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Insight of Iron Whisker Sticking Mechanism from Iron Atom Diffusion and Calculation of Solid Bridge Radius

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Abstract

The sticking temperatures of three kinds of iron particles with different morphologies were examined at an inert atmosphere in a fluidized bed, indicating that the sticking temperature of a fresh reduction iron particle was lower than that of reagent iron particles, and that the sticking temperature of an iron particle with a whisker was lower than that of an iron particle without a whisker. Cavity defects on the surface of an iron particle with different morphologies were examined by positron annihilation spectroscopy. The results indicated that cavity defects on the surface of an iron particle with an iron whisker were higher than with others, which resulted in an easier surface diffusion of Fe atoms. From the calculation of a critical solid bridge radius, the critical solid bridge radius lowered with the decreasing of gas velocity and particle size. And when an instantaneous solid bridge radius was bigger than a critical solid bridge radius, sticking of the iron particle happened. The iron whisker made the surface diffusion rate of Fe atoms occur more quickly, which resulted in a faster growth rate of the instantaneous solid bridge radius. Therefore, the iron whisker supported the sticking.

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Acknowledgment

This work is supported by the National Natural Science Foundation of China under Grant No.51234001.

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Authors and Affiliations

  1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    Xuzhong Gong (Associate Professor), Ben Zhang (Assistant Professor) & Zhi Wang (Professor)

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Ben Zhang (Assistant Professor) & Zhancheng Guo (Professor)

Authors
  1. Xuzhong Gong
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  2. Ben Zhang
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  3. Zhi Wang
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  4. Zhancheng Guo
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Correspondence to Xuzhong Gong or Zhancheng Guo.

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Manuscript submitted April 28, 2014.

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Gong, X., Zhang, B., Wang, Z. et al. Insight of Iron Whisker Sticking Mechanism from Iron Atom Diffusion and Calculation of Solid Bridge Radius. Metall Mater Trans B 45, 2050–2056 (2014). https://doi.org/10.1007/s11663-014-0125-9

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  • DOI: https://doi.org/10.1007/s11663-014-0125-9

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