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Experiments aimed at improving the physical properties of transparent polycrystalline lanthanastrengthened
yttria (LSY) infrared windows and domes were conducted. The objective was to enhance the
thermal shock resistance for aggressive aerothermal environments. The approach included improving the
average equibiaxial flexure strength, Weibull modulus, and other relevant physical properties. Initial
results of an extensive study on polishing and post-fabrication treatment along with improved powder
processing showed an -30% strength improvement without sacrifice in optical properties, leading to an
appreciable increase in the calculated survivability. LSY with a low lanthana content significantly enhanced
predicted survivability.
George C. Wei,Marina R. Pascucci,E. A. Trickett,S. Natansohn, andWilliam H. Rhodes
"Enhancement in aerothermal shock survivability of lanthana-strengthened yttria windows and domes", Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); https://doi.org/10.1117/12.22479
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George C. Wei, Marina R. Pascucci, E. A. Trickett, S. Natansohn, William H. Rhodes, "Enhancement in aerothermal shock survivability of lanthana-strengthened yttria windows and domes," Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); https://doi.org/10.1117/12.22479