22 August 2009 ZERODUR® glass ceramics for high stress applications
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Proceedings Volume 7425, Optical Materials and Structures Technologies IV; 74250M (2009); doi: 10.1117/12.828033
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States
Abstract
Recently SCHOTT has shown in a series of investigations the suitability of the zero expansion glass ceramic material ZERODUR® for applications like mirrors and support structures of complicated design used at high mechanical loads. Examples are vibrations during rocket launches, bonded elements to support single mirrors or mirrors of a large array, or controlled deformations for optical image correction, i.e. adaptive mirrors. Additional measurements have been performed on the behavior of ZERODUR® with respect to the etching process, which is capable of increasing strength significantly. It has been determined, which minimum layer thickness has to be removed in order to achieve the strength increase reliably. New data for the strength of the material variant ZERODUR K20® prepared with a diamond grain tool D151 are available and compared with the data of ZERODUR® specimens prepared in the same way. Data for the stress corrosion coefficient n of ZERODUR® for dry and normal humid environment have been measured already in the 1980s. It has been remeasured with the alternative double cleavage drilled compression (DCDC) method.
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Peter Hartmann, Kurt Nattermann, Thorsten Döhring, Ralf Jedamzik, Markus Kuhr, Peter Thomas, Guenther Kling, Stefano Lucarelli, "ZERODUR® glass ceramics for high stress applications", Proc. SPIE 7425, Optical Materials and Structures Technologies IV, 74250M (22 August 2009); doi: 10.1117/12.828033; http://dx.doi.org/10.1117/12.828033
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KEYWORDS
Etching

Zerodur

Failure analysis

Mirrors

Surface finishing

Glasses

Humidity

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