EVaporation State Preparation Of Ultra-Fine Powder Of Molybdenum Trioxide Reduction
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- Category: Molybdenum knowledge
- Published on 14 August 2014
- Written by ling
- Hits: 248
Currently, the method of the preparation of ultrafine molybdenum powder are: evaporation state trioxide reduction, activation reduction and twelve Ammonium hydrogen reduction method. Evaporation state briefly trioxide reduction method below.
Evaporation reduction state of molybdenum trioxide, MoO3 is powder (purity 99.9%) is mounted on a molybdenum boat, placed in a preheated the furnace 1300 ℃ ~ 1500 ℃ is evaporated into gas, the flow rate of 150mL / min of H2-N2 gas and the flow rate of 400 mL / min of H2 contained in the mixed gas under the folder, MoO3 vapor into the reaction zone through the reduced to the ultrafine Mo powder. This method can be obtained spherical particles with a uniform particle size of 40 ~ 70 nm molybdenum powder, but it is difficult to control the process parameters, including, MoO3-N2 temperature, and MoO3 and mixed H2-N2 gas stream components are of great influence on the particle size .
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