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Journal of Materials Science

, Volume 24, Issue 12, pp 4253–4260 | Cite as

Intermediate temperature oxidation in silicon nitride yttria ceramics

  • Kamal E. Amin
  • Kerry N. Siebein
  • Jonathan A. Wade
Papers

Abstract

Silicon nitride billets with both 4% and 8% Y2O3 additives have been subjected to oxidation treatments for up to 300 h, in air, in the temperature range 700 to 1000° C. Flexure strength and weight gain measurements together with both scanning and transmission electron microscopy and X-ray diffraction studies were conducted on these billets in an effort to understand the oxidation process. It appears that the degradation phenomena is associated with both the formation of phases outside the Si3N4-Si2ON2-Y2Si2O7 compatibility triangle of the system Si3N4-SiO2-Y2O3 and with the decomposition of W-containing phases at and near the grain boundaries.

Keywords

Oxidation Transmission Electron Microscopy Weight Gain Nitride Yttria 
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.
    U. R. Evans, “The Corrosion and Oxidation of Metals” (Edward Arnold, London, 1960).Google Scholar
  2. 2.
    S. C. Singhal, J. Mater Sci 11 (1976) 500.Google Scholar
  3. 3.
    F. F. Lange, S. C. Singhal and R. C. Kuz-Nicki, J. Amer. Ceram. Soc. 60 (1977) 249.Google Scholar
  4. 4.
    G. E. Gazza, “Influence of Composition and Process Selection on Densification of silicon Nitride”, AMMRC TR-82-32, AD/A116-652-US Department of Commerce, NTIS (1982).Google Scholar
  5. 5.
    J. A. Mangels and J. R. Bar, US Pat. 4 388 414 (1983).Google Scholar
  6. 6.
    A. Arias, “Effect of Yttria Additions on Properties of Pressureless Sintered Silicon Nitride”, NASA Technical Paper 1899 (1981).Google Scholar
  7. 7.
    G. Q. Weaver and J. W. Lucek, Amer. Ceram. Soc. 57 (1978) 1131.Google Scholar
  8. 8.
    J. W. Lucek, “Silicon Nitride — Yttrium Oxide — Thermal Instability”, Norton internal report (1984).Google Scholar
  9. 9.
    R. R. Govila, J. A. Mangels and J. R. Baer, Amer. Ceram. Soc. 68 (1985) 413.Google Scholar
  10. 10.
    C. L. Quackenbush, “GTE Si3N4 — Based Ceramics”, Highway Vehicles Systems Contracts Coordination Meeting — 24–26 April 1979, Dearborn, Michigan.Google Scholar
  11. 11.
    S. Schoun, “Effect of W and WC on the Oxidation Resistance of Yttria Doped Si3N4”, NASA Report 81529 (1982).Google Scholar
  12. 12.
    S. Dutta, Amer. Ceram. Soc. Commun. C-2 65 No. 1 (1982).Google Scholar

Copyright information

© Chapman and Hall Ltd 1989

Authors and Affiliations

  • Kamal E. Amin
    • 1
  • Kerry N. Siebein
    • 1
  • Jonathan A. Wade
    • 1
  1. 1.Advanced CeramicsNorton CompanyNorthboroUSA

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