23 July 2008 ZERODUR glass ceramics: strength data for the design of structures with high mechanical stresses
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Abstract
With an increasing number of applications mirrors and support structures made of the zero expansion glass ceramic material ZERODUR® has to endure high mechanical loads, e.g. rocket launches or controlled deformations for optical image correction. Like for other glassy materials, the strength of glass ceramics is dominated by its surface condition. Test specimens have been ground with fine grain tools (e.g. D64 diamond grains) and / or subsequently etched. The strength data basis for the design of highly stressed structures has been extended and new information has been derived for the extrapolation to low failure probabilities.
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Peter Hartmann, Kurt Nattermann, Thorsten Döhring, Markus Kuhr, Peter Thomas, Guenther Kling, Peter Gath, Stefano Lucarelli, "ZERODUR glass ceramics: strength data for the design of structures with high mechanical stresses", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180P (23 July 2008); doi: 10.1117/12.788854; http://dx.doi.org/10.1117/12.788854
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KEYWORDS
Nanoimprint lithography

Etching

Surface finishing

Ceramics

Diamond

Glasses

Failure analysis

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