tung·sten (tŭng′stən) n. Symbol W A hard, brittle, corrosion-resistant, gray to white metallic element extracted from wolframite, scheelite, and other minerals, having the highest melting point and lowest vapor pressure of any metal. Tungsten and its alloys are used in high-temperature structural materials and wear-resistant tools and machine parts ...

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TUNGSTEN [[[symbol]] W, atomic weight 184o (0=16)], a metallic chemical element found in the minerals wolfram, an iron and manganese tungstate, scheelite, a calcium tungstate, stolzite, a lead tungstate, and in some rarer minerals. Its presence in scheelite was detected by Scheele and Bergman in 1781, and in 1783 Juan, Jose and d'Elhuyar showed the same substance occurred in wolfram; they also ...

Tungsten definition, a rare, metallic element having a bright-gray color, a metallic luster, and a high melting point, 3410° C, and found in wolframite, tungstite ...

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A tungsten tip is subjected to microwave plasma-enhanced chemical vapor deposition. The process fabricates a carbon nanotube (CNT) directly on it as shown in Fig. 4.25.The reduction of the density of plasma ions directed to the apex of the tungsten tip suppresses the sputtering effect, and makes a successful fabrication of CNT tip.

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Tungsten, chemical element that is an exceptionally strong metal. Occurrence, properties, and uses. The amount of tungsten in Earth’s crust is estimated to be 1.5 parts per million, or about 1.5 grams per ton of rock. China is the dominant producer of tungsten; in 2016 it produced over 80 percent of total tungsten mined, and it contained nearly two-thirds of the world’s reserves.

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Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. The name tungsten comes from the former Swedish name for the tungstate mineral scheelite, tungsten which means "heavy stone". Tungsten is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. It was identified as a new element in 1781 …

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tungsten meaning: 1. a chemical element that is a hard metal used in making light bulbs and strong types of steel…. Learn more.

May 13, 2019· Tungsten is a very dense, corrosion-resistant metal that is almost impossible to melt. In fact, tungsten has the highest melting point of all metals. Tungsten exhibits other important physical properties as well, including good thermal

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Jun 21, 2018· Directed by Heitor Dhalia. With Jamile Alves, Juarez Alves, Samira Carvalho Bento, Fabrício Boliveira. Tungsten will bring four characters to the center of a narrative built like a precision mechanism: a police officer that acts moved by his instincts; his wife, whose decision to get a divorce from him seems irrevocable; a small drug dealer, whose main interest is to survive another day; and ...