Soviet Powder Metallurgy and Metal Ceramics

, Volume 27, Issue 6, pp 411–414 | Cite as

Kinetics of the reduction-oxidation processes taking place during the heating of powders produced from cast iron swarf

  • S. S. Kiparisov
  • O. V. Padalko
  • E. S. Bogodukhova
  • L. A. Pronin
  • A. S. Mints
Theory, Production Technology, and Properties of Powders and Fibers
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Conclusions

An investigation was carried out, using the methods of gravimetric and chromatographic analyses, into the kinetics of the reduction-oxidation annealing (self-annealing) of cast iron swarf powders in an inert atmosphere. Reduction-oxidation was found to occur in two stages, in the temperature ranges 798–1163 and 1163–1523°K, respectively. The dominant process in the first stage was reduction of oxides by combined carbon, and in the second stage, reduction of oxides by gaseous CO. A study was made of the effect of density of material being heated on its degree of decarburization. The least decarburization of material was recorded during the heating of a loosely poured powder, and the greatest decarburization, during the heating of compacts with a relative density of 0.4%.

Keywords

Oxide Iron Atmosphere Relative Density Cast Iron 

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Literature cited

  1. 1.
    A. Hanawa et al., “Reclamation and uses of cast iron powders in powder metallurgy,” Dzire Kaganu, No. 21, 148–153 (1984).Google Scholar
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    Yu. A. Gratsianov, B. N. Putimtsev, and A. F. Silaev, Metal Powders from Melts [in Russian], Metallurgiya, Moscow (1970).Google Scholar
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    T. G. Nikolov, V. A. Kolchanov, L. I. Armyanova, and S. B. Sorin, “Decarburization of cast iron parts in the gaseous phase,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 3, 19–23 (1980).Google Scholar

Copyright information

© Plenum Publishing Corporation 1988

Authors and Affiliations

  • S. S. Kiparisov
    • 1
    • 2
  • O. V. Padalko
    • 1
    • 2
  • E. S. Bogodukhova
    • 1
    • 2
  • L. A. Pronin
    • 1
    • 2
  • A. S. Mints
    • 1
    • 2
  1. 1.Moscow Institute of Fine Chemical TechnologyUSSR
  2. 2.Moscow Institute of Steel and AlloysUSSR

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