General application of tungsten

Tungsten has the highest melting point of any metal element, a high density (19.3 g/cm cubed) and is close to gold. In addition, tungsten also has good electrical and thermal conductivity, small expansion coefficient and other characteristics, so it is widely used in alloy, electronics, chemical and other fields, among which cemented carbide is the largest consumption area of tungsten.

Alloy field

Iron and steel Tungsten steel milling cutter tungsten hardness is high, the density of tungsten is close to gold, and thus can improve the strength of steel, hardness and wear resistance, is one of the important alloy elements, are widely used in various kinds of steel production, common containing tungsten steel has high speed steel, tungsten steel, and has high magnetization and coercive force of tungsten cobalt magnetic steel, etc., these steel products mainly used in the manufacture of a variety of tools, like drill bits, milling cutter, wire drawing die and female die and male die, etc. Tungsten carbide base carbide Tungsten carbide has high wear resistance and refractory, its hardness is close to diamond, so it is often used in some hard alloys. At present, tungsten carbide is the largest consumption area of tungsten. This kind of carbide is powder metallurgy products made by sintering tungsten carbide micron powder and metal binder (such as cobalt, nickel and molybdenum) in vacuum furnace or hydrogen reduction furnace. Tungsten carbide base carbide is generally divided into four categories: tungsten carbide -- cobalt, tungsten carbide -- titanium carbide -- cobalt, tungsten carbide -- titanium carbide -- tantalum carbide (niobium) -- cobalt and steel-bonded carbide. These tungsten carbide base carbide alloys are mainly used for manufacturing cutting tools, mining tools and wire drawing dies.

Tungsten carbide base carbide

Tungsten carbide has high wear resistance and refractory, its hardness is close to diamond, so it is often used in some hard alloys. At present, tungsten carbide is the largest consumption area of tungsten. This kind of carbide is powder metallurgy products made by sintering tungsten carbide micron powder and metal binder (such as cobalt, nickel and molybdenum) in vacuum furnace or hydrogen reduction furnace. Tungsten carbide base carbide is generally divided into four categories: tungsten carbide -- cobalt, tungsten carbide -- titanium carbide -- cobalt, tungsten carbide -- titanium carbide -- tantalum carbide (niobium) -- cobalt and steel-bonded carbide. These tungsten carbide base carbide alloys are mainly used for manufacturing cutting tools, mining tools and wire drawing dies.

Hot strength and wear resistant alloy Turbines impeller tungsten melting point is the highest of all metal, hardness is high, which is often used to produce heat and wear-resistant alloys, such as carbon and chromium, cobalt, tungsten alloy are commonly used to production such as aircraft engine valve, turbine wheel, such as high-strength wear-resistant parts, tungsten and other refractory metal (such as tantalum, niobium, molybdenum and rhenium) alloy used to produce high strength such as aircraft rocket nozzle, engine parts.

High density alloy

Oil drilling due to the high density of tungsten, high hardness, thus became an ideal material for high proportion alloy, the high proportion alloy composition features and USES are divided into W - Ni - Fe - Ni - Cu, W, W - Co - WC - Cu, W, W - Ag and other major series, this kind of alloy has better than big, high strength, strong ability to absorb radiation, coefficient of thermal conductivity, thermal expansion coefficient, good conductivity, good weldability and workability characteristics, widely used in aerospace, aviation, military, oil drilling, electrical instrumentation, medical and other industries, Such as the manufacture of armor, radiator fin, rudder control balance hammer and such as knife switches, circuit breakers, spot welding electrodes and other contact materials.

Electronics field

Due to its plasticity, low evaporation rate, high melting point and strong electron emission capacity, tungsten and its alloys are widely used in the electronic and power industry. For example, the luminous rate of tungsten wire is high, the service life is long, so it is widely used in the manufacture of all kinds of lamp filament, such as incandescent lamp, iodine tungsten lamp, tungsten wire can also be used in the manufacture of electronic oscillating tube direct hot cathode and grid as well as a variety of electronic instruments in the side hot cathode heater. The properties of tungsten make it ideal for TIG welding and other electrode materials that work like this.

Field of chemical industry

Tungsten compounds are commonly used as catalysts and inorganic colors. For example, tungsten disulfide is used as a lubricant and catalyst in the preparation of synthetic gasoline, bronze tungsten oxide is used in painting, and calcium or magnesium tungsten is used in phosphors.

In other areas

Because its thermal expansion is similar to that of borosilicate glass, tungsten is used to seal glass or metal. Due to its low sensitivity, tungsten is used to make high purity tungsten gold jewelry. Tungsten is also used in radiological medicine, and some Musical Instruments use tungsten wires.