Tungsten alloy is an alloy based on tungsten and added with other elements. Among metals, tungsten has the highest melting point, high-temperature strength, creep resistance, thermal conductivity, electrical conductivity and electron emission performance. In addition to a large number of cemented carbide and alloy additives, tungsten and its alloys are widely used in electronic and electric light source industries, as well as in aerospace, casting, weapons and other departments for making rocket nozzle, die-casting mold, armor piercing bullet core, contact, heater and heat shield.
Tungsten alloy
According to different uses, tungsten alloys are divided into cemented carbide, high specific gravity alloy, metal sweating material, contact material, electronic and electric light source material.
Classification of tungsten alloys:
Molybdenum tungsten alloy
The alloy containing molybdenum and tungsten includes molybdenum based molybdenum tungsten alloy and tungsten based tungsten molybdenum alloy series. The alloy can be formed in any proportion and is a complete solid solution alloy at all temperatures.
Niobium tungsten alloy
A niobium alloy formed by adding a certain amount of tungsten and other elements to niobium. Tungsten and niobium form an infinite solid solution. Tungsten is an effective strengthening element of niobium, but with the increase of tungsten addition, the plastic brittle transition temperature of the alloy will rise and the grain will grow significantly. Therefore, in order to obtain high strength niobium tungsten alloy, the addition amount of tungsten must be properly controlled, and an appropriate amount of elements such as zirconium and hafnium that refine grains and reduce the plastic brittle transition temperature must be added.
Cemented carbide
Cemented carbide is a common and main form of tungsten alloy. Different from the previous tungsten alloys, it is tungsten, carbon and cobalt, so it is also often called tungsten cobalt alloy. At present, the tools widely used in the industrial field are basically cemented carbide tools, so cemented carbide tungsten alloy is also known as "industrial teeth".
