|About this Abstract
||Materials Science & Technology 2019
||Phase Transformations in Ceramics: Science and Applications
||Influence of Annealing Temperature and Time on Phase Stability and Fracture Toughness of Rare-earth Stabilized Zirconia
||Archana Loganathan, Surendra B Anantharaman, Mohan B Ponnuchamy, Ashutosh S Gandhi
|On-Site Speaker (Planned)
Yttria stabilized zirconia is a promising material for the top coat of thermal barrier coatings (TBCs). Owing to its high fracture toughness and low thermal conductivity, non-transformable t' tetragonal phase is highly preferred. Upon high temperature exposure, the t' phase transforms to tetragonal + cubic and later the tetragonal phase transforms to monoclinic. So, the search for new top coat material are of our interest. Reverse co-precipitation method is used for synthesizing rare-earth stabilized zirconia and the powder are densified by spark plasma sintering at 1250 °C for 10 min. The as-synthesized powder and as-sintered compact comprised of single tʹ phase. The compacts are isothermally annealed at 1150 and 1250 °C up to 96 h in air to investigate the toughness variation. During annealing, the toughness decreased initially and then increased gradually. This change is correlated with the microstructure development and phase transformation.
||Definite: At-meeting proceedings