3. Sintering, Phase Stability, and Thermal Conductivity of Plasma-Sprayed Gd2O3-Stabilized ZrO2

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. Mohamed N. Rahaman1,
  2. Jacob R. Gross1,
  3. Rollie E. Dutton2 and
  4. Hsin Wang3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Rahaman, M. N., Gross, J. R., Dutton, R. E. and Wang, H. (2005) Sintering, Phase Stability, and Thermal Conductivity of Plasma-Sprayed Gd2O3-Stabilized ZrO2, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch3

Author Information

  1. 1

    University of Missouri-Rolla, Department of Materials Science and Engineering, Rolla, MO 65409

  2. 2

    Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, OH 45433

  3. 3

    Oak Ridge National Laboratory, High Temperature Materials Laboratory, Oak Ridge, TN 37831

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

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Keywords:

  • prolonged;
  • equilibrium;
  • microscopy;
  • agglomerate;
  • impurities

Summary

Thermal barrier coatings (TBCs) made of Y2O3-stabilized ZrO2 are used extensively to protect and insulate the metallic structure of advanced gas turbine engines. For applications that require prolonged exposure to temperatures above 1000-1200 °C, structural changes produced by sintering and phase transformation limit the durability of the coatings. The objective of the present study was to investigate the use of Gd2O3 as an alternative stabilizer for ZrO2-based TBC materials. The influence of Gd2O3 concentration (4-20 mole percent) on the sintering and phase stability of plasma-sprayed ZrO2 powders was investigated and the data were compared with those for Y2O3-stabilized Z1O2. At an equivalent concentration (4 mole percent), Gd2O3-stabilized ZrO2 sintered more slowly but had a lower resistance to destabilization of the metasta-ble tetragonal (t′) phase, when compared to Y2O3-stabilized ZrO2. The thermal conductivity of Gd2O3-stabilized ZrO2 was lower than that for Y2O3-stabilized ZrO2. Mechanisms for the effect of Gd2O3 on the behavior of ZrO2 are discussed.