7 December 1992 Sol-gel-derived thick coatings and their thermomechanical and optical properties
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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.
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Martin Mennig, Martin Mennig, Gerhard Jonschker, Gerhard Jonschker, Helmut K. Schmidt, Helmut K. Schmidt, } "Sol-gel-derived thick coatings and their thermomechanical and optical properties", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132007; https://doi.org/10.1117/12.132007

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