The impact of reduction conditions on molybdenum morphology

Do different reduction conditions influence the morphology of molybdenum powder? Which role are temperature, dew point, hydrogen content and the flow rate of reduction gas playin in this process?

SEM analysis of the change in surface morphology with variation in reduction conditions: (a) rod-shaped particles (b, e) equiaxed-shaped particles (c) spongy-shaped particles


At the 19th Plansee Seminar Johanna Bolitschek concerned the influence of different reduction conditions (temperature, dew point and hydrogen content as well as flow rate of reduction gas) on the morphology of molybdenum powder. Material was produced by a two-stage reduction of different sized molybdenum trioxide particles with hydrogen and the experiments were carried out in a rotary kiln. It was found that the specific surface area is mainly influenced by temperature and decreases with rising temperature. The particle size of the raw material, the dew point as well as the hydrogen content of the reduction atmosphere not only have a significant influence on the morphology of the produced molybdenum powder, but also change the impact of the temperature. The results imply that the effect of a single reduction parameter on the properties of the resulting powder always have to be seen in context with the other reaction conditions.

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