| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Tuning Nano/Microstructure and Properties by Densification of Metastable Powders |
| Author(s) |
Gottlieb Uahengo, Darren Dewitt, Yasuhiro Kodera, Javier Garay |
| On-Site Speaker (Planned) |
Javier Garay |
| Abstract Scope |
The ability to control phase content can be powerful for tuning material properties. We present strategies for phase content design by
leveraging metastability of powders and resulting ceramics. Magnesium MgAl2O4 and yttria stabilized zirconia are important structural ceramics with proven applications as a hard, temperature resistant materials and high strength optical windows. In the spinel case, we tudy the reaction densification of nano-sized MgO and metastable γ-Al2O3 to form MgAl2O4 instead of the typical stable α-Al2O3 and micrometer-sized MgO. We show that the reaction kinetics of γ-Al2O3 – nMgO are substantially faster and occur at significantly temperatures compared to previous kinetic studies of α-Al2O3 – μMgO, revealing that they are not controlled by the same mechanism. In the YSZ case, we show that the phase content can be varied in fully dense transparent ceramics to optimize optical/mechanical properties. |