Chapter 47. Strengths and Deformation of Single Crystal Oxides at Ambient and Elevated Temperatures for Refractive Solar Concentrator Applications
- Todd Jessen,
- Ersan Ustundag
Published Online: 28 MAR 2008
DOI: 10.1002/9780470294635.ch47
Copyright © 2000 The American Ceramic Society
Book Title
24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4
Additional Information
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
Publication History
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 2000
Book Series:
ISBN Information
Print ISBN: 9780470375693
Online ISBN: 9780470294635
- Summary
- Chapter
- References
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.