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Volume 39 Issue 4
Aug.  2021
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ZHANG Yong, ZHANG Guo-Hua, CHOU Kuo-Chih. Preparation of ultrafine Mo powders by MoO3 pre-reduction with insufficient carbon and hydrogen deep reduction[J]. Powder Metallurgy Technology, 2021, 39(4): 339-344. DOI: 10.19591/j.cnki.cn11-1974/tf.2021010010
Citation: ZHANG Yong, ZHANG Guo-Hua, CHOU Kuo-Chih. Preparation of ultrafine Mo powders by MoO3 pre-reduction with insufficient carbon and hydrogen deep reduction[J]. Powder Metallurgy Technology, 2021, 39(4): 339-344. DOI: 10.19591/j.cnki.cn11-1974/tf.2021010010
shu

Preparation of ultrafine Mo powders by MoO3 pre-reduction with insufficient carbon and hydrogen deep reduction

  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

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  • Corresponding author:

    ZHANG Guo-Hua, E-mail: ghzhang0914@ustb.edu.cn

  • Received Date: January 15, 2021
  • Available Online: July 26, 2021
    Graphical Abstract
    • Abstract
  • The pre-reduction molybdenum powders containing minor amount of MoO2 were prepared by the carbothermic reduction of MoO3, using the carbon black as the reducing agent, then the obtained pre-reduction molybdenum powders were deep reduced by hydrogen to finally prepare the ultrafine molybdenum powders with the average particle size of 99 nm to 190 nm. The effects of the carbothermic reduction temperature on the particle size and the residual carbon content by mass of the ultrafine molybdenum powders were studied. In the results, with the increase of C/MoO3 molar ratio from 2.0 to 2.1, the particle sizes of the ultrafine molybdenum powder products change little at the same reduction temperature. But the carbothermal reduction temperature shows a significant effect on the particle size and purity of products. When the C/MoO3 molar ratio is 2.1, with the increase of reduction temperature from 950 ℃ to 1150 ℃, the average particle sizes of products increase from 100 nm to 190 nm, and the content of the residual carbon by mass decreases from 0.030% to 0.009% after the hydrogen reduction.
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    • References (25)
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