About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Thermodynamic Design and Environmentally Controlled Synthesis of Soft Magnetic Ferrite-Metal Nanocomposites |
| Author(s) |
Paul R. Ohodnicki, Azhagu Dhanapal, Bishal Bhandari, Zisong Wang, Suraj Mullurkara |
| On-Site Speaker (Planned) |
Paul R. Ohodnicki |
| Abstract Scope |
Soft magnetic ferrite—metal composites overcome limitations of low saturation flux densities of ferrites used in high frequency power electronic applications to aid component miniaturization. Environmentally controlled synthesis involves synthesizing ferrite powders using conventional solid-state reaction including thermal processing with controlled gas atmospheres during sintering and/or through a subsequent additional processing step to selectively form metal nanoprecipitates in a ferrite matrix. Composite thermodynamic stability is modeled using Thermo-Calc to provide guidance for composition and processing windows that selectively convert cations to ferromagnetic metal precipitates embedded within the ferrite matrix while suppressing secondary oxide formation. Structural and magnetic characterization of phase fraction, nano/microstructure, precipitate composition, static, and dynamic magnetic properties are presented. Increases in saturation magnetization >~ 25% are demonstrated to date compared to base spinel ferrites. Current progress and future optimization pathways targeting scalable processing of high-performance nanocomposites with tailored magnetic properties are discussed. |