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Particle size dependent sinterability and magnetic properties of recycled HDDR Nd-Fe-B powders consolidated with spark plasma sintering

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Journal of Rare Earths 2020年第1期38卷 90-99页

作者： Awais Ikram Farhan Mehmood Richard Stuart Sheridan Muhammad Awais Allan Walton Anas Eldosouky Saso Sturm spomenka kobe Kristina Zuzek Rozman Department for Nanostructured Materials Jozef Stefan InstituteJamova 39SI-1000 LjubljanaSlovenia Jozef Stefan International Postgraduate School Jamova 39SI-1000 LjubljanaSlovenia School of Metallurgy and Materials University of BirminghamEdgbastonBirminghamB152TTUnited Kingdom Magneti Ljubljana d.d.Stegne 37SI-1000 LjubljanaSlovenia

The dependence of the magnetic properties on the particle size of recycled HDDR Nd-Fe-B powders was investigated,with the aim to assess the reprocessing potential of the end-of-life scrap magnets via spark plasma sintering(SPS).The as received recycled HDDR powder has coercivity(Hci)=830 kA/m and particles in the range from 30 to 700 μm(average 220 μm).After burr milling,the average particle size is reduced to 120 μm and subsequently the Hci of fine(milled) powder was 595 kA/*** plasma sintering was exploited to consolidate the nanograined HDDR powders and limit the abnormal grain *** optimal SPS-ing of coarse HDDR powder at 750℃for 1 min produces fully dense magnets with Hci=950±100 kA/m which further increases to 1200 kA/m via thermal treatment at 750℃for 15 *** burr milled fine HDDR powder under similar SPS conditions and after thermal treatment results in Hci=940 kA/*** fine powder is further sieved down from 630 to less than 50 μm mesh size,to evaluate the possible reduction in Hci in relation to the particle *** gain in oxygen content doubles for 200 μm).The XRD analysis for fractionated powder indicates an increase in Nd2O3 phase peaks in the finer(200 μm) to 460 kA/m in the fine sized particles(200 μm) is higher than 930 kA/m and it falls abruptly to just 70 kA/m for the fine sized particles(1000 kA/m only up to 100 μm sized fractions with>90% sintered *** full densification(>99%) is observed only in the coarse *** loss of coercivity and lack of sinterability in the fine sized particles(<100 μm) are attributed to a very high oxygen *** implies that durin

关键词： Reprocessing end-of life scrap Rare earth permanent magnets HDDR Nd2Fe14B Recycling Spark plasma sintering

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The Shaping and Densification of Silicon Carbide while Avoiding Alumina as a Sintering Additive

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材料科学与工程（中英文A版） 2011年第3X期1卷 301-311页

作者： Katja Rade Sasa Novak spomenka kobe Jozef Stefan Institute Department for Nanostructured Materials Ljubljana Slovenia

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A Systematic Classification and Labelling Approach to Support a Circular Economy Ecosystem for NdFeB-Type Magnet

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材料科学与工程（中英文B版） 2020年第4期10卷 125-133页

作者： Carlo Burkhardt Antje Lehmann Benjamin Podmiljsak spomenka kobe Institute for Precious and Technology Metals Pforzheim UniversityPforzheim 75175Germany Department of Nanostructured Materials Institut Jozef-StefanLjubljana 1000Slovenia

Availability of magnetic materials is most crucial for modern Europe,as they are integral to energy conversion across the renewable energy and electric mobility ***,there is still no circular economy to reuse and capture value for these types of *** the prediction that the need for NdFeB Rare Earth(RE)magnets will double in the next 10 years,this problem becomes even more *** the quality of the recollected materials varies significantly,the development of a classification system for recyclate grades of EOL NdFeB magnets in combination with an eco-labelling system for newly produced RE permanent magnets is proposed to clearly identify different magnet types and *** categorises the NdFeB magnets by technical pre-processing requirements,facilitating use of the highly effective HPMS process(Hydrogen Processing of Magnetic Scrap)for re-processing extracted materials directly from NdFeB *** proposed measures will have a great impact to overcome existing low recycling rates due to poor collection,high leakages of collected materials into non-suitable channels,and inappropriate interface management between logistics,mechanical pre-processing and metallurgical metals recovery.

关键词： NdFeB permanent magnet magnet recycling HPMS hydrogen decrepitation labelling&grading data matrix code(DMC) reycling factor MaXycle SUSMAGPRO

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