Chapter 79. Mixed-Mode Fracture of Plasma-Sprayed Thermal Barrier Coatings at Ambient and Elevated Temperatures

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Sung R. Choi,
  2. Dongming Zhu and
  3. Robert A. Miller

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch79

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., Zhu, D. and Miller, R. A. (2003) Mixed-Mode Fracture of Plasma-Sprayed Thermal Barrier Coatings at Ambient and Elevated Temperatures, 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.ch79

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:

  • thermal barrier coating;
  • finite element method;
  • thermal cycle damage;
  • low pressure plasma spray;
  • yttria stabilized zirconia

Summary

Mixed-mode fracture behavior of plasma-sprayed Zr02-8 wt% Y2O3 thermal barrier coatings was determined in air at 25 and 1316°C using an asymmetric four-point flexure in conjunction with the single edge v-notched beam (SEVNB) test specimens. Mode I fracture toughness was found to be Klc=1.15±0.07 and 0.98±0.13 MPaVm, respectively, at 25 and 1316°C; whereas respective mode II fracture toughness was KnHc=0.73±0.10 and 0.65±0.04 MPaVm. The ratio of mode I to mode II fracture toughness was KnHc/KIc=0.65 at both temperatures. The empirical mixed-mode fracture criterion well described the coatings' mixed-mode fracture behavior among the four mixed-mode fracture theories considered.