Properties of Tungsten
Pure undoped tungsten and VM tungsten have similar physical properties.
Many practical applications of tungsten are based on its high melting point and low vapour pressure.
Tungsten not only has the highest melting point but also the lowest vapour pressure of all metals. Hence, tungsten is an excellent material for high-vacuum technology and related applications at the highest temperatures.
The low thermal expansion combined with its high melting point and great dimensional stability at high temperatures make tungsten a highly suitable material for glass seals. The thermal expansion coefficient of tungsten increases only slightly with rising temperature.
The electrical resistance characteristics of tungsten are important for its use in high-temperature furnace construction. Compared with other heating element materials, the specific resistance of tungsten is relatively low but increases with temperature.
Owing to its high density, tungsten has a high absorption capacity for radioactive radiation. A disadvantage of pure tungsten is that it is difficult to machine. Therefore, absorption material for X-rays and gamma rays are made of tungsten alloys of high tungsten content with a nickel-iron or a nickel-copper binder phase, which can then be readily machined.
Zhengzhou Sanhui Co., Ltd has been dealing in refractory metals for almost 25 years. We are one Alibaba 10-year golden supplier. Come to us for titanium, niobium, nickel and other metals.
Many practical applications of tungsten are based on its high melting point and low vapour pressure.
Tungsten not only has the highest melting point but also the lowest vapour pressure of all metals. Hence, tungsten is an excellent material for high-vacuum technology and related applications at the highest temperatures.
The low thermal expansion combined with its high melting point and great dimensional stability at high temperatures make tungsten a highly suitable material for glass seals. The thermal expansion coefficient of tungsten increases only slightly with rising temperature.
The electrical resistance characteristics of tungsten are important for its use in high-temperature furnace construction. Compared with other heating element materials, the specific resistance of tungsten is relatively low but increases with temperature.
Owing to its high density, tungsten has a high absorption capacity for radioactive radiation. A disadvantage of pure tungsten is that it is difficult to machine. Therefore, absorption material for X-rays and gamma rays are made of tungsten alloys of high tungsten content with a nickel-iron or a nickel-copper binder phase, which can then be readily machined.
Zhengzhou Sanhui Co., Ltd has been dealing in refractory metals for almost 25 years. We are one Alibaba 10-year golden supplier. Come to us for titanium, niobium, nickel and other metals.
