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Gandha, Kinjal; Ouyang, Gaoyuan; Gupta, Shalabh; Kunc, Vlastimil; Parans Paranthaman, M.; Nlebedim, Ikenna C.
Waste management, 05/2019, Volume: 90, Issue: CJournal Article
Display omitted •New bonded magnets made with wastes from additive manufacturing (AM).•Environmentally benign process for recycling waste AM polymer bonded NdFeB magnets.•Process is simple and can be easily integrated into existing or new startup plants.•Process enables closed-loop sustainability in critical rare earth elements supply.•Properties of recycled magnets are on par with original end-of-life materials. In this work, we describe an efficient and environmentally benign method of recycling of additive printed Nd-Fe-B polymer bonded magnets. Rapid pulverization of bonded magnets into composite powder containing Nd-Fe-B particles and polymer binder was achieved by milling at cryogenic temperatures. The recycled bonded magnets fabricated by warm compaction of ground cryomilled coarse composite powders and nylon particles showed improved magnetic properties and density. Remanent magnetization and saturation magnetization increased by 4% and 6.5% respectively, due to enhanced density while coercivity and energy product were retained from the original additive printed bonded magnets. This study presents a facile method that enables the direct reuse of end-of-life bonded magnets for remaking new bonded magnets. In addition to magnetic properties, mechanical properties comparable to commercial products have been achieved. This research advances efforts to ensure sustainability in critical materials by forming close loop supply chain.
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