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 .