Speaker
Description
This study reflects a need for fine comprehension of liquid-phase sintering of SiC-Al2O3/Y2O3 ceramics for an acid corrosion application. Although the overall sintering and densification behaviour of silicon carbide is well known, this work aims to bring some new insight on the relationship between grain growth of SiC particles, the structure of the oxide intergranular phase (IGP), and the sintering conditions. To do this, low pressure Spark Plasma Sintering on a commercial SiC-Al2O3/Y2O3 powder has been used. These experiments allowed to investigate different sintering conditions in order to obtain four different dense microstructures regarding grain size and the intergranular phase: 1) Significant grain growth/crystalline IGP; 2) Low grain growth/crystalline IGP; 3) Significant grain growth/amorphous IGP; 4) Low grain growth/amorphous IGP. The impact of the addition of a fine submicronic TiC powder by freeze-drying has also been tested. The present work provides a comprehensive microstructural characterisation of the samples through SEM/EDS (general microstructure), EBSD (grain size), XRD (nature and quantity of non-SiC phases) as well as TEM observation for deeper study of the grain boundaries. The influence of grain size and crystallisation of the oxide intergranular phase on aqueous hydrofluoric acid corrosion resistance and fluorine gas bubble behaviour has been also evaluated through mass evolution and microstructural comparison.
| Professional Status of the Speaker | Doctoral or Master Student |
|---|---|
| Invitation letter for visa | No |
| Interest in submitting a paper in a special issue of | Journal of the European Ceramic Society (Elsevier) |
