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Thermal Shock Behavior of Single Crystal Oxide Refractive Concentrators for High Temperatures Solar Thermal PropulsionSingle crystal oxides such as yttria-stabilized zirconia (Y2O3-ZrO2), yttrium-aluminum-garnet (Y3Al5O12, or YAG), magnesium oxide (MgO) and sapphire (Al2O3) have been considered as refractive secondary concentrator materials for high temperature solar propulsion applications. However, thermal mechanical reliability of the oxide components in severe thermal environments during space mission sun/shade transitions is of great concern. In this paper, critical mechanical properties of these oxide crystals are determined by the indentation technique. Thermal shock resistance of the oxides is evaluated using a high power CO, laser under high temperature-high thermal gradients. Thermal stress fracture behavior and failure mechanisms of these oxide materials are investigated under various temperature and heating conditions.
Document ID
20010017224
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Zhu, Dongming
(NASA Lewis Research Center Cleveland, OH United States)
Choi, Sung R.
(NASA Lewis Research Center Cleveland, OH United States)
Jacobson, Nathan S.
(NASA Lewis Research Center Cleveland, OH United States)
Miller, Robert A.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 1999
Publication Information
Publication: Ceramic Engineering and Science Proceedings
Publisher: The American Ceramic Society
Volume: 20
Issue: 4
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Other

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