Soviet Powder Metallurgy and Metal Ceramics

, Volume 8, Issue 2, pp 123–127 | Cite as

An investigation into the external friction of niobium and tantalum carbides at high temperatures in vacuum

  • G. V. Samsonov
  • M. S. Koval'chenko
  • Yu. G. Tkachenko
Test Methods and Properties of Materials

Conclusions

  1. 1.

    An investigation was carried out into the temperature dependence of external friction between specimens made from NbC0.98 and also between specimens made from TaC0.97 in the temperature range extending from room temperature to 1800°C in a vacuum of 10−5 mm Hg.

     
  2. 2.

    The coefficient of friction of niobium carbide has its minimum at 1200°C and that of tantalum carbide at 1300°C. Above this temperature a sharp increase in the coefficient of friction is observed. The reason for this increase is an intense adhesion interaction between contact surfaces.

     
  3. 3.

    It was found that the loading of a static contact surface between the materials under investigation at high temperatures produces creep processes controlled by transverse slip of dislocations with a considerable contribution from the diffusion mechanism. The creep activation energy in the temperature range 1300–1500°C is 1.3 eV for NbC and 1.4 eV for TaC.

     
  4. 4.

    It was shown that the slip activation energy is determined mainly by the presence of convalent bonds in pure materials and compounds.

     

Keywords

Carbide Activation Energy Niobium Contact Surface Tantalum 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    G. V. Samsonov and K. I. Portnoi, Refractory-Metal Alloys [in Russian], Oborongiz, Moscow (1961).Google Scholar
  2. 2.
    M. F. Amateau and W. A. Glaeser, Wear,7, 385 (1964).Google Scholar
  3. 3.
    A. P. Semenov and V. V. Pozdnyakov, DAN SSSR,160, 811 (1965).Google Scholar
  4. 4.
    B. L. Mordike, Wear,3, 374 (1960).Google Scholar
  5. 5.
    B. L. Mordike, ASLE Trans.,3, 110 (1960).Google Scholar
  6. 6.
    C. A. Brookes, Wear,9, 103 (1966).Google Scholar
  7. 7.
    A. Ya. Artamonov and Yu. G. Tkachenko, Zavodsk. Lab.,34, No. 5, 609 (1968).Google Scholar
  8. 8.
    I. V. Kragel'skii, Friction and Wear [in Russian], Izd. “Mashinostroenie,” Moscow (1968).Google Scholar
  9. 9.
    G. V. Samsonov, A. L. Burykina, and O. V. Evtushenko, Avtomat. Svarka, No. 10, 30 (1966).Google Scholar
  10. 10.
    N. N. Rykalin, M. Kh. Shorshorov, and Yu. P. Krasulin, in: The Nature of Metallic Phases, and the Type of Chemical Bonds in These Phases [in Russian], IMET im. Baikova, Moscow (1965), p. 37.Google Scholar
  11. 11.
    J. R. Low, in: Failure of Solid Bodies [Russian translation], Izd. “Metallurgiya,” Moscow (1967), p. 7.Google Scholar
  12. 12.
    R. M. Garber and I.A. Gindin, Uspekhi Fiz. Nauk,70, 57 (1960).Google Scholar
  13. 13.
    G. V. Samsonov, Poroshkovaya Met., No. 12, 49 (1966).Google Scholar
  14. 14.
    Ya. I. Frenkl', ZhÉTF,16, 29 (1946).Google Scholar
  15. 15.
    B. Ya. Pines, Papers on Physics of Metals [in Russian], Izd. KhGU, Khar'kov (1961).Google Scholar
  16. 16.
    J. Friedel, Dislocations [Russian translation], Izd. “Mir,” Moscow (1967).Google Scholar
  17. 17.
    Ya. E. Geguzin, Physics of Sintering [in Russian], Izd. “Nauka,” Moscow (1967).Google Scholar
  18. 18.
    Yu. V. Mil'man and V. I. Trefilov, in: The Mechanism of Metals [in Russian], Izd. “Naukova Dumka,” Kiev (1966), p. 59.Google Scholar
  19. 19.
    G. V. Samsonov, Planseeberichte für Pulvermetallurgie,15, 3 (1967).Google Scholar

Copyright information

© Consultants Bureau 1969

Authors and Affiliations

  • G. V. Samsonov
    • 1
  • M. S. Koval'chenko
    • 1
  • Yu. G. Tkachenko
    • 1
  1. 1.Institute of Problems of MaterialsAcademy of Sciences of the Ukrainian SSRUSSR

Personalised recommendations