Gotowe bibliografie tematyczne / Carbide–cobalt

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Gotowa bibliografia na temat „Carbide–cobalt”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 16 lutego 2022

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Artykuły w czasopismach na temat "Carbide–cobalt"

Jia, Xiao Ming, i Fei Wang. "Influence of Antirusting Aggent on the Cobalt Leaching of the Cemented Carbide Tool". Key Engineering Materials 407-408 (luty 2009): 317–20. http://dx.doi.org/10.4028/www.scientific.net/kem.407-408.317.

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The cutting fluid is widely used in cutting process with the cemented carbide tool. This paper studied the influence of some antirusting aggents, such as triethanolamine, tri-sodium phosphate, benzotriazole, sodium carbonate anhydrous, on the cobalt leaching of the cemented carbide tool by soaking test. The test results showed that a cobalt on cememted carbide surface and triethanolamine can produce complex compound into solution that made the cobalt leaching. The cobalt of the cemented carbide with the ion of the tri-Sodium phosphate in a water solution can form the loose deposition which leaded to the cobalt leaching.The benzotriazole and the cobalt can generate complex compound film covering on cemented carbide to effective inhibits the cobalt leaching. The inhibitive effect about the cobalt leaching of the sodium carbonate anhydrous is carried out through cathode reaction. The cobalt leaching of cemented carbide tool is effective inhibited by adding the benzotriazole and the carbonate anhydrous in the water-based cutting fluid.

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Zhang, Hao Qiang, Xiao Ming Jia i Fei Wang. "Study of Inhibition Function of Grinding Fluid Additive to Leaching Cobalt from Cemented Carbide". Key Engineering Materials 416 (wrzesień 2009): 381–85. http://dx.doi.org/10.4028/www.scientific.net/kem.416.381.

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Grinding fluid is the essential supplementary material in cemented carbide grinding process. The amine-base additive can make cobalt leach from cemented carbide. Through grinding test, this paper mainly studies the influence of TEA-containing solution on cobalt leaching from cemented carbide and the leaching mechanism by SEM and AES, and then identifies the effective inhibitor. The results are as follows: (1) TEA additive can make cobalt leach from cemented carbide. (2) Additive of triethanolamine oleate in the solution can obviously inhibit the leaching of cobalt from cemented carbide. (3) Additive of benzotriazole in the solution can obviously inhibit the leaching of cobalt from cemented carbide. (4)The mixture of triethanolamine oleate, borax and benzotriazole has the best inhibition function. So it can conclude: The mixture of triethanolamine oleate, borax and benzotriazole can obviously reduce the leaching of cobalt from the cemented carbide, and reduce the danger of the fluid to human body.

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Yui, Akinori, Takayuki Kitajima i Kenichiro Yoshitomi. "Face Turning of Cobalt-Free Tungsten Carbide Using Nano-Polycrystalline Diamond Tool". Advanced Materials Research 1136 (styczeń 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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Pee, J. H., G. H. Kim, H. Y. Lee i Y. J. Kim. "Extraction Factor Of Tungsten Sources From Tungsten Scraps By Zinc Decomposition Process". Archives of Metallurgy and Materials 60, nr 2 (1.06.2015): 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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Antonini, J., K. Starks, L. Millecchia, J. Roberts i K. Rao. "Changes in F-actin Organization Induced by Hard Metal Particle Exposure in Rat Pulmonary Epithelial Cells as Observed by Laser Scanning Confocal Microscopy". Microscopy and Microanalysis 5, S2 (sierpień 1999): 492–93. http://dx.doi.org/10.1017/s1431927600015786.

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Hard metal is an alloy of tungsten carbide and cobalt along with other components such as chromium carbide, molybdenum carbide, tantalum carbide, and nickel. Chronic exposure to hard metal particles by inhalation causes alveolitis leading to interstitial fibrosis, the pathogenesis of which is still undefined. The initial inflammatory response includes a change in epithelial cell permeability barrier function (1) which has been shown to be regulated by the state of assembly and organization of the actin cytoskeletal network (2, 3). Therefore, the objective of this study was to evaluate the effect hard metal particles have on F-actin organization of rat lung epithelial cells in an in vitro culture system.Rat lung epithelial cells (L2: ATCC, CCL-149) were grown to confluence on glass coverslips and exposed to various concentrations of hard metal particles for 24 hours. The effect on F-actin organization was visualized by confocal microscopy following Bodipy-Phallacidin staining, while changes in cell morphology were assessed by phase contrast microscopy. Hard metal particles of cobalt, tungsten carbide, and tungsten carbide/cobalt (6 % cobalt) were tested at concentrations of 1, 3, and 5 μg/ml. There was a dose-dependent change in the F-actin organization in the cells. The actin microfilaments lost their uniform distribution and aggregated into homogeneous masses of F-actin staining. Significant change in F-actin state was observed even at a 1 μg/ml concentration of tungsten carbide/cobalt particles. This is consistent with previous observations that pathological effects of tungsten carbide/cobalt particles are more pronounced compared to either metal alone. Phase contrast microscopy revealed no significant change in the cell morphology at this short incubation time.

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Zhang, Xiu Ling, Xiao Ming Jia i Jian Xiao Lian. "Study on the Mechanism of the Cobalt Leaching of Cemented Carbide in Triethanolamine Solution". Advanced Materials Research 97-101 (marzec 2010): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1203.

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The reactionary trend of the triethanolamine and cobalt in cemented carbide and the mechanism of cobalt leaching have been investigated by soaking experiments, friction experiments and electrochemical gaging experiments. The experimental results reveal that triethanolamine is prone to form coordination compound with cobalt ion .The amount of cobalt’s element leaching from cemented carbide is added up with the increase of time and triethanolamine concentration. So when using cemented carbide cutting tool, the water-based cutting fluid containing triethanolamine addictive should be avoided.

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Zhang, Hao Qiang, Xiao Ming Jia, Y. Gao i Suo Xia Hou. "Study of Inhibition to Leaching of Cobalt from Cemented Carbide Tools". Key Engineering Materials 315-316 (lipiec 2006): 546–50. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.546.

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Cutting fluid is the essential material in metal cutting process. This paper mainly studies the influence of TEA-containing solution on cobalt leaching from cemented carbide tools and the leaching mechanism, and then identifies the effective inhibitor. The results are as follows: (1) TEA additive can make cobalt leach from cemented carbide tools. (2) Addictive of triethanolamine oleate in the solution can obviously inhibit the leaching of cobalt from cemented carbide tools and there exists the best proportion. (3) The mixture of triethanolamine oleate and borax has the best inhibition function. So it can conclude: The mixture of triethanolamine oleate and borax can obviously reduce the leaching of cobalt from the cemented carbide tools, which improves the working life of the cutter and reduces the danger of the fluid to human body.

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Bagnall, C., J. Capo i W. J. Moorhead. "Oxidation Behavior of Tungsten Carbide-6% Cobalt Cemented Carbide". Metallography, Microstructure, and Analysis 7, nr 6 (15.11.2018): 661–79. http://dx.doi.org/10.1007/s13632-018-0493-7.

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Zhu, Xinyang, Xueping Zhang, Liang Huang, Yongqin Liu, He Zhang i Shaojun Dong. "Cobalt doped β-molybdenum carbide nanoparticles encapsulated within nitrogen-doped carbon for oxygen evolution". Chemical Communications 55, nr 67 (2019): 9995–98. http://dx.doi.org/10.1039/c9cc04892h.

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Herein, we report a novel cobalt doped transitional metal carbide based OER electrocatalyst, cobalt doped β-molybdenum carbide encapsulated by nitrogen doped carbon framework, which shows an overpotential of 262.2 mV at current density of 10 mA cm⁻².

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Cheng, Jian Bing, Si Qin Pang, Xi Bin Wang i Qi Xun Yu. "Effect of Grain Refinement and Composition on the Wear of Cemented Carbide Cutting Tools". Applied Mechanics and Materials 456 (październik 2013): 507–11. http://dx.doi.org/10.4028/www.scientific.net/amm.456.507.

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Tool life tests of continuous cutting superalloy GH2132 were carried out by WC/Co cemented carbide cutting inserts of different grain size and cobalt content, and flank surface wear morphology of the cutting inserts were observed by ZEISS continuous zoom stereo microscope and microphotograph system. The results show that grain size and cobalt content strongly influence the cutting tool life and tool wear, grain refinement and proper cobalt content are help to improve the tool life and the wear resistance of WC/Co cemented carbide. The wear mechanisms of different grain size and cobalt content of ultrafine cemented carbide tools were adhesion and notch, among them, adhesive was the main wear mechanism at higher cutting speeds.

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Rozprawy doktorskie na temat "Carbide–cobalt"

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

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
Includes bibliographical references (p. 69-70).
Three Dimensional Printing is an additive manufacturing process for rapid prototyping ceramic and metallic parts [Sachs, et al, 1990]. Green (not sintered) tungsten carbide-cobalt parts must have a density greater than 50% of the theoretical density, 14.9 g/cc, for proper sintering and post-processing. Two approaches were assessed for feasibility and robustness: printing slurry into tungsten carbide-cobalt spray dried powder and printing a solvent in spray dried tungsten carbide powder that readily dissolves. For slurry administered to a powder bed of solid, spherical particles, it has been found that the resulting packing primitive packing fraction increases almost linearly with the volume loading of the slurry over a range of powder size. The increase in density is approximately half what would be calculated by assuming that the slurry fills all the porosity in the powder bed. The maximum green density achieved by printing slurry into a spray dried tungsten carbide-cobalt bed was 41%, midway between the lower bound calculated by assuming the vehicle in the slurry infiltrates only the large pores between the spray dried power and the upper bound calculated by assuming that the vehicle of the slurry also infiltrates the find pores within a spray dried granule. A re-dispersible spray dried powder (38-53 micron size range) was fabricated using only the Duramax 3007 dispersant as the binder. This powder redisperses in water. Administering a drop of water to this powder resulted in primitives with 47% packing density, but which had significant quantities of 80 micron voids.
(cont.) Several lines of evidence pointed to the hypothesis that the voids were the result of trapped air. Two methods were successfully employed to nearly eliminate such voids. In one approach, the droplet of water wvas administered to the powder bed under a vacuum of between 25 and 40 torr and air was admitted to the chamber to 1 atmosphere after different intervals of time ranging from 30 seconds to 10 minutes. In another approach, the ability of water to absorb CO₂ was used to "getter" any trapped gas into the liquid. Water was administered to a powder bed under a CO₂ environment at room temperature. After a 2 minute period, intended to allow the spray dried powder to substantially re-disperse, the temperture of the powder bed was lowered to 0-5 degrees Centigrade in order to increase the amount of CO₂ which could be absorbed in the water and "switch on" the gettering of the trapped gas.Controls were run with the same procedure in air. The primitives made under CO₂ were nearly void free and had densities as high as 52%, while the controls were not significantly different than primitives made at room temperature in air.
by Andrew Kelley, III.
S.M.

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Huba, Zachary. "Synthesis and characterization of cobalt carbide based nanomaterials". VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3320.

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Permanent magnets are used heavily for multiple applications in industry and current electronic technologies. However, the current permanent landscape is muddled by high cost of materials and insufficient magnetic or thermal properties. The primary focus of this dissertation work is the synthesis and optimization of a new permanent magnetic material, in the form of cobalt carbide nanomaterials. The optimization revolved around controlling the crystal phase and particle shape of synthesized cobalt carbide particles; these parameters have significant impact on the observed magnetic properties of magnetic nanoparticles. Co3C was identified to be the preferred crystal phase, leading to better magnetic properties. Cobalt Fumarate was found to be the ideal precursor to synthesize anisotropic Co3C particles and enhance magnetic properties of the synthesized cobalt carbide particles. Lastly, an ethanol based reduction system was employed to develop the greener synthesis of Co and Ni magnetic particles.

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Archer, M., RI McCrindle i ER Rohwer. "Analysis of cobalt, tantalum, titanium, vanadium and chromium in tungsten carbide by inductively coupled plasma-optical emission spectrometry". The Royal Society of Chemistry, 2003. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001953.

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Summary Inductively coupled plasma optical emission spectroscopy (ICP-OES) was used to measure the concentrations of cobalt, tantalum, titanium, vanadium and chromium in solutions of tungsten carbide. The main advantage of the method described here lies in the speed, convenience and effectiveness of the dissolution procedure. Aliquots of powdered tungsten carbide were dissolved in a solution of 5% aqua regia in 30% hydrogen peroxide. Complete dissolution was usually achieved within 10 min. The accuracy of the method was assessed by the analysis of certified reference materials, secondary reference materials and matrix spiking. The method was successfully applied to commercial type samples with differing compositions. Slightly more emphasis was placed on the measurement of vanadium, since no information on the measurement of this element in solutions of tungsten carbide, by ICP-OES, has been published. Investigation of the interference effects of the elements in the sample matrix on each other was essential for accurate results comparable to other published analytical methods.

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Crause, Chantelle. "Synthesis and application of carbene complexes with heteroaromatic substituents /". Access to E-Thesis, 2004. http://upetd.up.ac.za/thesis/available/etd-05252005-145146/.

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Oliveira, Mark A. (Mark Anthony) 1977. "Slurry based Three Dimensional Printing (S-3DP tm) of tungsten carbide cobalt". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/109638.

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Almugaiteeb, Turki I. "OPTIMIZING COBALT CARBIDE BASED NANOMATERIALS BY USING NUCLEATING AGENTS AND STATISTICAL ROUTES". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4310.

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The continuous high demand on permanent magnets in industries opened new research plateau to develop alternative magnetic material. The current used permanent magnet materials in the market still suffer from high cost and insufficient magnetic or thermal properties. The central focus of this dissertation work is the optimization of cobalt carbide based nanomaterial by means of modifying polyol synthesis assisted by nucleation agent and systematic statistics using JMP software tool. In most existing literatures, producing cobalt carbide (Co2C or Co3C) lack reproducibility and consistency resulting in nonsolid magnetic properties results. The practical requirements for cobalt carbide to be used as permanent magnet are high coercivity (Hc), high magnetization (Ms), resulting in a high-energy product (HcxMs). Previous literatures have shown coercivities of 1.5 to 2.5 kOe for cobalt carbides under aggressive temperatures conditions (300oC) or after aligning the particles under magnetic field. A statistical guided method performed a sequence of experiments toward producing high coercivities using surface response design. Primarily, the statistical study to optimize cobalt carbide was made by analyzing experimental condition to fulfill high magnetic properties with tuned conditions as much as possible. Therefore, having the advantage for superior control on process variable when shifting cobalt carbide for scale up production in flow chemistry set up using microreaction system (MMRS). The optimization is based upon selecting the most important conditions in polyol reaction to produce cobalt carbide (Co2C or Co3C) and feed JMP software model e.g. reaction temperature, reaction time, and or precursor concentration…etc. These factors called (effects) used to design experiments and generate tables to run minimum experiments. Points of each effect (levels) are selected based on previous knowledge and experience with the synthesis. The output called (response) can be any of the magnetic properties of our interest e.g. magnetization (Ms), coercivity (Hc), or energy magnetic product (HcxMs). In the first model fit of cobalt carbide magnetic was studied in a polyol reaction to increase its magnetic energy product and optimize the experimental conditions. The results disclosed increase in magnetic energy product (6.2 MGOe) when validating the prediction model conditions suggested by JMP: shorter reaction time, and lower precursor concentration conditions at maximum reaction temperature. Finally, to my knowledge studying the effect of the nucleating agent to alter cobalt carbide growth have not been studied so far. Therefore, statistical study design using central composite design (CCD) to investigate the nucleating agent effect of silver nitrite on cobalt carbide coercivity was made. The importance of nucleating agent on coercivity is vigorous to attain and control the growth direction of cobalt carbide nanoparticles. This is due to the shape anisotropy contribution to enhance coercivity unlike weak shape anisotropy attributed to agglomeration of nanoparticles demonstrated in previous studies. Enhancement of coercivity reached 3 kOe with aspect ratio control as a function of silver nitrite concentration under lower reaction temperature. The continuous high demand on permanent magnets in industries opened new research plateau to develop alternative magnetic material. The current used permanent magnet materials in the market still suffer from high cost and insufficient magnetic or thermal properties. The central focus of this dissertation work is the optimization of cobalt carbide based nanomaterial by means of modifying polyol synthesis assisted by nucleation agent and systematic statistics using JMP software tool. In most existing literatures, producing cobalt carbide (Co2C or Co3C) lack reproducibility and consistency resulting in nonsolid magnetic properties results. The practical requirements for cobalt carbide to be used as permanent magnet are high coercivity (Hc), high magnetization (Ms), resulting in a high-energy product (HcxMs). Previous literatures have shown coercivities of 1.5 to 2.5 kOe for cobalt carbides under aggressive temperatures conditions (300oC) or after aligning the particles under magnetic field. A statistical guided method performed a sequence of experiments toward producing high coercivities using surface response design. Primarily, the statistical study to optimize cobalt carbide was made by analyzing experimental condition to fulfill high magnetic properties with tuned conditions as much as possible. Therefore, having the advantage for superior control on process variable when shifting cobalt carbide for scale up production in flow chemistry set up using microreaction system (MMRS). The optimization is based upon selecting the most important conditions in polyol reaction to produce cobalt carbide (Co2C or Co3C) and feed JMP software model e.g. reaction temperature, reaction time, and or precursor concentration…etc. These factors called (effects) used to design experiments and generate tables to run minimum experiments. Points of each effect (levels) are selected based on previous knowledge and experience with the synthesis. The output called (response) can be any of the magnetic properties of our interest e.g. magnetization (Ms), coercivity (Hc), or energy magnetic product (HcxMs). In the first model fit of cobalt carbide magnetic was studied in a polyol reaction to increase its magnetic energy product and optimize the experimental conditions. The results disclosed increase in magnetic energy product (6.2 MGOe) when validating the prediction model conditions suggested by JMP: shorter reaction time, and lower precursor concentration conditions at maximum reaction temperature. Finally, to my knowledge studying the effect of the nucleating agent to alter cobalt carbide growth have not been studied so far. Therefore, statistical study design using central composite design (CCD) to investigate the nucleating agent effect of silver nitrite on cobalt carbide coercivity was made. The importance of nucleating agent on coercivity is vigorous to attain and control the growth direction of cobalt carbide nanoparticles. This is due to the shape anisotropy contribution to enhance coercivity unlike weak shape anisotropy attributed to agglomeration of nanoparticles demonstrated in previous studies. Enhancement of coercivity reached 3 kOe with aspect ratio control as a function of silver nitrite concentration under lower reaction temperature.

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Woolmore, Nicola J. "The failure of a tungsten carbide-cobalt cored projectile penetrating a hard target". Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/4657.

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Experimental results are presented from an investigation of the parameters of a ceramic-faced armour system that are required to induce damage in a tungsten carbide - cobalt (WC-Co) penetrator. A WC-Co material model has been successfully developed and implemented within the numerical hydrocode AUTODYN 2D. The understanding of penetration mechanisms was used to guide a parametric investigation, validating the WC-Co material failure model with experimental results. A series of experiments has been conducted firing the Russian 14.5 mm BS41 WC-Co cored projectile into various thicknesses and types of alumina (Al2O3) and silicon carbide (SiC), backed by aluminium alloy or mild steel semi-infinite witness blocks. Results demonstrated that SiC B out-performed standard monolithic armours and a selection of other armour ceramics including PS 5000 SiC and Sintox-CL. After comminution, the SiC B consisted of particles of closely interlocked grains. These appeared to provide considerable resistance to deviatoric stresses. Results suggest that it is not only increased hardness but also the nature of the fracture of the ceramic ahead of the penetrator that improves the armour’s ballistic performance at defeating WC-Co penetrators. If such superior ballistic response can be controlled and incorporated into practical armour systems, it will provide the basis for an advance in armour protective capability against WC-Co penetrators. In addition, a numerical material model derived from experimental data was developed to provide a preliminary tool to study the WC-Co failure. It was demonstrated that the numerical estimation of WC-Co behaviour using a shock Equation Of State (EOS), a piecewise linear strength model and a principle stress failure model provides a good method to estimate spall behaviour under dynamic loading in AUTODYN 2D. Successful numerical simulation of the material model used demonstrated the future potential of the technique.

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Woolmore, N. J. "The failure of a tungsten carbide-cobalt cored projectile penetrating a hard target". Thesis, Engineering Systems Department, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/4657.

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Liu, Yuefeng. "Silicon carbide and nano-carbons containing cobalt catalysts for the Fisher-Tropsch synthesis". Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAF024/document.

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La Synthèse Fischer-Tropsch (SFT) est une technologie clé pour transformer le gaz de synthèse (CO + 2H2) en hydrocarbures liquides, matières premières pour la chimie de base. Il s'avère que les catalyseurs à base de cobalt sont les plus performants et leur développement dans l'industrie impose au matériau support de posséder une conductivité thermique élevée et une structure ouverte. Dans ce travail, un nouveau support hiérarchisé constituée deα -Al2O3, recouvert homogènement de nanotubes de carbone, a été préparé pour supporter des catalyseurs au cobalt. Ces derniers montrent une très grande sélectivité en hydrocarbures liquides ainsi que de meilleures activités catalytiques. Les performances obtenus ont pu être améliorées en déposant une fine couche de TiO2 sur la surface des nanotubes de carbone, améliorant considérablement la dispersion du cobalt et l'activité. Le TiO2, également introduit dans la matrice de β-SiC lors de la synthèse, interagit fortement avec les sites actifs de cobalt, conduisant ainsi à sa grande dispersion et à une meilleure activité et stabilité dans la réaction de SFT. Parallèlement, un catalyseur à base de β-SiC de haute porosité, recouvert d'une couche de dioxyde de titane monocristallin a été développé et testé. Un taux spécifique de 1,2 gC5+. gcat -1. h-1 et une sélectivité en C5+ de 86% ont été obtenus. Ces performances sont les plus élevées signalées jusqu'à présent sur des catalyseurs sans cobalt
The Fischer-Tropsch synthesis (FTS) is a key technology to transform the synthesis gas (2H2 + CO) into liquid hydrocarbons as the basic chemical feedstock. It can be found that the cobalt active sites supported on the materials with high thermal conductivity, opened structure is necessary to accelerate FTS synthesis process in the development of industry catalysts.In this work, a new hierarchical support consisting of α-Al2O3, which is homogeneously covered by a layer of carbon nanotubes, is successfully prepared to support cobalt catalyst. The supported cobalt catalysts show extremely high selectivity towards liquid hydrocarbons along with the better catalytic activity. The FTS performance obtained on this support can be further improved by coating a thin layer of TiO2 on the CNTs surface which significantly improve the cobalt dispersion and in turn,the FTS activity.The TiO2 is also successfully introduced into the matrix of β-SiC during the synthesis process which strongly interacts with cobalt active sites, leading to high dispersion of cobalt, accounting for the better activity and stability in FTS reaction. In the mean time, a highly activity Fischer-Tropsch catalyst based on single crystalline titanium dioxide coated high porosity β-SiC was also developed. The FT specific rate of 1.2 gC5+·gcat -1·h-1 and a C5+ selectivity of 86 % are obtained,which are among the highest FT performance reported up to now on cobalt noble-free catalyst

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Guo, David 1976. "Vector drop-on-demand production of tungsten carbide-cobalt tooling inserts by three dimensional printing". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27064.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (p. 119-120).
Three Dimensional Printing (3DP) is a solid freeform fabrication process used to generate solid parts directly from three-dimensional computer models. A part geometry is created by selectively depositing binder into sequentially spread layers of powder. In slurry-based 3DP, a suspension of powder in a solvent is used to form the powderbed layer. This slurry-based powderbed yields higher green density and part resolution than dry powder-based 3DP because of smaller particle size. Vector printing requires that the printhead trace and define the external geometries of a part before raster filling the interior, a new approach in comparison to conventional, raster-only printing. Drop-on-demand (DOD) printheads allow binder droplets to be ejected when needed rather than relying upon charge-and-deflect mechanisms used in continuous jet printheads. Integrating these concepts for vector, DOD printing has the potential to enhance the 3DP process by providing greater part resolution and surface finish. The 3DP slurry-based process and vector, drop-on-demand printing are examined as potential methods to produce Tungsten Carbide-Cobalt (WC-Co) tooling inserts. The research focuses on three fundamental process steps: (1) development of a stable slurry, (2) determination of jetting parameter values for optimal powderbed deposition, and (3) implementation of vector, DOD printing for the binder. Due to unforeseen circumstances, the first two objectives are only briefly introduced in Chapter 1 and summarized in Chapter 3. Further details may be found in the Diplomarbeit document of Olaf Dambon. Two approaches are explored to develop a stable, jettable slurry. One method involves using a water-based Tungsten Carbide slurry and a
(cont.) Cobalt Acetate binder; the other method utilizes an alcohol-based Tungsten Carbide-Cobalt slurry and an organic binder. Various suspension properties, such as sedimentation density and viscosity, are measured to assess the degree of slurry stability. After adequate slurry formulations are developed, an investigation of powderbed formation is conducted. Due to the low solubility limit of the Cobalt salt in water and the persistent defects in water-based slurry powderbeds, the alcohol-based approach is pursued and, because of its greater efficacy, is used for optimizing powderbed jetting parameters. An effective combination of line spacing, flow rate, and drying time is determined for producing powderbeds with minimal surface roughness and high packing density. Experiments are subsequently conducted in vector DOD printing of various geometries using a piezo-actuated, drop-on-demand printhead and Bridgeport three-axis milling machine. A Hewlett-Packard inkjet cartridge is initially used for vector testing of the milling machine; a Siemens PT-88S printhead is used to assess and optimize binder droplet formation parameters, such as voltage waveform and fluid properties. Functional conditions for vector printing and DOD droplet generation are developed and deliver acceptable performance. Successfully printed geometries with high-definition lines (140-170 [mu]m line width) and smooth surface finish are produced using sanded, jetted alumina slurry powderbeds. Following necessary refinements in slurry redispersion and slurry-binder compatibility, the same vector process can be repeated with jetted WC-Co slurry powderbeds.
by David Guo.
S.M.

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Więcej źródeł

Książki na temat "Carbide–cobalt"

Tungsten Carbide - Cobalt Cermets. Elsevier Science, 2008.

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Części książek na temat "Carbide–cobalt"

Hüttner, W. "110 CCo X 2Σ+ Cobalt carbide". W Diamagnetic Diatomic Molecules. Part 1, 155. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-69954-5_112.

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Christen, Dines. "Molecular Constants of CCo X 2Σ+ Cobalt Carbide". W Molecular Constants Mostly from Microwave, Molecular Beam, and Sub-Doppler Laser Spectroscopy, 262–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49199-7_77.

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Gou, Li, Ji Lei Zhu, Jun Guo Ran i Suang Feng Yan. "Diamond Coated on Cobalt-Deficient Gradient Tungsten Carbide". W High-Performance Ceramics III, 1889–92. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1889.

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Park, S. Y., Moon Chul Kim, Heung Sub Song i Chan Gyung Park. "Functionally Graded Tungsten Carbide Cobalt Coatings Fabricated by Detonation Gun". W Materials Science Forum, 1507–10. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.1507.

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Shao, Gang Qin, Jing Kun Guo, Xing Long Duan, Peng Sun, Z. Xiong i Xiao Liang Shi. "The Core / Rim Structure in Cobalt / Tungsten Carbide Nanocomposite Powder". W Solid State Phenomena, 227–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-30-2.227.

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Zhang, Hao Qiang, X. M. Jia, Y. Gao i Suo Xia Hou. "Study of Inhibition to Leaching of Cobalt from Cemented Carbide Tools". W Advances in Machining & Manufacturing Technology VIII, 546–50. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.546.

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Grigoryev, Evgeny G., i Alexander V. Rosliakov. "The Electro-Discharge Compaction of Powder Tungsten Carbide-Cobalt-Diamond Composite Material". W Ceramic Transactions Series, 205–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470599730.ch20.

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Ashrafizadeh, S. N., M. S. Bafghi, R. Shahbazi i M. R. Hossein. "Recovery of Cobalt and Tungsten from Scrap Carbide Pieces Through a Hydrometallurgic Route". W Electrometallurgy and Environmental Hydrometallurgy, 1605–15. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118804407.ch40.

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Lee, J. S., Je Hyun Lee, Baig Gyu Choi, Chang Yong Jo, Un Gyu Paik i S. G. Gang. "The Solidification Microstructure and Carbide Formation Behaviors in the Cobalt-Based Superalloy ECY768". W Materials Science Forum, 374–77. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-966-0.374.

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Wang, Y., Y. P. Ma, Fang Hong Sun, Zhi Ming Zhang i Ming Chen. "Deposition of Diamond Films on Smooth Surfaces of Cemented Carbide Inserts with Cobalt Boride Interlayers". W Advances in Machining & Manufacturing Technology VIII, 205–9. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.205.

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Streszczenia konferencji na temat "Carbide–cobalt"

Dorfman, M., J. DeFalco i J. Karthikeyan. "Tungsten Carbide-Cobalt Coatings for Industrial Applications". W ITSC 2000, redaktor Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0471.

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Abstract This paper compares the coating characteristics of two HVOF processes: air-cooled converging-nozzle Diamond Jet (DJ) spraying and Hybrid 2600 air/water-cooled converging/diverging technology. WC-Co coatings were deposited on steel substrates using different combinations of spray parameters, gas flow ratios, and cooling gas types. The coatings were then examined and tested to determine the extent to which microstructure, hardness, surface roughness, wear resistance, and deposition efficiency can be controlled. In addition to investigating process relationships, the paper also addresses the issues of practicality and cost.

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Zhang, Xiuling, Xiaoming Jia i Yuexing Song. "Study on hydration of tungsten carbide and cobalt in cemented carbide tool". W 2010 International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2010. http://dx.doi.org/10.1109/mace.2010.5535470.

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Glaeser, Thorsten, Axel Demmer i Fritz Klocke. "Liquid-Phase Sintering of Tungsten Carbide-Cobalt by Laser Radiation". W ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59534.

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Laser Sintering is a powder metallurgical process. The principle of Laser Sintering is based on a local densification of powdered materials as a result of the absorption of laser radiation. Through a cyclic repetition of material application, densification and the lowering of a build-up plate, a three dimensional geometry develops. Within the Laser Sintering (liquid-phase sintering) of tungsten carbide-cobalt (WC-Co) the low melting material, the metal binder phase cobalt, is temporarily transferred into the liquid phase. The high melting WCphase is not melted and remains fine dispersed in the metal binder phase after cooling of the material.

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Wang, Xin, i Patrick Kwon. "Dry Turning of Commercially Pure Aluminium With Carbide Tools". W ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34064.

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Dry turning test was performed on commercial pure aluminum Al1100 with two grades of carbide (WC-Co) tool, fine and coarse grained grades. Because of the tiny amount of abrasives in Al1100, the resulting tool wear is mainly sliding wear on flank surface. In our experiment, the fine grain carbide tool has more wear than coarse grain carbide tool despite of the miniscule wear on both carbide grades tools. Notably, the microfracture was only observed on the fine grain carbide tool’s nose due to the low fracture resistance of fine grain carbide. Using Confocal Laser Scanning Microscopy (CLSM) and wavelet filtering, the built up edge (BUE) and tool wear evolutions were analyzed. The volume of BUE becomes the maximum at the beginning of the machining and diminishes as the cobalt was worn down from the tool surface, eventually reaching a relatively steady state after half hour’s turning. The fine grain carbide tool have more built up edge than coarse grain carbide tool because of the higher cobalt content with the fine grain carbide. Oxygen from the air may play a very important role in the adhesion between aluminum and carbide tool. Two types of built up edge was found in the experiment. The first type BUE is huge and covers whole tool surface, which is mainly aluminum. The second type BUE is very thin (∼1–2microns), which covers relatively small area of tool surface. This location is characterized by both high temperature and the presence of the oxygen from the air trapped between tool and work material. This second type of BUE has much better resistance to the NaOH solution, which is metal oxide (Aluminum oxide or complex oxide such as spinel), and it could increase the adhesion between tool and work material. Mainly, in dry turning commercial pure aluminum, the larger carbide grain size has a better wear performance.

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Fujieda, S., A. Yomogida, K. Shinoda i S. Suzuki. "Synthesis of Cobalt-Based Carbide Particles by Polyol Process and Their Magnetic Properties". W 2016 International Conference of Asian Union of Magnetics Societies (ICAUMS). IEEE, 2016. http://dx.doi.org/10.1109/icaums.2016.8479796.

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Angelastro, Andrea, Sabina L. Campanelli, Antonio D. Ludovico i Simone Ferrara. "Direct laser metal deposition of tungsten carbide–cobalt-chrome (WC/Co/Cr) powder". W ICALEO® 2011: 30th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2011. http://dx.doi.org/10.2351/1.5062219.

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Waratta, A., M. Hamdi, T. Ariga, Mohamad Rusop, Wong Tin Wui, Norlida Kamarulzaman, Rihanum Yahaya Subban i in. "Effect of Decreasing of Cobalt Content in Properties for Diamond∕Cemented Carbide Tools". W INTERNATIONAL CONFERENCE ON ADVANCEMENT OF MATERIALS AND NANOTECHNOLOGY: (ICAMN—2007). AIP, 2010. http://dx.doi.org/10.1063/1.3377813.

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Waldorf, Daniel, Scott Liu, Michael Stender i Daniel Norgan. "Alternative Binder Carbide Tools for Machining Superalloys". W ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72369.

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This study examines the performance of a new class of wear-resistant but economical cutting tools produced by varying the binder composition of standard cemented carbide composites. By replacing some or all of the cobalt binder with rhenium and nickel-based superalloy, a stronger composite tool results, potentially capable of machining heat-resistant superalloys at significantly higher cutting speeds. Sample tools with alternative binder were produced and compared to standard tools bound with cobalt only. Turning experiments on Inconel 718 were run to evaluate wear resistance and tool life for several grades. The experimentation also examined the effects of varying the relative proportions of each binder constituent as well as the overall binder percentage in the composite. Results show a clear advantage of the alternative binder tools as evidenced by a 150% increase in tool life or the equivalent of an 18% increase in cutting speed. Although increasing amounts of rhenium in the binder show a positive effect on performance, the effects of superalloy and overall binder % are inconclusive.

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Chi, Jingqi, Bin Dong, Yongming Chai i Chenguang Liu. "Pitaya-like cobalt/molybdenum carbide encapsulated in N-doped carbon nanospheres toward efficient hydrogen evolution". W MATERIALS SCIENCE, ENERGY TECHNOLOGY AND POWER ENGINEERING III (MEP 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5125366.

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Grigoryev, Evgeny G., Francisco Chinesta, Yvan Chastel i Mohamed El Mansori. "Electric Discharge Sintering and Joining of Tungsten Carbide—Cobalt Composite with High-Speed Steel Substrate". W INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES (AMPT2010). AIP, 2011. http://dx.doi.org/10.1063/1.3552540.

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