Results 161 to 170 of about 23,668 (218)

Electrochemical preparation of tungsten, tungsten carbide and cemented tungsten carbide

Mineral Processing and Extractive Metallurgy, 2013
Tungsten is conventionally made by the reduction of tungsten oxide with hydrogen, tungsten carbide by the reaction of tungsten with carbon and cemented tungsten carbide by the sintering together of tungsten carbide with a metal, usually cobalt. This paper reports the electrochemical preparation of tungsten, tungsten carbide and cemented tungsten ...
D.-H. Tran-Nguyen, D. Jewell, D. J. Fray
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CEMENTED TUNGSTEN CARBIDE PNEUMOCONIOSIS

Acta Pathologica Japonica, 1978
An autopsy case of cemented tungsten carbide pneumoconiosis, the first lethal case in our country, is presented. A 28‐year‐old woman, who had been engaged in grinding presintered metallic matrix for four years, developed respiratory symptoms. X‐ray examinations were indicative of interstitial pulmonary fibrosis.
H, Kitamura, H, Kitamura, T, Tozawa, Y, Kimula   +3 more
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Low Temperature Tungsten, Tungsten Carbide and Tantalum Carbide Film Growth

MRS Proceedings, 2000
Abstract:Low temperature chemical vapor deposition of tungsten, tungsten carbide and tantalum carbide films on SiO2/Si(100) surfaces was studied by X-ray photoelectron spectroscopy (XPS) and electron microscopy. Tungsten carbide films were deposited using the W(CO)6precursor with and without ethylene over temperatures ranging from 250 to 500 °C.
Y.-M. Sun, S.Y. Lee, E. R. Engbrecht, K. Pfeifer, S. Smith, J. M. White, J. G. Ekerdt   +6 more
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Nanocrystalline Tungsten Carbide

2013
In this chapter, attention will be given mainly to the production methods and investigation of particle size, microstructure and some properties of powders of tungsten carbide WC with a particle size from 20 to 200–300 nm, i.e. nanocrystalline and submicrocrystalline powders. Using an X-ray diffraction method for determining small particle size will be
Alexey S Kurlov, Aleksandr I. Gusev
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Production of Tungsten and Tungsten Carbide Powders

Powder Metallurgy and Metal Ceramics, 2019
A method has been developed to process waste of tungsten–cobalt solid solutions by potentiostatic dissolution in phosphoric acid solutions. A dissolution mechanism depending on the electrode potential has been proposed. A technique for extracting tungsten from tungsten concentrates in chloride–metasilicate melts has been developed.
V. V. Malyshev, N. F. Kushchevska
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Why Tungsten Carbide?

Aircraft Engineering and Aerospace Technology, 1985
THE introduction of tungsten carbide as a suitable material for precision gauge blocks began almost by accident.
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Tungsten-Carbide Cutting Tools

Transactions of the American Society of Mechanical Engineers, 1929
Abstract Results are given in the fabrication of tools of tungsten carbide, and experiences are detailed of successful and unsuccessful attempts to apply them to various kinds of work. Readjustment of manufacturing practices must take place if there is to be a place in industry for tungsten carbide.
Henry J. Long, W. Paul Eddy
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Indentation Damage in Tungsten Carbide and Tungsten-Titanium Carbide

1983
Tungsten carbide (WC) is the main constituent of cemented carbides used for metal machining and rock drilling. Titanium carbide (TiC) is added to some grades of WC-Co to improve wear resistance in cutting metals. These grades contain both hexagonal WC and cubic (W, Ti)C solid solutions as the principal hard phases.
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Stoichiometric tungsten carbide coatings

AIP Conference Proceedings, 1996
Filament Assisted Chemical Vapor Deposition (FA‐CVD) technique has been used to prepare tungsten carbide (WC) thin films. With this simple technique we obtained polycrystalline and stoichiometric WC coatings deposited on crystalline silicon and on stainless steel substrates.
G. A. Hirata, O. Contreras, M. H. Farías, L. Cota-Araiza   +3 more
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Tungsten Carbide and Tungsten-Molybdenum Carbides as Automobile Exhaust Catalysts

1987
Several catalyst samples of tungsten carbide and W,Mo mixed carbides with different Mo/W atom ratios, have been prepared to test their ability to remove carbon monoxide, nitric oxide and propane from a synthetic exhaust gas simulating automobile emissions. Surface characterization of the catalysts has been performed by X-ray photoelectron spectroscopy (
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