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10 July 2018 Advice for the use of ZERODUR at higher temperatures
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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.
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Ralf Jedamzik and Thomas Westerhoff "Advice for the use of ZERODUR at higher temperatures", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070634 (10 July 2018); https://doi.org/10.1117/12.2311648
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