Mechanism of mechanical failure of sapphire at high temperature

Daniel C. Harris; Frederick Schmid; John J. Mecholsky Jr.; Y. L. Tsai

doi:10.1117/12.187355

28 September 1994 Mechanism of mechanical failure of sapphire at high temperature

Daniel C. Harris, Frederick Schmid, John J. Mecholsky Jr., Y. L. Tsai

Proceedings Volume 2286, Window and Dome Technologies and Materials IV; (1994) https://doi.org/10.1117/12.187355
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The strength of sapphire decreases more rapidly with increasing temperature than does the strength of polycrystalline alumina and many other ceramics. Twinning on the rhombohedral plane (1102) at elevated temperature induced by compression along the crystallographic c-axis [0001] appears to initiate failure and accounts for the decreased strength. The tensile strength of sapphire along the (alpha) - [1120] or c-axes is constant to within approximately 30% between 20 degree(s) and 800 degree(s)C. Compressive strength along the (alpha) -axis is also constant to within approximately 20%. However, compressive strength along the c-axis falls by > 95% (from 2000 MPa to less than 100 MPa) between 20 degree(s) and 800 degree(s)C.

Citation Download Citation

Daniel C. Harris, Frederick Schmid, John J. Mecholsky Jr., and Y. L. Tsai "Mechanism of mechanical failure of sapphire at high temperature", Proc. SPIE 2286, Window and Dome Technologies and Materials IV, (28 September 1994); https://doi.org/10.1117/12.187355

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available