Chapter 41. High-Temperature Flexure Strength, Fracture Toughness and Fatigue of Zirconia/Alumina Composites

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Sung R. Choi and
  2. Narottam P. Bansal

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch41

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

Choi, S. R. and Bansal, N. P. (2003) High-Temperature Flexure Strength, Fracture Toughness and Fatigue of Zirconia/Alumina Composites, 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.ch41

Author Information

  1. NASA Glenn Research Center, Cleveland, OH 44135

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:

  • yttna-stabilized zirconia;
  • electrolyte materials;
  • alumina;
  • slow crack growth;
  • solid oxide fuel cells

Summary

Various electrolyte materials for solid oxide fuel cells were fabricated by hot pressing 10 mol % yttria-stabilized zirconia (10-YSZ) reinforced with two different forms of alumina -particulates and platelets — each containing 0 to 30 mol % alumina. Flexure strength and fracture toughness of platelet composites were determined as a function of alumina content at 1000°C in air and compared with those of particulate composites determined previously. Elevated-temperature strength and fracture toughness of both composite systems increased with increasing alumina content. For a given alumina content, flexure strength of particulate composites was greater than that of platelet composites at higher alumina contents (>20 mol %) while fracture toughness was greater in platelet composites than in particulate composites, regardless of alumina content. The results of slow crack growth (SCG) testing at 1000°C showed that susceptibility to SCG was greatest with SCG parameter n = 6-8 for both 0 and 30 mol % particulate composites and was least with n = 33 for the 30 mol % platelet composite.