Manufacturing Techniques of Tungsten Crucible: Plasma Spraying, Chemical Vapor Deposition, Rivet Linking and Welding

Plasma spraying process: First of all, users should prepare a suitable graphite mandrel for finished tungsten crucible product, and then fixed it on an airtight turntable. When sealed housing is in a vacuum condition, and then adds argon with a high purity. After spraying the surface of graphite mandrel by plasma spraying equipment, spraying it until the size and the quality can meet the design requirement. And it is time to cool it. Finally, tungsten crucible can be formed by machining process.

Chemical vapor deposition (CVD): It is a chemical process used to produce high quality, high-performance, solid materials. The process is often used in the semiconductor industry to produce thin films. If people want to use this way to produce tungsten crucible, the main raw materials are tungsten hexafluoride and hydrogen. Both of them can be oxidized into vapor deposition of tungsten atoms. After that, there exist settled player of tungsten on surface of matrix. Until the settled player increase to a certain degree, basic shape of tungsten crucible is formed. Finally, a finished tungsten crucible will be produced by the treatment process and annealing process.

Rivet linking and welding process: This process includes rivet linking and welding. Rivet linking refers to two or more metals are linked by rivets, and people often use rivet to link two tungsten plates. Welding is a manufacturing or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal. Use this way to produce the tungsten crucible, the first step is to make tungsten plates into tungsten tube. And then, link it with a round tungsten plate to produce the finished tungsten crucible.

Tungsten crucible belongs to the deep processing of tungsten products and it has a very high added value. Therefore, many researchers are working on manufacturing techniques of tungsten crucible. So far, manufacturing techniques of tungsten crucible have been widely used in various products. The most common process is isostatic - sintering process, forging and Rivet linking and welding process. Manufacturing techniques of the three processes are more mature, and quality and stability of production are better by using the three process.

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