Chapter 37. Effect of Thermal Cycling and Thermal Aging on the Mechanical Properties of, and Residual Stresses in, Ni-YSZ/YSZ Bi-Layers

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. E. Lara-Curzio,
  2. M. Radovic,
  3. R. M. Trejo,
  4. C. Cofer,
  5. T. R. Watkins and
  6. K. L. More

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch37

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

How to Cite

Lara-Curzio, E., Radovic, M., Trejo, R. M., Cofer, C., Watkins, T. R. and More, K. L. (2006) Effect of Thermal Cycling and Thermal Aging on the Mechanical Properties of, and Residual Stresses in, Ni-YSZ/YSZ Bi-Layers, in Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4 (eds N. P. Bansal, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291337.ch37

Author Information

  1. Metals and Ceramics, Oak Ridge National Laboratory Oak Ridge, TN 37831-6069

Publication History

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

ISBN Information

Print ISBN: 9780470080542

Online ISBN: 9780470291337

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Keywords:

  • thermal;
  • electrodes;
  • micrographs;
  • orthogonal;
  • profilometer

Summary

In this paper we report the effect of thermal cycling, between 20 °C and 800 °C in a gas mixture of 4% H2 and 96%Ar, on the physical and mechanical properties of Ni-YSZ/YSZ bilayers. It was found that the porosity and Young's modulus of the bi-layers did not change significantly after thermal cycling. However, the characteristic biaxial strength, as determined by the ring-on-ring test method, was found to decrease by as much as 15% after 1250 thermal cycles. Similar trends were observed from the evaluation of test specimens that had been thermally aged in a similar environment at 800 °C for 625 hours. It was also found that the magnitude of the compressive residual stress in the YSZ layer changes significantly during thermal cycling and aging. Potential mechanisms responsible for this behavior are discussed.