Molybdenum News Center

In recent years, powder sintering technique after another. Field activated sintering (FAST) is generated by applying a low voltage (~ 30V) and high current (> 600A) of the electric field during the sintering process, and the DC pulse discharge to achieve the same time, to achieve the electric field activated sintering, to obtain a significant refinement of microstructure , significantly lower the sintering temperature, sintering time is shortened purposes. Selective Laser Sintering (SLS) applications layered manufacturing method, first performed on three-dimensional computer model to meet the needs of CAD and then layered software model stratification, get each cross-section, and then automatic control technology, the laser selectively sintering the computer corresponding to the inner cross section of the part of the powder fraction, tiered sintering. 

 

In theory, these sintering technology has high academic value, but most still in the laboratory stage, can only be used for small quantities of small size sintering molybdenum products, there is a great distance from the applied research industry. Molybdenum sintering technology has some prospect of major industrial application of microwave sintering technology, hot isostatic pressing, spark plasma sintering technology, aluminum thermal reduction - Sintering - body technology, following a general introduction of microwave sintering technology. 

 

Microwave absorbing material using microwave sintering can be converted to kinetic energy and intramolecular energy, the whole of the material is uniformly heated to a certain temperature and sintering to achieve densification purposes. Microwave sintering is one of the rapid preparation of high-quality new materials and important technique for preparing traditional materials with new properties are. 

 

Relative resistance sintering, flame sintering, sintering induction conventional sintering method, a microwave sintering method not only has the obvious energy saving, high efficiency, uniform heating (a temperature gradient in a conventional manner tenth), less sintered products (Nil) stress, deformation and sintering sharp cracks and other defects, precisely controlled sintering process advantages. Additionally, microwave heating technology can be used to purify the sublimation of molybdenum concentrate, molybdenum concentrate roasting, baking ammonium molybdate solution, molybdenum powder reduction and other technology sectors. However, due to the limited depth of penetration of the microwave, the diameter of the sintered material is generally not more than 60 mm, it is difficult to ensure the addition of microwave sintering in an atmosphere of pure H2, and therefore is difficult to avoid contamination of the oxidation of molybdenum during the sintering process. 

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