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Proceedings Paper

Sol-gel-derived thick coatings and their thermomechanical and optical properties
Author(s): Martin Mennig; Gerhard Jonschker; Helmut K. Schmidt
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Paper Abstract

The preparation of crackfree and transparent SiO2 coatings on soda lime glass with thicknesses of about 8 micrometers after densification at 500 degree(s)C is presented. The high thickness can be obtained by using an 80:20 mixture of methyltriethoxysilane and tetraethyl orthosilicate as alkoxide precursors in combination with an aqueous colloidal SiO2 sol with particle sizes of about 7 nm. This principle of synthesis is also applied to ZrO2 containing coatings yielding to thicknesses of about 3 micrometers . Refractive index measurements indicate that the coatings are nearly completely densified. At higher temperatures tensile stresses appear within the layers and are transmitted to the substrate, increasing its thermal stability.

Paper Details

Date Published: 7 December 1992
PDF: 10 pages
Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132007
Show Author Affiliations
Martin Mennig, Institut fuer Neue Materialien GmbH (Germany)
Gerhard Jonschker, Institut fuer Neue Materialien GmbH (Germany)
Helmut K. Schmidt, Institut fuer Neue Materialien GmbH (Germany)

Published in SPIE Proceedings Vol. 1758:
Sol-Gel Optics II
John D. Mackenzie, Editor(s)

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