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 language | English (US) |
---|---|
Pages (from-to) | 44-52 |
Number of pages | 9 |
Journal | Surface and Coatings Technology |
Volume | 221 |
DOIs | |
State | Published - Apr 25 2013 |
Externally published | Yes |
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