Design of Ceramic Microstructure of Nanoscaled Transitional Alumina

  • E. Fidancevska
  • J. Bossert
  • V. Vassilev
  • R. Adziski
  • M. Milosevski
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)

Nanoscaled transitional alumina (γ-, δ-, θ- → α-phase) consolidated at P = 500 MPa and T = 1,500°C for 30 min gave compacts with a density of 75% of theoretical density (TD) and a vermicular microstructure. The temperature of the transition to α-Al2O3 was 1,304°C. After mechanical activation by attriting, the transformation temperature to α-Al2O3 was reduced to 1,080°C. The density of the compacts consolidated at P = 500 MPa and T = 1,500°C for 30 min was 95% TD. The grain size distribution reached from 100 to 600 nm.

Keywords

nanoscaled alumina mechanical activation microstructure 

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References

  1. 1.
    M. Kumagai and G. Messing, J. Am. Ceram. Soc. 68, 500 (1985).CrossRefGoogle Scholar
  2. 2.
    S. Kirchuchi, T. Ban, K. Okada, N. Otsuka, J. Mat. Sci. Lett. 11, 471 (1992).CrossRefGoogle Scholar
  3. 3.
    J. Bossert and E. Fidancevska, Sci. Sintering 39, 117 (2007).CrossRefGoogle Scholar
  4. 4.
    R. Oberacker, S. Poehmitzsh, H. Hofius, Cfi/Ber. DKG 78, 45 (2001).Google Scholar
  5. 5.
    M. Nikolic, N. Nikolic, S. Radic, Sci. Sintering 32, 149 (2000).Google Scholar
  6. 6.
    W. Dynys and J.W. Halloran, J. Am. Ceram. Soc. 65, 442 (1982).CrossRefGoogle Scholar

Copyright information

© Springer Science + Business Media B.V 2009

Authors and Affiliations

  • E. Fidancevska
    • 1
  • J. Bossert
    • 2
  • V. Vassilev
    • 3
  • R. Adziski
    • 1
  • M. Milosevski
    • 1
  1. 1.Faculty of Technology and MetallurgyUniversity St. Cyril and MethodiusSkopjeRepublic of Macedonia
  2. 2.Institute of Materials and Technoogy.Friedrich Schiller UniversityJenaGermany
  3. 3.University of Chemical Technology and MetallurgySofiaBulgaria

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