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Meeting Materials Science & Technology 2019
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Influence of Annealing Temperature and Time on Phase Stability and Fracture Toughness of Rare-earth Stabilized Zirconia
Author(s) Archana Loganathan, Surendra B Anantharaman, Mohan B Ponnuchamy, Ashutosh S Gandhi
On-Site Speaker (Planned) Archana Loganathan
Abstract Scope 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.
Proceedings Inclusion? Definite: At-meeting proceedings

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