Bibliografias temáticas / Tungsten

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Literatura científica selecionada sobre o tema "Tungsten"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 25 de julho de 2025

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Artigos de revistas sobre o assunto "Tungsten"

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Kwon, Hanjung, and Jung-Min Shin. "Sintering Behavior and Hardness of Tungsten Prepared by Hard Metal Sludge Recycling Process without Ammonium Paratungstate." Korean Journal of Metals and Materials 60, no. 1 (2022): 53–61. http://dx.doi.org/10.3365/kjmm.2022.60.1.53.

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In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the sodium and crystallized tungstate resulting in the formation of tungstic acid (H2WO4). Tungsten powders were successfully synthesized by hydrogen reduction of the tungstic acid through H2O decomposition, WO3 to WO2 reduction, and tungsten metal formation. The tungsten powders prepared f
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Pee, J. H., G. H. Kim, H. Y. Lee, and Y. J. Kim. "Extraction Factor Of Tungsten Sources From Tungsten Scraps By Zinc Decomposition Process." Archives of Metallurgy and Materials 60, no. 2 (2015): 1311–14. http://dx.doi.org/10.1515/amm-2015-0120.

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Abstract Decomposition promoting factors and extraction process of tungsten carbide and tungstic acid powders in the zinc decomposition process of tungsten scraps which are composed mostly of tungsten carbide and cobalt were evaluated. Zinc volatility was suppressed by the enclosed graphite crucible and zinc volatilization pressure was produced in the reaction graphite crucible inside an electric furnace for ZDP (Zinc Decomposition Process). Decomposition reaction was done for 2hours at 650°, which 100% decomposed the tungsten scraps that were over 30 mm thick. Decomposed scraps were pulverize
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Fu, Xiao Ming, Chen Chen Xie, and Liang Yi Zhou. "Submicron Tungsten Powder Prepared through the Circulatory Oxidization-Reduction Method." Advanced Materials Research 228-229 (April 2011): 283–87. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.283.

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Tungstic oxide is prepared with pure ammonium paratungstate in the air. And then Tungsten powder is obtained with tungstic oxide through deoxidation in the hydrogen gas (Rate of purity: 99.99 %, dew point: -40 °C), and tungsten powder is oxidized in the air. Tungstic oxide is reduced into tungsten powder in the hydrogen gas. The above routes are repeated. The samples are characterized by the laser particle size distribution measuring instrument and the electron probe scan instrument. The results show that submicron tungsten powder is obtained through circulatory oxidation twice and reductiuon
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Nagy, Áron Kázmér, Judit Pfeifer, István Endre Lukács, Attila Lajos Tóth, and Csaba Balázsi. "Electrospinning – A Candidate for Fabrication of Semiconducting Tungsten Oxide Nanofibers." Materials Science Forum 659 (September 2010): 215–19. http://dx.doi.org/10.4028/www.scientific.net/msf.659.215.

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The excellent gas sensing properties of the tungsten oxides have been manifested first of all in nanostructure and 1D, and 2D open structured forms. For optimal performance the sensing layer substrates should be of large specific surface. In this paper we report on electrospinning – a candidate for fabrication of large specific surface tungsten oxide nanofibers. Fibrous tissues doped with tungstic acid hydrate (H2WO4.H2O) and tungsten oxide one third hydrate (WO3.1/3H2O) has been created and characterized by X-ray diffraction, scanning electron microscope and energy dispersive spectroscopy in
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Li, Xinran, Hao Jiang, Zhiwei Peng, Anan Duan, Tong Zhang, and Zexi Gong. "Leaching of Scheelite Concentrate for Tungsten Extraction." Minerals 15, no. 5 (2025): 475. https://doi.org/10.3390/min15050475.

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As a critical raw material, tungsten plays a broad role in machining, electronics, aerospace, and other high-tech industries. The extraction of tungsten from tungsten concentrates is a prerequisite for the production of high-purity products. Approximately 70% of China’s tungsten resources are in the form of scheelite. The extraction method of low-quality scheelite is crucial for the production application of the tungsten process as resources of high-quality wolframite are gradually being depleted. This article systematically reviews the processes and challenges faced in the hydrometallurgical
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Baimbetov, Bolotpay, Yeleussiz Tazhiyev, Akmaral Yeleuliyeva, et al. "Sintering with Sodium Carbonate and Leaching of Wolframite Cakes." Applied Sciences 14, no. 24 (2024): 12031. https://doi.org/10.3390/app142412031.

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Focuses on the processing of tungsten raw materials through various operations, including sintering, leaching, purification, and the production of technical tungstic acid. Modern research aims to enhance these processes, particularly the sintering of wolframite concentrates with alkali metal compounds and the leaching of concentrates and cakes. Experiments revealed that reactions between tungsten minerals and sodium carbonate from Akchatau ores commence at temperatures above 520–550 °C, intensifying between 750 and 850 °C. The concentrates were sintered at 750, 800, and 850 °C with a sodium ca
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Nielsen, K. H., K. Wondraczek, U. S. Schubert, and L. Wondraczek. "Large-area wet-chemical deposition of nanoporous tungstic silica coatings." Journal of Materials Chemistry C 3, no. 38 (2015): 10031–39. http://dx.doi.org/10.1039/c5tc02045j.

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Labbe, Ph. "Tungsten Oxides, Tungsten Bronzes and Tungsten Bronze-Type Structures." Key Engineering Materials 68 (January 1992): 293–0. http://dx.doi.org/10.4028/www.scientific.net/kem.68.293.

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Pee, J. H., G. H. Kim, H. Y. Lee, and Y. J. Kim. "Extraction Factor Of Pure Ammonium Paratungstate From Tungsten Scraps." Archives of Metallurgy and Materials 60, no. 2 (2015): 1403–5. http://dx.doi.org/10.1515/amm-2015-0141.

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Abstract Typical oxidation process of tungsten scraps was modified by the rotary kiln with oxygen burner to increase the oxidation rate of tungsten scraps. Also to accelerate the solubility of solid oxidized products, the hydrothermal reflux method was adapted. By heating tungsten scraps in rotary kiln with oxygen burner at around 900° for 2hrs, the scraps was oxidized completely. Then oxidized products (WO3 and CoWO4) was fully dissolved in the solution of NaOH by hydrothermal reflux method at 150° for 2hrs. The dissolution rate of oxidized products was increased with increasing the reaction
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Kumar, A., and N. C. Aery. "Effect of tungsten on growth, biochemical constituents, molybdenum and tungsten contents in wheat." Plant, Soil and Environment 57, No. 11 (2011): 519–25. http://dx.doi.org/10.17221/345/2011-pse.

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  The effect of various concentrations (3, 9, 27, 81, and 243 mg/kg) of tungsten (W) on growth performance, biochemical constituents and tungsten and molybdenum (Mo) contents in wheat was observed. Lower doses (up to 9 mg/kg) of tungsten showed promotory effects whereas higher doses retarded. An increment in growth, biomass, chlorophyll and carbohydrate contents was observed. Tungsten contents in root and shoot showed a very strong linear dependence on the soil applied W contents. Mo contents in plant tissue showed an increase with an increase in the W contents in plant tissue up to a
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Teses / dissertações sobre o assunto "Tungsten"

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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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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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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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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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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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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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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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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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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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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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Livros sobre o assunto "Tungsten"

1

Lassner, Erik, and Wolf-Dieter Schubert. Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9.

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Smith, Gerald R. Tungsten. U.S. Department of the Interior, Bureau of Mines, 1991.

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3

United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Tungsten. Dept. of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, Division of Toxicology, 2005.

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4

International Conference on Tungsten and Tungsten Alloys (1st 1992 Arlington, Va.). Tungsten & tungsten alloys, 1992: Proceedings of the First International Conference on Tungsten and Tungsten Alloys. The Federation, 1993.

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5

Czack, Gerhard, Gerhard Kirschstein, Wolfgang Kurtz, and Frank Stein. W Tungsten. Edited by Wolfgang Huisl, Wolfgang Kurtz, and Frank Stein. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-10154-4.

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Jehn, Hermann, Schwäbisch Gmünd, Gudrun Bär, Erich Best, and Ernst Koch. W Tungsten. Edited by Jörn von Jouanne, Elisabeth Koch, and Ernst Koch. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08684-1.

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Best, Erich, Peter Kuhn, Wolfgang Kurtz, and Hildegard List. W Tungsten. Edited by Hartmut Bergmann, Dieter Gras, Ingeborg Hinz, Ernst Koch, Wolfgang Kurtz, and Ursula Vetter. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-08687-2.

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Kurtz, Wolfgang, and Hans Vanecek. W Tungsten. Edited by Ernst Koch and Wolfgang Kurtz. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-08690-2.

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Kurlov, Alexey S., and Aleksandr I. Gusev. Tungsten Carbides. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00524-9.

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Vallejo, César. Tungsten: A novel. Syracuse University Press, 1988.

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Capítulos de livros sobre o assunto "Tungsten"

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Lassner, Erik, and Wolf-Dieter Schubert. "The Element Tungsten." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_1.

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Lassner, Erik, and Wolf-Dieter Schubert. "Tungsten in Catalysis." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_10.

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Lassner, Erik, and Wolf-Dieter Schubert. "Tungsten Scrap Recycling." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_11.

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Lassner, Erik, and Wolf-Dieter Schubert. "Ecology." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_12.

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Lassner, Erik, and Wolf-Dieter Schubert. "Economy." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_13.

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Lassner, Erik, and Wolf-Dieter Schubert. "Tungsten and Living Organisms." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_14.

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Lassner, Erik, and Wolf-Dieter Schubert. "Tungsten History." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_2.

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Lassner, Erik, and Wolf-Dieter Schubert. "Important Aspects of Tungsten Chemistry." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_3.

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Lassner, Erik, and Wolf-Dieter Schubert. "Tungsten Compounds and Their Application." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_4.

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Lassner, Erik, and Wolf-Dieter Schubert. "Industrial Production." In Tungsten. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4907-9_5.

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Trabalhos de conferências sobre o assunto "Tungsten"

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Ding, Tian, Cheng Tang, Xiaoyan He, et al. "Ebara Tungsten CMP Process Defect Improvement." In 2025 Conference of Science and Technology of Integrated Circuits (CSTIC). IEEE, 2025. https://doi.org/10.1109/cstic64481.2025.11017838.

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Singh Gaur, Raj P. "Scale Formation in Tungsten Chemical Process." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07060.

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Abstract This paper pertains to the characterization and chemistry of scale formation occurring in an industrial tungsten chemical process. In tungsten process, scales typically form in filter presses, pipes (carrying various solutions and waste waters) and evaporation crystallizers. This paper presents our results on the scale that forms in a filter press. Scale is formed on the plate supporting filter cloth and located in the exit side of wash solution. Major constituents of the scale were two tantalum compounds: Na14(Ta0.715Nb0.285)12O37.31H2O and Na3Ta0.715Nb0.285O4. It is suspected that t
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Quets, J., and J. R. Alford. "Corrosion and Wear Resistance of Tungsten Carbide - Cobalt and Tungsten Carbide - Cobalt - Chromium Thermal Spray Coatings." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99047.

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Abstract Tungsten Carbide Thermal Spray coatings provide wear surfaces to new and overhauled components for various industries. Their wear resistance is obtained by incorporating small tungsten carbide particles into a metal matrix. This presentation will show what parameters influence their corrosion resistance in the ASTM B-117 Salt Spray Corrosion Test.
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Allahar, Kerry N., Darryl P. Butt, Jon Webb, and Indrajit Charit. "Electrochemical Properties of Spark Plasma Sintered Tungsten." In CORROSION 2011. NACE International, 2011. https://doi.org/10.5006/c2011-11205.

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Abstract The increased application of spark plasma sintering (SPS) for powder metallurgy (PM) is due to the benefits of fast heating rate, uniform heating condition, lower sintering temperature and shorter dwell time. This method involves the Joule heating of specimens by a pulsed dc coupled with axial pressure. The limitation of PM is the reduced mechanical strength and corrosion properties as compared to solid-state sintering. Tungsten cermets are prospective next generation nuclear materials and the corrosion resistance of these cermets will be influenced by the native oxide associated with
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Qin, Wentao, Esteban Ortiz, Brandon Lent, et al. "High Contact Resistance from Preferential Oxidation of Silane Gas." In ISTFA 2024. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.istfa2024p0447.

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Abstract High resistance failures in P+ and N+ contact chains were traced to contacts partially filled with silicon dioxide (SiO2) instead of the intended tungsten. Investigation revealed that oxygen (O2) entered the deposition chamber through a faulty valve during silane gas (SiH4) flow for tungsten seed deposition. This contamination triggered a gas-phase reaction producing SiO2 particles that partially filled the contacts. Analysis of reaction kinetics explained the predominance of SiO2 formation over tungsten deposition: the bond dissociation energy for SiO2 formation is lower than that fo
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Kobayashi, Nobuyoshi, Masayuki Suzuki, and Masayoshi Saitou. "Tungsten Plug Technology: Substituting Tungsten for Silicon Using Tungsten Hexaflouride." In 1988 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1988. http://dx.doi.org/10.7567/ssdm.1988.a-5-3.

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Creighton, J. R. "Non-selective tungsten chemical-vapor deposition using Tungsten hexacarbonyl." In AIP Conference Proceedings Vol. 167. AIP, 1988. http://dx.doi.org/10.1063/1.37175.

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MATĚJÍČEK, Jiří, Jakub KLEČKA, Jan CIZEK, et al. "Tungsten-steel and tungsten-chromium composites prepared by RF plasma spraying." In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3548.

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Mittelstadt, Chad R. "Silver Tungsten vs Silver Tungsten Carbide Contact Performance in Environmental Testing." In 2012 IEEE 58th Holm Conference on Electrical Contacts (Holm 2012). IEEE, 2012. http://dx.doi.org/10.1109/holm.2012.6336600.

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Avotina, Liga, Lada Bumbure, Annija Elizabete Goldmane, et al. "Thermal behaviour of magnetron sputtered tungsten and tungsten-boride thin films." In 2022 International Conference on Applied Electronics (AE). IEEE, 2022. http://dx.doi.org/10.1109/ae54730.2022.9920033.

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Relatórios de organizações sobre o assunto "Tungsten"

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Van Rythoven, Adrian. Critical mineral: Tungsten. Montana Bureau of Mines and Geology, 2024. https://doi.org/10.59691/blxb9076.

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Dawson, K. M. Skarn tungsten. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208024.

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Hatfield, Kendrich, Michael McBride, and Donald Johnson. Tungsten Electrodeposition. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2008256.

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Wohletz, K., T. Kunkle, and W. Hawkins. KISMET tungsten dispersal experiment. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/432871.

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Sinclair, W. D. Vein-stockwork tin, tungsten. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208012.

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Brau, James E. Silicon-tungsten Electromagnetic Calorimetry. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1426488.

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Hughes, A. Australian resource reviews: tungsten 2019. Geoscience Australia, 2020. http://dx.doi.org/10.11636/9781925848731.

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Joel B. Christian and Sean P. E. Smith. Tungsten Cathode Catalyst for PEMFC. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/891991.

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Boyle, Timothy J., Ryan Falcone Hess, Michael Luke Neville, and Panit Clifton Howard. Scandium separation from tungsten crucibles :. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1088104.

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Dandekar, Dattatraya P. Spall Strength of Tungsten Carbide. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada427318.

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