Chemical products of tungsten
At present, about 50% of the tungsten ore produced in the world is used for smelting high-quality steel, about 35% for hard steel production, about 10% for tungsten filaments, and 5% for other purposes. Tungsten can make guns, rocket propeller nozzles, cutting metal blades, bits, superhard dies, drawing dies, and so on. Tungsten rod is widely used for mining, metallurgy, machinery, construction, transportation, electronics, chemical industry, light industry, textile, military industry, aerospace, science and technology, and various industrial fields. Chemical products include tungsten carbide base hard alloy, heat resistant and wear resistant alloy contact material, and the high proportion alloy, vacuum electric lighting materials and a variety of tungsten compounds. Among them, pure tungsten, tungsten alloy and tungsten copper alloy are the most important tungsten chemicals.
Tungsten has three kinds of processing means: forging, stretching and impacting. In all the metal in the highest melting point of 3415 DEG C, the steam pressure, the lowest, the highest tensile strength. The anticorrosion performance is very good, and most inorganic acids can only cause small erosion. In the air, the surface of pure tungsten forms a layer of protective oxide, but it will be completely oxidized at high temperature. The addition of a small amount of tungsten in steel can greatly improve the hardness of the steel. High purity tungsten is pure tungsten with a purity of 99.999% and 99.9999%, recorded as 5N and 6N.
Tungsten alloy
Tungsten alloy is an alloy consisting of other elements based on tungsten. In the metal, tungsten the highest melting point, high temperature strength and creep resistance, thermal conductivity and electron emission performance are good, than the major, except for the manufacture of a large number of hard alloy and alloy additives, tungsten and tungsten alloys are widely used in electronics, electric light industry, but also in aerospace, weapons, and other departments in casting for the production of rocket nozzle, die casting mould, penetrator, contact, heating and heat insulation screen etc..
Tungsten copper
Tungsten copper is an alloy of tungsten and copper, and the copper content of tungsten copper alloys is 10% ~ 50%. Tungsten copper alloy is made by powder metallurgy. It has good conductive and thermal conductivity, good high-temperature strength and certain plasticity. At a very high temperature, such as over 3000 C, the copper in the tungsten copper alloy is liquefied and evaporated, which absorbs a large amount of heat and reduces the surface temperature of the material. So this kind of material is also known as a metal perspiration. Tungsten copper alloy is widely used, is mainly used for the manufacture of high voltage electrical switch anti arc erosion of contact and the rocket nozzle throat and tail rudder and other high-temperature components, machining, EDM electrode is used for high-temperature mold and other occasions at high temperature and thermal conductivity properties.
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