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Tungsten Is A Metal Element
Aug 22, 2017

Tungsten, a metal element. Atomic number 74, atomic weight 183.84. Steel gray or silver white, high hardness, high melting point, at room temperature from air erosion; the main purpose for the manufacture of filament and high-speed cutting alloy steel, super-hard mold, also used for optical instruments, chemical equipment. China is the world's largest tungsten storage country.

Tungsten is a metal element. The chemical element of tungsten is W, the atomic number is 74, the relative atomic mass is 183.85, the atomic radius is 137 dm, the density is 19.35 g / cm3 and belongs to the sixth cycle (second long period) of the periodic table VIB family. Tungsten in the nature of the main hexavalent cation, the ion radius of 0.68 × 10-10m. As the W6 + ion radius is small, the price is high, the polarization ability is strong, easy to form the network anion, so the tungsten mainly in the form of anion [WO4] 2-, with the solution of Fe2 +, Mn2 +, Ca2 + and other cations to form wolframite or white Tungsten ore precipitation. After smelting tungsten is silver and shiny metal, melting point is very high, hardness is very large, low vapor pressure, evaporation speed is also small, the chemical properties are relatively stable.

Nonferrous metals

Tungsten is a nonferrous metal. Usually people according to the color and nature of metal metal into two categories: ferrous metals and non-ferrous metals. Black metal mainly refers to iron, manganese, chromium and its alloys, such as steel, pig iron, ferroalloy, cast iron and so on. Ferrous metals other than metal are called non-ferrous metals. Tungsten belongs to the category of nonferrous metals. The strength and hardness of non-ferrous alloys are generally higher than pure metal, the resistance is larger than pure metal, the resistance temperature coefficient is small, has good comprehensive mechanical performance. Thus, as a nonferrous metal, tungsten has a very high strength and hardness. Because of this feature, with a high hardness, wear resistance of tungsten carbide is a large-scale application of cutting tools, mining tools.

Refractory metal

Tungsten is the most refractory refractory metal. Generally, the metal with a certain melting point above 1650 ° C and the melting point above the melting point of zinc (1852 ° C) is called refractory metal. Typical refractory metals are tungsten, tantalum, molybdenum, niobium, hafnium, chromium, vanadium, zirconium and titanium. As a refractory metal, tungsten is the most important advantage is a good high temperature strength, the molten alkali metal and steam have good corrosion resistance, tungsten only at 1000 ℃ above only oxide evaporation and liquid oxide. However, it also has a plastic - brittle transition temperature is higher, at room temperature is difficult to plastic processing shortcomings. Tungsten as the representative of the refractory metal in the metallurgical, chemical, electronics, light, machinery and other sectors have been widely used.

Rare metal

Tungsten is a rare metal. Rare metals usually refer to metals that are less or less dispersed in nature. Tungsten is a widely distributed element, almost all over the various types of rocks, but the content is low. The content of tungsten in the crust is 0.001%, and the average content of granite is 1.5 × 10-6. This characteristic leads to the difficulty of extraction. It is usually only separated by organic solvent extraction and ion exchange. With the development of science and technology and the development of metallurgical technology, equipment and analysis and detection technology and the expansion of rare metal production scale, the purity of tungsten is improved, the performance is improved continuously and the variety is increasing, thus expanding the application field of tungsten. China's tungsten ore is rich in resources, tungsten production and export volume accounted for the world's first.

Strategic metal

Tungsten is a strategic metal. It is well known that rare metals are an important strategic resource for the country, and tungsten is a typical rare metal and has a very important use. It is an important part of contemporary high-tech new materials, a series of electronic optical materials, special alloys, new functional materials and organometallic compounds are required to use a unique performance of tungsten. Although the amount is not big, but crucial, lack it can not. And thus widely used in contemporary communications technology, electronic computers, aerospace development, medicine and health, photographic materials, optoelectronic materials, energy materials and catalyst materials

Basic use: the world's mined tungsten ore, about 50% for high-quality steel smelting, about 35% for the production of hard steel, about 10% for tungsten filament, about 5% for other purposes. Tungsten can be used to manufacture firearms, rocket propeller nozzles, armor piercing, cutting metal blades, drill bits, superhard molds, drawing dies, etc., the use of tungsten is very wide, involving mining, metallurgy, machinery, construction, transportation, electronics, Light industry, textile, military, aerospace, science and technology, various industrial fields.

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