Chapter 47. Strengths and Deformation of Single Crystal Oxides at Ambient and Elevated Temperatures for Refractive Solar Concentrator Applications

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Sung R. Choi,
  2. Dongming Zhu and
  3. Robert A. Miller

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch47

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

How to Cite

Choi, S. R., Zhu, D. and Miller, R. A. (2008) Strengths and Deformation of Single Crystal Oxides at Ambient and Elevated Temperatures for Refractive Solar Concentrator Applications, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch47

Author Information

  1. NASA Glenn Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

SEARCH

Keywords:

  • yttrium aluminum garnet;
  • solar concentrator system;
  • thermo mechanical reliability;
  • ooxide solar;
  • cylindrical billets

Summary

Strengths of three different single crystal oxides including sapphire (Al203), yttrium- aluminum-garnet (Y3Al5O12, or YAG) and yttria-stabilized zirconia (Y2O3-ZrO2) were determined in biaxial flexure using a ball-on-ring configuration at both room temperature and 1400°C in air. At a temperature of 1400°C, sapphire exhibited a strength degradation of about 30 % with respect to its room-temperature strength while YAG did a strength increase of about 40 %. The yttria- stabilized zirconia crystal showed a dramatic (creep) deformation at 1400°C, unable to measure appropriate elevated-temperature strength. The trend in hardness for each material as a function of temperature up to 600°C was found to be very similar to that in biaxial strength: hardness increased a little for YAG but decreased for both sapphire and zirconia. As in strength at 1400°C, ziconia exhibited a significant decrease (74 %) in hardness at 600°C.