Chapter 42. Flexural and Compressive Strengths, and Room-Temperature Creep/Relaxation Properties of Plasma-Sprayed ZrO2-8 wt % Y2O3

  1. Ersan Ustundag and
  2. Gary Fischman
  1. Sung R. Choi1,
  2. Dongming Zhu2 and
  3. Robert A. Miller2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294567.ch42

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

How to Cite

Choi, S. R., Zhu, D. and Miller, R. A. (1999) Flexural and Compressive Strengths, and Room-Temperature Creep/Relaxation Properties of Plasma-Sprayed ZrO2-8 wt % Y2O3, in 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3 (eds E. Ustundag and G. Fischman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294567.ch42

Author Information

  1. 1

    Cleveland State University, Cleveland, OH 44115

  2. 2

    NASA Lewis Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1999

ISBN Information

Print ISBN: 9780470375631

Online ISBN: 9780470294567

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Keywords:

  • thermal insulation;
  • mechanical;
  • flexural strength;
  • rectangular beam;
  • sintering

Summary

Effect of test rate on elevated-temperature strength for the thick thermal barrier coatings of plasma-sprayed ZrO28 wt % Y2O3 was determined in flexure at 800C in air. The coating material exhibited a strength increase with decreasing test rate, probably due to a sintering-strengthening effect occurring predominantly at the lowest test rate of 3.3×10−4 MPa/s. The flexure-strength data for a total of 20 specimens were found to be a Weibull modulus of 5 and a Weibull median strength of 33 MPa. The uniaxial compressive strength was 245±86 MPa. It was also found that the creep rate of the coating material at room temperature, ranging from 10−9 to 10−10 /s, was insignificant, showing little dependence on applied compressive stress ranging from 7 to 74 MPa.