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Tesis sobre el tema "Neodymium magnets"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 26 de julio de 2025

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1

Klešč, Tania. "Neodimio magnetų eksperimentinis tyrimas." Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130821_115730-10514.

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Bakalauro darbą „ Neodimio magnetų eksperimentinis tyrimas“ sudaro įvadas, keturi skyriai, išvados, priedai ir literatūros sąrašas. Šio darbo apimtis 30 puslapių. Darbe yra 26 paveikslėliai ir 1 lentelė.Įvade iškeliama darbo problema, tikslai ir uždaviniai. Pirmajame skyriuje pateikta literatūros analizė. Antrajame skyriuje aprašoma eksperimento metodika. Trečiajame skyriuje pateikti sistemų su neodimio magnetais tyrimo rezultatai. Ketvirtajame skyriuje pateikta eksperimento rezultatų analizė. Darbo pabaigoje pateiktos išvados apibendrinančios atliktą darbą ir pateikti pasiūlymai, kur būtų gal

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2

DAMENTO, MICHAEL ANTHONY. "DETECTION OF MAGNETIZATION REVERSAL IN A NEODYMIUM-IRON-BORON MAGNET USING A HALL-EFFECT MICROPROBE." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183945.

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Magnetization processes in a sintered Nd-Fe-B permanent magnet (NEOMAX-35) were examined on a small scale using a Hall-effect microprobe with an active area 75 μm on a side. Probes were made by evaporating bismuth through a stencil mask onto glass slides. Experiments were performed by placing a probe onto the polished pole face of a Nd-Fe-B magnet and inserting the probe-magnet assembly into an electromagnet. Barkhausen steps, indicating rapid domain wall motion, were observed (superimposed upon the blank probe signal) in the demagnetization of a fully magnetized magnet. Magnetization traces f

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3

Jubb, Gary Anthony. "Production and properties of neodymium-iron-boron permanent magnets." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236470.

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4

Wang, Zhiran. "The demagnetising factors for bonded neodymium iron boron (NdFeB) magnets." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340145.

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5

Attanasio, Steven A. 1967. "Corrosion and environmentally-assisted cracking of rapidly solidified neodymium-iron-boron permanent magnets." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39748.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.<br>Vita.<br>Includes bibliographical references (p. 383-388).<br>by Steven A. Attanasio.<br>Ph.D.

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6

Meakin, Jonathan Philip. "Development of a pilot scale strip casting system to produce optimised alloys for neodymium-iron-boron magnets." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6791/.

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Strip casting is a rapid processing technique used in the production of alloys for both sintered and HDDR bonded NdFeB magnets. During strip casting, molten alloys are gravity fed onto a rotating copper wheel. The rapid cooling rate produces NdFeB microstructures which have many advantages over conventionally cast NdFeB book-mould alloys such as less alpha iron, near stoichiometric alloy compositions and a finer grain structure. The wheel texture of a pilot scale strip caster was altered in order to optimize the microstructure and improve the consistency of strip cast flakes for the production

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7

OLIVEIRA, MARA C. L. de. "Estudo da influencia do campo magnetico na resistencia a corrosao em imas permanentes de Nd=Fe-B." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11214.

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8

MENDES, NETO TEOFILO. "Estudo microestrutural e propriedades magnéticas em imãs permanentes sinterizados à base de PrFeCoBNb com adições de elementos de liga." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9992.

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9

MARTINS, EMERSON A. "Avaliacao do efeito de tratamentos superficiais na resistencia a corrosao de magnetos de Nd-Fe-B." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9404.

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10

SILVA, BRUNO F. A. da. "Preparação de ímãs híbridos aglomerados com mistura de pós a base de TR-Fe-B e ferrite." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10532.

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11

Welzel, Lisa. "End-Of-Life Wind Turbines in the EU : An Estimation of the NdFeB-Magnets and Containing Rare Earth Elements in the Anthropogenic Stock of Germany and Denmark." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394910.

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Securing rare earth elements (REE) for a stable supply require sustainable management strategies in Europe due to a missing local primary production and a dependence on China as the main producer of REE. These elements, like neodymium (Nd) and dysprosium (Dy), are contained in permanent magnets (PM) (mostly NdFeB-magnets) in wind turbines. Addressing the question whether PM-material, Nd- and Dy-contents from wind turbines could help to meet future demands of REE in Europe while reducing simultaneously the import dependence, the purpose of the present work was to analyze the urban mining opport

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12

SALIBA, SILVA ADONIS M. "Desenvolvimento de um processo de fosfatacao para protecao anticorrosiva em imas NdFeb." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10975.

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13

Ben, messaoud Yethreb. "Modélisation analytique du couplage multi-physique magnétique-thermique dans la phase de préconception d'un système mécatronique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC079/document.

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Durant la phase de conception, les différentes équipes d’ingénierie procèdent à de multiples simulations par éléments finis traitant les comportements physiques variés afin d’assurer la vérification et la validation.Cependant, les résultats insatisfaisants engendrent des changements tardifs et par conséquent de longues itérations et des coûts croissants.Pour répondre à cette problématique, il est essentiel de prendre en considération les contraintes géométriques et multi-physiques dès la phase de préconception.En effet, un processus appelé SAMOS est développé visant à sélectionner l’architectu

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14

Burton, Nicholas. "X-ray magnetic scattering from neodymium metal." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396458.

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15

Knebl, Ladislav. "Návrh synchronního reluktančního motoru s permanentními magnety." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318197.

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V dnešní době je kladen vysoký nárok na účinnost elektrických zařízení a to jak ze strany provozovatele, tak i legislativy. Nejlepší účinnosti dosahují synchronní motory s permanentními magnety umístěnými na povrchu rotoru (SMPM), se kterými lze i u malých motorů dosáhnout účinnosti nad 90%. Nicméně tyto motory jsou z důvodů použití magnetů ze vzácných zemin, např. NdFeB, drahé a jsou schopny provozu pouze s frekvenčním měničem. Z cenových důvodů jsou hledány levnější alternativy k SMPM motorům. Jedním z typů motorů, kterým lze SMPM nahradit je synchronní reluktanční motor s permanentními magn

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16

Wang, Huabin 1969. "The magnetic properties, crystal and magnetic structures of Nd5SixGe4-x /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101661.

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The magnetic properties, crystal and magnetic structures of Nd5 SixGe4-x were investigated by ac susceptibility and high resolution neutron powder diffraction. The magnetic and crystalline phase diagrams were derived. Four distinct structures exist in the Nd 5SixGe4-x system: Gd5Ge 4-type [O(II)], Gd5Si2Ge2-type (M), Gd5Si4-type [O(I)], and Zr5Si4-type (T). The refinements of the neutron powder diffraction patterns revealed that the Nd5SixGe4-x compounds exhibit mixed ferro-antiferromagnetic structures. The ac susceptibility measurements showed that the magnetic ordering temperature of Nd5SixG

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17

Bothamy, Nina. "Fractionnement anthropique et naturel des isotopes stables du néodyme (Nd) dans l'environnement." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0295.

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Avec une utilisation mondiale croissante pour des applications variées (nouvelles technologies, énergies vertes, etc.), les terres rares (REEs pour ‘rare earth elements’) sont devenues des polluants émergents. Ces pollutions peuvent/pourront être d’origine industrielle (ex. rejets dans l’environnement en sortie d’usine), minière, ou causées par le stockage inapproprié de produits industriels (ex. aimants à base de néodyme (Nd) fragiles à la corrosion). Dans ce contexte, ce projet de thèse a cherché à développer un nouvel outil : l’étude du fractionnement dépendant de la masse des isotopes du N

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18

Yapp, Rachel. "The influence of cobalt and other variables on the properties of melt spun neodymium iron boron based magnetic alloys." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267113.

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19

Fujita, Akira. "A study on magnetic anisotropy induced in the HDDR process." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343855.

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20

Wehrenberg, Christopher. "Phase transformations in shock compacted magnetic materials." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43595.

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Shock compaction experiments were performed on soft magnetic phases Fe₄N and Fe₁₆N₂, and hard magnetic phases Nd₂Fe₁₄B and Sm₂Fe₁₇N₃ in order to determine their thermo-mechanical stability during shock loading and explore the possibility of fabricating a textured nanocomposite magnet. Gas gun experiments performed on powders pressed in a three capsule fixture showed phase transformations occurring in Fe₄N, Fe₁₆N₂, and Nd₂Fe₁₄B, while Sm₂Fe₁₇N₃ was observed to be relatively stable. Shock compaction of FCC Fe₄N resulted in a partial transformation to HCP Fe₃N, consistent with previous reports of

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21

Borges, Danilo da Silva. "UM ESTUDO SOBRE A INJEÃÃO DE FIOS MAGNÃTICOS EM CAVIDADES." Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=17610.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>No presente trabalho realizamos uma sÃrie de experimentos acerca do processo de injeÃÃo de um fio magÃtico no interior de uma cavidade circular rı́gida com o objetivo de obter uma melhor compreensÃo sobre as caracterı́sticas das morfologias geradas dependendo das condiÃÃes inici- ais. Nossos resultados indicam a possibilidade de formaÃÃo de duas morfologias que apresentam caracterı́sticas bastante distintas. Quando os dois fios injetados em posiÃÃes diametralmente opostos na cavidade apresentam dipol

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22

Braconi, Dario. "Green two-wheeled mobility : Material Hygiene and life cycle analysis of anelectric scooter." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157045.

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In the last years electric vehicles gained importance as a more sustainable alternative to traditional vehicles. The introduction of an electric powertrain leads to lower air-pollution emissions but it also involves the introduction of new materials in the product life cycle, e. g., the rare earths and lithium contained in the motor and in the batteries. Those materials have an environmental impact and they need to be disposed properly. The aim of this thesis is to have a quantitative knowledge of the environmental balance linked to the use of a different powertrain. Furthermore, this study ex

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23

Marashi, Seyed Pirooz Hoveida. "Transmission electron microscopy study of nanostructured Nd-Fe-B hard magnetic materials." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366102.

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24

Courtois, Pierre. "Elaboration en creuset froid sous champ magnétique intense de quelques matériaux magnétiques en vue de leur texturation." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10124.

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Un creuset froid inductif a ete mis en place sous champ magnetique intense. Ce dispositif permet d'appliquer au cours de la solidification de materiaux tres reactifs un champ magnetique homogene ou inhomogene dans l'espace. Il permet egalement de realiser la levitation stabilisee par courants de foucault d'alliages metalliques liquides paramagnetiques. De nombreuses applications sont ouvertes dans le domaine de l'elaboration de materiaux ultra-purs. Nd#2fe#1#4b est le compose le plus utilise a la fabrication d'aimants permanents performants. Les conditions de texturation de ce compose par soli

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25

Guidetti, Giulia. "Cellulose photonics : designing functionality and optical appearance of natural materials." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277918.

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Cellulose is the most abundant biopolymer on Earth as it is found in every plant cell wall; therefore, it represents one of the most promising natural resources for the fabrication of sustainable materials. In plants, cellulose is mainly used for structural integrity, however, some species organise cellulose in helicoidal nano-architectures generating strong iridescent colours. Recent research has shown that cellulose nanocrystals, CNCs, isolated from natural fibres, can spontaneously self-assemble into architectures that resemble the one producing colouration in plants. Therefore, CNCs are an

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26

GUILHERME, ENEIDA da G. "Preparacao de materiais magneticamente duros a base de ligas de terra rara-ferro nitrogenadas." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10786.

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27

Sanchez, Renato Sartori Lardin. "Avaliação da força de repulsão entre magnetos de neodímeo ferro boro usados em tratamentos intra e extra bucais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23152/tde-08052012-162521/.

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Os magnetos de Neodímio Ferro Boro (Nd2Fe14B) apresentam excelentes propriedades magnéticas e compatibilidade biológica, embora sejam frágeis e possuam baixa resistência à corrosão. As forças de atração magnética de magnetos de terras raras têm sido empregadas em sistemas de retenção, principalmente associadas aos implantes osseointegráveis, em próteses bucais e próteses faciais, bem como em aparelhos ortodônticos. Este estudo avalia o comportamento das forças de repulsão magnética, em função do volume e comprimento do eixo magnético, quando submetidos a afastamentos, de modo que esta propried

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28

Delamare, José. "Etude microstructurale d'alliages Nd-Fe et Nd-Fe-Al : corrélation aux phases secondaires des aimants Nd-Fe-B." Rouen, 1992. http://www.theses.fr/1992ROUES058.

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La microstructure d'un alliage eutectique Nd-Fe a été étudiée grâce à la microscopie électronique à transmission. Il apparaît que le composé métastable A1 est constitué de deux composés nanocristallins, dont les compositions sont proches de Nd20Fe80 et Nd40Fe60 (% at. ). L'origine de la formation de tels composés est interprétée dans un diagramme de phases binaire métastable, incluant la phase NdFe2. Les caractéristiques structurales des autres phases du système binaire sont également étudiées. L'addition d'aluminium aux alliages Nd-Fe dont la composition est riche en Nd modifie drastiquement

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29

Süptitz, Ralph. "Einfluss homogener und inhomogener Magnetfelder auf die Korrosion ferromagnetischer Elektroden." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-84255.

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Im Rahmen der vorliegenden Arbeit konnten Einflüsse magnetischer Felder, insbesondere mit hohen Gradienten der magnetischen Flussdichte, auf Korrosionsprozesse am Beispiel Eisen quantifiziert und deren Wirkungsmechanismus erklärt werden. Als ein besonders in technisch relevanten gering konzentrierten sauren wässrigen Lösungen bedeutsamer Effekt wurde eine sekundäre Wirkung der Feldgradientenkraft über den Mechanismus der Wahrung der Ladungsneutralität auf den pH-Wert an der Elektrodenoberfläche identifiziert. Somit konnte ein signifikanter Magnetfeldeinfluss auf die formal ladungstransferkontr

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30

Ball, Andrew. "Commensurabilité magnétique à longue période et anisotropie dans la série hexagonale RGa2 (R=Pr, Nd, Gd)." Grenoble 1, 1993. http://www.theses.fr/1993GRE10075.

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Les composes hexagonaux simples rga(r=gd, pr et nd) sont d'excellents candidats pour l'etude de structures magnetiques frustrees complexes resultant des interactions d'echange a longue portee. Par l'utilisation de techniques experimentales variees, nous avons mis en evidence sur ces composes des proprietes magnetiques originales et hautement complexes. Dans le cas de gdga#2, un champ magnetique induit des changements subtils dans la configuration antiphase incommensurable de la phase en champ nul. Ces processus peuvent se resumer en trois diagrammes de phases champ-temperature d'une complexite

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31

Le, Breton Jean-Marie. "Etude par spectrométrie Mössbauer de la corrosion d'alliages métalliques : aimants permanents Nd-Fe-B ; acier faiblement allié en eau de mer naturelle." Rouen, 1992. http://www.theses.fr/1992ROUES050.

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La spectrométrie Mössbauer du fer 57 a été utilisée en relation avec d'autres techniques (diffractions de rayons X, microscopie électronique à balayage, microsonde électronique) pour étudier la corrosion d'aimants permanents industriels Nd-Fe-B entre 90°C (avec humidité) et 400°C, et d'un acier faiblement allié (42CD4) en eau de mer naturelle en fonction de la pression hydrostatique. Dans les aimants Nd-Fe-B, l'évolution de la phase Nd2Fe1#4B a été plus particulièrement suivie. Cette phase semble disparaître sous l'effet de l'oxydation du Nd, en formant principalement du fer alpha. Un net rale

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32

Ravach, Gwennola. "Etude structurale, magnétique et thermique de rubans amorphes Fe-Tr-B (Tr, Nd, Ho, Dy) à anisotropie magnétique aléatoire." Rouen, 1997. http://www.theses.fr/1997ROUES056.

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Les alliages amorphes métal de transition-terre rare peuvent présenter de l'anisotropie magnétique aléatoire due au désordre structural et au couplage spin-orbite de la terre rare. Les propriétés structurales et magnétiques de rubans amorphes hypertrempés Fe80-xTrxB20 (Tr = Nd, Ho, Dy ; x 16 % at. ) Ont été étudiées par spectrométrie Mössbauer, spectroscopie d'absorption X, analyse thermique différentielle et diffraction X aux grands angles. On montre par Mössbauer que les propriétés structurales des alliages ne dépendent pas de la nature de la terre rare. Une discontinuité des variations des

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33

Narayan, Shashi Prakash. "The Effect Of Strain Rate And Temperature On The Development Of Magnetic Properties In Nano Crystalline Nd-Fe-B Alloy." Thesis, 1997. https://etd.iisc.ac.in/handle/2005/2137.

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Narayan, Shashi Prakash. "The Effect Of Strain Rate And Temperature On The Development Of Magnetic Properties In Nano Crystalline Nd-Fe-B Alloy." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/2137.

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35

Li, Po-Liang, and 李柏樑. "Neodymium Magnet Modular Robot Having Configuration Recognition Capability." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/59372907356159676982.

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碩士<br>修平科技大學<br>電機工程碩士班<br>102<br>In this thesis, design and control of the modular robot are discussed. The Modular robot is made of a set of robotic modules with the ability to change the shape by having cooperation among the multiple robot modules. In these designed modular robots, they comprise several modules individually with actuators controlled by their own on-board processing units, and these individual modules have the basic motion capability and control functions. Based on the optical sensors mounted on the connected faces of the modular robot can provide the relative position infor

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Liu, Yi-Hsien, and 劉宜憲. "Recovery of Neodymium from Waste Permanent Magnet by Support Liquid Membrane System and Develop High Quality Photocatalyst." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/00500478746231323377.

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碩士<br>中原大學<br>環境工程學系<br>105<br>Neodymium (Nd) is a rare earth element (REE) that is also found in waste permanent magnets (WPMs). Permanent magnets (PMs) play an important role in manufacturing products as their demand is crucial in emerging countries such as Taiwan. Removing these waste products as well as enhancing the quality is very important for the recovery of these rare earth metals.The aim of the study is to recover and recycle Neodymium from waste permanent magnets (WPMs) by using a supported liquid membrane with strip dispersion (SLMSD) module with hollow fiber membrane. Thereafter,

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(9852800), Athira N. Surendran. "Development of Fabrication Platform for Microfluidic Devices and Experimental Study of Magnetic Mixing and Separation." Thesis, 2020.

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<div> <div> <div> <p>Microfluidics is a new and emerging field that has applications in a myriad of microfluidic industrial applications such as biochemical engineering, analytical processing, biomedical engineering and separation of cells. Microfluidics operations are carried out in microfluidic chips, and the traditional method of fabrication is carried out in a cleanroom. However, this fabrication method is very costly and also requires professional trained personnel. In this thesis, a low-cost fabrication platform was developed based on soft-lithography technique developed to fabricate the

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Süptitz, Ralph. "Einfluss homogener und inhomogener Magnetfelder auf die Korrosion ferromagnetischer Elektroden." Doctoral thesis, 2011. https://tud.qucosa.de/id/qucosa%3A25929.

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Im Rahmen der vorliegenden Arbeit konnten Einflüsse magnetischer Felder, insbesondere mit hohen Gradienten der magnetischen Flussdichte, auf Korrosionsprozesse am Beispiel Eisen quantifiziert und deren Wirkungsmechanismus erklärt werden. Als ein besonders in technisch relevanten gering konzentrierten sauren wässrigen Lösungen bedeutsamer Effekt wurde eine sekundäre Wirkung der Feldgradientenkraft über den Mechanismus der Wahrung der Ladungsneutralität auf den pH-Wert an der Elektrodenoberfläche identifiziert. Somit konnte ein signifikanter Magnetfeldeinfluss auf die formal ladungstransferkontr

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