Merits and Drawbacks of Manufacturing Techniques of Tungsten Crucible

Tungsten crucible is an important deep-processing product of tungsten. As the main manufacturing techniques of tungsten crucible, isostatic pressing - sintering, forging, chemical vapor deposition, plasma spraying, a spinning and rivet linking and welding process have their own characteristics. Properties of tungsten crucible made by different manufacturing techniques also have some differences. The following is a brief analysis for merits and drawbacks of the six manufacturing techniques of tungsten crucible.

Isostatic pressing - sintering: Most of tungsten crucible are mainly made Isostatic pressing - sintering process. It has a high maturity because of a long history development. The main process of this manufacturing technique is pressing. Quality of the finished tungsten crucible made by isostatic pressing - sintering process is relatively stable. And it can produce large-size products. But it is easy to crack the bottom of tungsten crucible because the improper operation in the pressing process.

Forging: Forging is a key step of manufacturing techniques. The density of tungsten crucible made by this process is relatively high, therefore, anti-deformation and higher-temperature deformation resistance of such tungsten crucible are better than other types of tungsten crucible. However, forging process is finished by the processing of tungsten rod, so it has a lower utilization of materials. And the diameter of products made by forging is much small.

Chemical deposition process (CDV): With the continuous research and development of chemical deposition process in recent years, the maturity of it becomes much higher. The density of tungsten crucible made by this process is high, and it can produce the large size tungsten crucible with a thin wall. However, because of the short developed time, the maturity of the technology is not enough.

Plasma spraying forming: This process is capable of producing large size tungsten crucible. However, due to the size of the tungsten powder, internal organization of finished tungsten crucible is not tight enough, which will produce more pores, and result in density of tungsten crucible cannot reach a high standard.

Spinning: This process can produce high-density products. However, due to complexity of hot rolling process and the spinning process, it is difficult to operate.

Rivet linking and welding: Rivet linking and welding is capable of producing large size tungsten crucible products with thin wall. However, the metal welding process is the key step of rivet linking and strength of the metal junction is low.

Different manufacturing techniques have different advantages and disadvantages, the users should choose a different preparation process in according with the requirements of the finished tungsten crucible improve the quality and the rate of the finished products. 

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