Chapter 16. Cathode Thermal Delamination Study for a Planar Solid Oxide Fuel Cell with Functional Graded Properties: Experimental Investigation and Numerical Results

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Gang Ju1,
  2. Kenneth Reifsnider1 and
  3. Jeong-Ho Kim2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch16

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

Ju, G., Reifsnider, K. and Kim, J.-H. (2006) Cathode Thermal Delamination Study for a Planar Solid Oxide Fuel Cell with Functional Graded Properties: Experimental Investigation and Numerical Results, 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.ch16

Author Information

  1. 1

    Department of Mechanical Engineering, University of Connecticut, Storrs, CT, 06269

  2. 2

    Department of Civil & Environmental Engineering, University of Connecticut, Storrs, CT, 06269

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:

  • electrolyte;
  • temperature;
  • microindentation;
  • zirconia;
  • thermoelastic

Summary

Solid oxide fuel cell in nature acts as a functional ceramic material for power conversions. Three-layer formation of electrolyte, cathode and anode system, or five- layer formation that is consisted of two more barrier layers between electrolyte and electrodes, usually exhibits bimaterial properties with discontinuities in elastic modulus, coefficient of thermal expansion (CTE), and thermal conductivity. Due to relatively lower sintering temperature, cathode can delaminate during the in-service operation. 10 mol% scandia stabilized zirconia (10ScSZ) and 10 mol% scandia stabilized zirconia (6ScSZ) electrolytes were investigated for elastic properties, hardness and fracture toughness by nanoindentation together with microindentation techniques. Interfacial energy release rate for lanthanum strontium ferrite (LSF) cathode: 6ScSZ electrolyte was determined experimentally. 2-D Thermal fracture of mechanically functional graded material (FGM) system including cathode and electrolyte is studied numerically with considering spatially continuous and temperature dependent material properties. The thermal stress intensity factors, and strain energy release rate were compared for both conventional bimaterial system and functional graded material experiencing uniform temperature change, as well as locally exponential varying temperature change.