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 …
Elemental analysis of the reduced tungsten samples showed 93 at% tungsten and 7 at% oxygen. The tungsten carbide samples revealed an atomic ratio of …
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 ...
The most common form of W is tungsten carbide, which is used in making cutting tools . Exposure to W can be from natural or anthropogenic sources. Occupational exposure occurs via dust inhalation during mining W metal from the ore and during preparation of tungsten carbide products. ... 2007; 172:1002–1005. doi: …
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 …
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 …
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 ...
Herein, we show that directional bonding arising from the mixed covalent/metallic character plays a critical role in governing the surface chemistry. This behavior can be described by consideration of individual d-band components. We use this model to predict efficient catalysts based on tungsten carbide with a sub-monolayer of …
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 …
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 ...
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 …
Compact Sharpener with Carbide and Ceramic Slots. The Mycro Knife Sharpener is an extremely compact sharpening platform that can sharpen almost any dull knife with a few quick strokes. The tungsten carbide side helps reshape a dull blade, and the ceramic side hones a blade to a sharp edge. The anodized aluminum construction is light and ...
Development of nonnoble metal catalysts for hydrogen evolution reaction (HER) is critical to enable an efficient production of hydrogen at low cost and large scale. In this work, a novel bimetallic carbide nanostructure consisting of Mo 2 …
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).
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 …
DOI: 10.1002/cssc.201600901 Abstract A remarkably effective method for the chemoselective cleavage of the C-O bonds of typical β-O-4 model compounds and the deconstruction of lignin feedstock was developed by using tungsten carbide as the catalyst.
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.
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 …
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 …
Tungsten may play a role in cases of pulmonary fibrosis related to hard metal lung disease. 12, 13 This is a giant cell interstitial pneumonitis which is contracted from inhaling the dust formed during the processing of hard metal, a material composed of tungsten carbide and cobalt. However, the majority of the toxicity reports may be ...
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 …
Nickel saves dimes: The expense of using precious-metal catalysts is avoided in the high-yielding conversion of cellulose to ethylene glycol (see picture; AC=activated carbon).This process occurs in up to 29 % yield over a tungsten carbide catalyst, and in up to 61 % yield when the catalyst is promoted with a small amount of …
The development of new catalytic systems for the conversion of biomass-derived molecules into liquid fuels has attracted much attention. We propose a non-noble bimetallic catalyst based on nickel–tungsten carbide for the conversion of the platform molecules 5-(hydroxymethyl)furfural into the liquid-fuel molecule 2,5-dimethylfuran (DMF).
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 …
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...
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 …
Tungsten Carbide Microspheres as a Noble-Metal-Economic Electrocatalyst for Methanol Oxidation †. Raman Ganesan Dr., Jae Sung Lee Prof. First published: 07 …
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 …
Tungsten carbide 195.86 2870 6000 insoluble Ammonium paratungstate 3042.55 23 g/l Ammonium dithiotungstate 316.05 Ammonium tetrathio-tungstate 348.18 1 Toxic Effects and Mode of Action Inhaled tungsten and tungsten compounds are first deposited in the respiratory tract and, later on, enter the blood system within a few days.
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 ...