Department of tungsten and molybdenum from the melting point, high hardness of the metal tungsten

Department of tungsten and molybdenum materials different from each other by a high melting point, tungsten high hardness and high ductility , high conductivity copper metal composed of a two-phase composite material dissolved . It combines the respective properties of tungsten and copper , such as high temperature strength , high electrical and thermal conductivity , good resistance to galvanic corrosion resistance, high hardness, low thermal expansion coefficient and a certain plasticity . Further, by changing the composition ratio , control and adjust its respective  tungsten carbide rods  mechanical and physical properties. In addition , it has a new combination of properties due to the generation of both , as it is under high temperature conditions due to the cooling effect of evaporation from the copper contained in the endothermic generated . Therefore , it can be widely used in aerospace , electronics, machinery , electrical and other industrial sectors , especially in some high-tech fields. Tungsten copper material appeared since the 1930s of the last century , in a long time mainly used all kinds of  tungsten electrode  switch electrical contacts . Precisely because of its high strength and low withstand voltage electrical ablation performance , so as to promote the continuous improvement of high-voltage electrical switch voltage levels and use the power of their use, and high-voltage electrical switches become indispensable key material . To the sixties of the last century before , tungsten copper material and gradually as the electric resistance welding and machining of electrodes and space technology as contact with hot gas began to use high-temperature materials .

Tungsten and tungsten silver material, like copper material, but also a fake alloy

Tungsten and silver materials composed of two elements. Tungsten and tungsten silver material, like copper material, but also a fake alloy, its preparation method and tungsten copper materials similar. Tungsten silver conductive materials, thermal conductivity than copper tungsten material is good, other properties similar.  sandblasted tungsten target  silver material made ​​of copper materials are simultaneously used as electrical switches and contacts (contacts) in the 1930s. The late 1950s, the development of  tungsten electrode  rockets, gas temperature and pressure greatly improved, pure tungsten rocket nozzle can not meet the original use of such conditions, when other materials can not meet the requirements.