|About this Abstract
||Materials Science & Technology 2012
||Solution-Based Processing for Ceramic Materials
||Processing Control of Anisotropic, Composite LSM-YSZ Freeze-Casts with Hierarchical Porosity for SOFC Cathodes
||Aaron Lichtner, Rajendra Bordia, Denis Roussel, Christophe L. Martin
|On-Site Speaker (Planned)
Solid Oxide Fuel Cell (SOFC) cathodes are typically made from a mixture of lanthanum strontium manganite (LSM) and Yttria-stabilized zirconia (YSZ) particles that form interconnected networks within a highly porous structure. Freeze-casting exploits the freezing kinetics of a solvent in a well-dispersed slurry to create anisotropic microstructures with a high level of control. Partial sintering of the freeze-casts results in two distinct and independently controlled levels of porosity. The initial solid-loading of the LSM-YSZ slurries was altered to create a range of porosities. Independently, the macro-pore size was controlled using dynamic freezing profiles ranging from 1 - 5°C/min. Altering these two parameters resulted in microstructures with a wide range of controllable and reproducible properties. Percolation of LSM and YSZ throughout the freeze-cast structures was confirmed through compositional mapping.
This research is supported by a Materials World Network Grant from NSF-DMR (Grant#: 1008600)