tungsten carbide 1002
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- tungsten carbide 1002
Thrifty catalysis: Tungsten carbide microspheres with high surface area and CO chemisorption capacity were prepared by heating mixtures of a resorcinol–formaldehyde polymer and ammonium metatungstate.Platinum supported on these microspheres (see electron micrograph) shows higher activity than the commercial catalyst with 20 % Pt–Ru …
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Lignins isolated from representative hardwood, softwood, and grass materials were effectively hydrocracked to aromatics catalyzed by tungsten carbide over activated carbon (W 2 C/AC). The effects of botanical species and fractionation methods on lignin structure and the activity of W 2 C/AC were studied in detail. Gas permeation …
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Tungsten carbide is one of the most promising electrocatalysts for the hydrogen evolution reaction, although it exhibits sluggish kinetics due to a strong tungsten-hydrogen bond. In addition ...
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Carbides/carbon composites are emerging as a new kind of binary dielectric systems with good microwave absorption performance. Herein, we obtain a series of tungsten carbide/carbon composites through a simple solvent-free strategy, where the solid mixture of dicyandiamide (DCA) and ammonium metatungstate (AM) is employed …
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Mingxing Wu, Xiao Lin, Anders Hagfeldt, Tingli Ma, Low‐Cost Molybdenum Carbide and Tungsten Carbide Counter Electrodes for Dye‐Sensitized Solar Cells, Angewandte Chemie International Edition, 10.1002/anie.201006635, 50, 15, (3520-3524), (2011).
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21 rowsAt Total Carbide we offer, as standard, a full range of Tungsten Carbide Grades. We would be happy to assist in grade selection. For unique applications, special …
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EXPERIMENTAL The oxidation experiments were performed on bulk polycrystalline tungsten and tungsten car- bide. The tungsten samples were cut out of a 1-mm-thick, 99-95% pure, tungsten foil and were approximately 1x1 cm2. The tungsten car- bide samples were cut from 3-mm-thick, hot- pressed test bars with a porosity of 0-005 …
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Hard tungsten carbide (WC) with brittle behavior is frequently applied for mechanical purposes. Here, ultralarge elastic bending deformation is reported in defect-rare WC [0001] nanowires; the tested bending strain reaches a maximum of 20% ± 3.33%, which challenges the traditional understanding of this material.
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Its large-scale application is hindered by low energy efficiency and insufficient cost effectiveness due to the indispensable use of costly and scarce noble metals. 1-3 Since the first report of Pt-like catalytic …
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This study investigates the structure and properties of Titanium carbide (TiC) and Tungsten carbide (WC) nanoparticles. The X-ray diffraction patterns confirm the presence of a hexagonal structure in WC nanoparticles and cubic structure in …
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The total shrinking factor from the polymer state to the reduced state was 2.13 ± 0.08. The tungsten carbide samples were analyzed accordingly (see Figure 4b and Table S9 Supporting Information for the shrinking analysis of tungsten carbide). The beam diameters of the polymeric octet lattices shrank from 14.6 ± 0.8 to 11.1 ± 0.3 μm in the ...
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Synergistic Effect of Molybdenum and Tungsten in Highly Mixed Carbide Nanoparticles as Effective Catalysts in the Hydrogen …
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Resonant two-photon ionization spectroscopy has been used to study the diatomic transition-metal carbide, WC. A low-resolution scan revealed a five-member vibrational progression beginning with the 0-0 band at 17 585 cm −1. Analysis of this progression yielded a vibrational frequency of ω e ′ (184 W 12 C)=752.6(4.9) cm −1 and a …
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Norton double-cut carbide burrs withstand the most demanding production runs due to the hardness of their tungsten carbide substrate, plus their stronger tooth formulation. MY CHOICES. clear all. Market. Manufacturing & Industry. Metal Fabrication/Welding. Transportation. Machine. Portable Grinders. Die Grinder. Burr Shape.
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The atomic layer deposition (ALD) of tungsten carbide films is described with a thermal process employing WCl 6 and AlMe 3 as precursors. WCl 6 has not been previously reported as an ALD precursor. The as-deposited films are amorphous, which could indicate superior performance as a Cu diffusion barrier over previously studied …
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Constructing hierarchical heterostructures is considered a useful strategy to regulate surface electronic structure and improve the electrochemical kinetics. Herein, the authors develop a hollow architecture composed of MoC 1-x and WC 1-x carbide nanoparticles and carbon matrix for boosting electrocatalytic hydrogen evolution and …
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Al 0.1 CoCrFeNi-high entropy alloy (HEA) /tungsten carbide (WC)metal matrix composite was successfully prepared by mechanical alloying and subsequent spark plasma sintering. The different volume fraction of WC was distributed evenly by varying the powder milling parameters from gentle milling (~1.37% WC) and intensive milling …
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A removable ceramic coating method is used to generate metal-terminated transition-metal carbide nanoparticles with strict control over size, composition, and crystal phase. Tungsten carbide and molybdenum tungsten carbide nanoparticles in the 1–4 nm range achieve activities 100-fold higher than commercial carbides and within an order of …
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Tungsten carbide is the result of combining or alloying carbon with tungsten, hard and dense metal with a high melting point. Tungsten carbide is a deep gray color in its untreated, natural state ...
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Its carbide, i.e., tungsten carbide, is used in tool manufacturing because of its outstanding hardness and as a catalyst scaffold due to its morphology and large surface area. However, microstructuring, especially high-resolution 3D microstructuring of both materials, is a complex and challenging process which suffers from slow speeds and ...
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Doped to the core: Core–shell-structured tungsten carbide encapsulated within nitrogen-doped carbon (TCNC) spheres are successfully prepared through in situ polymerization followed by carburization, and exhibit high electrocatalytic activity and excellent stability toward the hydrogen evolution reaction in both acidic and alkaline …
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Nanopowders. Oleg D. Neikov, in Handbook of Non-Ferrous Metal Powders, 2009 Fiber-reinforced Material. Tungsten carbide nanorods, with diameters between 2 and 40 nm …
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Among the emergent phenomena, superconductivity is of particular interest. Here, by depositing metal films on a newly identified topological semimetal tungsten carbide (WC) single crystal, interfacial superconductivity is obtained, evidenced from soft point-contact spectroscopy.
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Breaking up: Tungsten carbide shows remarkable activity in selective C−O bond cleavage of typical β-O-4 model compounds and deconstruction of lignin feedstocks. High yields of C−O cleavage products from model compounds (up to 96.8 %) and from lignin feedstock (up to 70.7 %) are obtained without destroying the aromatic rings.
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Here, vertically aligned porous cobalt tungsten carbide nanosheet embedded in N-doped carbon matrix (Co 6 W 6 C@NC) is successfully constructed on flexible carbon cloth (CC) as an efficient bifunctional electrocatalyst for overall water splitting via a facile metal–organic framework (MOF) derived method. The synergistic effect of Co and W ...
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This review article summarizes reports for Z-selective olefin metathesis reactions by molybdenum, tungsten, ruthenium, and vanadium catalysts. It is clearly demonstrated that the ligand modifications play essential roles in achieving the stereospecific olefin metathesis reactions.
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Sunny prospects for renewable energy: Molybdenum and tungsten carbides embedded in ordered nanomesoporous carbon materials as well as Mo 2 C and WC are proposed as alternatives to the expensive platinum counter electrode (Pt CE). The preparation of the CEs was optimized, and the dye-sensitized solar cells (DSCs; see …
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Ultrathin tungsten carbide (WC) crystals provide an ideal platform for exploring exotic transport properties arising from the three-component fermion in the 2D limit. The magnetotransportment reveals...
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The surface composition and electronic structure of tungsten carbides prepared by direct synthesis and carburization of white tungstic acid were studied with X-ray photoelectron spectroscopy. The experimental results show that WO3 and free carbon are present on the surface of the carbides. For the high surface area tungsten carbide …
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Tungsten carbide exhibits platinum-like behavior, which makes it an interesting potential substitute for noble metals in catalytic applications. Tungsten carbide nanocrystals (≈5 nm) are directly synthesized through the reaction of tungsten precursors with mesoporous graphitic C 3 N 4 (mpg-C 3 N 4 ) as the reactive template in a flow of …
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