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 .

According to the characteristics of materials, the application of different processing material W and the preparation method of the case

According to the characteristics of tungsten materials, processing materials , different applications have traditionally divided into three categories of cases and preparation methods : ① pure tungsten and tungsten alloy products in the usual sense , including pure tungsten, doped tungsten, tungsten male , ornaments tungsten and tungsten alloys Lai , whose main products are wire and rods . This is the largest tungsten processing timber species and number of a class of products . ② The second category is a high -density tungsten alloy , mainly of tungsten and tungsten nickel-copper- nickel- iron two series , its application is the use of its high density and high strength properties. ③ The third category is tungsten, copper,  tungsten carbide plate  material, particularly tungsten, copper materials, processing materials are tungsten relatively small amount of a class of article , however , there is considerable development in recent years . In recent decades , tungsten copper material , whether done a lot of work from the application, production and  tungsten balls  , and has made many significant progress : Before the 1960s , most of the products are as high tungsten copper , medium voltage electrical switch electrical contacts using a small amount used for resistance welding electrodes ; 60 to the beginning of the last century, the 1970s , the development of EDM , because tungsten copper material excellent resistance to spark erosion effect , and gradually began to be used as electrical spark electrode material processing machine , to the last century, 80 to 90 years , widening their application and mature , a significant amount of growth in the application ;

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.