| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Ceramics: Fundamental Structure—Property—Performance Relationships
|
| Presentation Title |
Effect of Sodium on the Processability and Mechanical Properties of Nanocrystalline
Magnesium Aluminate |
| Author(s) |
Isabella Loureiro Muller Costa, Ricardo Castro, Joice Miagava |
| On-Site Speaker (Planned) |
Isabella Loureiro Muller Costa |
| Abstract Scope |
The undesirable grain coarsening that nanocrystalline ceramics experiences, when exposed to high temperatures, due to their excess grain boundary (GB) energy, can be controlled through the segregation of dopants to the GB. Nanocrystalline materials with higher GB stability have displayed a postponed Hall-Petch breakdown. Recent reports have related an increase in the local toughness of nanoceramics to the more homogenous energetic landscape across the GB experienced with the dopant segregation. In this work, we describe the role of sodium (Na) as a dopant in magnesium aluminate (MAO) which is of great interest for sensor array compartment. The pellets were sintered by spark plasma sintering; the effect of sodium content on the processability, hardness, and toughness of MAO were evaluated. Translucent pellets were obtained with concentrations as high as 10.9mol% of Na. The increase in the dopant content led to a decrease in the sintering pressure and an increase in hardness. |