Uses of tungsten

Details: Category: Tungsten Information; Published on Monday, 15 September 2014 16:21; Written by jwy; Hits: 1689

In 1781, Carl Wilhelm Scheele discovered that a new acid could be made from a substance now called scheelite. Two years later, brothers José and Fausto Elhuyar isolated tungsten, and they are credited with discovering the element.

Tungsten naturally occurs in the minerals wolframite, scheelite, huebnertie and ferberite. China may have about 75 percent of the world's tungsten resources and other deposits are located in California, Colorado, South Korea, Bolivia, Russia and Portugal. The metal is typically obtained by reducing tungsten oxide with hydrogen or carbon.

Tungsten is very commonly used to make filaments for electric lamps, in electron and television tubes, and for metal evaporation work. It’s also applied to electrical contact points for automobile distributors; X-ray targets; windings and heating elements for electrical furnaces; and in several spacecraft and high-temperature applications. Alloys that make high-speed tool steels, such as Hastelloy and Stellite, contain tungsten.

The metal is useful for glass-to-metal seals. Its carbides, bronzes and disulfides are used in several applications including paints and as a lubricant. Calcium and magnesium tungstates are widely used in fluorescent lighting while other tungsten salts are used in the chemical and tanning industries.

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