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JOM

pp 1–6 | Cite as

Preparation of Ultrafine W Powder via Carbothermic Prereduction of Tungsten Oxide Followed by Deep Reduction with Hydrogen

  • Cheng-Min Song
  • Guo-Hua ZhangEmail author
  • Kuo-Chih Chou
  • Baijun Yan
Design, Development, and Manufacturing of Refractory Metals & Materials
  • 21 Downloads

Abstract

A two-step reduction method to synthesize tungsten powder with controllable size is proposed. Firstly, precursors composed of W and WO2 were synthesized via carbothermic prereduction of tungsten trioxide with different C/WO3 ratios at 1323 K, then the precursors were completely reduced by hydrogen to remove residual oxygen at 1023 K and 1223 K, respectively. It was observed that increasing the C/WO3 molar ratio in the prereduction stage was beneficial to decrease the particle size of the W powder. In the subsequent hydrogen reduction stage, the presence of the gaseous intermediate phase W-O-H had a great influence on the morphology of the final product. Tungsten powders with particle size ranging from micron to nanometer range could be prepared by controlling the C/WO3 ratio and hydrogen reduction temperature.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51734002).

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Cheng-Min Song
    • 1
  • Guo-Hua Zhang
    • 1
    Email author
  • Kuo-Chih Chou
    • 1
  • Baijun Yan
    • 2
  1. 1.State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijingChina
  2. 2.Department of Physical Chemistry of Metallurgy, School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina

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