Abstract
An 8 (wt.) % yttria partially stabilized zirconia (YSZ) coating isothermally oxidized in air at 1100 °C for up to 3000 h was investigated by means of indentation and electron microscopy analyses. It is found that the growth kinetics of thermally grown oxides followed a parabolic law. The apparent porosity within the coatings decreased after isothermal oxidation. The tetragonal prime YSZ phase transformed into cubic and then monoclinic phases during isothermal oxidation. Elastic modulus, microhardness and fracture toughness of the coating increased as oxidation duration prolonged. The correlation between microstructural variation and mechanical properties was discussed.
Original language | English (US) |
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Pages (from-to) | 8815-8823 |
Number of pages | 9 |
Journal | Ceramics International |
Volume | 45 |
Issue number | 7 |
DOIs | |
State | Published - May 2019 |
Funding
This research project was supported by Natural Science Foundation of Zhejiang Province (No. LY18E050027 ), Natural Science Foundation of Ningbo Municipality (No. 2018A610145 ) and Joint Funds of NSFC-ZJ (No. U1609208 ).
Keywords
- Isothermal oxidation
- Mechanical properties
- Microstructural evolution
- Thermal barrier coatings (TBCs)
- Transmission electron microscopy (TEM)
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry