Speaker
Description
Dissolution between $Y_2O_3$ and $CeO_2$ was studied with the goal to understand microstructure and sintering in $CeO_2$-particle reinforced $Y_2O_3$ composites. In one type of experiment the microstructure of composites made by hot pressing and by spark plasma sintering were compared. Subsequent heat treatments in air were performed to study dissolution of $CeO_2$ into $Y_2O_3$. In a second type of experiment, diffusion bonded couples of $Y_2O_3$ and $CeO_2$ were prepared by heating at elevated temperature in air. The results of these experiments reveal that the evolution of the microstructure is more complicated than expected based on existing literature. At least one intermediate phase forms between $Y_2O_3$ and $CeO_2$ and may dictate the dissolution kinetics. Interdiffusion between $Y_2O_3$ and $CeO_2$ leads to significant microstructure changes, including porosity in $Y_2O_3$ and columnar grain growth in C$eO_2$. These microstructure observations are discussed in the context of dissolution mechanisms.
| Professional Status of the Speaker | Senior Scientist |
|---|---|
| Invitation letter for visa | No |
| Interest in submitting a paper in a special issue of | Journal of the European Ceramic Society (Elsevier) |
