Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1992-07-06
1993-11-16
Beck, Shrive
Coating processes
With post-treatment of coating or coating material
Heating or drying
427422, 4274432, C23C 2600
Patent
active
052622045
ABSTRACT:
The invention is related to a glass-ceramic article decorated with a ceramic baking finish. A SiO.sub.2 layer, about 20-200 nm thick, is placed between the decoration and the glass-ceramic material. The SiO.sub.2 layer can additionally contain, to match the refractive index to the refractive index of the glass-ceramic, up to 66.5 wt. % of oxides which change the refractive index, in particular TiO.sub.2, ZrO.sub.2, SnO.sub.2, MgO or Al.sub.2 O.sub.3. In the process to produce the decorated glass ceramic article, the SiO.sub.2 layer is preferably produced according to the known sol-gel process. Preferably, an SiO.sub.2 gel layer, optionally precondensed by a brief thermal treatment, is produced on the still-vitreous article. The decoration is applied to this gel layer and afterward the vitreous article is subjected to ceramization. The SiO.sub.2 -gel layer is converted into an SiO.sub.2 layer, and the ceramic color of the decoration is baked-in. The SiO.sub.2 layer permits, above all, the production of substantially "halo"-free decorations with sharp contours.
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Dislich Helmut
Hinz Paul
Scheidler Herwig
Weber Gerhard
Beck Shrive
Dang Vi Duong
Schott Glaswerke
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