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Academic literature on the topic 'NdFeB'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 July 2024

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Journal articles on the topic "NdFeB"

1

Gouteff, P. C., L. Folks, and R. Street. "MFM study of NdFeB and NdFeB/Fe/NdFeB thin films." Journal of Magnetism and Magnetic Materials 177-181 (January 1998): 1241–42. http://dx.doi.org/10.1016/s0304-8853(97)00814-7.

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2

Liu, Wen Feng, Kai Zhang, and Hai Jie Zhang. "Microstructure and Magnetic Properties of C-Axis-Oriented Mo/NdFeB/Mo Films." Applied Mechanics and Materials 271-272 (December 2012): 343–46. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.343.

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Mo/NdFeB/Mo thin flms were deposited by dc-magnetron sputtering onto Si substrates, then were annealed at 650 °C for 30 min. Nanostructured Mo/NdFeB/Mo films were successfully obtained with the magnetic easy axis of NdFeB perpendicular to the film plane. It was found that the c-axis orientation depends on the NdFeB sputter power. Good c-axis orientation was obtained at 40W NdFeB sputter power. Meanwhile, Mo layer can not only induce the c-axis orientation of NdFeB, but also improve the crystallization of NdFeB grains.

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3

Liu, Wenfeng, Mingang Zhang, Kewei Zhang, and Yuesheng Chai. "Microstructure and Magnetic Properties of NdFeB Films through Nd Surface Diffusion Process." Advances in Condensed Matter Physics 2017 (2017): 1–5. http://dx.doi.org/10.1155/2017/4296243.

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Ta/Nd/NdFeB/Nd/Ta films were deposited by magnetron sputtering on Si (100) substrates and subsequently annealed for 30 min at 923 K in vacuum. It was found that the microstructure and magnetic properties of Ta/Nd/NdFeB/Nd/Ta films strongly depend on the NdFeB layer thickness. With NdFeB layer thickness increasing, both the grain size and the strain firstly reduce and then increase. When NdFeB layer thickness is 750 nm, the strain reaches the minimum value. Meanwhile, both the in-plane and perpendicular coercivities firstly drastically increase and then slowly decrease with NdFeB layer thickness increasing. The highest in-plane and perpendicular coercivities can be obtained at NdFeB layer thickness of 750 nm, which are 21.2 kOe and 19.5 kOe, respectively. In addition, the high remanence ratio (remanent magnetization/saturation magnetization) of 0.87 can also be achieved in Ta/Nd/NdFeB (750 nm)/Nd/Ta film.

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Ramlan, Ramlan, Dedi Setiabudidaya, A. A. A. Bama, and Muljadi. "Analysis Magnetic Properties and Corrosion Resistance of Hybrid Bonded Magnet BaFe₁₂O₁₉-NdFeB." Key Engineering Materials 855 (July 2020): 28–33. http://dx.doi.org/10.4028/www.scientific.net/kem.855.28.

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Permanent Magnets made in the form of hybrid bonded BaFe12O19 / NdFeB and with binder of Poli Vynil Alcohol (PVA) as much as 3% of the total mass in each sample. The weight ratio hybride system BaFe12O19 : NdFeB is 0 % BaFe12O19 : 100 % NdFeB ; 50% BaFe12O19 : 50 % NdFeB and 70% BaFe12O19 : 30 % NdFeB. The material preparation process was begun from mixing of raw materials using HEM for 15 minutes, then added 3% wt. of PVA. The mixed powder was formed a pellet using a hydraulic press with a force of 4 tons for 1 minute, then heated with an vacuum oven at a temperature of 110 ° C for 1 hour and the last step was magnetization using impulse magnetizer. The characterization of pellet sample was done namely measurement of bulk density, flux magnetic and hysteresis loop using VSM and then measurement of corrosion resistance of hybride bonded magnet. The characterization results show that bulk density value of sample hybride 50% BaFe12O19 – 50 % NdFeB is more larger than sample hybride 70% BaFe12O19 – 30 % NdFeB , and The highest coercivity and remanence values of 3900 Oe and 2500 Gauss respectively were achieved in samples with a composition of 50% Ba-ferrite - 50% NdFeB. The hybride bonded magnet Ba-ferrite/NdFeB has more corrosion resistance than bonded magnet 100 % NdFeB.

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Zhao, Dong, Wenli Pei, Xiaoyang Wang, Jian Zheng, Chunhong Liu, and Jianjun Wang. "Influence of a Reduction Process on the Phase Component and Magnetic Properties of NdFeB Magnetic Nanoparticles." Journal of Nanoscience and Nanotechnology 21, no. 1 (January 1, 2021): 715–19. http://dx.doi.org/10.1166/jnn.2021.18460.

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NdFeB magnetic nanoparticles with a main phase of Nd2Fe14B have successfully been synthesized. The preparation includes the following processes. First, the NdFeB intermediate was synthesized by a wet-chemical method. The NdFeB intermediate was annealed at 800 °C, which resulted in the formation of an NdFeB oxide. Then, the NdFeB oxide was reduced into NdFeB nanoparticles by a second-step reduction annealing with a CaH2 reductant. The second-step reduction annealing temperature was a key factor in preparing the NdFeB nanoparticles. A lower reduction temperature of 900 °C could not completely reduce the NdFeB oxide into Nd2Fe14B. There were some residual unreduced nonmagnetic phases in the prepared materials, which resulted in obvious decreases of coercivity. A sufficiently high second-stage reduction temperature resulted in an increased reduction, and more of the Nd2Fe14B phase could be obtained. In this work, nanoparticles with a uniform morphology and an increased Nd2Fe14B phase could be obtained at an optimum reduction temperature of 940 °C, achieving a high coercivity of 5.4 kOe.

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Sudiro, Toto, Didik Aryanto, Nenen Rusnaeni Djauhari, Citra Wara Br Sinuraya, Syahrul Humaidi, and Nanang Sudrajat. "Structure and Magnetic Properties of Spark Plasma Sintered NdFeB." Advanced Materials Research 1112 (July 2015): 27–31. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.27.

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A spark plasma sintering technique was used to consolidate NdFeB compacts at four different temperatures as 750°C, 850°C, 950°C and 1030°C. The surface of specimens was polished to remove the carbon paper on the surface of NdFeB compacts by using SiC paper for up to #1500 in grit. The polished NdFeB compacts were then magnetized by using impulse magnetizer K-series. In this study, the effects of temperature on the structure and magnetic properties of NdFeB magnet were studied. The results show that depending on the fabrication temperature, the X-ray diffraction patterns of NdFeB compacts are distinct. This suggests that the structure of NdFeB compacts is changed with increase in fabrication temperature. Meanwhile, the remanance Br and energy product BH(max) of NdFeB magnets tend to decrease as fabrication temperature increase.

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7

Afrilinda, Eva, Dagus Resmana Djuanda, Shinta Virdhian, Martin Doloksaribu, Moch Iqbal Zaelana Muttahar, and Sri Bimo Pratomo. "Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process." Indonesian Journal of Chemistry 21, no. 3 (December 22, 2020): 626. http://dx.doi.org/10.22146/ijc.59096.

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To understand the morphology of the coercivity enhancement by heat treatment, a commercial sintered NdFeB-type permanent magnet is annealed, and the coercivity is measured by Permagraph. It is shown that the coercivity is increased compared to the initial. Observation by X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDS) is then conducted. The XRD result shows the amount of NdFeB content in the NdFeB-type permanent magnet is increased after heat treatment. The more significant amount of NdFeB content causes higher coercivity. The maximum coercivity, 19 kOe, is achieved at 850 °C of heat treatment temperature, where the NdFeB content is at the highest amount. Microstructural characterizations using SEM-EDS show that at 850 °C of heat treatment temperature, the iron (Fe) content in the grain boundaries is the lowest. It causes higher coercivity. This is due to the magnetically decoupled between NdFeB grains. The decoupling magnet of the NdFeB grains is affected by the Fe content in the grain boundaries. High-temperature heat treatment at 900 and 1050 °C led to the decomposition of NdFeB content in the grains and increased the Fe content in the grain boundaries, which resulted in a substantial reduction of magnetic coercivity.

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Ramlan, Ramlan, Balada Soerya, Amdy Fachredzy, Marzuki Naibaho, and Masno Ginting. "EFFECT OF SILICON RUBBER (SIR) IN FABRICATION OF NdFeB/BaFe12O19-BASED HYBRID MAGNET." Indonesian Physical Review 7, no. 1 (November 7, 2023): 32–38. http://dx.doi.org/10.29303/ipr.v7i1.258.

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The purpose of this study was to determine the effect of physical properties (density), magnetic properties (magnetic flux), and mechanical properties (tensile strength) of NdFeB- BaFe12O19 hybrid magnets with silicon rubber adhesive. NdFeB - BaFe12O19 permanent magnet has been made with a silicon rubber (SIR) adhesive mixture. The percentage variations of magnetic powder materials used are NdFeB: BaFe12O19 (95%: 5%) and NdFeB: BaFe12O19 (90%: 10%) mixed with a weight percentage of silicone rubber with variations of 20%, 40%, 60% and 80%. Characterization includes physical properties in the form of density where the sample with 20% SIR variation has the largest bulk density value of 3.28 g/cm3 for NdFeB: BaFe12O19 (95%: 5%) and 3.24 g/cm3 for NdFeB: BaFe12O19 (90%: 10%), and mechanical properties in the form of tensile strength where the most optimum elasticity value is at 80% silicone rubber. Meanwhile, the most optimum magnetic properties of materials are owned by material samples with variations of SIR at a concentration of 20% for sample variations of 95% NdFeB and 5% BaFe12O19, which is 602.8 Gauss.

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9

Qin, Wan Zhong, and Jie He. "The Press and Mold for Bonded NdFeB Magnet Molding." Advanced Materials Research 1004-1005 (August 2014): 1373–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1373.

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Bonded NdFeB is a high performance composite magnetic materials which developed in recent years. Compression molding is the most important making method of bonded NdFeB magnets. The Characteristics of bonded NdFeB magnets are introduced. Based on test, research and lot production practice, the important effects of mould structure, press structure and compression molding actions on magnets’ quality are analyzed, The key techniques that controlling the quality of bonded NdFeB magnets are summarized.

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10

Jantarattana, P., C. Sirisathitkul, A. Hunyek, and S. Maensiri. "Electric and Magnetic Properties of Recycled NdFeB-Natural Rubber Composites." Advanced Composites Letters 20, no. 2 (March 2011): 096369351102000. http://dx.doi.org/10.1177/096369351102000203.

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Electromagnetic properties of natural rubber (NR) incorporated with recycled neodymium-iron-boron (NdFeB) powder from 0 to 120 phr by the two-roll mill technique were studied. The remanent magnetization, coercive field and logarithmic value of the electrical permittivity were linearly increased with the NdFeB loading according to the rule of mixture suggesting that interactions between NdFeB clusters were moderate. The addition of 120 phr NdFeB also increased the reflection loss of NR.

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Dissertations / Theses on the topic "NdFeB"

1

Li, Ying. "The oxidation of NdFeB alloys." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395924.

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2

Al-Khafaji, Mohammed Ali. "Magnetic force microscopy of NdFeB hard magnetic alloys." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284776.

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Brooks, Oliver Peter. "The hydrogen ductilisation process (HyDP) for NdFeB alloys." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8433/.

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The work in this thesis aims to investigate the ductility of s-HD (solid hydrogenation disproportionation) processed book mould cast NdFeB material in order to develop a novel processing route for producing fully dense magnetic material with a high energy product. A major drawback of NdFeB–based alloys is that they are extremely brittle. Therefore, to produce a fully dense magnet these alloys must be broken down into a powder and hot pressed or sintered followed by cutting and grinding to the desired shape and precise dimensions. This process is time consuming, energy intensive and produces a significant amount of waste which is not readily recyclable. This thesis reports a potentially new application of hydrogen as a promising high temperature processing tool in which the normally brittle Nd\(_2\)Fe\(_1\)\(_4\)B based intermetallic absorbs and reacts with hydrogen, converting it into a ductile, disproportionated condition, which can be subsequently compressed at room temperature. It can then be restored to its original state by removal of the hydrogen under partial vacuum at elevated temperatures. By maintaining a solid form throughout, almost zero waste material is produced and the deformed material exhibits a high coercivity and a useful degree of anisotropy.

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Lorenz, Amanda Leigh. "Improvement of NdFeB permanent magnets via diffusion annealing." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10142.

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Mestrado em Ciência e Engenharia de Materiais
Os magnetos sinterizados de Nd-Fe-B, têm o maior produto de energia de todos os magnetos e têm vindo a substituir progressivamente os magnetos ferróicos em aplicações onde é necessária uma maior densidade de energia. São áreas como carros híbridos, acionamento de turbinas eólicas, bobines de motores, e também na miniaturização de dispositivos eletrónicos. Um parâmetro importante é a sua coercividade, e respetiva dependência na temperatura, que determina o intervalo de temperatura de aplicação. A fim de melhorar as temperaturas de funcionamento, elementos diversos, especialmente terras raras pesadas (HRE), tais como disprósio ou térbio, têm sido adicionadas como um meio de aumentar a coercividade, levando, no entanto, a uma diminuição da remanência. Embora as HREs sejam tradicionalmente incorporadas durante o processo de sinterização, foi demonstrado que a aplicação de uma camada superficial de Dy, seguida de recozimento pode exigir menos Dy, a fim de obter uma determinada coercividade. Este processo utiliza a difusão por fronteiras de grão (Grain Boundary Diffusion, GBD). O objetivo deste trabalho foi reduzir a quantidade de Dy necessário para atingir um desejado aumento da coercividade em pequenos magnetos de Nd-Fe-B utilizando processos GBD e experimentação com adições de Cu. Os magnetos foram revestidos usando deposição física de vapor (PVD), sujeitos a tratamento térmico e, em seguida caracterizados utilizando técnicas de medição magnética, bem como microscopia electrónica de varrimento SEM. As medições magnéticas foram também usadas para avaliar o processo de difusão de Cu e Dy durante o recozimento. A coercividade aumentou com o tempo de recozimento, em que Dy é difundido no sistema, alcançando melhorias de cerca de 50% na coercividade. No entanto, a distância de difusão foi limitada a cerca de 100 μm a partir da superfície da amostra. Os aumentos relativos na coercitividade por unidade de Dy adicionado ao sistema usando GBD foram maiores do que com Dy incorporado durante a sinterização. A Inclusão de Cu não foi considerada benéfica para o sistema.
Sintered Nd-Fe-B rare earth (RE) magnets have the highest energy product of any magnets and have been progressively replacing ferrous magnets in applications where a high energy density is needed. This pertains to areas such as hybrid cars, direct-drive wind turbines, voice coil motors, as well as the miniaturization of electronic devices. An important parameter of these magnets is their coercivity, respectively the temperature dependence thereof, which determines the temperature range accessible to the magnets. In order to improve the working temperatures, various elements, most notably heavy rare earth (HRE) elements such as dysprosium or terbium, have been alloyed in order to increase the coercivity; however, a remanence decrease results. Although HREs are traditionally included during the sintering process, it has been shown that applying the Dy as a coating after sintering followed by annealing may require less Dy in order to reach a given coercivity. This process is called Grain Boundary Diffusion (GBD). The aim of this work was to reduce the amount of Dy needed to attain a desired increase in coercivity in small Nd-Fe-B magnets by employing GBD processes and experimentation with Cu additions. Magnets were coated using physical vapor deposition (PVD) techniques, heat treated, and then assessed using magnetic measurement techniques as well as scanning electron microscopy (SEM). Magnetic measurements were also used to assess the diffusion process of Dy and Cu into the magnets during annealing. The coercivity increased as annealing time progressed and Dy interdiffused throughout the system, reaching improvements in coercivity of about 50%. However, the diffusion distance was limited to about 100 μm from the sample surface. For small Dy additions, the relative gains in coercivity per unit Dy added to the system using GBD were greater than magnets with Dy incorporated during sintering. Inclusions of Cu were not found to be beneficial to the system.

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Silva, Bruno Ferreira Antunes da. "Preparação de ímãs híbridos aglomerados com mistura de pós a base de TR-Fe-B e ferrite." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-29052013-075721/.

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Ímãs híbridos aglomerados foram preparados por compactação uniaxial de pós magnéticos e curados ao ar e sob vácuo. Correlações entre tratamentos de cura, propriedades mecânicas e propriedades magnéticas foram estabelecidas com base em resultados obtidos por Histeresigrafia, Magnetometria de Amostra Vibrante, ensaios de Compressão e análises de Microscopia Óptica e Eletrônica de Varredura. Parâmetros como pressão de compactação, tempo e influência da temperatura e da atmosfera de cura nas propriedades mecânicas e magnéticas de ímãs aglomerados utilizados como padrão de referência, preparados com pós MQEP de NdFeB (partículas magnéticas impregnadas com resina epóxi), foram discutidos na primeira parte deste trabalho. A melhor condição de cura foi à temperatura de 200°C por cinco horas, sob vácuo. O produto de energia máximo (BHMáx) obtido para os ímãs padrão, curados ao ar e sob vácuo, foi de 76,2 KJ/m³ e 80,5 KJ/m³, respectivamente. Na segunda parte deste trabalho, ímãs híbridos foram produzidos a partir da mistura do pó MQEP aditivado com diferentes quantidades de pós de ferrite de estrôncio e NdFeB reprocessado por HDDR. O melhor resultado de BHMáx obtido para os ímãs híbridos de MQEP com ferrite de estrôncio e MQEP com pó reprocessado por HDDR, curados sob vácuo, foi de 73,2 KJ/m³ e 78,3 kJ/m³, respectivamente. Ímãs híbridos de MQEP com pó reprocessado por HDDR apresentaram melhor desempenho magnético que os ímãs híbridos de MQEP com pós de ferrite de estrôncio.
Bonded hybrid magnets were prepared by uniaxial pressing of magnetic powders cured in air and under vacuum. Correlations between cure treatments, mechanical properties and magnetic properties were established based on results obtained by Hysteresigraphy, Vibrating Sample Magnetometry, Compression tests, Optical Microscopy and Scanning Electron Microscopy. Parameters such as compaction pressure and the influence of time, temperature and atmosphere during the curing step in the mechanical and magnetic properties of the bonded magnets used as reference patterns, produced with NdFeB MQEP powder (epoxy encapsulated magnetic particles) were discussed in the first part of this work. The better cure condition was that performed at 200 oC for 5 hours under vacuum. The maximum energy product (BHMax) obtained for the patterns bonded magnets cured in air and under vacuum was 76.2 KJ/m³ and 80.5 KJ/m³, respectively. In the second part of this work, hybrid bonded magnets were produced by the mixture of MQEP powder with different amounts of strontium ferrite powder and NdFeB powder reprocessed by HDDR. The best results of BHMax obtained for the hybrid MQEP magnets with strontium ferrite powder and NdFeB reprocessed by HDDR, cured under vacuum were 73.2 KJ/m³ and 78.3 kJ/m³, respectively. Hybrid MQEP bonded magnets produced with the addition of HDDR reprocessed powder presented better magnetic performance than that obtained with strontium ferrite powders.

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6

Ciuta, Georgeta. "Une étude expérimentale de la coercivité des aimants NdFeB." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952842.

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Les processus d'aimantation dans des aimants de type NdFeB ont été étudiés dans le cadre de cette thèse, sur la base de mesures d'aimantation macroscopiques et de caractérisations locales (MFM). Deux types d'échantillons ont été analysés : des aimants massifs dont les propriétés excellentes résultent d'un processus d'infiltration de NdCu le long des joints de grain (échantillons fournis par Toyota Motor Corporation) et des échantillons sous forme de couches épaisses, dont les microstructures, et, de ce fait les propriétés magnétiques, diffèrent. La variation thermique du champ coercitif et celle du volume d'activation ont été analysées dans le cadre de deux modèles, respectivement dénommé micromagnétique et global. Les valeurs déduites des deux paramètres principaux caractérisant la coercitivité (N représentant les effets du champ démagnétisant et α reliant le champ coercitif aux propriétés magnétiques intrinsèques de la phase dure) indiquent que dans les aimants massifs les différences de coercitivité entre échantillons sont dues pour l'essentiel à la variation de N alors que dans les films, c'est la variation du paramètre α qui joue le rôle principal. Le volume d'activation à une température donnée, dérivé de mesures de trainage magnétique, a des valeurs proches pour tous les échantillons massifs. Au contraire, il varie d'un échantillon à l'autre dans le cas des films : plus le champ coercitif est fort, plus petit est le volume d'activation. Une conclusion générale de cette étude est que les propriétés magnétiques au sein du volume d'activation sont proches de celles de la phase dure Nd2Fe14B. Le lien entre microstructure et coercivité a été examiné dans les films épais par microscopie de force magnétique (MFM). Des observations de films dans différents états rémanents le long du cycle d'hystérésis ont été réalisées. Des " domaines d'interactions " ont été révélés dans les films de faible coercitivté. Dans de tels films, comme dans ceux de coercitivité moyenne, le renversement d'aimantation est dominé par la propagation de domaines, alors que dans les films de plus forte coercitivité, la nucléation suivie de la propagation de domaines d'orientation inverse à celle de l'aimantation principale dominent.

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Adrwish, Salahadin Muhammed Ali. "The processing and characterisation of recycled NdFeB based magnets." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4122/.

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The scrap magnets were turned into a powder using the HD process. The powder was milled for specific times and sintered for 1-3hrs at 1090 °C. The magnet samples were measured using a permeameter to determine their magnetic properties. Cross sections of these samples were then mounted in bakelite and subject to metallographic studies using SEM analysis by means of Joel6060 and 7000. Some of the recycled magnets did achieve magnetic properties close to the starting magnets. It was shown that the nature of the starting magnets determines the appropriate sintering conditions during recycling. Sintering for 3hrs was good for magnets with high oxygen content but too long for fresh material and magnets with lower oxygen content, as indicated by the dilatometer measurements. Some magnets were studied further due to a lean rare content. These were treated with various heat treatments and other techniques (e.g. grain boundary diffusion) and the addition of various additives such as Dy, Co, Nd, Nband Tb. A study of how reactive recycled magnets in 3% salt-bath (Sodium Chloride NaCI) compared with starting magnets. The corrosion study was conducted over 30 weeks where results had indicated that recycled magnets have better corrosion resistance than the original material. This was due mainly to the shape of the magnets and the magnets being anisotropic, where there is a concentration of corrosion sites on the poles. The corrosion initiated at the Nd rich phase where it propagates further as time goes on. Furthermore, the magnetic properties decrease over the period, as expected. An investigation was made into the use of scrap magnetic powder in bonded magnets using tin as binder was also undertaken.

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Herraiz, Lalana Enrique. "Production of sintered NdFeB magnets from scrap alloy powders." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7609/.

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Rare earth metals are at highest supply risk of all metals for clean technologies due to supply restrictions. Rare earth elements are essential for the highest energy permanent magnets which are used in high-tech green applications such as wind turbines and electric motors. This rare earth 'crisis' has been addressed by many authors by reducing or substituting the rare earths for less critical elements. The focus of this thesis, however, is on recycling of rare earth magnetic materials. Previous work has been focused on recycling NdFeB by re-sintering and blending alloying elements to improve the final magnetic properties. However, none of these studies have addressed the systematic addition of alloying elements or the particle size effect on the final magnetic performance of the recycled magnet. The work in this thesis is aimed at maximising the magnetic performance of recycled NdFeB magnets by investigating the effect of the manufacturing route and the influence of adding alloying elements. Uncoated end-of-life sintered NdFeB were exposed to hydrogen at room temperature to break them down into a friable powder; which was then milled, sieved, aligned, pressed and sintered into recycled magnets. The resulting magnets were tested on a permeameter at room temperature, 75 and 150oc to measure the magnetic properties. Scanning electron microscopy was used to assess the microstructures. Mechanical properties such as Vickers hardness and fracture toughness were also studied.

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Sheridan, Richard Stuart. "Optimisation of HDDR processing parameters of sintered NDFEB magnets." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4929/.

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In recent years rare earth metals have hit the headlines due to supply restrictions of neodymium and dysprosium from the main supplier China. The work in this thesis investigates the possibility of recycling sintered NdFeB-type magnets using a combination of hydrogen decrepitation (HD) and the HDDR process (Hydrogenation Disproportionation Desorption and Recombination). In this work the development of microstructure during the HDDR process has been identified and the route taken by hydrogen during absorption and desorption. The microstructure and magnetic properties have been shown to be affected by the process temperature, disproportionation pressure and recombination pressure and time. Sample batches up to 100g exhibit little variation in magnetic properties however 400g batches result in large variations partially due to incomplete recombination. By increasing the disproportionation pressure it was possible to simultaneously process mixed scrap feeds with different Dy and Co levels, however a large variation in magnetic properties was also observed. Optimal processing of sintered Nd\(_{13.4}\)Dy\(_{0.7}\)Fe\(_{78.6}\)Al\(_{0.7}\)Nb\(_{0.4}\)B\(_{6.3}\) was performed by in-situ HD followed by HDDR at 880\(^o\)C with a disproportionation pressure of 1500mbar and recombination under vacuum. The resultant powder exhibited a remanence of 1.08 T, coercivity of 840 kAm\(^{-1}\) and maximum energy product of 178 kJm\(^{-3}\).

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10

Elwert, Tobias [Verfasser]. "Entwicklung eines hydrometallurgischen Recyclingverfahrens für NdFeB-Magnete / Tobias Elwert." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2015. http://d-nb.info/1070920673/34.

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Books on the topic "NdFeB"

1

Wilson, Andrew Frederick. The production of NdFeB permanent magnets. Birmingham: University of Birmingham, 1995.

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Mokal, Beljeet S. The production and characterisation of PTFE-bonded NdFeB magnets. Birmingham: University of Birmingham, 1998.

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3

Pollard, Robert James. The microstructure and magnetic properties of NdFeB based permanent magnets. Salford: University of Salford, 1989.

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Williams, Andrew J. Hydrogen absorption and desorption studies on NdFeB type alloys used for the production of permanent magnets. Birmingham: University of Birmingham, 1994.

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5

Namburi, Eswara Prasad, R. J. H. Wanhill, and Dipak Kumar Setua, eds. Novel Defence Functional and Engineering Materials (NDFEM) Volume 2. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9795-4.

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Namburi, Eswara Prasad, R. J. H. Wanhill, and Dipak Kumar Setua, eds. Novel Defence Functional and Engineering Materials (NDFEM) Volume 1. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9791-6.

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San Francisco (Calif.). Solid Waste Management Program., ed. City and County of San Francisco nondisposal facility element (NDFE): [draft]. [San Francisco: The City, 1994.

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Hafez, Ahmad, and Scholars Dental. Basic Science Review for Dental Board Exams and NDEB Canada Exams: Prepare for the NDEB AFK Exam, INBDE Exam, Dental Assistant Exams, Dental Hygiene Exams, MFDS Exams and Any Dental Board Exam. Independently Published, 2020.

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Book chapters on the topic "NdFeB"

1

Chamberod, A., and F. Vanoni. "NdFeB Magnets by Melt Spinning." In Concerted European Action on Magnets (CEAM), 436–48. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1135-2_38.

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Gutfleisch, O., G. Drazic, C. Mishima, and Y. Honkura. "Anisotropy Mechanism in HDDR Processed NdFeB." In Bonded Magnets, 37–44. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1090-0_3.

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Folks, L., R. C. Woodward, K. L. Babcock, and R. Street. "Magnetic Force Microscopy of Sintered NdFeB." In Magnetic Hysteresis in Novel Magnetic Materials, 215–19. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_21.

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Cartocetti, A. "Preparation and Characterisation of Sintered NdFeB Magnets." In Concerted European Action on Magnets (CEAM), 581. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1135-2_51.

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Wu, Chen, and Jiaying Jin. "Rare-Earth-Based Hard Magnetic Materials: NdFeB." In Frontiers in Magnetic Materials, 101–28. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003216346-9.

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Sattelberger, S., and R. Hähn. "The Preparation of Neodymium-Metal and NdFeB-Alloys." In Concerted European Action on Magnets (CEAM), 480–88. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1135-2_42.

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Cannesan, N., and I. R. Harris. "Aspects of NdFeB HDDR Powders: Fundamentals and Processing." In Bonded Magnets, 13–36. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1090-0_2.

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Dulis, Edward J., and Vijay K. Chandhok. "Solid NdFeB Magnets Made by Gas Atomization and Extrusion." In NATO ASI Series, 599–606. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2590-9_67.

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Li, Li, Dong Wang, Zong Wei Niu, Zhi Yong Li, and Guang Ming Yuan. "Ultrasonic Machining Aided Tool Rotation of Sintered NdFeB Magnet." In Advances in Grinding and Abrasive Technology XIV, 420–24. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-459-6.420.

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Grundy, P. J., D. G. Lord, S. F. H. Parker, and R. J. Pollard. "The Microstructure and Extrinsic Magnetic Properties of NdFeB-Based Materials." In Concerted European Action on Magnets (CEAM), 405–17. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1135-2_35.

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Conference papers on the topic "NdFeB"

1

Sarriegui, G., E. Urionabarrenetxea, P. Ortega, N. Burgos, J. M. Martín, I. Eguren, and G. Ugalde. "Short-Loop Recycling Of Nd-Fe-B Scrap By Gas Atomization." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235765357.

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In this work, it is presented a direct metallurgical route for the recycling of end-of-life (EoL) sintered NdFeB magnets to produce competitive bonded magnets. Three different grades of scrap, classified according to the total content of heavy rare earth elements, were converted into fresh recycled NdFeB powder by gas atomization. Several atomizations with helium (He) and argon (Ar) were conducted to produce isotropic spherical powders. The use of He as atomizing gas resulted in higher cooling rates and, thus, finer and almost fully amorphous particles. After proper annealing, the powder exhibited a greater improvement in magnetic properties. Laboratory specimens were produced by compression molding using an epoxy resin as bonding phase. The magnetic, mechanical and physical characterization of the bonded NdFeB recycled magnets confirm that gas atomization is a feasible process for recycling NdFeB scrap.

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Mitchell, P. "Corrosion protection of NdFeB magnets." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734474.

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Zheng, Pan, Mohammad Kilani, Yousef S. Haik, and Ching-Jen Chen. "Fabrication of NdFeB Thin Film and Its Application in MEMS." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33401.

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The paper measures the magnetic properties of NdFeB thin films developed under the effects of magnetic field. The samples exhibited a larger residual inductance, saturation magnetization and energy product than those treated without field or with weaker field. Magnetic MEMS was introduced with application of the NdFeB film to micro device such as pumps and gear transmission system.

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McGuiness, P. J., A. J. Williams, I. R. Harris, E. Rozendaal, and J. Ormerod. "Vacuum sintering behaviour of NdFeB magnets." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690168.

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Clegg, A. G., I. M. Coulson, and H. Y. Wong. "The temperature stability of NdFeB magnets." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734477.

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Vollert, Florian, and Johannes Maurath. "Production of NdFeB magnets by Metal Injection Molding (MIM) – Challenges and Chances." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235753675.

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NdFeB magnets show the highest energy products of all known magnetic materials. It is predicted that the demand for this kind of magnets will increase in the following years significantly. However, the required rare earth elements are almost exclusively produced in China. To reduce this dependency the recycling, but also the production of NdFeB magnets in Europe is becoming more and more interesting. In the last few years, MIMplus has developed a process to produce NdFeB magnets from either virgin or recycling material by means of Metal Injection Molding (MIM). In contrast to the conventional production route via press sintering, MIM allows a high level of design freedom (complex shapes and complex magnetization) with comparable magnetic properties. Currently up to magnet grades of N42. The focus on this work is a review of the different challenges that exist for this new production method in order to achieve the state-of-the-art magnetic properties from press sintering.

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Miki, S., T. Fujita, T. Kotoge, Y. G. Jiang, M. Uehara, K. Kanda, K. Higuchi, and K. Maenaka. "Electromagnetic energy harvester by using buried NdFeB." In 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2012. http://dx.doi.org/10.1109/memsys.2012.6170409.

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Maizelis, Antonina, and Boris Bairachniy. "Protection of NdFeB Magnets by Multilayer Coating." In 2019 IEEE 39th International Conference on Electronics and Nanotechnology (ELNANO). IEEE, 2019. http://dx.doi.org/10.1109/elnano.2019.8783526.

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Chen, Zhi Hua, Jun Quan Chen, Si Wei Cheng, You Xing Xiong, and Kun Wei. "Study on quantitative pulse magnetization of NdFeB." In 2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD). IEEE, 2015. http://dx.doi.org/10.1109/asemd.2015.7453628.

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Wang, Shuo, Yong Zhao, Wenhui Yu, Fei Gao, Zhuji Jin, Hongyu Zheng, and Jiang Guo. "Laser processing of NdFeB micro-array structure." In 2022 8th International Conference on Nanomanufacturing & 4th AET Symposium on ACSM and Digital Manufacturing (Nanoman-AETS). IEEE, 2022. http://dx.doi.org/10.1109/nanoman-aets56035.2022.10119518.

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Reports on the topic "NdFeB"

1

Skone, Timothy J. NdFeB Permanent Magnet Manufacturing. Office of Scientific and Technical Information (OSTI), July 2014. http://dx.doi.org/10.2172/1509107.

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2

Crew, D. C., L. H. Lewis, P. G. McCormick, R. Street, and V. Panchanathan. Magnetization reversal in melt-quenched NdFeB. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/350917.

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Xu, Yanchen. Liquid metal extraction of Nd from NdFeB magnet scrap. Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/754780.

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Nguyen, T. D., K. M. Krishnan, L. H. Lewis, Y. Zhu, and D. O. Welch. Microstructure and composition in rapidly-quenched NdFeB-based hard magnet alloys. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/132748.

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Paranthaman, M. Parans. CRADA/NFE-15-05761 Report: Additive Manufacturing of Isotropic NdFeB Bonded Permanent Magnets. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1287037.

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LI, DIEN. FUNCTIONALIZED MESOPOROUS CARBON MATERIALS FOR EFFECTIVE RECOVERY OF RARE EARTH ELEMENTS FROM NDFEB MAGNET SCRAP. Office of Scientific and Technical Information (OSTI), February 2023. http://dx.doi.org/10.2172/1958205.

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