chemistry and Technology
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films

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