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The traditional processing method of molybdenum crucible

  • Mosten
  • 3 Jun

The high melting point and high strength of molybdenum make it difficult to process molybdenum dry pot. Early processing methods can be summarized as follows:

(1) Plasma spraying method. Spraying powder was prepared by ball milling and spray drying, and then the prepared powder was processed into molybdenum deposition layer with predetermined thickness by plasma spraying, and then the deposition layer was processed by hot isostatic pressing to produce the required products. The advantage of this preparation method is that the size of molybdenum crucible prepared will not be limited, and its mechanical properties can be guaranteed in the process of hot isostatic pressure, but this method is particularly wasteful of raw materials and expensive.

(2) Casting method. Molybdenum electrode was made and melted into liquid in a real shell furnace and then injected into the model. This method can complete the preparation of molybdenum crucible of various sizes, and saves the raw material compared with plasma spraying method. However, the preparation process is complex and a large number of molds need to be made. And the molybdenum melting point is high, melting needs to consume a lot of electricity.

(3) Stamping method. The molybdenum crucible was prepared by stamping process by using molybdenum slab's shape under heating condition. The material utilization rate of molybdenum crucible prepared by stamping method can reach 75%, which is relatively high, and the strength of molybdenum dry pot can be guaranteed to a certain extent. The disadvantage of the method is that it has a good effect for the crucible with large wall thickness, but it is difficult to realize the process for the crucible with large size and thin wall.

(4) Welding method. According to the required crucible size, the suitable molybdenum plate is obtained, the obtained plate is heated in the hydrogen aluminum wire furnace, the reel is taken out, the vacuum welding box is used to weld the tube seam and the copper bottom. This method has the advantages of low cost, simple production technology and suitable dimensional accuracy. However, it is easy to crack at the welding seam during the use of the welding crucible, which reduces the service life of the crucible. Therefore, it requires higher quality of the welding seam.

(5) Sintering method. Molybdenum and its alloy powder by isostatic pressing molding, machining and shaping, and then sintering. In this paper, molybdenum and its alloy crucible were prepared by sintering method. After trial and use, it was found that the properties and dimensional accuracy of the crucible were up to standard. At the same time, this method has a high utilization rate of raw materials. However, the crucible is prone to deformation in the process of sintering forming. The larger the crucible is, the thinner the wall thickness is, the more likely the deformation is to occur, which restricts the application of this method in the production of large-size thin-walled crucible. In addition, the existence of pores in the process of sintering molybdenum crucible will reduce the strength of molybdenum crucible and affect the use of molybdenum crucible.