Speaker
Description
Along ceramic processing cycle, it is well known that even a small change of the powders surface energy can cause a considerable effect on the final properties. The processing steps which are most affected by the change of surface energy are powder synthesis, shaping (especially wet methods), and sintering.
A fundamental issue is to enhance densification process using non‐conventional-sintering techniques capable to allow densification of complex parts through fast and energy saving technologies. The surface energy of powders can be modified by conventional methods like high‐energy milling, coating etc. However, Atomic Layer Deposition (ALD) of particles allows the development of novel routes in the production of advanced ceramic materials.
Part of this research consists of studying new processing and sintering routes for the manufacture of components with improved properties by modifying the surface energy of the material. For such purpose LSM (La0.8Sr0.2MnO3) + yttria stabilized zirconia (8Y-TZP) composites were prepared according two processing routes: on one hand, a mixture was prepared by a colloidal method, and, on the other hand, the base commercial LSM powder was coated by a 8Y-TZP nanolayer by ALD. In the last case the coating process was carried out by means of temperature and pressure in a closed chamber, using nitrogen as a vehicle for deposition. The materials obtained by both routes were sintered making use of unconventional Spark Plasma Sintering (SPS) and Microwave (MW) sintering processes. The microstructure and mechanical properties of the sintered materials were finally studied and compared.
| Speaker Country | Spain |
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