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The Formation of Icositetrahedron Molybdenum Powder and the Characteristics of Sintering Performance

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Abstract

The molybdenum powder with crystalline icositetrahedron morphology was produced by hydrogen reduction of MoO3. The particle size and morphology of MoO3 were specified to control the reaction rate. The phase change and microstructure during the MoO3-MoO2 reduction were highlighted to obtain MoO2, which tended to form polyhedral Mo powder. Reduction conditions such as temperature profile, hydrogen dew point, and flow rate were optimized systematically to favor the nucleation and growth of new phases. The molybdenum powder thereof was sintered with conventional method, and the microstructure of the post-sinter plate was determined. The density of 10.15 g/cm3 was achieved. The mechanism of the polyhedral powder formation and the sintering performance of 99 pct theoretical density were discussed.

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Authors and Affiliations

  1. JinDuiCheng Molybdenum Group Technical Center, Xi’an, 710077, P.R. China

    Xianqin Wang (Senior Engineer), Junhuai Liu (Senior Engineer), Fei Zhuang (Engineer), Hu Zhao (Engineer) & Li Jing (Engineer)

Authors
  1. Xianqin Wang
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  2. Junhuai Liu
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  3. Fei Zhuang
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  4. Hu Zhao
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  5. Li Jing
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Correspondence to Xianqin Wang.

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Manuscript submitted July 24, 2009.

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Wang, X., Liu, J., Zhuang, F. et al. The Formation of Icositetrahedron Molybdenum Powder and the Characteristics of Sintering Performance. Metall Mater Trans B 41, 1067–1073 (2010). https://doi.org/10.1007/s11663-010-9409-x

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  • DOI: https://doi.org/10.1007/s11663-010-9409-x

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