Soviet Powder Metallurgy and Metal Ceramics

, Volume 14, Issue 3, pp 231–235 | Cite as

High-temperature oxidation of borides of the group IV metals

II. Oxidation of zirconium and hafnium diborides
  • B. F. Voitovich
  • É. A. Pugach
Test Methods and Properties of Materials
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Conclusions

  1. 1.

    A study was made of the oxidation of dense ZrB2 and HfB2 specimens over the temperature range 500–1600°C.

     
  2. 2.

    It is shown that the dissolution of oxygen (nitrogen) in the lattices of these borides depends on the protective properties of the scale layers forming on them. Its extent decreases with rise in temperature owing to the formation of borates (900–1200°C) and the sintering of the scale (1300–1600°C).

     
  3. 3.

    It has been established that the good oxidation resistance of ZrB2 and HfB2 is due to the formation of borates at certain temperatures (900–1200°C) and to the sintering of the scale at higher temperatures. The latter phenomenon accounts for the absence under these conditions of the nitride phases ZrN and HfN at the inner interfacial boundaries.

     

Keywords

Oxidation Oxygen Nitrogen Nitride Borate 

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Literature cited

  1. 1.
    F. H. Brown, Progr. Rept. No. 20-252, Jet Propulsion Laboratory, California, February 1955, p. 25.Google Scholar
  2. 2.
    J. B. Berkowitz-Mattuck, Thermodynamic and Kinetic Studies for Refractory Materials Program, Rept. ASD — TDR, Pt. II, 62, 204, May, 1963.Google Scholar
  3. 3.
    J. B. Berkowitz-Mattuck, J. Electrochem. Soc.,113, 908 (1966).Google Scholar
  4. 4.
    R. S. Markevich and L. Ya. Markovskii, Zh. Prikl. Khim.,33, 1008 (1960).Google Scholar
  5. 5.
    G. A. Meerson, G. V. Samsonov, R. B. Kotel'nikov, et al., in: Boron [in Russian], Proceedings of a Conference on the Chemistry of Boron and Its Compounds, Goskhimizdat, Moscow (1958), p. 58.Google Scholar
  6. 6.
    R. F. Voitovich, É. A. Pugach, and L. A. Men'shikova, Poroshkovaya Met., No. 6 (1967).Google Scholar
  7. 7.
    A. Lebugle and Y. Montel, Compt. Rend. Acad. Sci.,274, 1512 (1972).Google Scholar
  8. 8.
    Yu. Paderno, T. I. Serebryakova, and G. V. Samsonov, Tsvetn. Metal.11, 48 (1959).Google Scholar

Copyright information

© Plenum Publishing Corporation 1975

Authors and Affiliations

  • B. F. Voitovich
    • 1
  • É. A. Pugach
    • 1
  1. 1.Institute of Materials ScienceAcademy of Sciences of the Ukrainian SSRUkraine

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