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Relevant bibliographies by topics / Fe-Co-W alloys

Academic literature on the topic 'Fe-Co-W alloys'

Author: Grafiati

Published: 21 September 2022

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Journal articles on the topic "Fe-Co-W alloys"

1

Nakajima, Kenya, Marc Leparoux, Hiroki Kurita, Briac Lanfant, Di Cui, Masahito Watanabe, Takenobu Sato, and Fumio Narita. "Additive Manufacturing of Magnetostrictive Fe–Co Alloys." Materials 15, no. 3 (January 18, 2022): 709. http://dx.doi.org/10.3390/ma15030709.

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Fe–Co alloys are attracting attention as magnetostrictive materials for energy harvesting and sensor applications. This work investigated the magnetostriction characteristics and crystal structure of additive-manufactured Fe–Co alloys using directed energy deposition. The additive-manufactured Fe–Co parts tended to exhibit better magnetostrictive performance than the hot-rolled Fe–Co alloy. The anisotropy energy ΔK1 for the Fe–Co bulk, prepared under a power of 300 W (referred to as bulk−300 W), was larger than for the rolled sample. For the bulk−300 W sample in a particular plane, the piezomagnetic constant d was large, irrespective of the direction of the magnetic field. Elongated voids that formed during additive manufacturing changed the magnetostrictive behavior in a direction perpendicular to these voids. Magnetic property measurements showed that the coercivity decreased. Since sensors should be highly responsive, Fe–Co three-dimensional parts produced via additive manufacturing can be applied as force sensors.

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2

Bobanova, Zhanna, Vladimir Petrenko, Natalia Tsyntsaru, and Alexandr Dikusar. "Leveling Power of Co-W and Fe-W Electrodeposited Coatings." Key Engineering Materials 813 (July 2019): 248–53. http://dx.doi.org/10.4028/www.scientific.net/kem.813.248.

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The leveling power of gluconate and citrate electrolytes used to obtain the Co-W and Fe-W alloys was studied. The leveling power parameter P was calculated according to the results of profilographic measurements of microprofile carried out before and after deposition of the coating on surface. It was shown that deposition of said alloys occurs with preferential coating thickness increase on microprofile peaks and low microlevelling power.

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Mashimo, Tsutomu, Xu Fan, and Xin Sheng Huang. "Metastable Transition-Metal System Bulk Alloys Prepared by MA and Shock Compression." Materials Science Forum 539-543 (March 2007): 1937–42. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1937.

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Mechanical alloying (MA), super cooling process, etc. have been used to prepare amorphous phases, metastable solid solutions, nanocrystals, and so on. It is important to consolidate these powders for evaluating the physical properties, and for applications. On the other hand, shock compression can be used as an effective consolidation method for metastable material powders without recrystallization or decomposition. We had prepared metastable transition-metal system bulk alloys and compounds (Fe-Co, Fe-Cu, Fe-W, Co-Cu, Sm-Fe-N systems, etc) by using MA and shock compression. The Fe-Cu and Co-Cu metastable solid solutions showed a fit curve to the Slater-Pauling one. The Co-Cu metastable solid solution bulk alloy showed a magneto-resistance. The Fe-Co fine-grained bulk alloys show the higher coeicivity than that of molten alloy. In this paper, the preparation and magnetic properties of the metastable alloys (Fe-Co, Fe-Cu, Co-Cu systems) are reviewed, and the applications to materials science and engineering are discussed.

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Yar-Mukhamedova, G., M. Ved’, I. Yermolenko, N. Sakhnenko, A. Karakurkchi, and A. Kemelzhanova. "Effect of Electrodeposition Parameters on the Composition and Surface Topography of Nanostructured Coatings by Tungsten with Iron and Cobalt." Eurasian Chemico-Technological Journal 22, no. 1 (March 26, 2020): 19. http://dx.doi.org/10.18321/ectj926.

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The electrodeposition of binary and ternary coatings Fe-W and Fe-Co-W from mono ligand citrate electrolyte has been investigated. The Fe-Co-W coatings were formed from electrolytes, which composition differs in the ratio of the concentrations of the alloying components and the ligand content. The investigation results indicate a competitive reduction of iron, cobalt and tungsten, the nature of which depends both on the ratio of electrolyte components, and electrolysis parameters. The effect of both current density amplitude and pulse on off time on quality, composition and surface morphology of the galvanic alloys was determined. Coatings deposited on a direct current with a density of more than 6.5 A/dm2, crack and peel off from the substrate due to the inclusion of Fe (III) compounds containing hydroxide anions. The use of non-stationary electrolysis allows us to extend the working range of current density to 8.0 A/dm2 and form electrolytic coatings of sufficient quality with significant current efficiency and the content of the refractory component. The presence of the Co7W6, Fe7W6, α-Fe, and Fe3C phases detected in the Fe-Co-W deposits reflects the competition between the alloying metals reducing from hetero-nuclear complexes. The surface of binary and ternary coatings is characterized by the presence of spherical agglomerates and is more developed in comparison with steel substrate. The parameters Ra and Rq for electrolytic alloy Fe-W are of 0.1, for Fe-Co-W are 0.3, which exceeds the performance of a polished steel substrate (Ra = 0.007 and Rq = 0.010). These properties prospect such alloys as a multifunctional layer are associated with structural features, surface morphology, and phase composition.

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Sun, G. Y., G. Chen, and Guo Liang Chen. "Plastic Deformation Behavior of Bulk Metallic Glass Composite Containing Spherical Ductile Crystalline Precipitates." Materials Science Forum 539-543 (March 2007): 1943–50. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1943.

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Mechanical alloying (MA), super cooling process, etc. have been used to prepare amorphous phases, metastable solid solutions, nanocrystals, and so on. It is important to consolidate these powders for evaluating the physical properties, and for applications. On the other hand, shock compression can be used as an effective consolidation method for metastable material powders without recrystallization or decomposition. We had prepared metastable transition-metal system bulk alloys and compounds (Fe-Co, Fe-Cu, Fe-W, Co-Cu, Sm-Fe-N systems, etc) by using MA and shock compression. The Fe-Cu and Co-Cu metastable solid solutions showed a fit curve to the Slater-Pauling one. The Co-Cu metastable solid solution bulk alloy showed a magneto-resistance. The Fe-Co fine-grained bulk alloys show the higher coeicivity than that of molten alloy. In this paper, the preparation and magnetic properties of the metastable alloys (Fe-Co, Fe-Cu, Co-Cu systems) are reviewed, and the applications to materials science and engineering are discussed.

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6

Ved', M., N. Sakhnenko, T. Nenastina, M. Volobuyev, and I. Yermolenko. "Corrosion and mechanical properties of nanostructure electrolytic Co-W and Fe-Co-W alloys." Materials Today: Proceedings 50 (2022): 463–69. http://dx.doi.org/10.1016/j.matpr.2021.11.293.

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7

Belevskii, Stanislav, Serghei Silkin, Natalia Tsyntsaru, Henrikas Cesiulis, and Alexandr Dikusar. "The Influence of Sodium Tungstate Concentration on the Electrode Reactions at Iron–Tungsten Alloy Electrodeposition." Coatings 11, no. 8 (August 18, 2021): 981. http://dx.doi.org/10.3390/coatings11080981.

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The investigation of Fe-W alloys is growing in comparison to other W alloys with iron group metals due to the environmental and health issues linked to Ni and Co materials. The influence of Na2WO4 concentration in the range 0 to 0.5 M on bath chemistry and electrode reactions on Pt in Fe-W alloys’ electrodeposition from citrate electrolyte was investigated by means of rotating disk electrode (RDE) and cyclic voltammetry (CV) synchronized with electrochemical quartz crystal microbalance (EQCM). Depending on species distribution, the formation of Fe-W alloys becomes thermodynamically possible at potentials less than −0.87 V to −0.82 V (vs. Ag/AgCl). The decrease in electrode mass during cathodic current pass in the course of CV recording was detected by EQCM and explained. The overall electrode process involving Fe-W alloy formation may be described using formalities of mixed kinetics. The apparent values of kinetic and diffusion currents linearly depend on the concentration of Na2WO4. Based on the values of partial currents for Fe and W, it was concluded that codeposition of Fe-W alloy is occurring due to an autocatalytic reaction, likely via the formation of mixed adsorbed species containing Fe and W compounds or nucleation clusters containing both metals on the electrode surface.

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Nagase, Takeshi, Mitsuharu Todai, and Takayoshi Nakano. "Development of Co–Cr–Mo–Fe–Mn–W and Co–Cr–Mo–Fe–Mn–W–Ag High-Entropy Alloys Based on Co–Cr–Mo Alloys." MATERIALS TRANSACTIONS 61, no. 4 (April 1, 2020): 567–76. http://dx.doi.org/10.2320/matertrans.mt-mk2019002.

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9

Raghavan, V. "Co-Fe-W (cobalt-iron-tungsten)." Journal of Phase Equilibria 15, no. 5 (October 1994): 528–29. http://dx.doi.org/10.1007/bf02649408.

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10

Rao, A. Sambasiva, M. K. Mohan, and A. K. Singh. "Solidification behavior and microstructural characterization of Ni–Fe–W and Ni–Fe–W–Co matrix alloys." International Journal of Materials Research 109, no. 7 (July 12, 2018): 599–614. http://dx.doi.org/10.3139/146.111647.

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Dissertations / Theses on the topic "Fe-Co-W alloys"

1

Capel, Hollie. "Deposition, microstructure & properties of Co-W & Co-W-Fe alloys." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404038.

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Galimberti, Paolo. "Equilibres de phases, microstructures et propriétés mécaniques d’alliages." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0062.

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L'étude a été réalisée dans le cadre d'un développement industriel de poudres métalliques destinées à la fabrication d'outils diamantés. Le travail a porté sur les alliages ternaires Fe-Co-W et Fe-Co-Mo. La détermination expérimentale d'équilibres de phases a été effectuée entre 930°C et 1400°C à partir de nuances équilibrées et sur la base de couples de diffusion. Plusieurs compositions ont été choisies pour développer de nouvelles nuances à caractéristiques mécaniques élevées. Le durcissement des alliages obtenu par traitement thermique a été étudié dans deux nuances Fe-20Co-18W et Fe-27Co-8Mo (compositions en masse). L'analyse en diffraction des rayons X complétée par des observations en microscopie électronique en transmission permet de relier l'évolution du durcissement et la microstructure des alliages. La détermination de la séquence de précipitation dans les systèmes étudiés a permis de proposer des nuances d'alliages et les traitements thermiques associés compatibles avec le procédé de fabrication et les performances mécaniques visées
The study was carried out in order to develop metallic powders for the diamond tools. The work was focused on Fe-Co-W and Fe-Co-Mo ternary alloys. Phase equilibria were determined between 930°C and 1400°C owing to annealed alloys and also on the basis of diffusion couples. Several compositions were selected to develop new alloys with high mechanical properties. The effect of thermal treatments on the hardening of the alloys was studied for two compositions Fe-20Co-18W et Fe-27Co-8Mo (in mass). The evolution of hardening as a function of the microstructure features was examined using X-ray diffraction and transmission electron microscopy. The sequence of precipitation was determined. New alloys and associated thermal treatment suitable to industrial manufacturing are proposed

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Liu, Kuo-Shi, and 劉國璽. "Study on the Nano-structured W-Ni-Fe-Co Tumgsten Heavy Alloy by Mechanical Alloying." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/53270779992223070124.

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碩士
義守大學
材料科學與工程學系
92
Abstract The composition of 93W-3.0Ni-2.0Fe-2.0Co and 93W-3.5Ni-1.5Fe-2.0Co heavy tungsten alloys were selected for investigating the microstructure evolution of powder synthesis by mechanical alloying（MA）with Spex mill and Vibratory mill, respectively . The microstructure characterization of the MA powders was conducted by means of SEM ,TEM and XRD techniques. The results reveal that the particle size of the alloy powder reaches about 2~3μm when the heavy tungsten alloy mechanically alloyed 8 hours by Spex mill or 72 hours by Vibratory mill . In addition, the inner crystal size was found to be a nano-scaled cell structure with the dimension about 16nm Therefore , MA is an effective method to refine the powder . The result of these refined heavy tungsten alloy powders after cold isostatic pressing（CIP）and solid phase sintering also verified the effect of nano-structured powders on decreasing the sintering temperature as well as increasing densification . However, in order to comply with the specification of “ Kinetic Energy Penetrator ”, the sintered product of these refined heavy tungsten powders need to be further improved their density and hardness by means of high temperature and high strain rate forging .

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Hsu, C. T., and 許傳宗. "Study on the Processing and Properties of Solid-Phase Sintering in W-Ni-Fe-Co Tungsten Heavy Alloy." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31406402333243373955.

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碩士
義守大學
材料科學與工程學系
92
Recently, the high performance heavy tungsten alloy as the core material of piercing bullets has replaced the depleted uranium alloy. Because of the high melting temperature of tungsten element, the W-Ni-Fe-Co alloy only can be fabricated by powder metallurgical process. In the present work, the alloy powders with composition of 93W-3Ni-2Fe-2Co and 93W-3.5Ni-1.5Fe-2Co were synthesized by mechanical alloying those pure elements by using Spex mill as well as vibratory mill. The result revealed that the crystal cell size of the tungsten heavy alloy powder reaches around 10~23 nm after mechanical milling 8 hours by Spex mill or 72 hours by vibratory mill. In parallel, the mechanically alloyed powders were compressed by cold isostatic pressing (CIP) and vacuum sintered into the bulk specimen. The microstructure of the sintered tungsten heavy alloy presents a tungsten matrix co-existing with another phase of irregular shape which distributing around the gap among those tungsten particles. These phases of irregular shape were analyzed containing the Fe7W6 intermetallic compound and the Fe-Ni solid solution. In addition, there is not any porosity can be found in the tungsten heavy alloy after solid phase sintering. On contrary, it was found many retained pores in the tungsten heavy alloy after liquid phase sintering. However, the liquid phase sintered specimen exhibits higher hardness and lower ductility than the solid phase sintered specimen.

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Books on the topic "Fe-Co-W alloys"

1

Kawazoe, Y., U. Carow-Watamura, and J. Z. Yu, eds. Physical Properties of Ternary Amorphous Alloys. Part 2: Systems from B-Be-Fe to Co-W-Zr. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-13850-8.

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Book chapters on the topic "Fe-Co-W alloys"

1

Yamamoto, Keisuke, Yoshisato Kimura, and Yoshinao Mishima. "Precipitation Behavior and Phase Stability of Intermetallic Phases in Fe-Cr-W-Co Ferritic Alloys." In Materials Science Forum, 845–48. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.845.

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Zhang, Lifeng, Jianwei Gao, Lucas Nana Wiredu Damoah, and David G. Robertson. "Iron: Removal from Aluminum." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000434.

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In this paper, the Fe-rich phases in and their detrimental effect on aluminum alloys are summarized. The existence of brittle platelet β-Fe-rich phases lowers the mechanical properties of aluminum alloys. The methods to neutralize the detrimental effect of iron are discussed. The use of high cooling rate, solution heat treatment, and addition of elements such as Mn, Cr, Be, Co, Mo, Ni, V, W, Cu, Sr, or the rare earth elements Y, Nd, La, and Ce are reported to modify the platelet Fe-rich phases in aluminum alloys. The mechanism of the modification is briefly described. Technologies to remove iron from aluminum are reviewed extensively. The precipitation and removal of Fe-rich phases (sludge) are discussed. The dense phases can be removed by methods such as gravitational separation, electromagnetic (EM) separation, and centrifuge. Other methods include electrolysis, electro-slag refining, fractional solidification, and fluxing refining. The expensive three-layer cell electrolysis process is the most successful technique to remove iron from aluminum so far.

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WATANABE, Tohru, and Yoshimi TANABE. "PREPARATION AND PHYSICAL PROPERTIES OF Fe-W AND Co-W AMORPHOUS ALLOYS BY ELECTROPLATING METHOD." In Rapidly Quenched Metals, 127–31. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-444-86939-5.50037-3.

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Kublanovsky, Valeriy S., Oksana L. Bersirova, Yulia S. Yapontseva, Tetyana V. Maltseva, Vasyl M. Nikitenko, Eugen A. Babenkov, Sergei V. Devyatkin, et al. "Electrochemical synthesis of nanostructured super-alloys with valuable electrochemical, electrocatalytic and corrosion properties." In NEW FUNCTIONAL SUBSTANCES AND MATERIALS FOR CHEMICAL ENGINEERING, 130–45. PH “Akademperiodyka”, 2021. http://dx.doi.org/10.15407/akademperiodyka.444.130.

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A study of the electrochemical formation of functional coatings by binary and ternary alloys M1M2, M1M3, M1M2M3 (where M1 is 3d6-8 metal of the iron subgroup: Fe, Co, Ni, and M2 is Mo, W; M3 is Re), from complex aqueous solutions and ionic melts. Such alloys are called "superalloys" due to a wide range of valuable physicochemical (corrosive, electrocatalytic) and functional properties and are designed to operate in extreme temperature and power modes with simultaneous exposure to an aggressive environment. The presence of rhenium in the alloy also simultaneously increases its strength and ductility (the so-called "rhenium effect"). A fundamentally new electrolyte (highly concentrated ammonia-acetate) has been developed for the formation of molybdenum alloys (NiMo, CoMo, FeMo) with a maximum content of a refractory component (about 85 at.%), such as those that exhibit a high electrocatalytic effect in the hydrogen evolution reaction (HER). The deposition of binary CoRe and ternary CoWRe alloys from a citrate electrolyte was carried out. The influence of the composition of solutions and electrolysis parameters on the chemical and phase composition, structure and properties of coatings has been established. The parameters of pulse electrolysis for obtaining multilayer CoMo and CoW coatings from carbamide melts containing cobalt and molybdenum / tungsten oxides have been determined.

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Conference papers on the topic "Fe-Co-W alloys"

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Vernickaite, E., H. Cesiulis, and N. Tsyntsaru. "EVALUATION OF CORROSION AND TRIBOLOGICAL BEHAVIOR OF ELECTRODEPOSITED TUNGSTEN ALLOYS." In BALTTRIB. Aleksandras Stulginskis University, 2017. http://dx.doi.org/10.15544/balttrib.2017.36.

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Tungsten alloy coatings with iron group metals (Ni, Fe, Co) are considered as advanced materials for various surface engineering applications. Such coatings should be resistant to mechanical and corrosive damage, and to have improved functionality and durability. Accordingly, the objectives of this review consist in a comparative study of available literature on corrosive and wear behavior of electrodeposited tungsten alloys with iron group metals, including our recent results on evaluation of electrodeposited Co-W coatings. The wear and corrosion resistance of Ni-W, Fe-W and Co-W strongly depends on the chosen deposition conditions and subsequently on tungsten content and structure of obtained protective coatings.

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Pike, L. M., and S. K. Srivastava. "Long Term Thermal Stability of Several Gas Turbine Alloys." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68959.

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Ever increasing demands for lower gas turbine operating costs have led to the need for longer lasting components. This in turn, requires the availability of alloys which are reliable to such long lifetimes. In the mill produced condition, most alloys have desirable microstructures and mechanical properties. However, after exposure to the harsh temperatures found in gas turbine engines, the microstructures of most alloys will begin to change. The effects on the mechanical properties of such microstructural changes can range from mild deterioration to significant degradation. In this paper, the effects of thermal exposures at temperatures from 1200 to 1600°F for durations up to one year on the mechanical properties of three wrought gas turbine alloys will be reported. The alloys will include HAYNES® 188 alloy (Co-Ni-Cr-W), HAYNES 230® alloy (Ni-Cr-W), and HAYNES HR-120® alloy (Fe-Ni-Cr-Nb-N).

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ADAM, Ondřej, and Vít JAN. "Influence of milling time on the microstructure of immiscible Cu-Fe-Co-w alloy prepared by powder metallurgy." In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3613.

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Vesely, Andreas. "Processes for the Treatment of NORM and TENORM." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4623.

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By contract with the Austrian government, the ARC is treating radioactive waste from research institutions and industries. In the last years, one focus was the development of processes for the treatment of NORM and TENORM. Our goal in developing such processes is to recycle valuable compounds for further industrial usage and to concentrate the radioactive elements as far as possible, to save space in the waste storage facilities. Austria is an important producer of tungsten-thoria- and tungsten-molybdenum-thoria-cermets. Scrap is generated during the production process in the form of turnings and grinding sludge and dust. Although big efforts have been undertaken to replace Thorium compounds, waste streams from past production processes are still waiting for treatment. The total amount of this waste stored in Austria may be estimated to be approx. 100 tons. In close co-operation with the tungsten industries, recycling processes were tested and further developed at ARC in laboratory, bench scale and pilot plants. Three different approaches to solve the problem were studied: Dissolution of tungsten in molten iron in an arc or induction furnace, thus producing an Fe-W or Fe-W-Mo alloy. Slag is produced upon the addition of lime and clay. This slag extracts nearly all of the Thorium contained in the metal melt. Selective dissolution of Tungsten in aqueous alkaline medium after oxidation of the metal to the hexavalent state by heating the scrap in air at temperatures of 500°C to 600°C. The resulting oxides are treated with sodium hydroxide solution. Tungsten and Molybdenum oxides are readily dissolved, while Thorium oxide together with silicon and aluminum compounds remain insoluble and are separated by filtration. Sodium tungstate solution is further processed by the usual hydrometallurgical tungsten mill process. Oxidation and dissolution of Tungsten can be achieved in one step by an electrochemical process. Thus, thoriated Tungsten scrap is used as an anode in an electrolysis cell, while sodium hydroxide or ammonia serve as electrolyte. After dissolution of Tungsten, the solids are separated from the liquid by filtration. With the electrochemical process, treatment of Tungsten-Thoria scrap can be achieved with high throughput in rather small reactors at moderate temperatures and ordinary pressure. The Tungsten solution exhibits high purity. Another process which we examined in detail is the separation of radium from rare earth compounds. Radium was separated by co-precipitation with barium sulfate from rare earth chloride solutions. The efficiency of the separation is strongly pH-dependent. Again, the valuable rare earth compound can be reused, and the radioactive elements are concentrated.

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