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Journal of Materials Science

, Volume 30, Issue 22, pp 5723–5731 | Cite as

Interaction between the TiC(TiCN)-Ni-Mo hardmetals and chromium vapours

  • I. Yu. Konyashin
Papers

Abstract

The interaction between TiC or TiCN-based hardmetals with a Ni-Mo binder, or cermets, and chromium vapour in a vacuum was investigated over a wide temperature range acceptable for depositing wear-resistant coatings without the formation of a liquid phase in the cermets. Computer modelling in the Ti-C-Cr system showed that a direct interaction of TiC with chromium, leading to the formation of chromium carbides, is not possible because of the high thermodynamic stability of titanium carbide. It was established experimentally that as a result of the interaction between the cermets and chromium vapours, a coating characterized by a two-layer structure was deposited on the cermet surface. The coating consists of an inner layer adjacent to the substrate, which is composed of the chromium and carbon solid solution in nickel, and an outer layer composed of a mixture of (Cr, Ni)7C3 and (Cr, Ni)23C6. The activation energy of the deposition process is 387 kJ mol−1 which is close to the value of the chromium heat of evaporation. The coating deposition process is supposed to be limited by the rate of the external supply of chromium from the vapour phase. The results of the investigation of the structure, composition and morphology of the coating are presented. A mechanism responsible for the interaction of the cermets with chromium vapour leading to the formation of the two-layer coating, is proposed.

Keywords

Carbide Chromium Activation Energy Deposition Process Wide Temperature Range 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    W. Shintlmeister, O. Pacher, K. Pffafinger and T. Raine, J. Electrochem. Soc. 123 (1976) 924.CrossRefGoogle Scholar
  2. 2.
    W. Shintlmeister, O. Pacher, T. Krall and T. Raine, Powder Metall. Int. 13 (1981) 71.Google Scholar
  3. 3.
    T. Lenskaya, V. Toropchenov, A. Anikeev and T. Mamaeva, “Manufacture and Application of Cemented Carbides” (Metallurgia, Moscow, 1982) p. 107.Google Scholar
  4. 4.
    O. Roman, L. Kiriluk and S. Chernouhova, Sov. Powder Metall. Met. Ceram. 6 (1987) 52.Google Scholar
  5. 5.
    K. Bartsch, A. Leonardt, E. Wolf, M. Schonherr and M. Seidler, J. Mater. Sci. 22 (1987) 3032.CrossRefGoogle Scholar
  6. 6.
    I. Konyashin, Yu. Korolev, A. Anikeev, A. Korchagin and A. Zarahkani, “Proceedings of the 12th International Plansee Seminar”, edited by H. Bildstein and H. Ortner, Reutee, Austria, Vol. 3 (Metallwerk Plansee, Reutee, 1989) p. 119.Google Scholar
  7. 7.
    I. Frantsevich, L. Gaevskaya and L. Beloborodov, Powder Metall. 5 (1983) 53.Google Scholar
  8. 8.
    Ja. Musikant and V. Samoilov, “Cutting Tools with Cermets Inserts” (NIIMASH, Moscow, 1984).Google Scholar
  9. 9.
    V. Kruchkov, Machines Tools 7 (1987) 25.Google Scholar
  10. 10.
    M. Kato, H. Yoshimura and Y. Fujiwara, in “Proceedings of the 12th International Plansee Seminar”, Reutee, Austria, Vol. 3 (1989) p. 93.Google Scholar
  11. 11.
    I. Konyashin A. Zarakhani and E. Leonov, Non-Ferrous Metals 5 (1988) 76.Google Scholar
  12. 12.
    S. Badrak, T. Bartnitskaya and M. Baryshevskaya, Powder Metall. 9 (1981) 66.Google Scholar
  13. 13.
    J. Guno and D. Kolar, J. Less-Common Metals 31 (1973) 331.Google Scholar
  14. 14.
    K. Mishenko and A. Ravdel (eds), “Reference Book of Physical Chemistry” (Leningrad, 1974).Google Scholar
  15. 15.
    V. Tretyakov, “Materials Science and Technology of Hardmetals” (Metallurgia, Moscow, 1976).Google Scholar
  16. 16.
    V. Grigoryeva and V. Klimenko, “Chromium Carbide Alloys” (Naukova Dumka, Kiev, 1961).Google Scholar
  17. 17.
    W. Koster et al. Arch. Eisenhutten. 10 (1955) 72.Google Scholar

Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • I. Yu. Konyashin
    • 1
  1. 1.Hardmetal TechnologiesMoscowRussia

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