|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Microstructural Evolution of Porous Materials by Magnetic Freeze Casting
||Pooya Niksiar, Michael Frank, Joanna McKittrick, Michael Porter
|On-Site Speaker (Planned)
External magnetic fields are applied during the process of directional solidification to control the microstructural evolution of ceramic scaffolds formed by freezing colloidal suspensions. Such porous materials typically have anisotropic microstructures composed of lamellar walls and mineral bridges connecting adjacent lamellae. Lamellar wall spacing and mineral bridge connectivity (length and thickness) are two characteristics that can be controlled during solidification and influence the mechanical properties of the scaffolds. While lamellar wall spacing primarily depends on the freezing conditions, mineral bridge connectivity is increased by increasing the magnetic field strength up to an optimum or by increasing the solidification rate which decreases the lamellar wall spacing (resulting in a higher probability of bridge formation). With increased connectivity, the strength and stiffness of the scaffolds increase when compressed parallel to the mineral bridges formed by external magnetic fields.
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