This study investigated the effect of water vapor partial pressure variations along the hydrogen flow direction on the phase transformation of molybdenum oxide (MoO) and the properties of resulting molybdenum (Mo) powder. The results indicated that the reduction process of MoO → MoO → Mo exhibited variations in particle size, oxygen content, and morphology along the hydrogen flow directions. In both the first-stage and second-stage reduction processes, the reduction rates decreased by 1.7%/cm and 2.6%/cm at minimum hydrogen flow along the direction of hydrogen flow, respectively. And the average particle size of fully reduced Mo powder increased from 1.23 μm to 1.61 μm, whereas its oxygen content decreased from 1400 ppm to 1100 ppm. Besides, the increase in the hydrogen flow rate leads to reduced variations in reduction rates, average particle size, and oxygen content along the hydrogen flow direction. These findings lay the theoretical foundation for the industrial production and preparation of high-quality Mo powder.

中文翻译：

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氧化钼氢气还原过程中钼粉沿氢气流的反应和性能差异研究


本研究研究了沿氢气流动方向的水蒸气分压变化对氧化钼 (MoO) 相变的影响以及所得钼 (Mo) 粉末的性能。结果表明，MoO→MoO→Mo的还原过程沿氢气流动方向呈现出粒径、氧含量和形貌的变化。在第一阶段和第二阶段还原过程中，在最小氢气流量下沿氢气流动方向还原率分别降低了1.7%/cm和2.6%/cm。完全还原的Mo粉的平均粒径从1.23μm增加到1.61μm，而氧含量从1400ppm下降到1100ppm。此外，氢气流量的增加导致还原率、平均粒径和氧含量沿氢气流动方向的变化减小。这些研究成果为高品质钼粉的工业化生产和制备奠定了理论基础。