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Proceedings Paper

Advices for the use of ZERODUR at higher temperatures
Author(s): Ralf Jedamzik; Thomas Westerhoff
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Paper Abstract

The coefficient of thermal expansion of ZERODUR® is optimized for an application temperature between 0°C to 50°C. Nevertheless ZERODUR® can also be used at other temperatures. It has been shown elsewhere, that ZERODUR® can be used at deep, down to cryogenic temperatures. At higher temperatures, the use of ZERODUR® is restricted by the required accuracy of the coefficient of thermal expansion. As given in the ZERODUR® catalog, the maximum application temperature is 600°C. Slight changes of the CTE may occur if ZERODUR® is cooled down from application temperatures between 130°C and 320°C with rates that differ from the initial production annealing rate. This can be relevant in coating processes that work at temperatures above 130°C. In this paper, the effects of high temperature treatments on ZERODUR® properties are discussed. Advices are given how to avoid material property or geometric changes if heat treatment cannot be avoided.

Paper Details

Date Published: 10 July 2018
PDF: 10 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070634 (10 July 2018); doi: 10.1117/12.2311648
Show Author Affiliations
Ralf Jedamzik, SCHOTT AG (Germany)
Thomas Westerhoff, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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