Applications of Tungsten Crucible

The main raw material of tungsten crucible is tungsten, and it is mainly formed through the deep processing of tungsten. Thanks to the high melting point and boiling point, a good thermal conductivity, low thermal expansion coefficient, a strong abrasion and corrosion resistance and other excellent properties of tungsten, tungsten crucible is widely applied in smelting of rare earth, quartz glass and crystal growth industries.

As an important member in the smelting of rare earth, functional performance and life time of tungsten crucible is very important. In the past, smelting of rare earth mainly use crucible which is welded by tungsten, molybdenum, or tantalum slab. But because there are many problems of this kind of crucible which would have seriously impact on their life time. The problems of welded crucible are more serious for high temperature or high purity rare earth metals. welding production out of the crucible short life is even more obvious. To solve this problem, the researchers developed a sintered tungsten crucible which can deal with the problem of crack of welding process. Sintered tungsten crucible has a high density, a high purity, long life time and other properties which make the rare earth smelting industry pay more attention to it. Compared with other types of crucibles, on the one hand, tungsten crucible would produce less pollution when smelting metal. On the other hand, its life time is longer, so the tungsten crucible is widely applied in rare earth industry.

Because of the melting point of tungsten can reach 3600℃, tungsten crucible can be considered as the cord cage and widely applied to the furnace of sapphire products. And the temperature tungsten crucible is generally above 2000 ℃ while working. Especially for sapphire products furnace, characteristics of a high purity, high density, crack-free, precise size, smooth inner and outer walls of the tungsten crucible can greatly improves the success rate of seed of the growth of sapphire crystal. In addition, tungsten crucible also plays a key role in controlling the quality of crystal pulling and the life time of sapphire products.

Quartz glass is an amorphous material which is only made of silica. The raw materials of it are crystal, silica and silicide, and quartz glass can be formed by high temperature melting or chemical vapor deposition. Therefore, it need for a high melting point and boiling point tungsten crucible as the core cage. In addition, the tungsten crucible can also greatly improve the rate of finished quartz glass.

• < Prev
• Next >