|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Synthesis and Processing of Hard Iron Oxide Nanocomposites for Rare Earth Free Permanent Magnets
||Kyle Chan, Yasuhiro Kodera, Javier Garay
|On-Site Speaker (Planned)
While iron oxides have been known and studied for centuries, it is still a promising building block for permanent magnets for various reasons. Fe and O are extremely earth abundant, and thus are relatively inexpensive. Also, Iron (III) Oxide exists in various polymorphs which have an amazing range of magnetic properties. For example, the most stable phase, a-FeČ2O3 is an antiferromagnet, metastable g-Fe2O3 is soft ferrimagnet andmetastbale g-Fe2O3 is a canted antiferromagnet that has a very large coercivity (up to 2 Tesla). We present results on the chemical synthesis of high coercivity iron oxide phases and the integration into a consolidated nanocomposite via Current Activated Pressure Assisted Densification (CAPAD). We will show that this synthesis/processing route can produce hard bulk magnets with coercive fields comparable to typical rare-earth magnets based primarily on iron oxides.