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Preparation of large-grained molybdenum powder difficulties are mainly three points: large size, high density, good liquidity. Satisfy the requirements of this 3:00 molybdenum powder morphology is ideal large diameter solid sphere, which is a non-conventional molybdenum powder particle size loose group of different morphologies. In general, increasing molybdenum powder reshaping technology are mainly two types of chemical and physical methods. The following will explain the physical laws of the approximate reduction method. 
 

Molybdenum powder fluidized bed reduction through phase two fluidized-bed reduction directly to the reduction of MoO3 granular or powdered molybdenum metal powder. Stage using ammonia as 1 reducing gas fluidization, at 400 ~ 650 ℃ reduction of MoO3 to MoO2; stage 2 reduction using hydrogen as the fluidizing gas at 700 ~ 1 400 ℃ MoO2 restore the metal Mo. Since in the fluidized bed, the gas - to obtain a sufficient contact between the solid and the most uniform temperature in the bed, fast response speed and thus, can effectively achieve the molybdenum powder size and shape control, the method of production of the molybdenum equiaxed powder particles, powder, good fluidity, high density subsequent sintering. This approach has yet to see information specific production applications. 
 

Define the so-called large-grain itself does not have a precise standard, is a relative concept. 

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