Chapter 87. Strength and Fractue Toughness of Ysz/Alumina Composites for Solid Oxide Fuel Cells

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Sung R. Choi and
  2. Narottam P. Bansal

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch87

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Choi, S. R. and Bansal, N. P. (2008) Strength and Fractue Toughness of Ysz/Alumina Composites for Solid Oxide Fuel Cells, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch87

Author Information

  1. NASA Glenn Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • solid-state energy;
  • thermal-expansion;
  • monoclinic;
  • elevated-temperature;
  • surface-connected defects

Summary

The 10-mol % ytrria-stabilized zirconia (10-YSZ) composites reinforced with 0 to 30 mol % of alumina were fabricated via hot pressing. Flexure strength and fracture toughness of the composites were determined at ambient temperature and 1000d̀C in air. Both flexure strength and fracture toughness increased with increasing alumina content, regardless of temperature, reaching a maximum at 30 mol% of alumina. Increased fracture toughness (up to 50 to 65 % at both temperatures) through crack deflection was believed to be responsible for enhanced flexure strength.