About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Sintering and Related Powder Processing Science and Technologies
|
| Presentation Title |
Effect of High Pressure Spark Plasma Sintering on microstructure and properties of nano-structured magnesium aluminate spinel |
| Author(s) |
Sandrine Cottrino, Thierry Douillard, Nicholas Blanchard, Laurent Gremillard, Sylvain Meille, Sylvie Le Floch |
| On-Site Speaker (Planned) |
Sandrine Cottrino |
| Abstract Scope |
Polycrystalline magnesium aluminate spinel is a promising transparent ceramic for various applications. This spinel can be prepared by conventional multi-stage processes. However, single-stage spark plasma sintering (SPS) is a less time-consuming approach. The simultaneous application of pressure during sintering allows the production of fine-grained and fully dense optically transparent ceramics.
In this work, high-density nanostructured MgAl₂O₄ ceramics were produced by high pressure SPS up to 5 GPa. High pressure densification produces green bodies with fine pores and high density, which improves the sintering process (to 1.5 GPa pressure, sintering temperatures reduce by 500°C). This can be explained by an optimization of the granular arrangement and, at high pressure, by a plastic deformation of nanoparticles. Applying high pressure during sintering, it results in dense, transparent ceramics without grain coarsening. Thus, the plasticity induced in the nanoparticles modifies the sintering mechanisms and has an impact on the macroscopic properties of the ceramics. |