Opportunities for improved TBC durability in the CeO2-TiO2-ZrO2 system

Jessica A. Krogstad, Maren Lepple, Carlos G. Levi

Research output: Contribution to journalArticlepeer-review

Abstract

A previously unreported, relatively large single-phase tetragonal field with exceptional tetragonality has been stabilized up to at least 1350°C by co-doping zirconia (ZrO2) with ceria (CeO2) and titania (TiO2). The tetragonality is believed to be responsible for an increase in micro-indentation toughness, relative to traditional 7YSZ, based on activation of ferroelastic domain switching. Evidence consistent with this toughening mechanism has been directly observed via transmission electron microscopy (TEM). Within grains >5μm, long-range anion order is induced within elastically switched domains. This observation provides additional insight on the toughening mechanism. In the absence of stoichiometric anion vacancies, the large non-transformable tetragonal composition range and the improved toughness suggest that this system could be a promising option for next generation thermal barrier coatings.

Original languageEnglish (US)
Pages (from-to)44-52
Number of pages9
JournalSurface and Coatings Technology
Volume221
DOIs
StatePublished - Apr 25 2013
Externally publishedYes

Keywords

  • Ferroelastic switching
  • Thermal barrier coatings
  • Toughness
  • Zirconia

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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