Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets.

Richard Sheridan, Andrew Williams, Ivor Harris, Allan Walton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The hydrogenation disproportionation desorption recombination (HDDR) process has been investigated as a possible means of producing bonded magnets from used NdFeB-type sintered magnets and manufacturing scrap material. It has been shown that increasing the processing temperature increased the equilibrium pressure for disproportionation and overall reaction time. The magnetic properties were affected significantly by the change in processing temperature with a peak in properties observed at 880⁰C producing magnetic powder with a remanence of 1.08 (±0.02) T, a coercivity of 840 (±17) kA m-1, and a maximum energy product of 175 (±2.5) kJ m-3. Further work has shown that simultaneous processing of sintered magnets with varying compositions could be achieved by increasing the hydrogen pressure.
Original languageEnglish
Title of host publicationProceedings of the 22nd International Workshop on Rare Earth Permanent Magnets and their Applications
Place of PublicationNagasaki, Japan
Pages394-397
Number of pages4
Publication statusPublished - Sep 2012

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