14. The Water-Vapour hot Gas Corrosion Behavior of Al2O3-Y2O3 Materials, Y2Si05 and Y3Al5O12-Coated Alumina in a Combustion Environment

  1. Dongming Zhu,
  2. Uwe Schulz,
  3. Andrew Wereszczak and
  4. Edgar Lara-Curzio
  1. Marco Fritsch and
  2. Hagen Klemm

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291320.ch14

Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3

Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3

How to Cite

Fritsch, M. and Klemm, H. (2006) The Water-Vapour hot Gas Corrosion Behavior of Al2O3-Y2O3 Materials, Y2Si05 and Y3Al5O12-Coated Alumina in a Combustion Environment, in Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3 (eds D. Zhu, U. Schulz, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291320.ch14

Author Information

  1. Fraunhofer-lnstitut for Ceramic Materials and Sintered Materials, IKTS Dresden, Winterbergstrasse 28. 01277 Dresden, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080535

Online ISBN: 9780470291320

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Keywords:

  • TBC;
  • SIC;
  • CMC;
  • YAG;
  • EBC

Summary

The water vapour hot gas corrosion behavior of various oxide ceramics in the AI2O3-Y2O3 system (α-Al2O3, Y2Al5O12+α-Al2O3, Y3Al5O12 [yttrium aluminium garnet, or YAG], YAlO3 [yttrium aluminium perovskite, or YAP], Y4Al2O9 [yttrium aluminium monocline, or YAM], Y4Al2O9+Y2O3) and of Y2SiO5 was determined. The tests were performed in a high temperature burner rig at temperatures between 1200 °C and 1500 °C, water vapour partial pressure of 0.24 atm, a total pressure of I atm, gas flow velocity of 100 m/s and test times about 100 ‥ 350 hours. YAG, YAP and YAM showed an order of magnitude lower corrosion rate in comparison to alumina. Nevertheless degradation and phase changes on surface were observed above 1350 °C. Y2SiO5 showed absolutely no degradation even after corrosion exposure at 1500 °C. The dependence of the temperature is discussed by compositional and microstructurai investigations. Finally corrosion issues about environmental barrier coatings (EBC) on bulk are discussed. In case of EBC YAG coated A12O3 improved hot gas stability was observed.