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Phase stability of Y + Gd co-doped zirconia

  • Noemí R. Rebollo , Olga Fabrichnaya and Carlos G. Levi EMAIL logo
Published/Copyright: January 11, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 94 Issue 3

Abstract

The high-temperature stability of zirconias co-doped with Y and Gd and synthesized as metastable single phases within the equilibrium tetragonal + cubic field is investigated. The motivation arises from strategies to enhance the insulating efficiency of thermal barrier systems by co-doping the conventional ZrO2-7.6 % YO1.5 composition with trivalent rare-earth cations. The issue is the partitioning of the metastable tetragonal (t′) or cubic (c′) phases into the equilibrium t + c phases dictated by the phase diagram, whereupon the tetragonal phase becomes susceptible to the disruptive monoclinic transformation. The experiments are based on compositions synthesized by precursor pyrolysis, all of which yield initially supersaturated single-phase solid solutions. It is found that t′ stabilized by Gd alone is significantly less resistant to partitioning at high temperature than its Y counterpart with the same amount of stabilizer. However, modest substitution of Gd for Y does not degrade the stability, and may improve it in some cases. Increasing the total amount of stabilizer generally enhances phase stability. The roles of thermodynamics and kinetics on the relative stability of the system are discussed.

Keywords: Thermal barrier coatings; Partially stabilized zirconia; Cubic-tetragonal equilibrium; Tetragonal phase stability; Rare-earth oxide dopants
Prof. Carlos G. Levi Materials Department College of Engineering University of California Santa Barbara, CA 93106-5050, USA Tel.:+1 805 893 2381 Fax:+1 805 893 8486
Dedicated to Professor Dr. Dr. h. c. Manfred Rühle on the occasion of his 65th birthday

Funding statement: The understanding of microstructures and phase transformations in zirconia systems is one of the many areas in materials science enriched by Professor Rühle’s contributions throughout his distinguished career. The authors are honored by the opportunity to participate in this special volume attesting to the high esteem in which the materials community holds Professor Rühle and his work.

Funding statement: Support for this investigation was provided by the Advanced Gas Turbine Research Program of the Department of Energy (Contract No. 01-01-SR093), and by the program of international research collaboration between the European Commission (GRD2-200-30211) and the National Science Foundation (DMR-0099695). Additional support for N. R. R. through a CONACyT scholarship is gratefully acknowledged. C. G. L. is grateful to the Alexander von Humbold Foundation for supporting his sabbatical at the Max Planck Institut für Metallforschung enabling the collaboration with the phase-diagram modeling group in Prof. Aldinger’s department. The authors would like to thank R. M. R. Leckie and A. S. Gandhi for technical assistance with the experiments.

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Received: 2002-11-13
Published Online: 2022-01-11

© 2003 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. The role of oxidation-induced cavities on the failure of the thermally grown oxide on binary β-NiAl alloys
  6. Phase stability of Y + Gd co-doped zirconia
  7. Mechanisms governing the distortion of alumina-forming alloys upon cyclic oxidation
  8. High-temperature oxidation of FeCrAl alloys: the effect of Mg incorporation into the alumina scale
  9. Nonlinear dielectric properties at oxide grain boundaries
  10. TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
  11. Processing of dense MgO substrates for high-temperature superconductors
  12. Microwave-induced crystallization of polysilazane-derived silicon carbonitride
  13. Schottky barrier formation in liquid-phase-sintered silicon carbide
  14. SrTiO3: a model electroceramic
  15. Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate
  16. Spreading of liquid Ag and Ag–Mo alloys on molybdenum substrates
  17. Nanoalloying in mixed AgmAun nanowires
  18. Never ending saga of a simple boundary
  19. Comparison of interfacial chemistry at Cu/α-alumina and Cu/γ-alumina interfaces
  20. Microstructure of Cu2O/Si interfaces, made by epitaxial electrodeposition
  21. Metal/oxide interfaces and their reaction with hydrogen
  22. Amorphous films at metal/ceramic interfaces
  23. Some thoughts on source monochromation and the implications for electron energy loss spectroscopy
  24. Determination of the contrast transfer function by analysing diffractograms of thin amorphous foils
  25. Progress in the preparation of cross-sectional TEM specimens by ion-beam thinning
  26. Quantification of interfacial segregation by analytical electron microscopy
  27. Quantification of elemental segregation to lath and grain boundaries in low-alloy steel by STEM X-ray mapping combined with the ζ-factor method
  28. Microstructure of Al/Ti metallization layers
  29. Connectivity of CSL grain boundaries and the role of deviations from exact coincidence
  30. Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
  31. Growth and microstructure of iron nitride layers and pore formation in ε-Fe3N
  32. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  33. Notifications/Mitteilungen
  34. Personal/Personelles
  35. Gesellschaftsnachricht
  36. International Conferences
https://doi.org/10.3139/ijmr-2003-0035
Keywords for this article
Thermal barrier coatings; Partially stabilized zirconia; Cubic-tetragonal equilibrium; Tetragonal phase stability; Rare-earth oxide dopants

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. The role of oxidation-induced cavities on the failure of the thermally grown oxide on binary β-NiAl alloys
  6. Phase stability of Y + Gd co-doped zirconia
  7. Mechanisms governing the distortion of alumina-forming alloys upon cyclic oxidation
  8. High-temperature oxidation of FeCrAl alloys: the effect of Mg incorporation into the alumina scale
  9. Nonlinear dielectric properties at oxide grain boundaries
  10. TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
  11. Processing of dense MgO substrates for high-temperature superconductors
  12. Microwave-induced crystallization of polysilazane-derived silicon carbonitride
  13. Schottky barrier formation in liquid-phase-sintered silicon carbide
  14. SrTiO3: a model electroceramic
  15. Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate
  16. Spreading of liquid Ag and Ag–Mo alloys on molybdenum substrates
  17. Nanoalloying in mixed AgmAun nanowires
  18. Never ending saga of a simple boundary
  19. Comparison of interfacial chemistry at Cu/α-alumina and Cu/γ-alumina interfaces
  20. Microstructure of Cu2O/Si interfaces, made by epitaxial electrodeposition
  21. Metal/oxide interfaces and their reaction with hydrogen
  22. Amorphous films at metal/ceramic interfaces
  23. Some thoughts on source monochromation and the implications for electron energy loss spectroscopy
  24. Determination of the contrast transfer function by analysing diffractograms of thin amorphous foils
  25. Progress in the preparation of cross-sectional TEM specimens by ion-beam thinning
  26. Quantification of interfacial segregation by analytical electron microscopy
  27. Quantification of elemental segregation to lath and grain boundaries in low-alloy steel by STEM X-ray mapping combined with the ζ-factor method
  28. Microstructure of Al/Ti metallization layers
  29. Connectivity of CSL grain boundaries and the role of deviations from exact coincidence
  30. Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
  31. Growth and microstructure of iron nitride layers and pore formation in ε-Fe3N
  32. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  33. Notifications/Mitteilungen
  34. Personal/Personelles
  35. Gesellschaftsnachricht
  36. International Conferences
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