METHOD OF RECEIVING OF NANO-DISPERSED POWDERS OF MOLYBDENUM Russian patent published in 2009 - IPC B22F9/22 B82B3/00 C22B34/34 

FIELD: metallurgy.

SUBSTANCE: para-molybdate of ammonium is restored in two stages. At the first stage initial para-molybdate of ammonium is restored by gaseous ammonia at uniform heating at a rate of lifting of temperature 180-200°C/hour up to achievement of temperature 540-560°C with receiving of intermediate compound, containing oxide-nitride phases of molybdenum. Then it is smoothly raised temperature up to 850°C and it is restored intermediate compound at the second stage up to metal by gaseous hydrogen with isolation at specified temperature during 2.0-2.5 hours. Additionally the first and the second stages of restoration is implemented in the same reactionary volume by means of changing of compound of gaseous phase, fed into reaction zone.

EFFECT: it is provided receiving of powder with content of admixtures of introduction not higher than 50 ppm (99,995 wt %) and achievement of yield not lower than 80-85%.

2 cl, 1 ex