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| 1 | Particle size dependent sinterability and magnetic properties of recycled HDDR Nd-Fe-B powders consolidated with spark plasma sintering显示文摘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/m.Spark plasma sintering was exploited to consolidate the nanograined HDDR powders and limit the abnormal grain coarsening.The 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 min.The burr milled fine HDDR powder under similar SPS conditions and after thermal treatment results in Hci=940 kA/m.The 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 size.The gain in oxygen content doubles for <50 μm sized particles as compared with coarser fractions(>200 μm).The XRD analysis for fractionated powder indicates an increase in Nd2O3 phase peaks in the finer(<100 μm)fractions.Similarly,the Hci reduces from 820 kA/m in the coarse particles(>200 μm) to 460 kA/m in the fine sized particles(<100μm).SPS was done on each HDDR powder fraction under the optimal conditions to measure the variation in Hci and density.The Hci of SPS-ed coarse fraction(>200 μm) is higher than 930 kA/m and it falls abruptly to just 70 kA/m for the fine sized particles(<100 μm).The thermal treatment further improves the Hci to>1000 kA/m only up to 100 μm sized fractions with>90% sintered density.The full densification(>99%) is observed only in the coarse fractions.The loss of coercivity and lack of sinterability in the fine sized particles(<100 μm) are attributed to a very high oxygen content.This implies that during recycling,if good magnetic properties are to be maintained or even increase the HDDR powder particles can be sized down only up to≥100 μm. | Awais Ikram Farhan Mehmood Richard Stuart Sheridan Muhammad Awais Allan Walton Anas Eldosouky Saso Sturm Spomenka Kobe Kristina Zuzek Rozman | 2020 | Journal of Rare Earths2020，38，1： | 5 |
| 2 | Melanotic neuroectodermal tumour of infancy: Report of two cases and review of the literature显示文摘 | Spomenka Manojlovi? Mi?o Virag Ivica Luk?i? Danko Müller | 2011 | Journal of Cranio-Maxillofacial Surgery2011，，4： | 1 |
| 3 | Determination of anthocyanins in four Croatian cuhivars of sour cher- ries(Prunus cerasus)显示文摘 | Valentina S Spomenka K Dajana G | 2005 | European Food Research and Technology2005，220，： | 1 |
| 4 | Polymer-dimer distribution in theelectrochemical synthesis of polyaniline显示文摘 | Ljerka D Zoran M Spomenka K | 1995 | Electrochimica Acta1995，40，11： | 1 |
| 5 | Determination of anthocyanins in four Croatian cultivars of sour cherries (Prunus cerasus)显示文摘 | Valentina ?imuni? Spomenka Kova? Dajana Ga?o-Soka? Werner Pfannhauser Michael Murkovic | 2005 | European Food Research and Technology (-)2005，，5： | 1 |
| 6 | An oral delivery system for indomethicin engineered from cationic lipid emulsions and silica nanoparticles显示文摘 | Spomenka Simovic He Hui Yunmei Song Andrew K. Davey Thomas Rades Clive A. Prestidge | 2010 | Journal of Controlled Release2010，，3： | 1 |
| 7 | Inflammation,Haemostatic Disturbance,and Obesity:Possible Link to Pathogenesis of Diabetic Retinopathy in Type 2 Diabetes显示文摘 | Martina T Spomenka L Snje Dana K | 2013 | Mediators of Inflammation Volume2013，10，81： | 1 |
| 8 | The Shaping and Densification of Silicon Carbide while Avoiding Alumina as a Sintering Additive显示文摘 | Katja Rade Sasa Novak Spomenka Kobe | 2011 | 材料科学与工程(中英文A版)2011，1，3X： | 0 |
| 9 | Dementia Caused by Heptatis C Virus--Case Report显示文摘 | Spomenka Kidemet-Piskac Lea Unusic | 2017 | Journal of Pharmacy and Pharmacology2017，5，4： | 0 |
| 10 | A Systematic Classification and Labelling Approach to Support a Circular Economy Ecosystem for NdFeB-Type Magnet显示文摘Availability of magnetic materials is most crucial for modern Europe,as they are integral to energy conversion across the renewable energy and electric mobility sectors.Unfortunately,there is still no circular economy to reuse and capture value for these types of materials.With the prediction that the need for NdFeB Rare Earth(RE)magnets will double in the next 10 years,this problem becomes even more urgent.As 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 qualities.It 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 alloy.The 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. | Carlo Burkhardt Antje Lehmann Benjamin Podmiljsak Spomenka Kobe | 2020 | 材料科学与工程(中英文B版)2020，10，4： | 0 |
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