Tungsten alloy is an alloy composed of tungsten as the base and other elements. Among metals, tungsten has a particularly high melting point, high temperature strength and creep resistance, as well as thermal conductivity, electrical conductivity and electron emission properties. It is used in the electronics and electric light source industries, and is also used in the aerospace, casting, weapons and other departments to make rocket nozzles, die-casting molds, armor-piercing cores, contacts, heating elements and heat shields.

Classification

Molybdenum Tungsten Alloy

Alloys containing molybdenum and tungsten include molybdenum-based molybdenum-tungsten alloys and tungsten-based tungsten-molybdenum alloys. This 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 based on 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 ductility-brittle transition temperature of the alloy will rise, and the grains will grow significantly. Therefore, in order to obtain a high-strength niobium-tungsten alloy, the amount of tungsten added must be properly controlled, and an appropriate amount of elements such as zirconium and hafnium that can refine grains and reduce the ductility-brittle transition temperature must be added. In 1961, the United States successfully developed Nb-10W-2.5Zr alloy for the skin of the space shuttle, and later developed into Nb-10W-1Zr-0.1C alloy. In the early 1970s, China also successfully developed NbWl0Zr2.5 and NbWl0Zr1C0.1 alloys.

Carbide

Cemented carbide is a very common, especially the main form of tungsten alloy, which is different from the previous tungsten alloys in that 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 the tungsten alloy of cemented carbide is also called "industrial teeth".