Chapter 34. Lanthane Aluminate Thermal Barrier Coating

  1. Ersan Ustundag and
  2. Gary Fischman
  1. G. W. Schafer and
  2. R. Gadow

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294574.ch34

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4

How to Cite

Schafer, G. W. and Gadow, R. (1999) Lanthane Aluminate Thermal Barrier Coating, in 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4 (eds E. Ustundag and G. Fischman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294574.ch34

Author Information

  1. Institute for Manufacturing Technologies of Ceramic Components and Composites University of Stuttgart Allmandring 5b D-70569 Stuttgart, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1999

ISBN Information

Print ISBN: 9780470375648

Online ISBN: 9780470294574

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Keywords:

  • alumina;
  • zirconia;
  • platinum;
  • palladium;
  • microcrack

Summary

A newly developed alumina-based ceramic coating consisting of La2O3 Al2O3 and MgO that possesses long term structural and thermochemical stability up to 1400°C is presented. This coating composition ages significantly slower than commercial zirconia based TBCs at these high temperatures. This is achieved through the formation of platelets, preventing a densification of the coating by postsintering. The thermal conductivity at room temperature is λRT = 0.8–2.2 W/mK increasing to λ200 = 1.2–2.6 W/mK at 1200°C, depending on the porosity of the material. The thermal expansion coefficient was measured from room temperature up to 1200°C, it varies from 9.5–10.7–10−6K−1.