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Palm's Tungsten E was the cheapest of the Tungsten series, and as such, has been one of the most successful. [citation needed] It has 32 megabytes of memory, a Texas Instruments OMAP (ARM) 126 MHz processor, a 2 + 1 ⁄ 8-by-2 + 1 ⁄ 8-inch (54 mm × 54 mm) transreflective TFT screen, and ran Palm OS 5.2.1.
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through sintering [7] for use in industrial machinery, engineering facilities, [8] molding blocks, [9] cutting tools, chisels, abrasives, armor ...
The coefficient of thermal expansion of cemented tungsten carbide is found to vary with the amount of cobalt used as a metal binder. For 5.9% cobalt samples, a coefficient of 4.4 μm/m·K was measured, whereas 13% cobalt samples have a coefficient of around 5.0 μm/m·K.
Tungsten carbides (W 2 C and WC) are produced by heating powdered tungsten with carbon. W 2 C is resistant to chemical attack, although it reacts strongly with chlorine to form tungsten hexachloride (WCl 6). [17] In aqueous solution, tungstate gives the heteropoly acids and polyoxometalate anions under neutral and acidic conditions.
Tungsten was discovered in 1781 by Swedish chemist Carl Wilhelm Scheele. Tungsten has the highest melting point of all metals, at 3,410 °C (6,170 °F). Filament of a 200 watt incandescent lightbulb highly magnified. Up to 22% Rhenium is alloyed with tungsten to improve its high temperature strength and corrosion resistance.
The first time that A15 structure was observed was in 1931 when an electrolytically deposited layer of tungsten was examined. [2] Discussion of whether the β-tungsten structure is an allotrope of tungsten or the structure of a tungsten suboxide was long-standing, but since the 1950s there has been many publications showing that the material is a true allotrope of tungsten.