|About this Abstract
||Materials Science & Technology 2019
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||Magnetic Field-Assisted Freeze Casting of Porous Ceramic Structures
||Jihyung Lee, Robert Wheeler, Samir Aouadi, Diana Berman , Marcus Young, Raymond Brennan
|On-Site Speaker (Planned)
Porous ceramic materials are lightweight, cost-effective, and can be used in dense bulk composite structures with high impact-absorbing capabilities. A new approach was demonstrated for creating porous ceramic structures via magnetic field-assisted freeze casting. The freeze casting method utilizes a phase separation of a premixed solution of water and ceramic powders due to a volume expansion during solidification of water to ice. The magnetic field allows for a more controlled alignment of the pores during freezing. After freezing, the resulting structure is sublimated and sintered, resulting in a porous ceramic structure. In this study, porous SiC ceramics were produced by freeze casting with and without an applied magnetic field. Microstructural variations were evaluated based on powder and solution compositions, freeze casting temperatures, and magnetic field strengths. Samples were characterized using X-ray diffraction, SEM with EDS, PPMS, and Micro-XCT. Mechanical properties of these microstructural variations were also investigated.
||Planned: At-meeting proceedings