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Topic: Tungsten

Related Topics

Tungsten T2

Manganese

Chromium

Zinc

Rhenium

Metal

Iron

Molybdenum

Tungsten carbide

Tantalum

Tantalum

Osmium

Caesium

Group 6 element

	C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - TUNGSTEN
		When a tungsten filament is heated in a vacuum, the electrons near the surface become energetic enough to be emitted into the surrounding space.
		My personal introduction to tungsten as a structural material was at Kennametal, a producer of tungsten carbide metal-cutting tools, where I took an internship in my senior year while studying chemistry at a small liberal arts college in Latrobe, Pa. The position involved sample preparation for X-ray fluorescence.
		Although we may not realize it, tungsten continues to be a part of our lives because it is still used in lighting and electrical contacts; in electronics, including cell phones and pagers; in cutting tools and engine components; in radiation shielding; and now in sporting goods such as golf balls and shot.
	pubs.acs.org /cen/80th/tungsten.html (0 words)

	REMBAR Tungsten Technical Info
		Tungsten's high density is used in conjunction with copper, nickel, iron, and cobalt to form heavy metal.
		Since tungsten rod has a high degree of strength at elevated temperatures, it is utilized structurally to hold or support high temperature sources such as filaments and heaters for lamp and electronic uses.
		Tungsten rod that is specially processed and manufactured for welding rod applications is used extensively in such processes as inert-gas-shielded arc welding and atomic hydrogen arc welding.
	www.rembar.com /Tungsten.htm (1923 words)

	Tungsten - Wikipedia, the free encyclopedia
		Tungsten can be cut with a hacksaw when it is very pure (it is brittle and hard to work when impure) and is otherwise worked by forging, drawing, or extruding.
		Tungsten chemical compounds are used in catalysts, inorganic pigments, and tungsten disulfide high-temperature lubricants which is stable to 500 °C (930 °F).
		Tungsten Carbide has recently been used in the fashioning of jewelry due to its hypoallergenic nature and the fact that due to its extreme hardness it is not apt to lose its luster like other polished metals.
	en.wikipedia.org /wiki/Tungsten (1451 words)

	Tungsten Handheld - Wikipedia, the free encyclopedia
		The Tungsten series, first introduced in Fall of 2002 with the Tungsten T, was part of Palm, Inc.'s move away from arcane model numbers, Palm OS 4, and aging Motorola processors.
		The Tungsten T, introduced in November 2002 and known during development as the M550, was the test balloon for both Palm OS 5 and the entire Tungsten line.
		Tungsten T5 The Tungsten T5 is combination of the Tungsten E and Tungsten T3, the first to have a 416 MHz Intel PXA270 processor and sports a 320x480 TFT 16-Bit Color Screen instead of a 320x320 Color Screen with a hard input area.
	en.wikipedia.org /wiki/Tungsten_Handheld (2710 words)

	tungsten. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Tungsten is usually added to steel in the form of ferrotungsten, obtained by the reduction of ferrous tungstate in an electric furnace.
		Tungsten carbide is used in place of diamond for dies and as an abrasive.
		Tungsten is usually prepared from the trioxide by reduction with hydrogen or carbon.
	www.bartleby.com /65/tu/tungsten.html (385 words)

	Tungsten - MSN Encarta
		Tungsten, symbol W (from the earlier name, wolfram), metallic element that has the highest melting point of any metal.
		Tungsten is one of the transition elements of the periodic table (see Periodic Law).
		Tungsten is insoluble in hot and cold water and in alcohol, slightly soluble in ammonia and nitric acid, and soluble in hot, concentrated potassium hydroxide.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761552735 (386 words)

	Tungsten (Site not responding. Last check: )
		Tungsten occurs in wolframite, scheelite, huebnertie, and ferberite.
		tungsten and its alloys are used extensively for filaments for electric lamps, electron and television tubes, and for metal evaporation work; for electrical contact points for automobile distributors; X-ray targets; windings and heating elements for electrical furnaces; and for numerous spacecraft and high-temperature applications.
		Tungsten disulfide is a dry, high-temperature lubricant, stable to 500C.
	www.scescape.net /~woods/elements/tungsten.html (362 words)

	Chemistry : Periodic Table : tungsten : key information
		Small and large samples of tungsten wire like this, as well as foil, sheet, wire straight cut lengths, insulated wire, and mesh (and tungsten alloys in wire form), can be purchased from Advent Research Materials via their web catalogue.
		Pure tungsten is a steel-gray to tin-white metal.
		Tungsten has the highest melting point and lowest vapour pressure of all metals, and at temperatures over 1650°C has the highest tensile strength.
	www.webelements.com /webelements/elements/text/W/key.html (179 words)

	USGS Minerals Information: Tungsten
		Tungsten (W) is a metal with a wide range of uses, the largest of which is as tungsten carbide in cemented carbides.
		Tungsten composites are used as a substitute for lead in bullets and shot.
		Tungsten chemical compounds are used in catalysts, inorganic pigments, and high-temperature lubricants.
	minerals.usgs.gov /minerals/pubs/commodity/tungsten (218 words)

	Tungsten (W) - Chemical properties, Health and Environmental effects
		Tungsten is used in filaments in incandescent light bulbs, it is also used in electric contacts and arc-welding electrodes.
		Tungsten is used in alloys, such as steel, to which it imparts great strength.
		Very little tungsten has been detetced in the dew soils that have been analysed for it, although around an ore-processin plant in Russia levels as high as 2000 ppm were found.
	www.lenntech.com /Periodic-chart-elements/W-en.htm (506 words)

	Tungsten
		Large doses of tungsten, administered to the chick either by injection or by feeding, increased tissue concentrations of tungsten and decreased tissue concentrations of molybdenum and tissue activities of xanthine dehydrogenase.
		When tungsten was administered to chicks fed on a semi-synthetic diet containing abnormally low concentrations of molybdenum, the activity of hepatic xanthine dehydrogenase was reduced to negligible levels.
		Acetylene hydratase of Pelobacter acetylenicus is a tungsten iron-sulfur protein involved in the fermentation of acetylene to ethanol and acetate.
	www.ithyroid.com /tungsten.htm (5220 words)

	American Elements: Tungsten Supplier & Technical Information
		Tungsten has the highest melting point of all the metallic elements and because of this has its first significant commercial application as the filament in incandescent light bulbs and fluorescent light bulbs.
		Tungsten is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder.
		Tungsten forms compounds with calcium and magnesium that have phosphorescent properties and are used in the glass coatings for fluorescent light bulbs.
	www.americanelements.com /ww.html (565 words)

	Tungsten Wire History
		The word "Tungsten" was probably first used by A. Cronstedt in 1755, who applied it to the mineral subsequently known as "scheelite," which is the natural form of calcium tungstate.
		For many years tungsten remained one of the rare elements, and it was not until 1847, when Oxland took out a patent for the manufacture of sodium tungstate, tungstic acid, and tungsten from cassiterite (tinstone), that the element became of any industrial importance.
		in diameter was employed as the base, and this was coated with tungsten by raising it to incandescence in an atmosphere of hydrogen and tungsten hexachloride.
	www.tungsten.com /tunghist.html (1805 words)

	TUNGSTEN Biography (Site not responding. Last check: )
		TUNGSTEN cracked the European market with their first album, but this time they kicked the door down.
		TUNGSTEN felt it was in their best interest to sign with the label.
		With the dawning of a new century ahead, TUNGSTEN took cover away from the madness of it all and began to write the soundtrack that would reflect their lives.
	www.tungstenmusic.com /biography.html (3723 words)

	It's Elemental - The Element Tungsten
		Pure tungsten is a light gray or whitish metal that is soft enough to be cut with a hacksaw and ductile enough to be drawn into wire or extruded into various shapes.
		Tungsten has the highest melting point of all metallic elements and is used to make filaments for incandescent light bulbs, fluorescent light bulbs and television tubes.
		Tungsten disulfide (WS) is a dry lubricant that can be used to temperatures as high as 500°C. Tungsten forms compounds with calcium and magnesium that have phosphorescent properties and are used in fluorescent light bulbs.
	education.jlab.org /itselemental/ele074.html (343 words)

	Custom Ring Designs - About Tungsten
		Tungsten is the strongest material in the world with a tensile strength of 600,000 pounds per square inch.
		Tungsten is a metal that provides a lasting polish and finish along with a brilliant luster.
		Tungsten carbide is a powder poured into a die and crushed, cold fusing the metal, and then baked.
	www.customringdesigns.com /abouttungsten.htm (505 words)

	Tungsten
		The de Elhuyar brothers found in acid in wolframite in 1783 that was identical to the acid of tungsten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
		Tungsten and its alloys are used extensively for filaments for electric lamps, electron and television tubes, and for metal evaporation work; for electrical contact points for automobile distributors; X-ray targets; windings and heating elements for electrical furnaces; and for numerous spacecraft and high-temperature applications.
		Tungsten disulfide is a dry, high-temperature lubricant, stable to 500C.
	www.corrosionsource.com /handbook/periodic/74.htm (368 words)

	tungsten — FactMonster.com
		Tungsten is usually added to steel in the form of ferrotungsten, obtained by the reduction of ferrous tungstate in an electric furnace.
		Tungsten carbide is used in place of diamond for dies and as an abrasive.
		Tungsten is usually prepared from the trioxide by reduction with hydrogen or carbon.
	www.factmonster.com /ce6/sci/A0849681.html (403 words)

	NAI: News Stories (Site not responding. Last check: )
		Tungsten, often described as the "metal from another world" because of its high melting point (3,422 C, or 6,192 F), is better known for its use in light bulbs than in life systems.
		Hydrothermal vents are rich in tungsten and scarce in molybdenum.
		Tungsten, on the other hand, tends to remain soluble in the presence of sulfide.
	nai.arc.nasa.gov /news_stories/news_detail.cfm?article=tungsten.cfm (1162 words)

	Mineral Information Institute - TUNGSTEN
		Tungsten: Used in metalworking, construction and electrical machinery and equipment, in transportation equipment, as filament in lightbulbs, as a carbide in drilling equipment, in heat and radiation shielding, textile dyes, enamels, paints, and for coloring glass.
		Tungsten was discovered in 1758 by Axel Fredrik Cronstadt; in 1781 Carl Wilhelm Scheele isoldated a tungsten oxide, and in 1783 the Spanish chemists (and brothers) Fausto and Juan Jose de Elhuyar first separated tungsten from the mineral wolframite.
		Tungsten carbide is used to make cutting tools and wear-resistant tools for metalworking, drilling for oil and gas, mining, and construction.
	www.mii.org /Minerals/phototung.html (499 words)

	Review: Palm Tungsten C - infoSync World
		The Tungsten C is almost identical in form factor to the GSM/GPRS-based Tungsten W.
		The all-plastic case is a bit lighter in color than the Tungsten W, a light sliver-brown, and the external antenna of the Tungsten W is absent.
		The screen is the same standard size as the Tungsten W and Zire 71, and also uses the same eye-popping new screen technology as the Zire 71 for the brightest and richest display we've ever seen.
	www.infosyncworld.com /reviews/n/3479.html (0 words)

	Tungsten Properties
		Pure tungsten metal was first isolated by two Spanish chemists, the de Elhujar brothers in 1783.
		Tungsten is a greyish-white lustrous metal, which is a solid at room temperature.
		Tungsten has the highest melting point and lowest vapor pressure of all metals, and at temperatures over 1650°C has the highest tensile strength.
	www.tungsten.com /mtstung.html (179 words)

	Tungsten - An Overview
		Tungsten has the chemical symbol W and is element 74 of the periodic table.
		Tungsten features the lowest vapour pressure of all metals, very high moduli of compression and elasticity, very high thermal creep resistance, high thermal and electrical conductivity and, last but not least, a very high coefficient of electron emission.
		Although tungsten seems to be relatively harmless to the environment, environmental concerns have led to an increasing recycling rate, especially when the material contains other metals in addition to the tungsten.
	www.azom.com /details.asp?ArticleID=1201 (1702 words)

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