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Proceedings Paper

Transparent sintered sub-µm Al2O3 with IR transmissivity equal to sapphire
Author(s): Andreas Krell; Guenter M. Baur; Claus Dahne
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Paper Abstract

New grades of sintered (polycrystalline) corundum ceramics have been shown to exhibit a ballistic shielding power close to SiC/B4C composites when manufactured with a grain size of about 500 nm. It is demonstrated here that these Al2O3 ceramics become transparent when their residual porosity is decreased to less than 0.05 %. Specifically, in the IR range between about 2 and 6 μm their transmissivity equals that of sapphire approaching the upper theoretical limit for wavelengths of 2.5-4.5 μm. This opens the way to new possible applications such as IR domes. These optically and mechanically homogeneous ceramics can be manufactured with a wall thickness up to 15 mm by a wet casting approach. The technology enables the manufacture of complex hollow spheres which after sintering are transparent in visible light without polishing.

Paper Details

Date Published: 26 September 2003
PDF: 9 pages
Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.485770
Show Author Affiliations
Andreas Krell, Fraunhofer-Institut fur Keramische Technologien und Sinterwerkstoffe (Germany)
Guenter M. Baur, Bodenseewerk Geratetechnik GmbH (Germany)
Claus Dahne, Bodenseewerk Geratetechnik GmbH (Germany)

Published in SPIE Proceedings Vol. 5078:
Window and Dome Technologies VIII
Randal W. Tustison, Editor(s)

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