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August 3, 2023
Classification and New Processing Technology of Molybdenum Crucible
Molybdenum metal has good high-temperature oxidation resistance and electrochemical corrosion resistance, and does not deform under high temperature conditions. It is an important high-temperature container in rare earth smelting furnaces and glass melting furnaces. Molybdenum crucibles can be widely used in metallurgy, vacuum spraying, alloy manufacturing, single crystal manufacturing, scientific experiments, high temperature resistant containers and glass ceramics and other industries. According to the crucible manufacturing process, it is generally divided into pressed sintered crucible and spinning crucible. Among them, the pressed sintered crucible has low quality, low purity and density, relatively short service life and relatively cheap price. The spinning crucible has high quality, high purity and density, long service life and high price.
Molybdenum Crucible Picture:
With the development of LED lighting industry, the demand for sapphire is getting higher and higher. As a consumable in the production process of sapphire, the demand for molybdenum crucible is also getting higher and higher. The strength and service life of the molybdenum crucible will be affected in the traditional sintering process, so it is necessary to study new crucible manufacturing processes, such as spinning process and 3D printing technology.
1. Spinning process
Spinning is an advanced process that combines forging, extrusion, stretching, bending, ring rolling and rolling. It mainly uses the feed motion of the spinning wheel to apply pressure to the metal blank that is rotated by the main shaft of the machine. The metal blank produces continuous local plastic deformation, and finally the required hollow rotary parts are obtained.
Its processing advantages are: high dimensional accuracy and surface finish can be achieved; high material utilization rate and cost saving. However, this process still has certain technical difficulties. For example, due to the influence of temperature, the possibility of brittle fracture is very high, and it is difficult to accurately control the influence of various process parameters on the performance and dimensional accuracy of the prepared molybdenum crucible.
2. 3D printing technology
The technology is based on a three-dimensional digital model and typically combines materials using layer-by-layer manufacturing. The method of selective laser sintering can be used in the manufacture of molybdenum crucibles. The prepared mixed powder of molybdenum and binder is sintered in layers according to the size of the crucible with a laser, and finally shaped into a crucible shape.
The advantages of this processing technology are: high raw material utilization rate, cost saving, few processing steps and short time. but. The high melting point and high strength of molybdenum and the bubbles produced by the binder during the sintering process will affect the dimensional accuracy of the crucible, which is also a technical difficulty that needs to be further overcome.