|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials: An FMD Symposium in Honor of Michael E. McHenry
||Processes for the Recycling of Rare Earth Permanent Magnets
||Roland Karl Gauss, Oliver Diehl, Eva Brouwer, Alex Buckow, Konrad GŁth, Oliver Gutfleisch
|On-Site Speaker (Planned)
Rare earth permanent magnets play a key role in many different kinds of mass market technologies. We present two approaches that aim at regaining rare earth alloys from scrap magnets for the production of new high energy density permanent magnets, avoiding cost and energy intensive mechanical and chemical separation processes. Hydrogen decrepitation is used to extract and demagnetise magnet material installed in different kinds of devices. After processing, the powder can be used to directly sinter new magnets or to produce anisotropic bonded magnets (via d-HDDR). Alternatively, scrap magnet material can be melted and processed by melt spinning or strip casting for the production of nanocrystalline or sintered magnets. A key issue is the slagging of impurities, most importantly oxygen, and to optimize alloy composition according to the field of material re-use. A circular economy for magnets along these lines would substantially reduce their environmental footprint and resource criticality.
||Planned: None Selected