Chapter 21. Determination of Thermal Conductivity of Single Crystal Oxides Using a Steady-State Laser Heat Flux Approach

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

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch21

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Zhu, D., Choi, S. R., Jacobson, N. S. and Miller, R. A. (2000) Determination of Thermal Conductivity of Single Crystal Oxides Using a Steady-State Laser Heat Flux Approach, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch21

Author Information

  1. NASA John H. Glenn Research Center 21000 Brookpark Road, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • sicisic composites;
  • crack propagation behavior;
  • computer simulation;
  • silicon carbide fiber;
  • interface elements

Summary

Single crystal oxides such as Y2O3-ZrO2, YAG, and Al2O3 are candidate refractive secondary concentrator materials for high temperature solar thermal propulsion applications. In this study, thermal conductivity data of these single crystal oxides were obtained at high temperatures using a steady-state laser heat flux technique. The steady-state laser thermal conductivity rig was initially developed for ceramic coating conductivity measurements, and it was also feasible for the oxide crystal conductivity testing. During the test, uniformly distributed heat flux from a high power laser was delivered to the oxide surface, and one-dimensional (one-D) steady-state heating was achieved by using thin disk specimen configurations (1–3 mm in thickness) and the backside air cooling. Temperature gradients across the specimen system were carefully measured by surface and back pyrometers. The radiation heat loss and laser absorption corrections of the oxide materials were considered by evaluating their total emissivity and reflectivity. The thermal conductivity data, combined with the thermomechanical property information, are of great importance in solar concentrator component design.