Tungsten alloy
Tungsten alloys are alloys based on tungsten and made of other elements. Among metals, tungsten has the highest melting point, good high temperature strength and creep resistance, as well as good thermal conductivity, electrical conductivity and electron emission properties. In addition to being widely used in the manufacture of hard alloys and as alloy additives, tungsten and its alloys are widely used in the electronics and electric light source industries. It is also used in aerospace, casting, weapons and other sectors to make rocket nozzle, die casting mold, armor-piercing core, contact, heating body and heat shield, etc.
An alloy based on tungsten and supplemented with other elements. Among metals, tungsten has the highest melting point, good high temperature strength, creep resistance, thermal conductivity, electrical conductivity and electron emission properties, and has a significant ratio, except that it is used in large quantities to produce hard gold and as an additive for gold corruption: G and its gold corruption are widely used in Shi Shi and olfactory light source industries. It is also used to make rocket nozzles, die casting molds, armor-piercing shells, contacts, heating bodies and heat shield in aerospace, chain manufacturing, weapons and other departments.
Tungsten was first used to make incandescent filaments. In 1909, tungsten wire was made by tungsten powder pressing, remelting, spinning forging and wire drawing. Since then, tungsten wire production has developed rapidly. In 1913, it was discovered that the electron emission performance of tungsten needle wire (also called male tungsten wire) was better than that of pure tungsten wire. Tungsten needle wire was used and is still widely used today. In 1922, tungsten wires with excellent anti-droop properties (called doped tungsten wires or non-droop tungsten wires) were developed, which was a major progress in tungsten wire research. Non - pendulous tungsten filament is widely used as excellent filament and cathode material. In the 1950s and 1960s, extensive exploration and research were carried out on tungsten alloy, hoping to develop tungsten alloy which can work at 1930 ~ 2760℃ for making high temperature resistant parts used in aerospace industry. Among them, tungsten-baht alloy has been studied more. Tungsten smelting and forming technology has also been studied. Tungsten ingots are obtained by consumable arc and electron beam melting, and some products are made by extrusion and plastic processing. However, due to the coarse grain size, poor plasticity, difficult processing and low yield, smelting - plastic processing technology has not become the main means of production. Except chemical vapor deposition (CVD) and plasma spraying which can produce very few products, powder metallurgy is still the main means of tungsten production.
China could produce tungsten wire in the 1950s. In the 1960s, tungsten smelting, powder metallurgy and processing technology has been studied, and now we can produce tungsten sheet, tungsten foil, tungsten bar, tungsten pipe, tungsten wire and other special-shaped pieces.
