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Teses / dissertações sobre o tema "Tungsten"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Erdogan, Metehan. "Recovery Of Tungsten From Tungsten Bearing Compounds." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615540/index.pdf.

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Extensive research in recent years has failed to develop any essentially new method of large scale tungsten production. A new tungsten powder production technique from calcium tungstate (CaWO4) has recently been reported. In this thesis, this technique was further explored from the aspects of electrochemical reduction mechanism and kinetics, applicability to scheelite concentrates and industrial production. Cyclic voltammetry, constant potential and constant current electrochemical reduction tests were performed to determine the reversible cell potential. Analyses of the experimental results

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2

Zacharias, Marisa Aparecida [UNESP]. "Síntese, caracterização e estudos de precursores e de óxidos de molibdênio e de tungstênio." Universidade Estadual Paulista (UNESP), 2000. http://hdl.handle.net/11449/105673.

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Made available in DSpace on 2014-06-11T19:35:05Z (GMT). No. of bitstreams: 0 Previous issue date: 2000-02-21Bitstream added on 2014-06-13T19:44:56Z : No. of bitstreams: 1 zacharias_ma_dr_araiq.pdf: 3695623 bytes, checksum: f2762446db235d48a685f25509e7eeb2 (MD5)<br>O presente trabalho tem como objetivo a obtenção de óxidos de molibdênio e de tungstênio com propriedades texturais controladas, particularmente com elevadas áreas específicas. Tais óxidos serão posteriormente empregados como precursores nas sínteses de nitretos e carbetos de molibdênio e de tungstênio, materiais potencialmente pro

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3

Gianni, Lorenzo. "Electrodialytic recovery of tungsten and cobalt from tungsten carbide scrap." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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Critical raw materials (CRMs) are essential for a wide range of European industrial ecosystems. Access to critical resources is necessary for Europe’s ambition to achieve climate neutrality and deliver the Green Deal. However, supply of material from primary sources is putting extreme pressure on the planet through greenhouse gas emissions, biodiversity loss and water stress. In this scenario, promoting circular economy by obtaining resources from secondary sources is therefore essential to reduce the environmental burden posed by raw material primary extraction and to secure the supply chain

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4

Ogundipe, Adebayo. "Environmental release of tungsten and other elements from tungsten heavy alloys addressing the environmental viability of tungsten heavy alloys." Saarbrücken VDM Verlag Dr. Müller, 2006. http://d-nb.info/989277992/04.

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5

Pimenta, Juliana de Oliveira [UNESP]. "Influência do tratamento térmico assistido por pressão nas propriedades óptica e elétrica do trióxido de tungstênio." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/138511.

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Made available in DSpace on 2016-05-17T16:51:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-10-23. Added 1 bitstream(s) on 2016-05-17T16:55:29Z : No. of bitstreams: 1 000863481.pdf: 2321316 bytes, checksum: aa11a4318131811b9ac2636856e02252 (MD5)<br>The aim of this work is to study the influence of a pressure-assisted heat treatment on the electrical and optical properties of nanoparticulate tungsten trioxide (WO3) obtained by microwave assisted hydrothermal method. The behavior of WO3 as gas sensor and its pholominescence emission were used to evaluate the electrical and optical p

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6

Pimenta, Juliana de Oliveira. "Influência do tratamento térmico assistido por pressão nas propriedades óptica e elétrica do trióxido de tungstênio /." Araraquara, 2015. http://hdl.handle.net/11449/138511.

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Orientador: José Arana Varela<br>Co-orientador: Sergio Mazurek Tebcherani<br>Banca: Evaldo Toniolo Kubaski<br>Banca: Máximo Siu Li<br>Banca: Sônia Maria Zanetti<br>Banca: Anderson André Felix<br>Resumo:Este trabalho é referente ao estudo investigativo da influência de um tratamento térmico assistido por pressão nas respostas de propriedade elétrica, como sensor de gás e propriedade ótica de fotoluminescência de nanopartículas de trióxido de tungstênio (WO3), obtidas por processo hidrotermal assistido com micro-ondas adaptado. As condições de tratamento foram de 180 ºC sob pressão de 2 MPa dura

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7

Zacharias, Marisa Aparecida. "Síntese, caracterização e estudos de precursores e de óxidos de molibdênio e de tungstênio /." Araraquara : [s.n.], 2000. http://hdl.handle.net/11449/105673.

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Resumo: O presente trabalho tem como objetivo a obtenção de óxidos de molibdênio e de tungstênio com propriedades texturais controladas, particularmente com elevadas áreas específicas. Tais óxidos serão posteriormente empregados como precursores nas sínteses de nitretos e carbetos de molibdênio e de tungstênio, materiais potencialmente promissores na decomposição catalítica da hidrazina em sistemas micropopulsivos de satélites. Sabe-se da literatura que uma rede inorgânica de óxidos pode ser proveniente de vários precursores. Visando alcançar o objetivo do trabalho proposto, procurou-se primei

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8

Björklund, Kajsa. "Microfabrication of Tungsten, Molybdenum and Tungsten Carbide Rods by Laser-Assisted CVD." Doctoral thesis, Uppsala University, Department of Materials Chemistry, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1593.

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<p>Thin films of refractory metals and carbides have been studied extensively over many years because of their wide range of application. The two major techniques used are Chemical Vapour Deposition (CVD) and Physical Vapour Deposition (PVD). These can result in the deposition of two-dimensional blanket or patterned thin films. Laser-assisted Chemical Vapour Deposition (LCVD) can provide a maskless alternative for localised deposition in two and three dimensions. This thesis describes LCVD of micrometer-sized tungsten, molybdenum and tungsten carbide rods. The kinetics, phase composition and m

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9

Björklund, Kajsa. "Microfabrication of tungsten, molybdenum and tungsten carbide rods by laser-assisted CVD /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5197-7/.

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10

Williams, Paul Andrew. "The synthesis of novel tungsten precursors for the CVD of tungsten oxide." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323568.

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11

Poon, Michael. "Deuterium retention in tungsten." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0008/MQ40899.pdf.

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12

Stewart, Lisa Joanne. "Tungsten-substituted DMSO reductase." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368244.

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13

Selcuk, Cem. "Reactive sintering of tungsten." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405300.

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14

Laine, A. D. "Inverse photoemission of tungsten." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380177.

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15

Christian, Joel B. "Tungsten fuel cell catalysts." Diss., Online access via UMI:, 2007.

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16

Wilder, Corey B. "Study of tungsten(IV) and tungsten(VI) imido complexes synthesis, structural analysis, and reactivity /." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011630.

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17

Buzi, Luxherta. "Influence of the Particle Flux on Surface Modifications of Tungsten." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0117/document.

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Le tungstène est le matériau choisi pour le divertor d'ITER en raison de ses propriétés thermiques et physiques. Les densités de flux et les énergies des particules, et la température de surface pourront varier de plusieurs ordres de grandeur le long de la surface du divertor, soit respectivement 1020-1024 m2s-1, 0.1-100 eV, et 370-1370K. Exposé à de telles conditions, le tungstène peut subir de l'érosion, des fissurations et d'autres modifications de surface affectant ses propriétés thermomécaniques. Une autre préoccupation est la rétention des atomes de tritium implantés dans la surface et l

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18

Martin, Jeffrey Thomas. "Organometallic nitrosyl hydrides of tungsten." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27449.

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Although hydrides of metal carbonyls are widely known, the number of hydrides in the related family of metal nitrosyls is extremely small. The preparation of a series of nitrosyl hydrides from the treatment of [CpW(NO)I₂]₂ (Cp=ƞ⁵-C₅H₅) with Na[H₂Al(OCH₂CH₂OCH₃)₂] is described. The addition of one or two equivalents of the aluminum reagent results in the formation of [CpW(NO)IH]₂ or [CpW(NO)H₂]₂ respectively. The reaction of [CpW(NO)IH]₂ with a Lewis base (L=P(OPh)₃, P(OMe)₃, PPh₃ or PMe₃) gives the monometallic CpW(NO)IHL, while [CpW(NO)H₂]₂ reacts with P(OPh)₃ or P(OMe)₃ to yield [CpW(NO)HL]₂

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19

Segar, Richard William Moore. "Activated tungsten inert gas welding." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621314.

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20

Li, F. X. "Chemical vapour deposition of tungsten and tungsten silicide layers for applications in novel silicon technology." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269129.

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21

Verbrugghe, Nathalie. "Lithographie optique, dépôts de films minces de tungstène et trioxyde de tungstène dédiés aux capteurs de gaz semiconducteurs." Thesis, Littoral, 2019. http://www.theses.fr/2019DUNK0527/document.

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Porté par les préoccupations actuelles en matière de sécurité et de qualité environnementale ainsi que par les efforts de recherche entrepris dans ce domaine, le marché mondial des capteurs de gaz est en pleine expansion. Dans le contexte de la commercialisation d'un capteur de gaz, une phase d'amélioration de ses performances, et notamment de sa sensibilité et de sa stabilité, est naturellement nécessaire. Cependant, il s'avère également pertinent d'envisager d'en diminuer le coût de fabrication. Pour cela, il convient de développer une technologie utilisant d'une part des matériaux bas coût

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22

Dyson, Glynn. "The low-temperature chemical vapour deposition of tungsten carbide coatings utilising the pyrolysis of tungsten hexacarbonyl." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/33243.

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A detailed study has been made of the atmospheric pressure chemical vapour deposition (CVD) of tungsten carbide coatings onto powder metallurgy (PM) BT42 grade high speed steel (HSS) indexable cutting tool inserts. The pyrolysis of tungsten hexacarbonyl (W(CO)6) deposition route was utilised in conjunction with a laboratory-scale hot-wall CVD reactor. After numerous coating runs, deposition conditions were established under which rudimentary tungsten carbide coatings could be deposited at 350°C. The characteristics of these coatings were determined using an established characterisation procedu

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23

Donati, George Luís. "Trends in tungsten coil atomic spectrometry." Winston-Salem, NC : Wake Forest University, 2010. http://dspace.zsr.wfu.edu/jspui/handle/10339/73044.

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24

Wahlberg, Sverker. "Nanostructured Tungsten Materials by Chemical Methods." Licentiate thesis, KTH, Funktionella material, FNM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42702.

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Tungsten based-materials are used in many different technical fields, particularly in applications requiring good temperature and/or erosion resistance. Nanostructuring of tungsten alloys and composites has the potential to dramatically improve the materials’ properties, enhancing the performance in present applications or enabling totally new possibilities. Nanostructured WC-Co composites have been the focus of researchers and industries for over two decades. New methods for powder fabrication and powder consolidation have been developed. However, the fabrication of true nanograined WC-Co mat

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25

Garner, Sally Elizabeth. "Ion insertion in tungsten trioxide electrodes." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30079.

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The role of ion insertion into the electrochromic metal oxide WO3 has been studied using a combination of electrochemical, gravimetric and spectroscopic techniques. The electrochemical quartz crystal microbalance (EQCM) was used to investigate the effect of electrolyte composition by studying the identity of the cations and anions involved and the concentration of the electrolyte used. It was found that the effect of electrolyte concentration and choice of anion did not affect film reduction and re-oxidation. The two cations studied, Li- and Na+, however cause marked differences in film redox

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26

Potter, Frances Helen. "Surface studies of the tungsten bronzes." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357429.

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27

Parkin, G. "The chemistry of trimethylphosphine tungsten complexes." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355780.

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28

Wahlberg, Sverker. "Tungsten-Based Nanocomposites by Chemical Methods." Doctoral thesis, Stockholm, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156604.

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Tungsten based-materials find use in many different fields of engineering, particularly in applications where good temperature and/or erosion resistance is important. Nanostructuring of tungsten composites is expected to dramatically improve the materials’ properties and enhancing the performance in present applications but also enabling totally new possibilities. Nanostructured WC-Co materials have been the focus of researchers and engineers for over two decades. New fabrication methods have been developed. But, the fabrication of true nanograined WC-Co composites is still a challenge. Nanost

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29

McLaren, M. G. "Ion bombardment induced deposition of tungsten." Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308526.

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30

Whitby, Raymond Lee Derek. "Nanocomposites of carbon and tungsten disulphide." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394897.

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31

Gardner, Jonathan. "Ferroelectricity in empty tetragonal tungsten bronzes." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/10592.

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In this work, in-depth structural and electrical characterisation is used to study a family of “empty” tetragonal tungsten bronzes (TTBs), A2₄A1₂B1₂B2₈O₃₀. An initial investigation into the effect of the A1-cation size on the properties of empty Ba₄R₀.₆₇◻₁.₃₃Nb₁₀O₃₀ TTBs (where R is the A1-cation and R = La, Nd, Sm, Gd, Dy and Y; ◻ = vacancy) was performed. These were determined to be metrically tetragonal by powder x-ray diffraction, with decreasing R cation size inducing increased crystal anisotropy. This tetragonal structural distortion, driven by contraction in the ab-plane, is shown to st

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32

Deshpande, Pranav Kishore. "Infrared Processed Copper-Tungsten Carbide Composites." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1025107651.

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33

Nitta, Koji. "Electrodeposition of tungsten from molten salts." Kyoto University, 2009. http://hdl.handle.net/2433/126410.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(エネルギー科学)<br>甲第14961号<br>エネ博第204号<br>新制||エネ||46(附属図書館)<br>27399<br>UT51-2009-M875<br>京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻<br>(主査)教授萩原理加, 教授尾形幸生, 准教授野平俊之<br>学位規則第4条第1項該当

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34

Khosla, Chetna Templeton J. L. "Intermediate oxidation state tungsten acetylacetonate complexes." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2296.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2009.<br>Title from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.

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35

Belyaeva, A. I., A. A. Galuza, I. V. Kolenov, V. G. Konovalov, Alla Aleksandrovna Savchenko, and O. A. Skoryk. "Effect of sputtering on the samples of iter-grade tungsten preliminarilly irradiated by tungsten ions: optical investigations." Thesis, Національний науковий центр "Харківський фізико-технічний інститут", 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48176.

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36

Osman, Joseph Michael. "Optical switching and memory using tungsten oxide." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

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37

Kukkola, J. (Jarmo). "Gas sensors based on nanostructured tungsten oxides." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526202082.

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Abstract The aim of this thesis is to study whether nanostructured particles of WO3 could be competitive counterparts of traditional, more bulky materials in resistive gas sensor applications. Pristine and various surface decorated derivatives of three different types of WO3 nanoparticles applied on the surface of lithographically defined Si chips were used in the work to analyse the electrical behaviour of thin films when exposed to different gas atmospheres. Nanosized particles of WO3, obtained by capillary force-induced collapse of porous anodic tungsten oxide in water, were demonstrated as

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38

Walker, Daniel James. "Fluorinations of tungsten and molybdenum carbonyl complexes." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30011.

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The dimeric complexes (n5-C5H5)M(CO)3 2 (where M = W or Mo) and (H3C{ti5-C5H4})Mo(CO)3 2 have been treated with XeF2 in organic solvents. All three materials react to form air sensitive products which solid-phase IR studies show to contain highly oxidised metal carbonyl components. The product from the fluoridation of (H3C{T 5-C5H5})Mo(CO)3 2 is insufficiently stable in solution for it to be characterised further. 19F NMR studies show that (n5-C5H5)W(CO)3 2 reacts to form the new complex (T 5-C5H5)WF5, but that the molybdenum analogue reacts to form an unidentified product which, although it p

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39

Hong, Kunquan. "Synthesis of one-dimensional tungsten oxide nanostructures." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/HKUTO/record/B39558551.

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40

洪昆權 and Kunquan Hong. "Synthesis of one-dimensional tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39558551.

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41

Hu, Rong, and 胡蓉. "Synthesis and characterization of tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41508774.

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42

Espinosa, Daniel C. "Visualization of gas tungsten arc weld pools." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28643.

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43

Thiebaut, Benedicte. "Co-ordinatively unsaturated complexes of tungsten (II)." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/606.

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44

Bain, Michael. "The deposition and characterisation of CVD tungsten." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326383.

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45

Macpherson, I. "Some metallaborane chemistry of molybdenum and tungsten." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376799.

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46

Polya, D. A. J. "Chemical behaviour of tungsten in hydrothermal fluids." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378304.

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47

Shen, Peikang. "A study of modified tungsten trioxide electrodes." Thesis, University of Essex, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315727.

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48

Shonfield, Peter K. A. "Molybdenum and tungsten complexes for moleular electronics." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264635.

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49

Thummavichai, Kunyapat. "Tungsten oxide nanostructures and their electrochromic performance." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33858.

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The electrochromic behaviour of tungsten oxide (WOx) bulk forms has attracted huge research interest for decades owing to advantages of fast response time, good reversibility and high colouration efficiency compared with other electrochromic materials. Nanomaterials have certainly brought in new opportunities and opened the door for better, higher and smarter devices fabrication. This thesis will first investigate, explore, and understand the electrochromic performance of WOx in the nanoscale, and identify ways to enhance its performance via effective doping electrolyte selection and heat trea

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50

Kelley, Andrew III. "Tungsten carbide-cobalt by Three Dimensional Printing." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/32316.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.<br>Includes bibliographical references (p. 69-70).<br>Three Dimensional Printing is an additive manufacturing process for rapid prototyping ceramic and metallic parts [Sachs, et al, 1990]. Green (not sintered) tungsten carbide-cobalt parts must have a density greater than 50% of the theoretical density, 14.9 g/cc, for proper sintering and post-processing. Two approaches were assessed for feasibility and robustness: printing slurry into tungsten carbide-cobalt spray dried powder and printing a solvent i

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