26 July 1999 Is sapphire inherently weak in compression at high temperatures?
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Abstract
Single crystal sapphire shows a rapid loss of c-axis compressive strength at high temperature. The strength degradation is attributed to the rhombohedral twinning which leads to crack initiation and propagation. This work takes a critical look at the rhombohedral twinning in sapphire via controlled c-axis compression tests. It is shown that surface/subsurface damage due to machining has an important role in controlling the twin initiation process. The removal of the machining damage results in a more than two-fold increase in the compressive strength of sapphire at 600 degrees C.
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Ender Savrun, Cetin Toy, William D. Scott, Daniel C. Harris, "Is sapphire inherently weak in compression at high temperatures?", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354620; https://doi.org/10.1117/12.354620
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