Applications of tungsten
The melting point of tungsten is the highest of all metal elements, the density is high, and is close to the gold, the hardness of tungsten is also very high, the hardness of tungsten carbide is close to diamond. In addition, tungsten also has good electrical conductivity and thermal conductivity, low coefficient, which is widely used in alloy, electronics, chemical industry.
The hardness of tungsten is very high and close to gold, so it can improve the strength, hardness and wear resistance of the steel, is an important alloying element, is widely used in all kinds of steel production, common tungsten steel are high-speed steel, tungsten steel and tungsten cobalt magnetic steel, the steel is mainly used in the manufacture of various tools such as drills, milling cutter, wire drawing die, die and mold etc..
Tungsten is widely used in electronics and power industry because of its high plasticity, low evaporation rate, high melting point and high electron emission ability. For example,with the high light rate and long service life, so tungsten is widely used in the manufacture of various bulb filament, such as incandescent lamps, halogen lamps, tungsten wire can also be used in the manufacture of electronic tubes direct hot cathode, gate and a variety of electronic instruments by hot cathode heater. The properties of tungsten make it suitable for use in TIG welding and other similar materials.
The compound of tungsten is used as catalyst, and inorganic color, such as the two tungsten sulfide used as lubricant and catalyst in the synthesis of gasoline, tungsten oxide was used in painting, calcium or magnesium tungsten was used in fluorescent powder.
Because its thermal expansion is similar to that of borosilicate glass, it is used to make glass or metal seals. The sensitivity of tungsten is low, so it is used to produce high purity tungsten jewelry. In addition, tungsten was also used in radioactive medicine, some instruments will also use tungsten wire.