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Proceedings Paper

Weibull statistical analysis of sapphire strength improvement through chemomechanical polishing
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Paper Abstract

Signifigant enhancements of the flexural strength of a- and c- plane sapphire by means of "super polishing" was first reported be McHargue and Snyder [Proc. SPIE 2013, 135 (1993)]. The improvement was attributed to the removal of residual mechanical polishing damage. More recently, a comprehensive series of eperiements was carried out by Crystal Systems for the specific purpose of assessing the effects of various polishing procedures on the high-temperature strength of c-plane sapphire. Subsequent testing at room temperature confirmed that chemomechanical polishing improves both the effective strength and the strength distriution. In this contribution we take advantage of the methodology previously used by Klein et al. [Opt. Eng. 41, 3151 (2002)] to perform a correct Weibull statistical analysis of biaxial flexure-strength data genenrated in the course of Crystal Systems' investigations. We demonstrate that chemomechanical polishing procedures can improve the high-temperature characteristic strength of c-plane sapphire by 150% and the room-temperature Weibull modulus by 100%.

Paper Details

Date Published: 18 May 2005
PDF: 13 pages
Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); doi: 10.1117/12.603271
Show Author Affiliations
Claude A. Klein, c.a.k. analytics, international (United States)
Frederick Schmid, Crystal Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 5786:
Window and Dome Technologies and Materials IX
Randal W. Tustison, Editor(s)

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