Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings

G. Di Girolamo, F. Marra, C. Blasi, E. Serra, T. Valente

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Abstract

Nanostructured yttria stabilized zirconia (YSZ) coatings were deposited by Atmospheric Plasma Spraying (APS). X-ray diffraction (XRD) was used to investigate their phase composition, while scanning electron microscopy (SEM) was employed to examine their microstructure. The coatings showed a unique and complex microstructure composed of well-melted splats with columnar crystal structure, partially melted areas, which resembled the morphology of the powder feedstock, and equiaxed grains. Vickers microhardness of nanostructured zirconia coatings was similar to that of the conventional ones and strongly depended on the indentation load. Otherwise, a higher thermal shock resistance was found. This effect was addressed to the retention of nanostructured areas in coating microstructure and to the corresponding high porosity. © 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Original languageEnglish
Pages (from-to)2711 - 2717
Number of pages7
JournalCeramics International
Volume37
Issue number7
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

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

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