Changes of Particle Size and Morphology of Prepared W/Mo Powders during Hydrogen Reduction Process with the Addition of ROH (R = Li, Na, K)

抄録

In this paper, the influences of ROH (R=Li, Na, K) additions on the preparations of Tungsten (W)/Molybdenum (Mo) powders by hydrogen reduction of WO₃/MoO₂ in the temperature range of 800 °C to 1100 °C were studied in detail. In the absence of ROH addition, the prepared W/Mo powders basically maintained the morphology of raw oxide. However, with the assistance of ROH, the morphology and particle size of the products had been greatly changed. The grains of W and Mo were obviously coarsened, and micron-sized Mo powder and W powder with good dispersion can be prepared. In addition, the addition of ROH can promote the reduction rate of WO₃ but inhibit the reduction of MoO₂. Moreover, the effect of LiOH on grain growth is more significant than that of NaOH and KOH.