Chapter 89. Laybo3, A Candidate for Thermal Barrier Coating Materials

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Markus Dietrich,
  2. Robert Vaßen and
  3. Detlev Stöver

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch89

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

How to Cite

Dietrich, M., Vaßen, R. and Stöver, D. (2003) Laybo3, A Candidate for Thermal Barrier Coating Materials, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294802.ch89

Author Information

  1. Institut für Werkstoffe und Verfahren der Energietechnik (IWV1), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375839

Online ISBN: 9780470294802

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Keywords:

  • sic coated diamond;
  • titanium metals;
  • silicon powder;
  • carbon felts;
  • thermogravity measurement

Summary

LaYbO3 is a perovskite type ceramic material with a high melting point. It was investigated as a potential material for thermal barrier coatings at temperatures >1300°C. After its synthesis, sintered bodies were produced and the thermal properties of these bodies were measured. Observations during sintering indicate that LaYbO3 has a promising low sintering activity. Long-term annealing tests showed phase stability of the perovskite from room temperature to temperatures above 1300°C. The thermal expansion coefficient is lower than that of yttria stabilized zdrconia (YSZ). The thermal conductivity is more temperature-dependent than that of YSZ, but much lower at the temperature of interest 1200°C. Microindentation measurement showed a lower Young's modulus and a lower hardness of the LaYbO3 compared to YSZ. Free flowing LaYbO3 powder was developed for plasma spraying. Plasma-sprayed coatings were produced and characterized. During thermal cycling, coated samples failed very early. During the experiments it was revealed that LaYbO3 is soluble in HC1.