| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
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| Presentation Title |
Field-assisted Sintering of FeCo/MnZn Ferrite Core-Shell Structured Particles |
| Author(s) |
Bowen Dong, Haobo Wang, Matthew A. Willard, Gabriel Santillan, Andrew Sherman |
| On-Site Speaker (Planned) |
Matthew A. Willard |
| Abstract Scope |
Core-shell FeCo/MnZn ferrite powders were prepared by the sol-gel method with target composition for the MnZn ferrite shell of Mn0.8Zn0.2Fe2O4. The powders were compacted into bulk composites with FeCo separated by an oxide matrix using the field-assisted sintering technique (FAST) at 800°C for 10 min. All resulting compacts achieved relative density >95%. As the MnZn ferrite content in the original core-shell powder increases from 5.01 to 17.10 wt.%, the saturation magnetization of the compacts decreases from 222 Am2/kg to 165 Am2/kg, and the coercivity increases from 772 A/m to 1654 A/m. XRD of the compacts indicates that a chemical reaction dissociates the spinel-structured MnZn ferrite into a rocksalt structured phase. Thermodynamics calculation indicates that the reaction happens between FeCo and MnZn ferrite at 800°C, but favors MnZn ferrite at temperatures 400°C. This prediction was substantiated by FAST consolidation at 400°C. (Supported by NASA SBIR under Contract Number 80NSSC19C0358) |