Strength of sapphire as a function of temperature and crystal orientation

John W. Fischer; W. R. Compton; Nancy A. Jaeger; Daniel C. Harris

doi:10.1117/12.22477

1 October 1990 Strength of sapphire as a function of temperature and crystal orientation

John W. Fischer, W. R. Compton, Nancy A. Jaeger, Daniel C. Harris

Proceedings Volume 1326, Window and Dome Technologies and Materials II; (1990) https://doi.org/10.1117/12.22477
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

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.

Citation Download Citation

John W. Fischer, W. R. Compton, Nancy A. Jaeger, and Daniel C. Harris "Strength of sapphire as a function of temperature and crystal orientation", Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); https://doi.org/10.1117/12.22477

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