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Artigos de revistas sobre o tema "Tungsten"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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&nbsp; 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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11

Kumari, J., and P. Mangala. "Enhanced Anticarcinogenic and Antimicrobial Response of Synthesized Tungsten Oxide Nanoparticles." Journal of Scientific Research 15, no. 1 (2023): 141–57. http://dx.doi.org/10.3329/jsr.v15i1.58211.

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In the present study, we fabricated tungsten trioxide nanoparticles (WO3 NPs) from a tungsten complex [W(C13H10NO)3] of ligand N-salicylideneaniline with tungstic acid as the precursor. Nanoparticles were synthesized using the direct thermal decomposition method. These nanoparticles were evaluated for cytotoxicity influence on human breast cancer MCF7 cell line (adenocarcinoma). The observed results suggested that WO3 can destroy 50 % of viable cells after 24 h of incubation at 37 °C. Based on these results, we concluded that WO3 nanoparticles could be a potential drug carrier candidate agains

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12

Tran-Nguyen, D. H., D. Jewell, and D. J. Fray. "Electrochemical preparation of tungsten, tungsten carbide and cemented tungsten carbide." Mineral Processing and Extractive Metallurgy 123, no. 1 (2013): 53–60. http://dx.doi.org/10.1179/1743285513y.0000000049.

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13

Luchting, Wolfgang A., César Vallejo, and Robert Mezey. "Tungsten." Chasqui 18, no. 2 (1989): 100. http://dx.doi.org/10.2307/29740189.

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14

LOWDEN, RICK. "TUNGSTEN." Chemical & Engineering News 81, no. 36 (2003): 142. http://dx.doi.org/10.1021/cen-v081n036.p142.

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15

Fereday, Richard J. "Tungsten." Coordination Chemistry Reviews 81 (November 1987): 51–100. http://dx.doi.org/10.1016/0010-8545(87)85013-0.

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16

Dunbar, Kim R., and Gary M. Finniss. "Tungsten." Coordination Chemistry Reviews 127, no. 1-2 (1993): 65–97. http://dx.doi.org/10.1016/0010-8545(93)80055-a.

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17

Jasper, Bruno, Jan W. Coenen, Johann Riesch, Till Höschen, Martin Bram, and Christian Linsmeier. "Powder Metallurgical Tungsten Fiber-Reinforced Tungsten." Materials Science Forum 825-826 (July 2015): 125–33. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.125.

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The composite material tungsten fiber-reinforced tungsten (Wf/W) addresses the brittleness of tungsten by extrinsic toughening through introduction of energy dissipation mechanisms. These mechanisms allow the release of stress peaks and thus improve the materials resistance against crack growth. Wf/W samples produced via chemical vapor infiltration (CVI) indeed show higher toughness in mechanical tests than pure tungsten. By utilizing powder metallurgy (PM) one could benefit from available industrialized approaches for composite production and alloying routes. In this contribution the PM metho

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18

Gu, Gang, Bo Zheng, W. Q. Han, Siegmar Roth, and Jie Liu. "Tungsten Oxide Nanowires on Tungsten Substrates." Nano Letters 2, no. 8 (2002): 849–51. http://dx.doi.org/10.1021/nl025618g.

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19

Bell, David A., John L. Falconer, and Carol M. McConica. "Desorption of Tungsten Fluorides from Tungsten." Journal of The Electrochemical Society 142, no. 7 (1995): 2401–4. http://dx.doi.org/10.1149/1.2044309.

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20

Patrick, Chris. "Smaller-grained tungsten is stronger tungsten." Scilight 2020, no. 40 (2020): 401104. http://dx.doi.org/10.1063/10.0002130.

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21

Posthill, J. B., M. C. Hogwood, and D. V. Edmonds. "Precipitation at Tungsten/Tungsten Interfaces in Tungsten–Nickel–Iron Heavy Alloys." Powder Metallurgy 29, no. 1 (1986): 45–51. http://dx.doi.org/10.1179/pom.1986.29.1.45.

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22

Jenuš, P., A. Abram, S. Novak, et al. "Deuterium retention in tungsten, tungsten carbide and tungsten-ditungsten carbide composites." Journal of Nuclear Materials 581 (August 2023): 154455. http://dx.doi.org/10.1016/j.jnucmat.2023.154455.

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23

Wartacz, Daniel Ahlin Heikkinen, Johann Riesch, Karen Pantleon, and Wolfgang Pantleon. "Restoration in drawn tungsten wires of tungsten fiber-reinforced tungsten composites." Fusion Engineering and Design 216 (July 2025): 115038. https://doi.org/10.1016/j.fusengdes.2025.115038.

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24

Pedron, Francesca, and Gianniantonio Petruzzelli. "Influence of Arsenate Competition on Tungstate Sorption by Soil." Sustainability 16, no. 21 (2024): 9363. http://dx.doi.org/10.3390/su16219363.

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The green and digital transitions toward sustainable development will drive an increased demand for critical raw materials, among which tungsten plays a crucial role in emerging sustainable technologies. Understanding the sorption processes of tungsten in soils is essential for assessing its bioavailability and potential toxicity to living organisms. In many soils, tungsten may co-exist with other contaminants, such as arsenic. Investigating the competitive sorption between these two anions helps clarify how they interact within the soil matrix. Batch experiments were conducted on three Medite

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25

Cao, Yaowu, and Qinghai Guo. "Tungsten speciation and its geochemical behavior in geothermal water: A review." E3S Web of Conferences 98 (2019): 07005. http://dx.doi.org/10.1051/e3sconf/20199807005.

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Tungsten and most of its compounds remain one of the least regulated substances. As the potential toxicity of tungsten has been reported, the stereotypes about tungsten are gradually being broken. Areas with intense magmatic hydrothermal activity are likely threatened by geothermal tungsten (up to 1037 μg/L of tungsten was detected in the geothermal waters from a magmatic hydrothermal system in Tibet, Daggyai), and the geothermal developers should be cautious during the utilization of geothermal resource. This paper reviews the studies on transformation of aqueous tungsten species, distributio

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26

Zhudra, A. P. "Tungsten carbide based cladding materials." Paton Welding Journal 2014, no. 6 (2014): 66–71. http://dx.doi.org/10.15407/tpwj2014.06.13.

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27

Baghel, Manas Singh, Dr L. Boriwal, Dharmesh Barodiya, Monil Jain, and Mohd Altaf Ansari. "Micro Additive Manufacturing in Tungsten." International Journal of Research Publication and Reviews 5, no. 4 (2024): 1622–30. http://dx.doi.org/10.55248/gengpi.5.0424.0942.

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28

Luo, Yunbo, and Faming Zhang. "A Novel Process of Tungsten Flotation for Sustainable Exploitation of Tungsten Resources." Chiang Mai Journal of Science 50, no. 5 (2023): 1–12. http://dx.doi.org/10.12982/cmjs.2023.056.

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Tungsten as key metal in various fields is indispensable metal resource for global economy. Sustainable exploitation of tungsten resources is still challenging. This work makes attempt to solve the difficulty in flotation separation of tungsten minerals from Yaogangxian tungsten ore. Systematical analysis of mineralogical properties of tungsten ore was performed. A process for tungsten flotation from tungsten ore was developed for exploitation of tungsten resources. The major valuable element in the ore is tungsten, and the grade of tungsten is 0.22%. The distribution of scheelite is nonunifor

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29

He, Xue Liang, Zeng Lin Zhou, Qiao Juan Deng, Yan Li, Zhi Lin Hui, and Fu Wang. "Tungsten Matrix Material for Diffusion Barium Tungsten Cathode." Materials Science Forum 913 (February 2018): 846–52. http://dx.doi.org/10.4028/www.scientific.net/msf.913.846.

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As the core component of the diffusion cathode, the performance of porous tungsten matrix material will directly affect the output performance and life of microwave source. Therefore, the preparation of porous tungsten matrix is the key process of making a cathode material. In this paper, the industrial tungsten powder was used as raw material, whose particle size was modulated by fluidic classification firstly. Then via cold isostatic pressing and hydrogen sintering in high temperature, the porous tungsten sintered body was obtained. Finally, by the process of copper infiltration, machining a

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30

Fu, Xiao Ming. "Fine Cemented Carbide Particles Prepared with Activated Tungsten Oxide." Advanced Materials Research 510 (April 2012): 619–22. http://dx.doi.org/10.4028/www.scientific.net/amr.510.619.

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Fine cemented carbide in the diameter of less than 1 μm is obtained activated tungsten oxide. The samples are characterized by laser particle size analyze, electron microscope and sclerometer. The experimental results show that the size of tungsten particles and tungsten carbide prepared with activated tungsten becomes small remarkably, and coarse tungsten particles decrease. The properties of cemented carbide prepared with activated tungsten oxide are better than those of cemented carbide made with blue tungsten oxide. Especially, the hardness of cemented carbide prepared with activated tungs

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31

Han, Zhengdong, Artem Golev, and Mansour Edraki. "A Review of Tungsten Resources and Potential Extraction from Mine Waste." Minerals 11, no. 7 (2021): 701. http://dx.doi.org/10.3390/min11070701.

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Tungsten is recognized as a critical metal due to its unique properties, economic importance, and limited sources of supply. It has wide applications where hardness, high density, high wear, and high-temperature resistance are required, such as in mining, construction, energy generation, electronics, aerospace, and defense sectors. The two primary tungsten minerals, and the only minerals of economic importance, are wolframite and scheelite. Secondary tungsten minerals are rare and generated by hydrothermal or supergene alteration rather than by atmospheric weathering. There are no reported con

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32

Zhang, Lian Meng, Ming Gao, Guo Qiang Luo, Zhuo Chen, and Qiang Shen. "Preparation of Tungsten-Epoxy Composites and FGMs with Density Gradient." Materials Science Forum 631-632 (October 2009): 461–64. http://dx.doi.org/10.4028/www.scientific.net/msf.631-632.461.

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FGMs with density gradient are of great interest in field of dynamic high-pressure physics. In this paper, tungsten particles reinforced epoxy resin composites, and FGMs with density gradient were prepared by calendering technique. Microstructures of tungsten-epoxy composites with various tungsten contents were analyzed, and the density distribution of the FGMs was characterized. The results show that the distribution of tungsten particles in tungsten-epoxy composites is homogeneous, and the combination of tungsten particles with epoxy matrix is good. The density of tungsten-epoxy composites v

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33

Yordanov, Krastin, Aneliya Stoyanova, and Jaroslav Argirov. "Determining the Properties and Structure of Welded Copper Plates and Establishing their Connection with the Temperature Field Distribution in the Studied Zones." Advanced Materials Research 1111 (July 2015): 217–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1111.217.

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The aim of our study is to determine the properties and structure of the material after welding thin copper plates in a shielding medium of inert gas (argon) with unsmeltable tungstic electrode by determining the temperature fields during welding. This welding method is well-known as tungsten inert gas (TIG) welding.

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34

Hu, Ya Fang, Jian Can Yang, and Zhen Liu. "Effect of Doping Elements on High Temperature Properties of Tungsten Products." Materials Science Forum 847 (March 2016): 59–64. http://dx.doi.org/10.4028/www.scientific.net/msf.847.59.

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The tungsten products including tungsten electrode, tungsten filament, tungsten crucible have been widely used in national production. To study their properties at high temperature can provide a basis for improving the production process and the quality of processing as well as reducing production defects, which has important significance for the optimization of the performance and life extension of tungsten products. In this paper the development of tungsten and tungsten products is briefly introduced, the effects of many kinds of doped elements and doped compounds on high temperature mechani

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35

Абдуллин, Х. А., А. А. Азаткалиев, М. Т. Габдуллин, Ж. К. Калкозова, Б. Н. Мукашев та А. С. Серикканов. "Получение наноразмерных порошков оксида вольфрама и вольфрама". Физика твердого тела 61, № 1 (2019): 163. http://dx.doi.org/10.21883/ftt.2019.01.46907.158.

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AbstractNanopowder tungsten oxide and metallic tungsten are obtained via pyrolysis of ammonium metatungstate. Two methods are used for the synthesis of tungsten oxide: the use of a fibrous matrix and pyrolysis of aerosol particles. Tungsten oxide particles are formed during the pyrolysis in air. Metallic tungsten nanoparticles are obtained via subsequent thermal reduction of tungsten oxide in hydrogen. The structure and morphology of the samples are studied with X-ray diffraction and scanning electron microscopy. Tungsten nanopowders with average sizes from 7 to 30 nm are obtained depending on

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36

Nikolaenko, Irina V., Nikolay Kedin, and Gennadii Shveikin. "Two-Step Synthesis of Ultrafine and Nanosized Powders of Tungsten Oxide and Carbide." Advances in Science and Technology 88 (October 2014): 9–14. http://dx.doi.org/10.4028/www.scientific.net/ast.88.9.

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In this work a new method of nanoand ultrafine powder of tungsten oxide and carbide synthesis by means of combinating carbon carrier supported classic liquid-phase precipitation and low-temperature microwave treatment was offered. The full range of intermediate substances obtained during thermolysis, reduction and carbidization precursors to final products were presented. The thermolysis of tungstic acid with the formation of tungsten oxide and carbide ultrafine particles of different modifications were studied. It was shown, that cooling ammonium tungstate solution to 4 °C, and use of carbon

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37

Liu, Lingna, Yi Hou, Xiuzhao Yin, Fang Zhang, and Zifei Peng. "Preparation and investigation of co-doped VO2 powders." Functional Materials Letters 12, no. 02 (2019): 1950015. http://dx.doi.org/10.1142/s1793604719500152.

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In this paper, tungsten-and molybdenum-doped vanadium dioxide (VO[Formula: see text] powders were prepared by hydrothermal reaction using vanadium pentoxide (V2O[Formula: see text], H2O2, white tungstic acid (WPTA) and sodium molybdate (Na2MoO[Formula: see text] as raw materials. The microstructure and composition of VO2 powders were characterized by means of XRD, XPS, DSC and FT-IR. We made a preliminary study on the thermal-induced phase transition properties of powders. The experimental results show that the co-doped samples are monoclinic rutile. Tungsten and molybdenum atoms exist in the

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38

Linyuan, Zhao, Yang Mingqing, and Lv Yong. "Solvothermal Synthesis and Near-Infrared Shielding Properties of Cs0.3WO3/WO3 Composites." International Journal of Nanoscience 19, no. 04 (2020): 1950032. http://dx.doi.org/10.1142/s0219581x19500327.

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The Cs[Formula: see text]WO3/WO3 composite with near-infrared shielding properties was synthesized by the solvothermal method using tungstic acid and cesium salt as raw materials. The as-prepared composites were tested by X-ray powder diffraction, scanning electron microscopy, energy spectrum analysis, transmission electron microscopy, electron energy loss spectroscopy, and ultraviolet-visible near-infrared spectroscopy. The effects of different reaction conditions on the structure and near-infrared shielding properties of the synthesized composites were investigated. The best near-infrared li

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39

Zhu, Rui, Lin Chen, Ming-Hui Ma, Yi-Ding Wu, and Guang-Fa Gao. "The Effect of Doped Diamond Particles on the Mechanical Properties of Tungsten." Journal of Physics: Conference Series 2891, no. 16 (2024): 162024. https://doi.org/10.1088/1742-6596/2891/16/162024.

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Abstract Tungsten, known for its high strength and excellent heat resistance, finds extensive application in military and industrial fields. However, its brittlenes at room temperature limits its broader use. Dispersion strengthening is one of the effective methods to improve the properties of tungsten and its alloys. This study investigates the dispersion strengthening of tungsten by uniformly distributing fine damond particles (0.5 μm) within the tungsten matrix. Quasi-static and dynamic compression tests were conducted on three types of tungsten materials: pure tungsten (W), tungsten with 0

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40

Yang, Chen, Qinghai Guo, Yaowu Cao, and Georgii A. Chelnokov. "Hydrocalumite as well as the Formation of Scheelite Induced by Its Dissolution, Removing Aqueous Tungsten with Varying Concentrations." International Journal of Environmental Research and Public Health 19, no. 14 (2022): 8630. http://dx.doi.org/10.3390/ijerph19148630.

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As a toxic element, tungsten (W) in elevated concentrations, originating from human activities or geological sources, poses a severe threat to the environment. However, there has been a lack of robust remediation techniques focusing on aqueous tungsten contamination with varying initial concentrations, because only recently have the toxicity and the environmental threat of tungsten been fully realized. In this study, the removal of tungsten from an aqueous solution by hydrocalumite was investigated for the first time. Systematic removal experiments were carried out at designated contact time,

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41

Fu, Xiao Ming. "Ultrafine Tungsten Powder Obtained with Violet Tungsten Oxide Using Circulatory Oxidization-Reduction Method." Applied Mechanics and Materials 127 (October 2011): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amm.127.101.

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Violet tungsten oxide is prepared with pure ammonium paratungstate in the argon gas. Tungsten powder is obtained with violet tungsten oxide through deoxidation in the hydrogen gas (Rate of purity: 99.99 %, dew point: -40 °C), and tungsten powder is oxidized in the air. Tungsten oxide is reduced with tungsten powder in the hydrogen gas. The samples are characterized with the laser particle size distribution measuring instrument and field-emission scanning electron microscope. The results show that ultrafine tungsten powder is obtained through circulatory oxidation twice and reduction three time

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42

Wasel, Ola, and Jennifer Freeman. "Comparative Assessment of Tungsten Toxicity in the Absence or Presence of Other Metals." Toxics 6, no. 4 (2018): 66. http://dx.doi.org/10.3390/toxics6040066.

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Tungsten is a refractory metal that is used in a wide range of applications. It was initially perceived that tungsten was immobile in the environment, supporting tungsten as an alternative for lead and uranium in munition and military applications. Recent studies report movement and detection of tungsten in soil and potable water sources, increasing the risk of human exposure. In addition, experimental research studies observed adverse health effects associated with exposure to tungsten alloys, raising concerns on tungsten toxicity with questions surrounding the safety of exposure to tungsten

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Han, Chulwoong, Hyunwoong Na, Hanshin Choi, and Yonghwan Kim. "High Purity Tungsten Spherical Particle Preparation From WC-Co Spent Hard Scrap." Archives of Metallurgy and Materials 60, no. 2 (2015): 1507–9. http://dx.doi.org/10.1515/amm-2015-0162.

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Abstract Tungsten carbide-cobalt hard metal scrap was recycled to obtain high purity spherical tungsten powder by a combined hydrometallurgy and physical metallurgy pathway. Selective leaching of tungsten element from hard metal scrap occurs at solid / liquid interface and therefore enlargement of effective surface area is advantageous. Linear oxidation behavior of Tungsten carbide-cobalt and the oxidized scrap is friable to be pulverized by milling process. In this regard, isothermally oxidized Tungsten carbide-cobalt hard metal scrap was mechanically broken into particles and then tungsten t

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Deng, Pan, Lili Cheng, Alin Li, Zhiyong Zeng, and Chunfa Liao. "Recent Advances in the Utilization of Tungsten Residue: A Mini Review of China." Metals 13, no. 8 (2023): 1481. http://dx.doi.org/10.3390/met13081481.

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As a metal of strategic value, tungsten plays an important part in civil and military applications. Currently, China is the biggest tungsten producer all over the world, and the metallic smelting technologies for tungsten are well established. However, the harmless recovery and treatment procedures for tungsten residue remain rather underdeveloped. The treatment of tungsten residue generally includes the recovery of valuable metals (e.g., scandium, tantalum, and niobium) and the solidification of toxic elements (e.g., arsenic, lead, and chromium), which may control the transfer of these elemen

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Dadvand, M., and O. Savadogo. "Pitting Corrosion and Mechanical Properties of Direct Current and Pulsed Reverse Current Electrodeposited Nickel-Tungsten Coatings." Journal of New Materials for Electrochemical Systems 25, no. 2 (2022): 126–34. http://dx.doi.org/10.14447/jnmes.v25i2.a06.

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The electrochemical corrosion and mechanical properties of direct current and pulsed reverse current electrodeposited nickel and nickel-tungsten were investigated by using cyclic polarization measurement and nano-indentation techniques. Direct and pulsed reverse current electrodeposited nickel-tungsten coatings revealed a significant higher resistance to pitting corrosion when compared to direct and pulsed reverse current deposited nickel. Furthermore, pulsed reverse current electrodeposited nickel-tungsten displayed the most noble corrosion potential and higher corrosion resistance compared t

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Fu, Xiao Ming. "Preparation of Medium-Sized Tungsten Particles via the New Method." Advanced Materials Research 562-564 (August 2012): 212–15. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.212.

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Medium-sized tungsten particles are obtained through circulatory oxidation-reduction twice. The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). Blue tungsten oxide (BTO) is prepared with ammonium paratungstate (APT) in the argon gas. Tungsten powders are obtained with BTO through deoxidation in the hydrogen gas (Rate of purity: 99.99%, dew point: -40°C), and tungsten powders are oxidized in the air. Tungsten oxide WO3) is reduced into tungsten powders in hydrogen gas again. The routes are repeated. The volume percent content of medium-sized tun

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Fu, Xiao Ming. "Submicron Tungsten Powder with Violet Tungsten Oxide via the Circulatory Oxidization-Reduction Method." Applied Mechanics and Materials 320 (May 2013): 251–54. http://dx.doi.org/10.4028/www.scientific.net/amm.320.251.

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Submicron tungsten powder is obtained through oxidation twice and reduction three times. The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). Violet tungsten oxide (VTO) is prepared with ammonium paratungstate (APT) in the argon gas. Tungsten powder is obtained with VTO through deoxidation in the hydrogen gas (Rate of purity: 99.99%, dew point: -40°C), and tungsten powders are oxidized in the air. Tungsten oxide WO3) is reduced into tungsten powders in hydrogen gas again. The routes are repeated. The volume percent content of submicron tungsten

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Zhong, Li Sheng, Yun Hua Xu, Peng Yu, Xiao Jie Liu, Fang Xia Ye, and Hong Hua Yan. "Microstructure and Abrasive Wear Characteristics of In Situ WC Bundles – Reinforced Iron Matrix Composites." Advanced Materials Research 284-286 (July 2011): 265–68. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.265.

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An in-situ synthesis process combining an infiltration casting with a subsequent heat treatment was applied to fabricate special tungsten carbide (WC) bundles-reinforced iron matrix composites in this work. The microstructure and wear-resistance of the tungsten carbide bundles reinforced iron matrix composites were studied by using scanning electron microscopy, X-ray diffraction and wear tester. Results showed that the tungsten carbide bundles distributed in the matrix with the center-to-center spacing 2.2 mm, and the diameter of each tungsten carbide bundle is about 1 mm. Most of the tungsten

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Shao, Yang, Weikang Yu, Jifei Wu, and Haiwen Ma. "Effect of Sintering Temperatures on Grain Coarsening Behaviors and Mechanical Properties of W-NiTi Heavy Tungsten Alloys." Materials 15, no. 22 (2022): 8035. http://dx.doi.org/10.3390/ma15228035.

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W-NiTi tungsten heavy alloys were prepared by an infiltration process using submicron W powders, and the effect of sintering temperatures on grain-coarsening behaviors and the mechanical properties of W-NiTi tungsten heavy alloys were investigated. The microstructures and mechanical properties were investigated using scanning electron microscopy, X-ray diffraction and compression tests. The results showed that tungsten particles were uniformly distributed in the NiTi binder. The W-NiTi tungsten heavy alloys consisted of B19′-NiTi and body-centered cubic W phases. The average tungsten particle

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Sevcenco, Ana-Maria, Loes E. Bevers, Martijn W. H. Pinkse, et al. "Molybdenum Incorporation in Tungsten Aldehyde Oxidoreductase Enzymes from Pyrococcus furiosus." Journal of Bacteriology 192, no. 16 (2010): 4143–52. http://dx.doi.org/10.1128/jb.00270-10.

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ABSTRACT The hyperthermophilic archaeon Pyrococcus furiosus expresses five aldehyde oxidoreductase (AOR) enzymes, all containing a tungsto-bispterin cofactor. The growth of this organism is fully dependent on the presence of tungsten in the growth medium. Previous studies have suggested that molybdenum is not incorporated in the active site of these enzymes. Application of the radioisotope 99Mo in metal isotope native radioautography in gel electrophoresis (MIRAGE) technology to P. furiosus shows that molybdenum can in fact be incorporated in all five AOR enzymes. Mo(V) signals characteristic

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