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Proceedings Paper

Increase of high-temperature strength of sapphire by polishing, heat treatments, and doping
Author(s): Frederick Schmid; Chandra P. Khattak; Keil A. Schmid; Svetlana G. Ivanova; Daniel C. Harris
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Paper Abstract

Various ways to increase the 600C strength of sapphire were explored, including heat treatments, doping and improvement of fabrication techniques. Different grinding and polishing procedures were performed on sapphire disks and compression specimens. Measured strength showed correlation with fabrication procedures, with less aggressive, multi-step processes resulting in the highest strength. Simple heat treatments in oxidizing atmosphere significantly improve both compressive and biaxial flexure strength of sapphire. MgO doping was found to be very effective in increasing the compressive strength of sapphire when combined with the heat treatment.

Paper Details

Date Published: 25 October 2000
PDF: 9 pages
Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); doi: 10.1117/12.405303
Show Author Affiliations
Frederick Schmid, Crystal Systems, Inc. (United States)
Chandra P. Khattak, Crystal Systems, Inc. (United States)
Keil A. Schmid, Crystal Systems, Inc. (United States)
Svetlana G. Ivanova, Crystal Systems, Inc. (United States)
Daniel C. Harris, Naval Air Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 4102:
Inorganic Optical Materials II
Alexander J. Marker III; Eugene G. Arthurs, Editor(s)

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