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Proceedings Paper

Transparent ceramics for spacecraft windows
Author(s): Jonathan A. Salem
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Paper Abstract

The mechanical properties of several transparent ceramics were investigated to determine if their use might lighten next generation spacecraft windows. The measured fracture toughness and slow crack growth parameters were used as inputs to functions describing the required mass for a desired window life. Transparent magnesium aluminate (spinel, MgAlO4) and AlON exhibit superior slow crack resistance relative to fused silica, which is the historical material of choice. For spinel, slow crack growth, strength and fracture toughness are significantly influenced by the grain size, and alumina rich phases and porosity at the grain boundaries lead to intergranular fracture in coarse grain spinel. The results imply that transparent ceramics can lighten window panes from a slow crack growth perspective.

Paper Details

Date Published: 4 June 2013
PDF: 13 pages
Proc. SPIE 8708, Window and Dome Technologies and Materials XIII, 87080A (4 June 2013); doi: 10.1117/12.2016453
Show Author Affiliations
Jonathan A. Salem, NASA Glenn Research Ctr. (United States)

Published in SPIE Proceedings Vol. 8708:
Window and Dome Technologies and Materials XIII
Randal W. Tustison; Brian J. Zelinski, Editor(s)

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