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Vacuum Sintering of Zirconia Based Ceramics

  • S. Kulkov
  • T. Sablina
  • N. Savchenko

Abstract

Plasma spray pyrolysis method for fabricating ceramics is growing in attention from scientific and technological points of view [1,2]. This method seems to be a suitable one for the preparation of ultrafine powders of the multicomponent oxide systems in which each component is uniformly distributed. Although these unique spray pyrolysis zirconia-base powders have been synthesized, only few investigators have been reported dealing with the fabrication of specimens from the dense, high-strength ceramics. It may be due to the major disadvantage of the spray pyrolysis powders. As a rule, they consist from the hollow spheres and irregularly-shaped particles [1,3]. To improve the sinterability of highly agglomerated ceramic powders, various approaches such as mechanical milling of powders [4] as well as adding of various dopant, [5] have been reported in the literature. However, these methods often reveal themselves to be too tedious processes. The increase of the sintering temperature with the purpose to intensify diffusion processes is technically easier to do, however this may used not for all materials. For example, optimum sintering temperatures for conventionally fabricated Y-TZP at which the densification will be reasonably rapid, but where the abnormal grain growth will not occur are less 1600 °C [6]. At temperatures above 1600°C the increasing grain size exceeds the critical grain size for spontaneous tetragonal-to-monoclinic transformation in the sample and leads to the cracking which accompany the transformation reduces the overall density.

Keywords

Fracture Toughness Tetragonal Phase Hollow Sphere Spray Pyrolysis High Fracture Toughness 
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.
    L. Messing, S-C. Zhang, and G. V. Jayanthi, “Ceramic Powder Synthesis by Spray Pyrolysis,”. Am. Ceram. Soc., 76[11] 2707–26 (1993).CrossRefGoogle Scholar
  2. 2.
    M. Kagawa, M. Kikuchi, Y. Syono, and T. Nagae, “Stability of Ultrafine Tetragonal ZrCb Coprecipitated with AI2O3 by the Spray-ICP Technique,” J. Am. Ceram. Sor., 66[11] 751–754(1983).CrossRefGoogle Scholar
  3. 3.
    T. Yano, K. Nonaka, N. Otsuka, K. Kawai, K. Uematsu, and K. Saito, “Preparation and Characterization of Fine Alumina-Zirconia Powders by Spray Pyrolysis of Nitrate Solutions”; pp. 165–72 in Proceeding of MRS International Meeting on Advances Materials, Vol. 3, Edited by M. Doyama, S. Somiya, N. Yamamoto, and R. P. H. Chang. Materials Research Society, Pittsburgh, PA, 1989.Google Scholar
  4. 4.
    F. Lange, H. Shubert, N. Claussen, and Ruhle M, “Effects of Attrition Milling and Post-Sintering Heat Treatment on Fabrication Microstructure and Properties of Transformation Toughened ZrCh,” J Mater. Sei., 21, 768–74 (1986).CrossRefGoogle Scholar
  5. 5.
    G. Theunissen, A. M. Winnubst, and A. J. Burggraaf, “Effect of Dopants on Sintering Behavior and Stability of Tetragonal Zirconia Ceramics,” J Europ. Ceram. Sei., 9[4] 251–63 (1992).CrossRefGoogle Scholar
  6. 6.
    I. Nettleship and R. Stevens, “Tetragonal Zirconia Polycrystal (TZP) — A Review,” Int. J. High Technology Ceramics, 3, 1–32 (1987).CrossRefGoogle Scholar
  7. 7.
    K. Niihara, R. Morena, and D. P. H. Hasselman, “Evaluation of Kic of Brittle Solids, by Indentation Method with Low Crack-to-indent Ratio,” J Mater. Sei. Lett., 1, 13–16 (1982).CrossRefGoogle Scholar
  8. 8.
    A. Heuer, R. Chaim, and V. Lanteri “Review: Phase Transformations and Microstructural Characterization of Alloys in the System Y2O3-ZrOi”; pp. 3–20 in Advances in Ceramics, Vol. 24, Science and Technology of Zirconia HI Edited by S. Somiya, N. Yamamoto, and H. Yanagida. American Ceramic Society, Westerville, OH, 1988.Google Scholar
  9. 9.
    A. Heuer, N. Claussen, W. M. Kriven, and M. Ruhle, “Stability of Tetragonal ZrCb Particles in Ceramic Matrices,” J. Am. Ceram. Soc., 65[12] 642–50 (1982).CrossRefGoogle Scholar
  10. 10.
    R. Rice, “Comment on “Black Color in Partially Stabilized Zirconia”,” J. Am. Ceram. Soc., 74[7] 1745–46 (1991).CrossRefGoogle Scholar
  11. 11.
    V. Verneker and D. Nagle, “Effect of Reduction on Vickers Hardness of Stabilized Zirconia,” J. Mater. Sci. Lett., 9, 192–94(1990).CrossRefGoogle Scholar
  12. 12.
    H. Scott, “Phase Relationships in the Zirconia-Ittria System,” J. Mater. Sci., 10, 1527–35(1975).CrossRefGoogle Scholar
  13. 13.
    M. Swain, “Grain-Size Dependence of Toughness and Transformability of 2 Mol% Y-TZP Ceramics,” J. Mater. Sci. Lett., 5, 1159–62 (1986).CrossRefGoogle Scholar
  14. 14.
    M. Swain and L. R. F. Rose, “Strength Limitations of Transformation-Toughened Zirconia Alloys,” J. Am. Ceram. Soc., 69[7] 511–18 (1986).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • S. Kulkov
    • 1
  • T. Sablina
    • 1
  • N. Savchenko
    • 1
  1. 1.Institite of Strength Physics and Material SciencesRAS 2/1TomskRussia

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