Journal articles: 'Carbure de tungstène'

1

Sow, Libasse, Siham Kamali-Bernard, Olivier Bartier, Gérard Mauvoisin, and Fabrice Bernard. "Tests d’indentation instrumentée sur granulats de Mâchefers d’Incinération de Déchets Non Dangereux. Influence de la taille de l’indenteur sur le module élastique." MATEC Web of Conferences 261 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201926101002.

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Des tests d’indentation instrumentée ont été effectués sur des particules isolées de Mâchefers d’Incinération de Déchets Non Dangereux (MIDND) provenant des carrières de la Garenne à Vignoc (Bretagne, France). Deux indenteurs sphériques en carbure de tungstène de rayon respectifs 0,5 et 140 mm ont été utilisés pour les séries de tests «A» et «B». Les particules étudiées ont des diamètres variant entre 20 et 25 mm. Avec un indenteur de rayon 0,5 mm, des modules élastiques réduits moyens variant de 15 à 68 GPa ont été trouvés. Un module élastique réduit moyen de 15 GPa a été trouvé avec l’indenteur de rayon 140 mm.

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Liao, H., and C. Coddet. "Relations entre la microstructure et le comportement à l’abrasion des cermets carbure de tungstène-cobalt." Revue de Métallurgie 91, no. 9 (September 1994): 1366. http://dx.doi.org/10.1051/metal/199491091366.

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Pastor, H. "1996 : Centenaire de la découverte du carbure de tungstène par Henri Moissan ; historique du développement de ce matériau." Revue de Métallurgie 94, no. 12 (December 1997): 1537–52. http://dx.doi.org/10.1051/metal/199794121537.

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4

Khanafi-Benghalem, N., K. Loucif, E. Felder, and F. Delamare. "Influence de la température sur les mécanismes de frottement et d’usure des aciers X12NiCrMoSi25-20 et 25CrMo4 glissant sur du carbure de tungstène." Matériaux & Techniques 93, no. 9-12 (September 2005): 347–62. http://dx.doi.org/10.1051/mattech:2006015.

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5

Zhudra, A. P. "Tungsten carbide based cladding materials." Paton Welding Journal 2014, no. 6 (June 28, 2014): 66–71. http://dx.doi.org/10.15407/tpwj2014.06.13.

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6

Myachina, Maria, Natalia Gavrilova, Ksenia Poluboyarinova, and Victor Nazarov. "Molybdenum–Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides." Nanomaterials 11, no. 3 (March 17, 2021): 761. http://dx.doi.org/10.3390/nano11030761.

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Herein, we demonstrate a promising method for the synthesis of ultrafine carbide particles using dispersions of molybdenum–tungsten nanoparticles. Dispersions of molybdenum–tungsten blue nanoparticles with different initial molar ratios of molybdenum/tungsten were synthesized through the reduction of molybdate and tungstate ions by ascorbic acid in an acidic medium (pH = 1.0–2.5). Molybdenum–tungsten blue nanoparticles were characterized by ultraviolet–visual (UV–VIS), infrared (FTIR), and X-ray photoelectron (XPS) spectroscopies; transmission electronic microscopy (TEM); and dynamic light scattering (DLS). We demonstrated that molybdenum–tungsten blue nanoparticles belong to toroidal polyoxometalate clusters (λmax = 680–750 nm) with a predominant particle size of 4.0 nm. Molybdenum–tungsten blue dispersions were shown to be monodispersed systems with a small particle size and long-term stability (>30 days) and are suitable for further catalytic applications.

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7

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 carrier on the precipitation stage can increase specific surface area from 20 to 100 m2g-1. With the use of SEM precursors particles size were examined (∼200 nm) and the morphology of initial, intermediate and final products was shown.

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Myachina, Maria, Natalia Gavrilova, Ksenia Poluboyarinova, and Victor Nazarov. "Properties of Molybdenum–Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides." Materials Proceedings 4, no. 1 (November 11, 2020): 1. http://dx.doi.org/10.3390/iocn2020-07894.

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A promising method for the synthesis of ultrafine carbide particles is the sol–gel method using dispersions of molybdenum–tungsten nanoparticles. For further use, the main properties of molybdenum-blue nanoparticles, including the size, structure, and stability, under different conditions must be determined. The synthesis of dispersions of molybdenum–tungsten blue was carried out as a result of the reduction of molybdate and tungstate ions in the presence of hydrochloric acid. Ascorbic acid was chosen as a reducing agent and further acted as a carbon source. Dispersions and nanoparticles were investigated by transmission electronic microscopy (TEM), UV/vis and infrared (FTIR) spectroscopy, and dynamic light scattering (DLS).

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9

Gomes, J. M., A. E. Raddatz, and T. G. Carnahan. "Preparation of Tungsten Carbide by Gas Sparging Tungstate Melts." JOM 37, no. 12 (December 1985): 29–32. http://dx.doi.org/10.1007/bf03259964.

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10

Malyshev, Victor, Angelina Gab, and Marcelle Gaune-Escard. "Codeposition of Silver with Tungsten Carbide in Tungstate Melts." ECS Transactions 3, no. 35 (December 21, 2019): 423–28. http://dx.doi.org/10.1149/1.2798686.

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11

Jia, Xiao Ming, Yue Xin Song, and Suo Xia Hou. "Inhibition Effect of Compound Boricacidester on the Tungsten Carbide Leaching of the Cemented Carbide Tool." Advanced Materials Research 418-420 (December 2011): 977–81. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.977.

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Working fluid is commonly used in the making and using progress of cemented carbide tool. The tungsten carbide leaching of cemented carbide tool will be resulted in by the sodium carbonate in cutting fluid, because of the tungsten carbide will occur oxidative dissolution. The inhibitor that suppress tungsten carbide leaching of cemented carbide tool is investigated by soaking experiments, friction experiments, SEM analysis, and energy spectrum analysis. The test result shows that aqueous solution and sodium carbonate will cause tungsten carbide leaching through oxidative dissolution; but compound boricacidester contain benzotriazole could suppress tungsten carbide leaching. The Inhibition mechanism is that compound boricacidester contain benzotriazole could generate complete and compact protective film on the surface of cemented carbide tool, therefore, tungsten carbide leaching is inhibited. Add compound boricacidester contain benzotriazole to the water-based cutting fluid could suppress tungsten carbide leaching effectively.

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12

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 tungsten oxide increases by about 7 %.

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13

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 carbides agglomerated, but still there were tungsten carbide particles and the size of tungsten carbide particle was about 10—15 μm. The weight loss of the tungsten carbides bundle reinforced iron matrix composites increased with the increase of the loads and the weight loss of the composites is much less than those of the gray cast iron under the same condition. The wear mechanism of tungsten carbide bundles-reinforced iron matrix composites appears as: micro-cutting, micro-ploughing, broken tungsten carbide and broken particles re-embedded in the matrix.

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14

Yamashita, Yorihiro, Yoshinori Funada, Takahiro Kunimine, Yuji Sato, and Masahiro Tsukamoto. "Formation of Cemented Tungsten Carbide Layer with Compositional Gradient Processed by Directed Energy Deposition." Materials Science Forum 1016 (January 2021): 1676–81. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1676.

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In order to partially improve the wear resistance for dies and jigs, layer-forming technologies for adding cemented tungsten carbide is effective way as an additive manufacturing technique. As one of the layer-forming technologies, directed energy deposition (DED) has attracted much attention from industry. However, many cracks are usually observed inside a formed layer processed by the DED due to the difference of material properties between an iron-based substrate and a cladded cemented tungsten carbide layer. In terms of durability of the formed layer, the crack formation is not preferable as well. In this study, as an attempt to suppress the crack initiation and propagation in cladded layers processed by the DED, formation of compositionally graded cemented tungsten carbide layer was performed by inserting a layer with low to medium tungsten carbide content between the substrate and cemented tungsten carbide layer. At first, single layers of cemented tungsten carbide having various tungsten carbide content were formed on iron-based substrates by the DED processing to understand the relationships between the tungsten carbide content and the number of formed cracks. By considering these experimental results, the compositionally graded cemented tungsten carbide layers were optimized. It was revealed that the crack initiation and propagation could be suppressed by compositionally graded cemented tungsten carbide layers.

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15

Lee, Ho-Shik, Min-Woo Cheon, and Yong-Pil Park. "Surface Properties of Re-Ir Coating Thin Film on Tungsten Carbide Surface." Journal of the Korean Institute of Electrical and Electronic Material Engineers 24, no. 3 (March 1, 2011): 219–23. http://dx.doi.org/10.4313/jkem.2011.24.3.219.

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16

Jia, Xiao Ming, Xiu Ling Zhang, Yue Xing Song, and Xiao Xin Chen. "Experimental Study on Inhibitory Action of Inhibitors on the Tungsten Carbide Leaching of the Cemented Carbide Tool." Applied Mechanics and Materials 29-32 (August 2010): 508–12. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.508.

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The influence of some commonly used inhibitors on the tungsten carbide leaching of the cemented carbide tool was studied by energy spectrum analysis and electrochemical gaging. And the mechanism of the tungsten carbide leaching and be inhibited of the cemented carbide was discussed. The test results showed that when cemented carbide tool were soaked in tri-sodium phosphate and sodium carbonate anhydrous the tungsten carbide in the cemented carbide tool leached out for hydration. And benzotriazole has a good inhibitory effect on the tungsten carbide leaching of the cemented carbide tool.

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17

Tsurimoto, Seji, Toshimichi Moriwaki, and Masafumi Nagata. "Machinability of CBN Tool in Turning of Tungsten Carbide." Key Engineering Materials 523-524 (November 2012): 70–75. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.70.

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Tungsten Carbide have extremely high hardness and wear-resistivity compared with conventional steel materials, and it is expected that the Tungsten carbide can be applied widely to dies and molds in the near future. In order to develop an efficient machining method of Tungsten Carbide for the dies and molds, series of cutting experiments were carried out to turn the sintered Tungsten Carbide materials with CBN tool. The selected sintered Tungsten Carbide workpieces are those containing Tungsten Carbide grains with mean grain size of 5μm, and 15wt%, 20wt% and 22wt% of Cobalt binder. The sintered CBN tool selected contains super-fine grains of CBN with mean grain size of 1μm. The cutting speed was varied from 10m/min to 60m/min, and the tool wear and the surface roughness were measured. It is concluded that the tool wear is less when cutting the sintered Tungsten Carbide containing larger amount of Cobalt binder. The surface roughness of about 2μm in Rz is obtained.

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18

Novoselova, Inessa, Serhii Kuleshov, Anatoliy Omel’chuk, Valerii Bykov, and Olena Fesenko. "ELECTROREDUCTION OF DITUNGSTATE AND CARBONATE ANIONS IN CHLORIDE MELT." Ukrainian Chemistry Journal 87, no. 12 (January 21, 2022): 97–108. http://dx.doi.org/10.33609/2708-129x.87.12.2021.97-108.

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Electrocatalysis is one of the actively developing fields of application of tungsten carbides. For the synthesis of catalytically active carbides (materials with a large specific surface area, small particle size and structural defects) a large number of different technologies are being developed in the world. The method of high-temperature electrochemical synthesis is promising one. For its successful realization, it is necessary to study in detail the electrochemical behavior of each carbide component (tungsten and carbon) and the features of their partial and joint discharge. The aim of this paper is a voltammetric study of the partial and joint electroreduction of Na2W2O7 and Li2CO3 in molten NaCl–KCl electrolyte under CO2 pressure at a temperature of 750 °C. As a result of research, it was found that in the system Na,K|Cl–Na2W2O7–Li2CO3–CO2 joint reduction of tungsten carbide synthesis components occurs from lithium complexes of tungstate (LixWO4)2-x and carbonate- (LixCO3)2-x anions at potentials -1.65 – -1.8 V. Introduction of СО2 into the system (creation of its excess pressure in the cell) is necessary for the binding of oxide anions O2-, released during the discharge of anionic complexes, into a carbonate complex. The released oxide anion in the near-electrode layer inhibits the cathodic process. Also, a necessary condition for the sustainability production of tungsten monocarbide WC is the presence of free carbon, which is formed during the decomposition of CO2. Nanosized composites of tungsten carbides with free carbon WC/C (5 wt%) were obtained by potentiostatic electrolysis at a potential of -1.8 V as a cathode product. The properties of the obtained compounds were analyzed by XRD, SEM, BET, and Raman spectroscopy. Tungsten carbide has a particle size of ~ 10 nm and consists of hollow spherical structures. The synthesized composite is mesoporous material with a specific surface area of ~ 140 m2/g. The properties of the synthesized composite, namely: structural defects, the presence of free carbon, spherical morphology, nanometer size and high specific surface area, make it possible to use it as an effective electrocatalyst, for example, in the reaction of hydrogen evolution in acidic aqueous solutions.

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19

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 (June 1, 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 pulverized under 75μm and were composed of tungsten carbide and cobalt identified by the XRD (X-ray Diffraction). To produce the WC(Tungsten Carbide) powder directly from decomposed scraps, pulverized powders were reacted with hydrochloric acid to remove the cobalt binder. Also to produce the tungstic acid, pulverized powders were reacted with aqua regia to remove the cobalt binder and oxidize the tungsten carbide. Tungsten carbide and tungstic acid powders were identified by XRD and chemical composition analysis.

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20

Lee, Seokwon, Jung Hyun Kim, Young Park, and Wonseok Choi. "Analysis of the Properties of Tungsten Carbide Thin Films According to the Sputtering Radio Frequency Power." Science of Advanced Materials 12, no. 10 (October 1, 2020): 1568–71. http://dx.doi.org/10.1166/sam.2020.3794.

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In this study, we investigated characteristics of tungsten carbide thin film according to carbon and tungsten ratio. Tungsten carbide thin film was co-sputtered on silicon substrate and glass substrates using an RF magnetron sputtering system. To analyze the characteristics according to the composition ratio of the tungsten carbide thin film, the RF powers of carbon/tungsten target were divided into 100 W/100 W, 125 W/75 W, 150 W/50 W, and 175 W/25 W, respectively. Hall measurement and 4 points probes were used to measure electrical properties of the tungsten carbide thin films. Raman and field emission scanning electron microscope (FE-SEM) analysis were performed.

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Yin Bo, 殷博, 薛常喜 Xue Changxi, and 李闯 Li Chuang. "碳化钨合金磨削仿真与工艺优化方法." Infrared and Laser Engineering 52, no. 7 (2023): 20220898. http://dx.doi.org/10.3788/irla20220898.

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22

Ditsche, Adrian, and Thomas Seefeld. "Agglomerated Tungsten Carbide: A New Approach for Tool Surface Reinforcement." Key Engineering Materials 809 (June 2019): 121–27. http://dx.doi.org/10.4028/www.scientific.net/kem.809.121.

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For the first time tungsten carbide particles were deliberately agglomerated by two-step laser melt injection. After a regular laser melt injection, a second laser melt injection was performed with additional tungsten carbide particles in order to generate a large local agglomerate. The influence of laser power, laser spot diameter, powder feeding rate and pulse time on the agglomeration process was examined and depended on the energy input and tungsten carbide quantity introduced into the metal matrix composite surface. Chemical composition of the agglomerates corresponded with the values of tungsten carbide and the agglomerate hardness was slightly lower. It is intended to apply this agglomerated tungsten carbide for deep drawing tools under Dry Metal Forming conditions.

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23

Idrees, Maria, Husnain Ahmad Chaudhary, Arslan Akbar, Abdeliazim Mustafa Mohamed, and Dina Fathi. "Effect of Silicon Carbide and Tungsten Carbide on Concrete Composite." Materials 15, no. 6 (March 10, 2022): 2061. http://dx.doi.org/10.3390/ma15062061.

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Flexural strength of concrete is an important property, especially for pavements. Concrete with higher flexural strength has fewer cracking and durability issues. Researchers use different materials, including fibers, polymers, and admixtures, to increase the flexural strength of concrete. Silicon carbide and tungsten carbide are some of the hardest materials on earth. In this research, the mechanical properties of carbide concrete composites were investigated. The silicon carbide and tungsten carbide at different percentages (1%, 2%, 3%, and 4%) by weight of cement along with hybrid silicon carbide and tungsten carbide (2% and 4%) were used to produce eleven mixes of concrete composites. The mechanical tests, including a compressive strength test and flexural strength test, along with the rapid chloride permeability test (RCPT), were conducted. It was concluded that mechanical properties were enhanced by increasing the percentages of both individual and hybrid carbides. The compressive strength was increased by 17% using 4% tungsten carbide, while flexural strength was increased by 39% at 4% tungsten carbide. The significant effect of carbides on flexural strength was also corroborated by ANOVA analysis. The improvement in flexural strength makes both carbides desirable for use in concrete pavement. Additionally, the permeability, the leading cause of durability issues, was reduced considerably by using tungsten carbide. It was concluded that both carbides provide promising results by enhancing the mechanical properties of concrete and are compatible with concrete to produce composites.

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Lu, Hao, Chong Zhao, Haibin Wang, Xuemei Liu, Rong Yu, and Xiaoyan Song. "Hardening tungsten carbide by alloying elements with high work function." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 6 (November 8, 2019): 994–1002. http://dx.doi.org/10.1107/s2052520619012277.

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There is intensive searching for superhard materials in both theoretical and experimental studies. Refractory and transition metal carbides are typical materials with high hardness. In this study, first-principles calculations were performed first to analyze the electronic structures and mechanical properties of the tungsten-carbide-based compounds. The results indicated that tungsten carbide could be hardened by alloying elements with high work functions to tailor the Fermi level and electron density. Guided by the calculations, a new type of tungsten carbide alloyed with Re was synthesized. The Young's modulus and hardness of the Re-alloyed tungsten carbide are increased by 31% and 44%, respectively, as compared with those of tungsten carbide. This study provides a new methodology to design superhard materials on a feasible electronic base using work function as a simple guiding parameter.

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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 (December 19, 2013): 53–60. http://dx.doi.org/10.1179/1743285513y.0000000049.

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26

Lourenço, Nuno, Henrique Santos, and Carlos Sá. "The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron." Materials Science Forum 587-588 (June 2008): 118–22. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.118.

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A tungsten carbide insert is produced during ductile iron foundry practice to increase the surface hardness of the material. The insert is ensured with the help of a critical quantity of a binder, around 3 weight percent of sodium silicate, previously mixed with the tungsten carbide powder. The binder is verified to form a film around the tungsten carbide particles and bridges amongst these enveloped particles; these films and bridges are replaced by the ductile iron melt during the molding cavity filling. After solidification, a sound inserted layer is formed, composed of tungsten carbide particles in a tungsten enriched cast iron matrix. In the absence of the binder addition to the tungsten carbide powder no inserted layer is produced. The surface hardness of the inserted test pieces is close to 500VHN/4.9N and the respective thickness is around 2.5 mm. The characterization of the effect of the sodium silicate in the mixture has been the main purpose of this work

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Yang, Hai, Ren Bao Jiao, and Shu Yang Wang. "Wear Resistance of Ion Implanting Tungsten Carbide on 65Mn Steel Used as Harrow Disk." Advanced Materials Research 1030-1032 (September 2014): 259–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.259.

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To improve the harrow disk made of 65Mn steel working life, an ion implanting metal in order to obtain tungsten carbide treatment was proposed in this work. Microstructure and phase composition of 65Mn steel obtained by ion implanting tungsten carbide process were analyzed by optical microscope and XRD, respectively. The surface hardness was tested by microscopic hardness tester, and the wear resistant performance of the wear layer was tested by abrader abrasor. The results showed that the micro-hardness of ion implanting tungsten carbide layer can be reached 1100 HV0.2, higher than that of 65Mn steel, the thickness of tungsten carbide layer was 400μm, which greatly improve the wear resistance. Harrow disk after the ion implanting tungsten carbide exhibited the excellent wear resistance in the sandy soil, and its working life was more than twice the length of the genera treatment harrow disk.

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Pavlenko, V., V. Kashibadze, D. Romanyuk, R. Sidel'nikov, and S. Domarev. "INVESTIGATION OF THE PARAMETERS OF ADSORPTION OF ETHYLHYDROSILOXANE ON THE SURFACE OF TUNGSTEN CARBIDE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 11 (July 26, 2022): 90–98. http://dx.doi.org/10.34031/2071-7318-2022-7-11-90-98.

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The article deals with the modification of the surface of tungsten carbide powder with ethylhydrosiloxane. The morphology and granulometric composition of the original tungsten carbide have been studied. To modify the powder, the oligomer is preliminarily dissolved in n-hexane. It is found that the adsorption equilibrium is established in the first hour. Based on the data obtained, an adsorption isotherm of oligomeric ethylhydrosiloxane molecules on tungsten carbide particles is plotted as a function of the equilibrium concentration. It has been established that the adsorption isotherm of oligomeric ethylhydrosiloxane molecules on tungsten carbide particles has a typical character of monomolecular (monolayer) adsorption. At an equilibrium concentration of 0.12 mg/cm3, the adsorption isotherm curve reaches a plateau. Data on the determination of the parameters of adsorption of oligomeric molecules of ethylhydrosiloxane on the surface of tungsten carbide are presented: the landing area occupied by one oligomer molecule and the thickness of the adsorption layer of the oligomer. It is shown that modification with ethylhydrosiloxane leads to a transition from a hydrophilic to a hydrophobic surface. To establish the hydrophobization of the surface of tungsten carbide after modification with ethylhydrosiloxane, authors determine the contact angles of surface wetting before and after modification. At oligomer concentrations above 0.12 mg/cm3, the contact angle of wetting the surface of tungsten carbide with water has a maximum value of 96±2°.

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Pu, Juan, Yu-Bo Sun, Lei Wu, Peng He, and Wei-Min Long. "Effect of CeO2 Content on Microstructure and Properties of Ni-Based Tungsten Carbide Layer by Plasma Arc Cladding." Coatings 12, no. 3 (March 6, 2022): 342. http://dx.doi.org/10.3390/coatings12030342.

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A Ce-containing Ni-based tungsten carbide layer was prepared on the surface of Q345 steel by plasma arc cladding technology. The effect of CeO2 additions on the microstructure and properties of the Ni-based tungsten carbide cladding layer was investigated. The results showed that the Ni-based tungsten carbide cladding layer had no pores and cracks and that their microstructural composition remained unchanged with CeO2 in the powder. After adding CeO2 into the powder, Ce atoms were absorbed on the surface of tungsten carbide particles to promote their dissolution and spheroidization. The preferentially formed high-melting-point Ce2O3 acted as a nucleating agent to induce the formation and dispersion of carbides. The shape of carbide particles changed from an irregular shape to a spherical shape. When the content of CeO2 was less than 0.2 wt.%, with the increase of CeO2 additions, the microstructure was refined. Meanwhile, the hardness and wear resistance of Ni-based tungsten carbide cladding layer increased. When the content of CeO2 was 0.2 wt.%, the refinement effect of CeO2 on the microstructure reached an optimum value, and the hardness value reached the maximum of 1139 HV10. Moreover the wear resistance was the best. This was attributed to the dispersion strengthening of undissolved tungsten carbide particles, the solid solution strengthening of Ni-based solid solution, and the precipitation strengthening of carbides. However, as the content of CeO2 exceeded 0.2 wt.%, excessive CeO2 increased the viscosity of the solution, resulting in component segregation. Thus, the refinement and spheroidization action of CeO2 weakened, and irregular-shaped carbides appeared again. The hardness and wear resistance of the Ni-based tungsten carbide cladding layer obviously decreased. Ce-containing Ni-based tungsten carbide layer can be widely used in deep-sea mining and other fields due to its high hardness and wear resistance.

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Suwa, Haruhiko, Soushi Sakamoto, Masafumi Nagata, Kazuhiro Tezuka, and Tetsuo Samukawa. "Applicability of Diamond-Coated Tools for Ball End Milling of Sintered Tungsten Carbide." International Journal of Automation Technology 14, no. 1 (January 5, 2020): 18–25. http://dx.doi.org/10.20965/ijat.2020.p0018.

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Sintered tungsten carbide which has high hardness and high heat resistance, has been widely used in molds and dies. Research on the development of a cutting technology for sintered tungsten carbide (sintered WC-Co alloy) has been pursued mainly with the use of a turning process. We focused on building an efficient milling method for sintered tungsten carbide by using diamond-coated ball end tools, and have investigated their basic properties under specific cutting conditions. This study extends our previous work by enhancing cutting distance in the milling of sintered tungsten carbide, especially that with a “fine” WC grain. The surface roughness of cut workpieces is evaluated from the point of view of the quality of surface roughness. A series of cutting experiments under different cutting conditions were carried out, and the possibility of deriving a suitable cutting condition for the ball end milling of sintered tungsten carbide is discussed.

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Yui, Akinori, Takayuki Kitajima, and Kenichiro Yoshitomi. "Face Turning of Cobalt-Free Tungsten Carbide Using Nano-Polycrystalline Diamond Tool." Advanced Materials Research 1136 (January 2016): 245–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.245.

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The use of hard and brittle materials for manufacturing optical parts, such as dies and molds are required in order to extend mold life. Although, cobalt-free tungsten carbide is one of the hardest materials, micro-cutting is very difficult due to its hardness and its brittleness. This paper investigates face turning of cobalt-free tungsten carbide using a nanopolycrystalline diamond [NPD] tool and Zinc dialkyldithiophosphate (ZnDTP) fluid. Surface roughness of the cobalt-free tungsten carbide achieved was 22nmRz, which is far larger than the theoretical value. That is, traditional cutting theory does not directly apply for face turning of cobalt-free tungsten carbide using NPD tool and ZnDTP fluid.

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Shan, Quan, Zu Lai Li, Ye Hua Jiang, Rong Zhou, and Yu Dong Sui. "Decomposition of Two Phase WC and W₂C in Casting Tungsten Carbide Particles in Steel/Iron Substrate Composites." Applied Mechanics and Materials 109 (October 2011): 120–24. http://dx.doi.org/10.4028/www.scientific.net/amm.109.120.

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The interface between matrix and casting tungsten carbide particle is produced by the the particles’ decomposition. Casting tungsten carbide particle is a kind of eutectic product，which is composed of two phases: WC and W2C. The two phases have differing chemical and physical properties, and thus follow different paths to achieve their decomposition process. By observing the decomposition of the particle, a hypothesis was put forward about how the casting tungsten carbide particle decomposes in steel/iron composites. An experiment was then designed to prove this hypothesis. The experimental result shows that heat gain plays a significant role in the decomposition process of casting tungsten carbide particles.

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Shizuka, Hiroo, Koichi Okuda, Masayuki Nunobiki, and Yoshihiro Yokoyama. "3313 Study on Micro Cutting of Tungsten Carbide by Diamond Tool." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2011.6 (2011): _3313–1_—_3313–4_. http://dx.doi.org/10.1299/jsmelem.2011.6._3313-1_.

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Adamczuk, Krzysztof, Daniel Dębowski, Szymon Wojciechowski, Dražan Kozak, and Miłosz Zabłocki. "The impact of additives applied to the lubricant on the burnishing process and tribological properties." International Journal of Applied Mechanics and Engineering 28, no. 2 (June 28, 2023): 13–23. http://dx.doi.org/10.59441/ijame/168937.

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The aim of this study was to determine the impact of additions of tungsten carbide and silicon carbide microparticles to the lubricant used in the burnishing process on the tribological properties of friction pairs. The cylinders made of AISI 1045 steel constituted a workpiece. Burnishing was made with a lubricant the SN150 base oil with addition of tungsten carbide and silicon carbide microparticles. The tested materials were burnished with forces of 1000 N and 1500 N. Before and after the burnishing process, the surface roughness and hardness of the tested materials were measured. The study also presents the results of tribological properties of friction pairs with the tested structural materials. It was found that the addition of tungsten carbide microparticles to the base oil in the burnishing process can result in improved surface quality and reduced surface roughness. The results also confirmed the effect of addition of tungsten carbide and silicon carbide to the lubricant used in the burnishing process on tribological properties.

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Rajiv, Sharma Kumar. "Parametric optimization of process parameters for Electric discharge Machining of Tungsten carbide (93% WC and 7%Co)." Production Engineering Archives 26, no. 4 (December 1, 2020): 154–61. http://dx.doi.org/10.30657/pea.2020.26.28.

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Abstract Nowadays there is a huge demand of High Strength Temperature Resistance (HSTR) alloys such as titanium, carbide, nimonics and ceramics in aerospace, defence and electronics. Among these alloys machining of tungsten carbide alloy is of interest, because of its numerous applications. Complex shapes of tungsten carbide are not generally made by traditional manufacturing process. To machine tungsten carbide with high accuracy, non-traditional machining process like Laser beam machining, Electron beam machining and Electrical discharge machining are a proper choice. In the present paper, the authors have machined Tungsten carbide (93% WC and 7%Co) with copper electrode. The machining is performed on EDM MODEL 500 X 300 ENC with VELVEX EDMVEL-2 as dielectric oil. The 17 experiments are carried out based on RSM (Box-Behnken) method. Further, in order to find the optimum combination grey relational approach is used. The results showed that pulse-on-time of 40μs, pulse-off-time of 2μs and current of 8A are optimum combination for machining of Tungsten carbide (93% WC and 7%Co). Lastly, the confirmation experiment has been conducted.

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Rajiv, Sharma Kumar. "Parametric optimization of process parameters for Electric discharge Machining of Tungsten carbide (93% WC and 7%Co)." Production Engineering Archives 26, no. 4 (December 1, 2020): 154–61. http://dx.doi.org/10.30657/pea.2020.26.28.

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AbstractNowadays there is a huge demand of High Strength Temperature Resistance (HSTR) alloys such as titanium, carbide, nimonics and ceramics in aerospace, defence and electronics. Among these alloys machining of tungsten carbide alloy is of interest, because of its numerous applications. Complex shapes of tungsten carbide are not generally made by traditional manufacturing process. To machine tungsten carbide with high accuracy, non-traditional machining process like Laser beam machining, Electron beam machining and Electrical discharge machining are a proper choice. In the present paper, the authors have machined Tungsten carbide (93% WC and 7%Co) with copper electrode. The machining is performed on EDM MODEL 500 X 300 ENC with VELVEX EDMVEL-2 as dielectric oil. The 17 experiments are carried out based on RSM (Box-Behnken) method. Further, in order to find the optimum combination grey relational approach is used. The results showed that pulse-on-time of 40μs, pulse-off-time of 2μs and current of 8A are optimum combination for machining of Tungsten carbide (93% WC and 7%Co). Lastly, the confirmation experiment has been conducted.

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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 (June 1, 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 trioxide particle was recovered by hydrometallurgical method. Recovered tungsten trioxide was reduced to tungsten particle in a hydrogen environment. After that, tungsten particle was melted and solidified to make a spherical one by RF (Ratio Frequency) thermal plasma process. Well spherical tungsten micro-particle was successfully obtained from spent scrap. In addition to the morphological change, thermal plasma process showed an advantage for the purification of feedstock particle.

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Zhang, Jian Guo, Norikazu Suzuki, Takashi Kato, Rei Hino, and Eiji Shamoto. "Influence of Material Composition on Ductile Machining of Tungsten Carbide in Elliptical Vibration Cutting." Key Engineering Materials 523-524 (November 2012): 113–18. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.113.

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Tungsten carbide is a crucial material for glass molding in optical industry. The present study investigated a feasibility of ductile machining of sintered tungsten carbide for glass molding by applying ultrasonic elliptical vibration cutting technology with single crystal diamond tool. Grain size and binder material of sintered tungsten carbide have an influence on hardness and/or toughness of the material. Binder material also has a chemical affinity to diamond. In order to examine the influence of material composition on ductile machining of tungsten carbide, a series of grooving and planing experiments were conducted to several different tungsten carbide workpieces with the different binder phase and the different grain size. The experimental results indicated that micro grooving in a ductile mode can be attained successfully by applying ultrasonic elliptical vibration cutting, while finished surface deteriorates with brittle fractures in ordinary cutting. It was also clarified that grain size and binder material have significant influence on the deteriorations in the surface quality, the tool shape and the cutting forces.

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Lee, Kwang-jin, and DaeHan Kim. "Effect of Tungsten Carbide Morphology, Quantity, and Microstructure on Wear of a Hardfacing Layer Manufactured by Plasma Transferred Arc Welding." Metals 11, no. 12 (December 15, 2021): 2035. http://dx.doi.org/10.3390/met11122035.

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Hardfacing layers on mild steel substrates were successfully manufactured using a plasma transferred arc welding (PTAW) process to combine tungsten carbide powder and binder metal. Three morphological types of tungsten carbide powder were employed: spherical, fused angular, and mixed powder. The effects of both the morphology and the quantity of tungsten carbide powder on the wear property of the products were determined using a dry sand wheel abrasion test. The results revealed that two conditions effectively increased the wear resistance of the hardfacing layers: the use of spherical tungsten carbide and the use of an increased quantity of tungsten carbide. Moreover, the formation of an interfacial layer of intermetallic compounds (IMCs) between the tungsten carbide and binder metal, and the relationship between the microstructure of the IMC layer and its wear property were also investigated. It was confirmed that, in general, preferential wear occurs in the binder metal region. It was also unveiled that the wear property improves when interfacial IMC bands are formed and grown to appropriate width. To obtain a sound layer more resistant to wear, the PTAW conditions should be adequately controlled. In particular, these include the process peak temperature and the cooling rate, which affect the formation of the microstructure.

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Jenuš, P., A. Abram, S. Novak, M. Kelemen, M. Pečovnik, T. Schwarz-Selinger, and S. Markelj. "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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Jia, Xiao Ming, Yue Xing Song, Xiao Xin Chen, and Xiu Ling Zhang. "Study on Tungsten Carbide Leaching of Cemented Carbide Tool in Sodium Carbonate Solution." Advanced Materials Research 287-290 (July 2011): 1873–76. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1873.

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In the cutting progress, the cutting temperature and the friction will be reduced when the water-based cutting fluid is used, but some elements in the cutting fluid will result in the leaching of tungsten carbide in cemented carbide tool. The influence rule of sodium carbonate on the tungsten carbide leaching of cemented carbide under the condition of different temperatures and different concentrations is investigated by soaking experiments, SEM analysis, energy spectrum analysis and electrochemical detection experiments. The experimental results reveal that the influence of sodium carbonate on the tungsten carbide leaching are great, and the leaching rate will increase with the increasing of temperature and concentration.

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Parihar, Rityuj Singh, Srinivasu Gangi Setti, and Raj Kumar Sahu. "Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering." Journal of Composite Materials 52, no. 10 (August 9, 2017): 1363–77. http://dx.doi.org/10.1177/0021998317724217.

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Functionally graded cemented tungsten carbide belongs to a hybrid Functionally Graded Materials family. However synthesis of functionally graded cemented tungsten carbide is a great challenge due to possibility of “Co migration” and CaF2 vaporization during liquid phase sintering. Hence the present work deals with the development of nanocrystalline materials using ball milling and consolidation of milled material by Spark Plasma Sintering (SPS) for the preparation of functionally graded cemented tungsten carbide. The effects of ball milling and contents of Co, CaF2 and WC on WC/Co/CaF2 powder mixture were analyzed. Grain morphology, particle size, micro-strain, crystallite size, etc. of milled samples were investigated using scanning electron microscopy and X-Ray diffraction techniques. In addition to that, density, microstructure, hardness, fracture toughness and residual stress of consolidated sample are also reported. These tests confirm the formation of nanocrystalline particles and sub-sequent consolidation of functionally graded cemented tungsten carbide with solid lubricant. Hence ball milling with SPS is a prominent and viable process combination for the preparation of functionally graded cemented tungsten carbide.

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Stanciu, Victor Ioan, Véronique Vitry, and Fabienne Delaunois. "Direct Carburization of Tungsten Trioxide by Mechanical Alloying." Advanced Materials Research 1128 (October 2015): 51–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1128.51.

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Tungsten carbide is the choice of predilection for producing parts requiring good wear resistance. In this context it is produced in large quantities by the carburization of tungsten trioxide under a stream of hydrogen at elevated temperature followed by grinding to achieve the required fineness. This work aims to study the conditions in which tungsten carbide can be produced by mechanical alloying method. Using this method would facilitate obtaining carbide through a simple and easy to use technology without prohibitive costs, directly by an end user. For this purpose the thermodynamic study is conducted to establish the conditions under which the carburizing reaction can take place. The condition for the reaction to occur spontaneously is reaching a temperature of 621°C. Carrying out this reaction in a system without external energy input seems impossible. Mechanical alloying experiments were carried out in a Fritch Pulverisette 7 premium line planetary mill, equipped with two bowls of 80ml capacity lined with sintered tungsten carbide. Each bowl contained 200 g of tungsten carbide balls with dimensions of 10 mm and 12 mm. The balls/load ratio was 10:1. Grinding was performed in steps of 3 hours, with breaks for sampling, with rotation speeds of 600 and 800 rpm. Tests conducted showed complete conversion of raw materials into tungsten carbide after different durations of time.

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Gorucu–Coskuner, Hande, Ezgi Atik, and Tulin Taner. "Tooth color change due to different etching and debonding procedures." Angle Orthodontist 88, no. 6 (August 3, 2018): 779–84. http://dx.doi.org/10.2319/122017-872.1.

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ABSTRACT Objectives: To compare the effects of different etching techniques, 12–, 24–bladed tungsten carbide burs, and polishing discs on tooth color changes during orthodontic treatment. Materials and Methods: 59 individuals (mean age: 15.20 ± 1.59 years) were divided into four groups: 37% phosphoric acid and adhesive primer was used in Groups I and II whereas self–etch primer was used in Groups III and IV for enamel preparation. After orthodontic treatment, residual adhesives were cleaned with 12–bladed tungsten carbide burs in Groups I and III, while 24–bladed tungsten carbide burs were used in Groups II and IV. All teeth were polished with medium and fine Sof–Lex XT discs (3M ESPE, St Paul, Minnesota). Color measurements were taken from upper incisors and canines at pretreatment (T0), after cleaning with tungsten carbide burs (T1) and polishing with discs (T2). Wilcoxon test was used for evaluation of L*, a*, b* changes and Kruskal–Wallis for intergroup comparison of color changes. Results: L*, a*, b* values, except a* at Groups I, II, IV, and b* at Group III, changed significantly (P < .05). Groups III and IV showed significantly different color alterations from T0 to T1 (P < .05). After polishing, tooth color alterations were not significantly different among the groups. Conclusions: In self–etch bonding groups, a 12–bladed tungsten carbide bur caused less color change than the 24–bladed tungsten carbide bur. Orthodontic treatment resulted with visible and clinically unacceptable tooth color alterations regardless of the enamel preparation and clean–up techniques. Polishing reduced the effect of tungsten carbide burs, but did not affect the total influence of orthodontic treatment on the tooth color.

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Lan, Leilei, Xingce Fan, Yimeng Gao, Guoqun Li, Qi Hao, and Teng Qiu. "Plasmonic metal carbide SERS chips." Journal of Materials Chemistry C 8, no. 41 (2020): 14523–30. http://dx.doi.org/10.1039/d0tc03512b.

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López Baltazar, Enrique Alejandro, Haideé Ruiz Luna, Alejandro López Ibarra, Francisco Alvarado Hernández, and Víctor Hugo Baltazar Hernández. "Study of the wear resistance due to sliding of tungsten carbide coatings." BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS 17, no. 3 (November 22, 2019): 90. http://dx.doi.org/10.24054/01204211.v3.n3.2019.3569.

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En el presente trabajo se realizaron recubrimientos superficiales de carburo de tungsteno sobre un substrato de acero del tipo AISI 1018 mediante el proceso de rociado térmico utilizando tres diferentes tipos de flama: carburante, neutra y oxidante. Los resultados indican que los valores de porosidad son menores bajo condición de flama carburante con una microestructura compuesta de partículas semi-fundidas y sin fundir, de estructura no laminar, y con presencia de líneas de óxidos. La dureza medida en el recubrimiento de condición carburante resultó por encima de los 1000Hv debido a la presencia de partículas duras de WC y de W2C. Así mismo, los recubrimientos realizados bajo condición de flama carburante resultaron en una resistencia al desgaste bastante aceptable de acuerdo al análisis realizado bajo diferentes condiciones de carga y tiempo de deslizamiento. Finalmente se concluye que las partículas presentes de carburo de tungsteno y la dureza relativamente de éstas influyeron en la resistencia al desgaste de estos recubrimientos a pesar de la porosidad aparente observada. Palabras clave: Carburo de tungsteno, desgaste por deslizamiento, porosidad, rociado térmico.

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Erzar, Benjamin, and Jean-Luc Zinszner. "Dynamic characterization of tungsten carbide behaviour at very high strain-rates." EPJ Web of Conferences 183 (2018): 02061. http://dx.doi.org/10.1051/epjconf/201818302061.

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Cemented tungsten carbide, with its very high density and high strength, is known to be the material composing several small calibre armour piercing ammunitions. The impact of a tungsten carbide core projectile onto a high efficiency armour often leads to the fracture of the tungsten carbide core. Thus, the pertinence of material models used in numerical simulations to describe the behaviour and the damage of the target is not sufficient to well predict a ballistic impact. In this work, the GEPI high-pulsed power generator is used to conduct dynamic characterization of the behaviour of a cemented tungsten carbide under both compressive and tensile loadings. The Hugoniot Elastic Limit of this material has been identified (HEL = 5.8 GPa). Moreover, Lagrangian analysis allowed the complete loading path to be identified up to 18 GPa.

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Kuzmichev, E. N., S. V. Nikolenko, and P. G. Chigrin. "Preparation of Tungsten Based Metal-Ceramic Alloys by the Plasma Chemical Synthesis from the Mineral Concentrate Mined in the Far Eastern Region." Materials Science Forum 992 (May 2020): 809–13. http://dx.doi.org/10.4028/www.scientific.net/msf.992.809.

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s The paper considers the development of an alternative method for obtaining functional materials based on tungsten carbide and its compounds using simple and sufficiently productive equipment. This method will allow using mineral dumps as a raw material base, in addition, it gives an opportunity to obtain new compounds based on tungsten. Obtained during plasma-chemical synthesis, the WxCW alloy from a mixture based on a tungsten-containing concentrate has a two-phase composition consisting of carbides of the WxCW group and metallic tungsten. According to preliminary calculations, the content of the carbide phase in the alloy is 88% and depends on the plasma synthesis processes, on the concentrate composition, and on the introduced carburetor volume. The synthesis was carried out using tungsten-containing concentrates by treatment of high-density energies (g> 104 - 105 W/cm2) in an inert gas medium. The stage of plasma-chemical synthesis of the WxCW semi-finished product made it possible to obtain nanosized tungsten carbide crystals. This makes a possibility to synthesize a high-quality alloy with an ordered structure of the carbide phase during refinement and pressing. The carbide phase ordered structure contributed to an increase in the strength characteristics of the new refractory material.

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Liu, Zhiwei, Ping Li, Fuqiang Zhai, Qi Wan, Alex A. Volinsky, and Xuanhui Qu. "Amorphous carbon modified nano-sized tungsten carbide as a gas diffusion electrode catalyst for the oxygen reduction reaction." RSC Advances 5, no. 87 (2015): 70743–48. http://dx.doi.org/10.1039/c5ra15394h.

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Nanostructured tungsten carbide is used as the catalyst in a gas diffusion electrode. The presence of the appropriate amorphous carbon is beneficial for improving the conductivity and dispersibility of the tungsten carbide catalyst.

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Ma, Ning, Zhen Xiong Cheng, Huan Tao Wu, and Fu Xing Ye. "Influence of Powder Structure on Decarburization and Microstructure of HVOF Sprayed WC-12wt.%Co Coatings." Advanced Materials Research 834-836 (October 2013): 609–12. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.609.

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In order to examine the influences of tungsten carbide particle size on decarburization behavior and microstructure of HVOF sprayed WC-Co coating, four kinds of agglomerated WC-12wt.%Co powders were deposited on mild steel substrates by using a high velocity oxy-fuel (HVOF) spray system. The phase compositions and microstructure of the feedstock powders and sprayed coatings were investigated by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The results showed that the decarburization became more serious with the decreasing of tungsten carbide particle size in the starting powder. W phase was detected in the as-sprayed nanocomposite WC-12wt.%Co coating. All the coatings showed very compact microstructure with the hard phases embedded in Co matrix. The microstructure of HVOF sprayed WC-12wt.%Co coatings depended on the feedstock powder structure. The shape of tungsten carbide particles was rounder and the volume fraction of carbide phase decreased in coatings as the tungsten carbide particle size decreased.

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Journal articles on the topic 'Carbure de tungstène'

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