Densification of NdFeB magnets by electro-discharge sintering - Microstructure, mechanical and magnetic properties
March 10-15, 2019
In this work, the densification process of nanocrystalline NdFeB powder by electro-discharge sintering (EDS) was investigated. The EDS technique is used as a fast and energy-saving compaction process for metal powders. In contrast to the spark plasma sintering (SPS) process, EDS has not received much attention during recent years. SPS is a low voltage, direct current, pulsed current-activated, and pressure-assisted sintering process. Whereas EDS is also pressure-assisted, but uses electrical energy discharged from capacitors to densify conductive powders. During EDS a large current is discharged within 5 ms from capacitors into a pre-compacted loose powder, thus resulting in complete compaction.
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Lennart Leich, Werner Theisen, and Arne Röttger, "Densification of NdFeB magnets by electro-discharge sintering - Microstructure, mechanical and magnetic properties" in "Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities", Rishi Raj, University of Colorado, USA Olivier Guillon, Forschungzentrum Jülich, Germany Hidehiro Yoshida, National Institute for Materials Science, Japan Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/efe_advancedmaterials_ii/52