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Dissertations / Theses on the topic 'Iron-cobalt alloys'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Ved, M. V., N. D. Sakhnenko, M. A. Glushkova, and A. V. Karakurkchi. "Nanostructured cobalt and iron electrodeposited alloys." Thesis, Springer Science+Business Media, Inc, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22646.

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2

Huang, Qianwen. "Electrodeposition of Amorphous Alloys: Nickel Cobalt Phosphorus and Iron Phosphorus." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1465574470.

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3

Atamert, Serdar. "Stability, wear resistance, and microstructure of iron, cobalt and nickel-based hardfacing alloys." Thesis, University of Cambridge, 1989. https://www.repository.cam.ac.uk/handle/1810/221891.

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4

Orrock, Clive Martin. "The microstructure and properties of equiatomic iron-cobalt magnetic alloys with alloying additions." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38127.

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5

Atiq, Shabbar. "Constitution and magnetic properties of iron-cobalt based alloys containing gadolinium and terbium." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47757.

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6

Zubris, Melissa A. "Synthesis and microstructure of FeCo nanoalloys." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19014.

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7

Hao, Yalin. "Continuous Hydrothermal Production of Iron Oxide (Fe[subscript 2]0[subscript 3]) and Cobalt Oxide (Co[subscript 3]O[subscript 4])." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/11217.

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8

COUTO, ANTONIO A. "Transformacoes de fase e propriedades da liga FECO-2V." reponame:Repositório Institucional do IPEN, 1989. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10246.

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Made available in DSpace on 2014-10-09T12:36:29Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:26Z (GMT). No. of bitstreams: 1 03869.pdf: 1530426 bytes, checksum: 572e7a2dbb3cf5d7e1b444b448a01e81 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energetica e Nucleares IPEN/CNEN-SP

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9

Chapekar, Vasant Krishna. "Corrosion resistance of iron-base & cobalt-base metallic glass alloys in condensing acidic flue gas environment." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252297.

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10

Fingers, Richard Todd. "Creep Behavior Of Thin Laminates Of Iron-Cobalt Alloys For Use In Switched Reluctance Motors And Generators." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30588.

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The United States Air Force is in the process of developing magnetic bearings as well as an aircraft Integrated Power Unit and an Internal Starter/Generator for main propulsion engines. These developments are the driving force behind a new emphasis on high temperature, high strength magnetic materials for power applications. Analytical work, utilizing elasticity theory, in conjunction with design requirements, indicates a need for magnetic materials to have strengths in excess of 80 ksi up to about 1000 degrees F. It is this combination of desired material characteristics that is the motiva

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11

Williams, Melissa Ann Zubris. "Design of FeCo Nanoalloy Morphology via Control of Reaction Kinetics." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7529.

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Nanoalloys are an exciting new class of materials in the growing field of nanotechnology. Nanoalloys consist of the nanoscale co-aggregation of two or more metals with a potential to form compositionally-ordered phases or superstructures that have properties unlike those of the individual metal clusters or of bulk alloys of the constituent metals. This research seizes the opportunity that the nanoscale domain has to offer, and focuses on the synthesis of iron and cobalt nanoalloys via the simultaneous decomposition of iron cobalt organometallic precursors in a stabilizing environment, accompa

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12

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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13

Malins, Andrew E. R. "The development of a three-component electron spin polarimeter." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/33190.

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The thesis is primarily concerned with the design, construction and preliminary commissioning of a novel polarimeter for full three-dimensional analysis of electron spin polarisation. The polarimeter is described in detail, together with the theoretical basis for its operation. Studies of an amorphous ferromagnetic alloy, Co66Fe4Ni1B14Si15, and its application as a secondary standard are presented. Finally, a design study of a GaAs polarised electron source, capable of providing both longitudinal and transverse polarisations, is detailed.

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14

Goodman, Andrew M. "Magnetisation reversal in exchange biased spin-valves." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322900.

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15

Mackay, Kevin George Hamilton. "Fabrication and characterisation of high moment thin films for inductive write heads." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314178.

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16

Williams, Melissa Ann Zubris. "Design of FeCo nanoalloy morphology via control of reaction mechanisms (Chemistry)." Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11212005-165612/.

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Thesis (Ph. D.)--Materials Science and Engineering, Georgia Institute of Technology, 2006.<br>Tannenbaum, Rina, Committee Chair ; Rosario Gerhardt, Committee Member ; Hamid Garmestani, Committee Member ; Karl Jacob, Committee Member Vita. Includes bibliographical references.

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17

Koza, Jakub. "Electrocrystallisation of CoFe Alloys Under the Influence of External Homogeneous Magnetic fields." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38700.

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The iron-group metals and alloys are of interest because of their excellent soft magnetic properties. They have found a wide application field in the storage technology, especially for reading/writing elements in the hard drive head, and in microelectromechanical systems (MEMS). Especially the CoFe system, which possesses the highest, among others, saturation magnetisation of 2.45 T and a relatively low coercivity of about 2×10^-5 T, is of interest. These properties are crucial for the further development in the storage technology. Electrodeposition is a very promising alternative to the physi

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18

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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19

Krings, Andreas. "Iron Losses in Electrical Machines - Influence of Material Properties, Manufacturing Processes, and Inverter Operation." Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145243.

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As the major electricity consumer, electrical machines play a key role for global energy savings. Machine manufacturers put considerable efforts into the development of more efficient electrical machines for loss reduction and higher power density achievements. A consolidated knowledge of the occurring losses in electrical machines is a basic requirement for efficiency improvements. This thesis deals with iron losses in electrical machines. The major focus is on the influences of the stator core magnetic material due to the machine manufacturing process, temperature influences, and the impact

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20

Andrieu, Olivier. "Étude de multicouches à magnétorésistance géante de la famille NiCoFe/Ag : amélioration de la sensibilité par modification du procédé de dépot ou de la composition de la couche magnétique, en vue de la conception de capteurs magnétorésistifs." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0130.

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Les multicouches magnetoresistives ni#8#1fe#1#9/ag elaborees par pulverisation cathodique de type triode sont connues pour etre un materiau a haut potentiel d'applications. Cette these se propose d'en ameliorer les proprietes magnetoresistives par deux methodes distinctes, ceci dans le but d'utiliser ce type de materiau lors de la conception de capteurs de champ magnetique. L'une des methodes consiste a modifier la composition de la couche magnetique. Deux systemes (co#7#0fe#3#0/ag et ni#6#6co#1#8fe#1#6/ag) ont ete etudies. Les multicouches co#7#0fe#3#0/ag presentent un interet assez limite po

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21

Cowache, Christophe. "Contribution à l'étude de la magnétorésistance géante planaire et perpendiculaire dans les multicouches et alliages granulaires magnétiques." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10125.

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Nous presentons une etude des proprietes structurales, magnetiques et de transport electronique de multicouches co/cu et nife/ag ainsi que d'alliages granulaires (cofe)ag. La magnetoresistance geante de ces systemes constitue le theme principal de la these. Nous avons developpe une procedure experimentale permettant la preparation d'echantillons mesurables en geometrie perpendiculaire (cpp), dans laquelle les lignes de courant sont perpendiculaires aux interfaces entre couches. Comme attendu l'effet de magnetoresistance geante est renforce dans cette geometrie. Une modelisation semiclassique d

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22

Nik, Mohd Masdek Nik Rozlin. "Electrodeposition and corrosion study of nanocrystalline cobalt and cobalt-iron alloy coatings." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/49944.

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Nanocrystalline materials with grain sizes less than 100 nm, have attracted considerable attention due to their enhanced properties as compared to their polycrystalline counterparts. However, investigation on the corrosion resistance of these materials is still lacking. In order to further expand their future applications, their corrosion behaviour is of great importance. Hence, in this study, nanocrystalline Co and CoFe alloy coatings were prepared through the electrodeposition process and their electrochemical corrosion behaviour were investigated. Depending on the environment, the effect of

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23

De, Pauw Virginie. "Mécanismes de nitruration et d'oxydation du composé intermétallique Sm2 (Fe, Co)1#7 pour aimants permanents." Rouen, 1996. http://www.theses.fr/1996ROUES053.

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L'étude des mécanismes de nitruration du composé intermétallique Sm2 (Fe, Co)1#7 est effectuée sur des échantillons massifs à l'aide de la diffraction des rayons X et de la microscopie électronique à balayage. Nous avons utilisé deux modes de nitruration (lit fluidisé et flux gazeux) afin de comparer les processus mis en jeu lors du traitement. Des comportements différents interviennent au niveau de la distribution de l'azote dans les échantillons, des cinétiques de nitruration globale et de la couche de surface. Il apparaît que la diffusion de l'azote est principalement volumique dans le cas

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24

Dauguet, Pascale. "Développement de dispositifs de mesure de très faibles résistances à très basses températures : application à l'étude de la magnétorésistance géante des multicouches magnétiques en courant perpendiculaire aux couches." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0112.

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Le but de cette these etait l'etude experimentale de l'origine theorique tres discutee de la magnetoresistance geante des multicouches magnetiques, en particulier lorsque le courant est applique perpendiculairement au plan des couches (cpp-mr). Dans cette geometrie, les resistances des echantillons sont de l'ordre du nano-ohm au micro-ohm, et nous souhaitions voir des variations de quelques pour-cent de celles-ci avec un courant de mesure de 100 ma maximum. La sensibilite requise etait donc le pico-volt. Durant cette these, nous avons tout d'abord developpe des dispositifs experimentaux atteig

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25

Giacomoni, Laurence. "De la magnétorésistance géante à la magnétorésistance tunnel de multicouches magnétiques métalliques et métal/isolant." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10156.

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Les etudes presentees dans ce memoire concernent le transport d'electrons polarises en spin dans les multicouches magnetiques et les effets qui en decoulent : la magnetoresistance geante dans les systemes metalliques et la magnetoresistance tunnel dans les systemes metal/oxyde. La magnetoresistance geante de multicouches nife/cu est etudiee dans les deux geometries de courant (planaire et perpendiculaire aux interfaces). Dans ces systemes, l'insertion de fines couches de co aux interfaces a pour effet de modifier le couplage indirect entre couches magnetiques successives et entraine une augmen

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26

Arlot, Richard. "Développement de poudres coercitives et anisotropes de Sm2(Fe(1-x)Cox)17N-3 pour la fabrication d'aimants liés anisotropes." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10236.

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Notre etude a consiste a developper de nouveaux procedes susceptibles de permettre l'optimisation des performances magnetiques du compose sm#2(fe#1##xco#x)#1#7n#y. En ce sens, nous avons etudie les mecanismes physico-chimiques et metallurgiques mis en jeu lors du developpement d'une microstructure permettant l'obtention de poudres fortement coercitives et anisotropes, et les methodes d'application de ces poudres (aimants lies). Alors que le procede hddr et la nitruration sous champ magnetique intense (8 t) se sont montres favorables au developpement d'une microstructure coercitive et isotrope,

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27

Doyle, Olivia. "Electrodeposition of tin/cobalt/iron alloy systems from environmentally acceptable electrolytes." Thesis, Glasgow Caledonian University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404999.

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28

Vermeulen, Jean-Luc. "Elaboration par pulvérisation ionique et caractérisation de couches minces ferromagnétiques à forte perméabilité." Grenoble 1, 1993. http://www.theses.fr/1993GRE10071.

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Dans le cadre des applications employant des materiaux ferromagnetiques aux hyperfrequences, nous avons etudie les proprietes magnetiques et electriques de couches minces ferromagnetiques metalliques et dielectriques deposees par pulverisation ionique. Le premier volet de ce memoire se rapporte a l'installation de depot. Des parametres cles tels que l'orientation de la cible et la temperature du substrat font l'objet d'une analyse approfondie. Cette etude a permis ainsi d'aboutir a l'obtention de couches denses de qualite maitrisee. Sur la base de ces preliminaires, des films minces microcrist

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29

Єрмоленко, Ірина Юріївна. "Наукові основи електрохімічної технології покриттів тернарними сплавами заліза з тугоплавкими металами". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37459.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.17.03 ‒ технічна електрохімія. ‒ Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертацію присвячено розробці наукових основ електрохімічних технологій покриттів тернарними сплавами заліза та кобальту з молібденом і вольфрамом підвищеної функціональності. Експериментально доведено гіпотезу що-до конкурентного відновлення металів тріади заліза з тугоплавкими компонентами, обумовленого взаємним впливом термодинамічних, кристалохімічних характеристик сплавотвірних металів і

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Єрмоленко, Ірина Юріївна. "Наукові основи електрохімічної технології покриттів тернарними сплавами заліза з тугоплавкими металами". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37455.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.17.03 ‒ технічна електрохімія. ‒ Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертацію присвячено розробці наукових основ електрохімічних технологій покриттів тернарними сплавами заліза та кобальту з молібденом і вольфрамом підвищеної функціональності. Експериментально доведено гіпотезу що-до конкурентного відновлення металів тріади заліза з тугоплавкими компонентами, обумовленого взаємним впливом термодинамічних, кристалохімічних характеристик сплавотвірних металів і

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31

Hailer, Benjamin Thomas. "Effect of Heat Treatment on Magnetic and Mechanical Properties of an Iron-Cobalt-Vanadium-Niobium Alloy." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32135.

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Iron-cobalt-vanadium alloys can be processed to have excellent soft magnetic properties for use in high performance power generation applications such as the rotors and stators of aircraft integrated power units. These soft magnetic properties are, however, developed at the expense of mechanical strength and toughness. Small additions of niobium are reported to increase the strength of these Fe-Co-V alloys. This study evaluates the effects of heat treatment on the mechanical and magnetic properties of heavily cold work strip of a 48 wt.% iron-48 wt.% cobalt-2 wt.% vanadium alloy with a 0.3

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32

Bordel, Catherine. "Etude de la modification par nitruration des propriétés magnétiques des alliages amorphes TbFe et TbFeCo." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10174.

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Nous avons elabore par pulverisation cathodique des couches minces amorphes de tbfe et tbfeco nitrurees, dans le but d'etudier le role de l'azote sur les proprietes magnetiques de ces alliages. Des experiences de spectroscopie d'absorption x mettent en evidence l'existence d'un ordre structural local dans les echantillons tbfe(co), que nous considerons comme l'origine de l'anisotropie magnetique perpendiculaire presente dans ces alliages. Les mesures magnetiques macroscopiques montrent une modification tres importante des proprietes magnetiques, notamment une forte reduction de la temperature

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33

Pinheiro, Jean Patrick. "Croissance catalytique sous CO de carbone filamentaire et nanotubulaire." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10030.

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Des filaments de carbone peuvent etre obtenus entre 450 et 550c par dismutation du monoxyde de carbone sur un alliage equimassique fer-cobalt elabore in-situ et supporte par un alumino-silicate fibreux (nextel). Ce travail a permis de preciser l'ensemble des processus intervenant lors d'une telle reaction de catalyse heterogene. Une etude thermodynamique du comportement de l'alliage en atmosphere co/co#2 a ete engagee de maniere a mieux apprehender les transformations susceptibles d'affecter le catalyseur en cours de reaction. Cette etude prevoit, entre autres resultats, une importante extensi

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34

Lenoble, Marie-Anne. "Dépot électrolytique de CoFeCu, matériau magnétique doux de forte induction pour tetes magnétiques." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0156.

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L'alliage cofecu a ete choisi pour son aptitude a repondre aux criteres que doit remplir tout nouveau materiau magnetique doux des tetes magnetiques. Une etude electrochimique des phenomenes de depot, a permis de preciser les parametres operatoires qui influent sur la composition de l'alliage. Des depots sont d'abord realises sur de grandes surfaces pour les caracterisations magnetiques et structurales: un lien est etabli entre la composition donnant les proprietes optimales et la structure de l'alliage. Les depots dans des caissons de taille micronique pour les tetes magnetiques couches mince

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35

Crozier, Brendan M. "Electrodeposition of iron-cobalt alloys from a dibasic ammonium citrate stabilized plating solution." 2009. http://hdl.handle.net/10048/558.

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Thesis (M. Sc.)--University of Alberta, 2009.<br>Title from pdf file main screen (viewed on Sept. 2, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Materials Engineering, Department of Chemical and Materials Engineering, University of Alberta." Includes bibliographical references.

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Avadhani, G. S. "Warm Working Behaviour Of Alpha-iron, Fe-Si, Fe-Co And Fe-Ni Alloys : A Study Using Processing Maps." Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1595.

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Avadhani, G. S. "Warm Working Behaviour Of Alpha-iron, Fe-Si, Fe-Co And Fe-Ni Alloys : A Study Using Processing Maps." Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1595.

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Crozier, Brendan Matthew. "Electrodeposition of iron-cobalt alloys from a dibasic ammonium citrate stabilized plating solution." Master's thesis, 2009. http://hdl.handle.net/10048/558.

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Iron-cobalt alloys have been extensively studied as potential hard disk drive write head materials due to their potentially high saturation flux densities (~2.4T), low coercivities and ease of deposition. Iron-cobalt plating solutions have, however, been shown to have stability issues, necessitating that they be used at low pH or that a stabilizing agent be added to the solution. The purpose of this thesis is to evaluate the stability of a dibasic ammonium citrate plating solution and to characterize the deposits which result from its use. The plating solutions are found to be less stable th

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"Oxygen Nanodistributions in Cobalt-Iron Electrodeposited Thin Films: Some Effect on Magnetic Properties- High Resolution Analytical Electron Microscopy." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.14893.

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abstract: Soft magnetic alloys play a significant role for magnetic recording applications and highly sensitivity magnetic field sensors. In order to sustain the magnetic areal density growth, development of new synthesis techniques and materials is necessary. In this work, the effect of oxygen incorporation during electrodeposition of CoFe alloys on magnetic properties, magnetoresistance and structural properties has been studied. Understanding the magnetic properties often required knowledge of oxygen distribution and structural properties of the grown films. Transmission electron microscopy

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40

SHIH, HAO-CHIEN, and 施皓騫. "Preparation of Carbon/Iron-Cobalt Alloy Composite as a Counter Electrode for Dye-Sensitized Solar Cells." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/73002929700904022369.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系博碩士班<br>105<br>In this study, cobalt hexacyanoferrate (CoHCF) nanoparticles with various morphologies were obtained by adding different amounts of polyvinylpyrrolidone (PVP) during synthesis. CoHCF nanoparticles containing various amounts of PVP were calcined at 750C under argon flow to obtain the carbon nanospheres, nanocubes, nanotubes. These materials were subjected to acid treatment to partially remove the iron-cobalt alloy in the nanoparticles, leading to an increase in the specific surface area. The carbon/iron-cobalt alloy composite was deposited on a cond

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Lei, Hsueh-Chung, and 雷學忠. "Effect of NbC Addition on Microstructure and Surface Performance of Stellite6 Cobalt-based Alloy PTA Coating Layer on Spheroidal Graphite Cast Iron." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/h573ad.

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碩士<br>遠東科技大學<br>機械工程研究所在職專班<br>107<br>In this study, Stellite6 alloys were respectively overlaid on spheroidal graphite(SG) cast irons with 3.0 wt% carbon and 2.8 wt% silicon by plasma transferred arc (PTA) process in the fixed overlaying speed, travel speed and overlaying current by changing the additive content of NbC in the Stellite6 alloys. To explore its influence on the solidification structure of the overlayer and the interface region. In the study, we also used the overlayer with the NbC additve in cobalt-base superalloys for the cutting wear test to explore the effects of different th

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