• Electronic Structure and Catalytic Behavior of Tungsten ...

    Abstract. Tungsten carbide has been shown to be an effective catalyst for a number of reactions that are readily catalyzed by platinum, but not at all by tungsten, and it was speculated that this behavior is due to changes in the electron distribution when carbon is added to tungsten.

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  • Mechanical and tribological behaviour of tungsten carbide ...

    ABSTRACTAluminum-based metal matrix composites (AMCs) play a vital role for potential applications in aerospace and automotive industries. This paper explores the experimental analysis of a composite with aluminum LM4 alloy as the matrix and tungsten carbide (WC) as the reinforcement material.

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  • Tensile Behavior of Tungsten and Tungsten-Alloy Wires to

    TENSILE BEHAVIOR OF TUNGSTEN AND TUNGSTEN-ALLOY WIRES FROM 1300 TO 1600 K Hee Mann Yun* National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio 44135 S umma ry The tensile behavior of 200-pm-diameter tungsten lamp (218CS-W>, tungsten

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  • Amorphous carbon modified nano-sized tungsten carbide as …

    Nano-sized tungsten carbide (WC) is a new promising platinum-like catalyst for gas diffusion electrodes, not only due to its catalytic behavior, which is close to that of platinum, but

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  • The Precipitation Behavior of Alloy Carbides in Heat ...

    Insights into carbideprecipitation will contribute to a better understanding of the precipitation behavior of alloycarbides under high magnetic fields.This paper systematically studied the characteristics and laws of the carbide precipitation inFe-C-Mo and2.25Cr-Mo alloy steels.

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  • OXIDATION BEHAVIOR OF TUNGSTEN CARBIDE-20COBALT …

    Oxidation behavior of tungsten carbide cobalt is an important research topic when dealing with WC-Co composite. The lifespan and working efficiency of WC-Co cemented carbide as cutting tools in air are strongly depending on its oxidation resistance. A study of the oxidation process was

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  • Advances in Materials Science and Engineering - Hindawi

    Advances in Materials Science and Engineering is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in …

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  • Dynamic Compaction of Tungsten Carbide Powder

    The shock compaction behavior of a tungsten carbide powder was investigated using a new experimental design for gas-gun experiments. This design allows the Hugoniot properties to be measured with reasonably good accuracy despite the inherent difficulties involved with distended powders. ...

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  • WEAR BEHAVIOUR OF TUNGSTEN CARBIDE/COBALT …

    In the present work Tungsten carbide/cobalt alloy was HVOF sprayed on the surface of AA7075 alloy substrate. The wear behavior of the WC-Co(17%) coating was investigated using a pin-on-disk test in which the wear rate depends on the applied load. In the thermal spraying

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  • Thermal-Shock Resistance and Fracture-Strength Behavior of ...

    tion on the thermal-shock resistance and fracture-strength behavior of two cemented carbides (a tungsten carbide and a titanium car- bide). Both (KIc/af)2 and the retained strengths for these carbides are determined as a function of temperature (25" to lOOO"C), and possible influences of loading rates and the effects of different

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  • Cemented Tungsten Carbides - 1st Edition - Elsevier

    Written by an international expert, this book covers the processing, microstructure, and properties of cemented tungsten carbides. It is divided into 18 chapters covering wide areas from crystal structure to phase equilibria, production of metal and carbide powders, and much more.

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  • BEHAVIOR OF TUNGSTEN CARBIDE IN WATER STABILIZED …

    Tungsten carbide WC is an important and irreplaceable material in applications like high speed cutting or high pressure forming. Its main disadvantages are complex phase behavior, decomposition to W2C at high temperatures, etc. Thus, tungsten carbide parts can be produced only by sintering with (mostly cobalt-based) binders; in this way, however,

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  • Cemented Tungsten Carbides | ScienceDirect

    In cemented carbide systems, where the higher melting phase is the harder phase, liquid phase sintering results in a two phase composites material with ductile behavior in …

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  • Friction and Wear Behavior of Cemented Carbides

    In case of reactive sintering the elemental powders of tungsten, carbon black as graphite source and cobalt at first activated throw high energy milling and then the carbide synthesis is taking ...

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  • Platinum-Like Behavior of Tungsten Carbide in Surface ...

    Tungsten carbide catalyzes the formation of water from hydrogen and oxygen at room temperature, the reduction of tungsten trioxide by hydrogen in the presence of water, and the isomerization of 2 ...

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  • Tungsten Carbide Material Safety Data Sheet by Federal Carbide

    No data on the behavior of tungsten carbide in the environment are available. However, data for sodium tungstate and tungsten metal are expected to adequately capture the range of mobility of tungsten carbide in the environment.

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  • Wear and Corrosion Behavior of Tungsten Carbide Based ...

    The aim of this study is to investigate the wear and corrosion behavior of tungsten carbide 10 wt.% nickel (WC-10Ni) and tungsten carbide 12 wt.% w cobalt (WC-12Co) coating deposited onto medium carbon steel (Cast steel BS 3100 GR A3) blade. The blade was …

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  • Rheological properties of cemented tungsten carbide ...

    Sep 23, 2012· The rheological behavior of feedstock needs to be examined for manufacturing parts without defects by micro powder injection molding (μPIM). In this study, submicron tungsten carbide (WC) and cobalt (Co) were milled for several hours.

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  • Effect of tungsten carbide addition on the tribological ...

    Tungsten carbide (WC) is widely used in cemented carbides and mechanical components, since it meets the requirements of high hardness, high wear resistance, low thermal expansion coefficient and good wettability with molten metal [20,21].

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  • The strength and rheology of commercial tungsten carbide ...

    Abstract. Uniaxial compressive stress-strain curves have been measured on a suite of 26 commercial grades of tungsten carbide cermets and three maraging steels of …

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  • Tungsten carbide - Wikipedia

    Tungsten carbide is widely used to make the rotating ball in the tips of ballpoint pens that disperse ink during writing. Tungsten carbide is a common material used in the manufacture of gauge blocks, used as a system for producing precision lengths in dimensional metrology. [citation needed]

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  • Sliding wear behavior of tungsten carbide ... - SpringerLink

    Tungsten carbide (WC) thermal spray coatings have gained increased acceptance for commercial aircraft applications driven by the desire to replace chromium electroplate due to environmental and economic considerations.

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  • Effect of Zirconia and Nickel Doping on the Reduction ...

    tungsten carbide synthesized by a solid-state reaction between W metal and C at 1200 – 2000 ºC under controlled atmosphere [6]. ... Behavior of Tungsten Oxide in Carbon Monoxide Atmosphere . Fairous Salleh, Tengku Shafazila Tengku Saharuddin, Alinda Samsuri, Rizafizah Othaman, and Mohd.

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  • Electrochemical machining of tungsten carbide - iranarze.ir

    Tungsten and tungsten carbide Anodic behavior of tungsten Tungsten is covered by thin stable oxide layers under atmo-spheric conditions, as well as in acidic solutions and neutral solutions. The oxide is reported to be an amorphous WO 3 [21]. Hence, the oxide is formed in acidic or neutral solutions

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  • Electronic structure and catalytic behavior of tungsten ...

    The W‐C bonding is covalent in nature with some charge transfer from the W to the C atoms. The increase in the occupancy of the d shell of the W atoms and the position of the Fermi level may account for the platinum‐like catalytic behavior of tungsten carbide.

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  • Platinum-Like Behavior of Tungsten Carbide in ... - Science

    Tungsten carbide catalyzes the formation of water from hydrogen and oxygen at room temperature, the reduction of tungsten trioxide by hydrogen in the presence of water, and the isomerization of 2,2-dimethylpropane to 2-methylbutane. This catalytic behavior, which is typical of platinum, is not exhibited at all by tungsten.

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  • Simulation of Ballistic Impact of a Tungsten Carbide ...

    by spheres of tungsten carbide (WC) striking confined cylinders of silicon carbide (SiC) at velocities between 63 m/s to 500 m/s. In this study, the WC was modeled using the ... is this inferred behavior, such as how the ceramic transitions from the intact strength to its failed strength and the actual strength of the comminuted material, which ...

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  • US Tungsten Scrap Dealers Report Strange Market Behavior ...

    And he is not the only one to report bizarre behavior in this segment of the supply chain. At a time when tungsten prices have soared, ... Carbide tools rely heavily on scrap. If the Chinese take ...

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  • Study of Tungsten Carbide Behavior in Hot Forging Application

    B. TUNGSTEN CARBIDE PROPERTIES COMPARED TO STEEL The following is a list of Properties of Tungsten Carbide based hard material with cobalt binder. Different Grades of Tungsten Carbide will differ in Strength, Rigidity, and other Properties, but all Tungsten Carbide Material falls into the basic properties listed below. [4]

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  • Wear Behaviour of Two Different Cemented Carbide Grades in ...

    In this study, wear behavior of two different cemented carbide grades with roughly the same fraction of binder phase and carbide phase but different grain size, in turning austenitic stainless steel is investigated. ... High temperature hardness of tungsten carbide, metallurgical Transactions, 14 …

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