Classifications of Tungsten Crucible

As a kind of tungsten metal products, tungsten crucible has some very excellent properties, such as a high melting point, a high boiling point, a strong anti-friction resistance and the coefficient of thermal expansion is very small. Nowadays, tungsten crucible is widely used in rare earth smelting, quartz glass, electronic spraying and other industries because of those excellent properties. Moreover, China is the most resource-rich countries of tungsten in the world. Therefore, the related applications of tungsten crucible have also been rapid development. According to the manufacturing process of the tungsten crucible, it can be mainly divided into two types: forging type and sintering type. The two types will be briefly described in the next part.

Forging Tungsten Crucible: Forging process is a manufacturing process which can make metal billet become plastic deformation by using localized compressive forces to obtain the forging parts with a mechanical energy, and a relatively shape and size. The raw material of forging tungsten crucible is a solid tungsten rod. After processing of the lathe system, then tungsten crucible can be produced. The advantage of the forging tungsten crucible is a high density. What’s more, it is not susceptible to be corroded with a longer life time.

Sintering tungsten crucible: It refers to a conventional sintering process which would make powdery raw materials into the dense bodies. The raw material of sintering tungsten crucible is tungsten powder. After firing the molding, sintering tungsten crucible would be produced by lathe working. Sintering tungsten crucible can be characterized by the production of large-size of tungsten crucible.

Tungsten crucible has a high temperature oxidation resistance and resistance and a strong electrochemical corrosion resistance, so it is a relatively good material for high temperature supporting. Although there are many advantages of forging tungsten crucible and sintering tungsten crucible, there still exist some serious problems. For example, during the sintering process of the sintering tungsten crucible, agglomerate cannot deliver the heat to the blast furnace because of the high temperature. Even if people can recover the part of the waste heat, sintering processing still release a large amount of waste heat. It would have a great effect in ecological environment. In terms of the environment, people should know more about the recovery details of it to improve the development of tungsten industry.

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