The melting point of Tungsten is the highest of all metal elements, the density (19.3 g / cm³) is very high, close to gold, tungsten hardness is also high, such as tungsten carbide hardness and diamond close. In addition, tungsten also has good electrical conductivity and thermal conductivity, a small coefficient of expansion and other characteristics, which is widely used in alloys, electronics, chemicals and other fields, of which tungsten carbide is the largest consumer of tungsten.
Tungsten Alloy application overview
Tungsten steel cutter tungsten hardness is very high, tungsten density close to gold, which can improve the strength of steel, hardness and wear resistance, is an important alloying elements, is widely used in a variety of steel production, common Tungsten steel and tungsten and tungsten steel with high magnetization and coercive force. These steels are mainly used in the manufacture of various tools such as drill bits, milling cutters, drawing dies, female molds and male molds Wait.
Tungsten carbide has high abrasion resistance and refractibility, its hardness is close to the diamond, which is often used in some cemented carbide. At present, tungsten carbide based carbide is the largest consumption area of tungsten, this carbide is the tungsten carbide micron powder and metal adhesives (such as cobalt, nickel, molybdenum) in a vacuum furnace or hydrogen reduction furnace sintering Of the powder metallurgy products. Tungsten carbide - titanium carbide - tantalum carbide (niobium) - cobalt and steel bonded carbide and other four categories, the carbonation of tungsten carbide - titanium carbide - titanium carbide - titanium carbide - titanium carbide - titanium carbide - Tungsten based carbide is mainly used in the manufacture of cutting tools, mining tools and drawing die.
Heat and wear resistant alloys
Whirlpool impeller tungsten is the highest melting point of all metals, hardness is also very high, which is often used to produce heat and wear-resistant alloys, such as tungsten and chromium, cobalt, carbon alloy commonly used to produce such as aero engine valves, Turbines and other refractory parts, and tungsten and other refractory metals (such as tantalum, niobium, molybdenum, rhenium) alloy often produce such as aviation rocket nozzles, engines and other high-heat strength parts.
High specific gravity alloy
Because of the high density and high hardness of tungsten, oil is the ideal material for making high specific gravity alloy. These high specific gravity alloys are classified into W-Ni-Fe, W-Ni-Cu, W-Co, W according to composition characteristics and uses -WC-Cu, W-Ag and other major series, such alloys have a greater than the major, high strength, strong ability to absorb radiation, thermal conductivity, thermal expansion coefficient is small, good electrical conductivity, solderability and good processing properties, Widely used in aerospace, aviation, military, oil drilling, electrical instrumentation, medical and other industries, such as manufacturing armor, heat sink, control rudder balance hammer and such as knife switch, circuit breakers, spot welding electrodes and other contact materials.
Incandescent tungsten has a strong plasticity, low evaporation rate, high melting point, strong electron emission capability, and tungsten and its alloys are widely used in the electronics and power industry. For example, tungsten filament has high luminous efficiency and long service life, and is widely used in the manufacture of various bulb filament, such as incandescent lamp, iodine tungsten lamp and so on. Tungsten wire can also be used to make the direct thermal cathode and gate of electronic oscillation tube As well as a variety of electronic equipment in the side of the hot cathode heater. The characteristics of tungsten make it also suitable for use in TIG welding and other electrode materials similar to this work.
Tungsten compounds are often used as catalysts and inorganic colors, such as tungsten disulfide used in the preparation of synthetic gasoline as a lubricant and catalyst, bronze tungsten oxide used in painting, calcium or magnesium tungsten commonly used in the phosphor.
Since the thermal expansion of tungsten is similar to borosilicate glass, it is used for glass or metal sealing. Tungsten is low in sensitivity and is therefore used to make high purity tungsten gold jewelery. In addition, tungsten is also used in radioactive medicine, and some instruments will use tungsten wire.
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