Journal of Materials Science

, Volume 26, Issue 15, pp 3991–3995 | Cite as

Microstructure and phase composition of ZrO2-CeO2 thermal barrier coatings

  • P. D. Harmsworth
  • R. Stevens
Papers

Abstract

The microstructure and phase composition of zirconia plasma-sprayed thermal barrier coatings containing 12 to 25 wt% ceria addition have been investigated. Coatings containing less than 20 wt% CeO2 are composed of a monoclinic and retained metastable transformable tetragonal phase due to the constraint developed by the small crystal size. This phase transforms readily under moderate thermal stresses. Compositions greater than 20 wt% CeO2 are composed only of a metastable non-transformable tetragonal, tz′ structure, resistant to transformation under thermal or mechanical stresses. The microstructure of this phase shows microstructural similarities to the high-yttria t′-phase in the ZrO2-Y2O3 system, such as transformation twins and anti-phase boundaries. This suggests that the phase observed in the ZrO2-CeO2 system forms by a similar mechanism.

Keywords

Microstructure Zirconia Ceria CeO2 Thermal Stress 

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References

  1. 1.
    P. D. Harmsworth andR. Stevens,J. Mater. Sci. in press.Google Scholar
  2. 2.
    Idem., ibid, in press.Google Scholar
  3. 3.
    G. W. Heintze andR. McPherson, in Proceedings of Conference on Surface Coating Technology (1987).Google Scholar
  4. 4.
    T. Coyle, W. Coblenz andB. A. Bender,Amer. Ceram. Soc. Bull.62 (1983) 966.Google Scholar
  5. 5.
    M. Yoshimura, E. Tani andS. Somiya,Solid State Ionics314 (1981) 447.Google Scholar
  6. 6.
    E. Tani, M. Yoshimura andS. Somiya,J. Amer. Ceram. Soc.66 (1983) 506.Google Scholar
  7. 7.
    P. Duez andF. Odell,ibid.33 (1950) 274.CrossRefGoogle Scholar
  8. 8.
    R. A. Miller,Adv. Ceram.3 (1981) 241.Google Scholar
  9. 9.
    M. Watanabe, S. Iio andI. Fakaura,ibid.12 (1984) 382.Google Scholar
  10. 10.
    K. Tsakuma, Y. Kubotu andT. Tsakidate,ibid.12 (1984) 391.Google Scholar
  11. 11.
    T. K. Gupta, J. H. Bechtold, R. C. Kanicki, L. H. Cadoff andB. R. Rossing,J. Mater. Sci.12 (1977) 2421.CrossRefGoogle Scholar
  12. 12.
    T. K. Gupta andC. A. Anderson,Ceram. Eng. Sci. Proc.7 (1986) 1150.CrossRefGoogle Scholar
  13. 13.
    S. Meriani,Sci. Ceram.13 (1986) 1.Google Scholar
  14. 14.
    V. Lanteri, A. H. Heuer andT. E. Mitchell,Adv. Ceram.12 (1984) 118.Google Scholar

Copyright information

© Chapman and Hall Ltd 1991

Authors and Affiliations

  • P. D. Harmsworth
    • 1
  • R. Stevens
    • 1
  1. 1.Division of Ceramics, School of MaterialsThe University of LeedsLeedsUK

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