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Proceedings Paper

Strength of sapphire as a function of temperature and crystal orientation
Author(s): John W. Fischer; W. R. Compton; Nancy A. Jaeger; Daniel C. Harris
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Paper Abstract

The strengths of sapphire disks of two different crystallographic orientations and bars of three different orientations were measured as a function of temperature in ring-on- ring flexure or 4-point bending. One set of disks (OO cut) had the crystallographic C -axis normal to the flat surface which contained the crystallographic a- and m -axes. The average strength of these disks dropped from 154 ksi at 20°C to 21 ksi at 800°C. In another set of disks (900 cut), the crystallographic c- and m -axes were parallel to the flat surface. The average strength of these disks dropped from 84 ksi at 20°C to 48 ksi at 800°C. The strength of sapphire bars whose tensile axis was the crystallographic m axis dropped from 103 ksi at 20°C to 86 ksi at 1400°C. The strength of sapphire bars whose tensile axis was the crystallographic a-axis dropped from 113 ksi at 20°C to 74 ksi at 1400°C. The strength of sapphire bars whose tensile axis was the crystallographic c-axis dropped from 153 ksi at 20°C to 35 ksi at 1400°C.

Paper Details

Date Published: 1 October 1990
PDF: 12 pages
Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); doi: 10.1117/12.22477
Show Author Affiliations
John W. Fischer, Naval Weapons Ctr. (United States)
W. R. Compton, Naval Weapons Ctr. (United States)
Nancy A. Jaeger, Naval Weapons Ctr. (United States)
Daniel C. Harris, Naval Weapons Ctr. (United States)


Published in SPIE Proceedings Vol. 1326:
Window and Dome Technologies and Materials II
Paul Klocek, Editor(s)

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