二步还原温度及料层厚度对钼粉性能的影响OA

During the hydrogen reduction process of molybdenum dioxide(MoO2)to produce molybdenum powder,process parameters such as reduction temperature and material layer thickness have a decisive influence on the properties of the resulting molybdenum pow-der.Thermogravimetric-differential thermal analysis determined that the reduction of MoO2 in a hydrogen atmosphere is an endothermic reaction,with an onset temperature of 550℃and a completion temperature of 760℃.Based on this,multiple sets of process experi-ments were conducted using a push-boat reduction furnace to systematically study the effects of reduction temperature and material layer thickness on the morphology,apparent density,tap density,particle size,and particle size distribution of molybdenum powder.The results indicate that the reduction temperature significantly regulates the reduction degree and particle structure of molybdenum powder:as the temperature increases,the oxygen content of the molybdenum powder decreases,the particle size increases,but the proportion of agglomerated powder also increases.The material layer thickness promotes particle growth of molybdenum powder by altering the partial pressure of water vapor in the reaction atmosphere.An increase in layer thickness coarsens the molybdenum particle grains and modifies the particle size distribution pattern.