Schott Ag

Petra Grewer

Harald Striegler

Veit Luther

Falk Gabel

Otmar Becker

Dietmar Wennemann

Gerhard Hahn

Helga Goetz

Michael Bug

Friedrich-Georg Schroeder

Thoralf Johansson

Jan-Peter Ortmann

Thomas Schuler

Guenther Siebenhaar

Michael Glasenapp

Friedrich Siebers

Wolfgang Schmidbauer

Lutz Klippe

Erich Rodek

Andrea Anton

Ulrich Schiffner

Klaus Schönberger

Gerhard Weber

Gabriele Roemer-Scheuermann

Thomas Kraus

Helga GÖTZ

Günther Siebenhaar

Friedrich-Georg SCHRÖDER

A lithium-containing, transparent glass-ceramic material is provided. The material has low thermal expansion and has an amorphous, lithium-depleted, vitreous surface zone. The zone is at least 50 nm thick on all sides and encloses a crystalline interior, which has high transmission. The material includes a transition region connecting the zone and the interior.

Transparent lithium glass-ceramic material, production and use thereof

A transparent, colorless lithium-aluminosilicate glass ceramic plate with high-quartz mixed crystals as the prevailing crystal phase, which is provided on one side with an opaque, colored, temperature-stable coating over the entire surface or over the entire surface to a large extent, is described, which has a content of NdOof 40 to 4000 ppm, a Yellowness Index of less than 10% with a 4 mm glass (ceramic) layer thickness, and a variegation of colors of the glass or the glass ceramic in the CIELAB color system of C* of less than 5. The glass ceramic plate preferably has a composition (in % by weight based on oxide) of: LiO 3.0-4.5, NaO 0-1.5, KO 0-1.5, &#x3a3;NaO+KO 0.2-2.0, MgO 0-2.0, CaO 0-1.5, SrO 0-1.5, BaO 0-2.5, ZnO 0-2.5, BO0-1.0, AlO19-25, SiO55-69, TiO1-3, ZrO1-2.5, SnO0-0.4, &#x3a3;SnO+TiO&#x3c;3, PO0-3.0, NdO0.01-0.4, CoO 0.0-0.004.

Transparent glass ceramic plate that has an opaque, colored bottom coating over the entire surface or over part of the surface

A transparent, colorless glass or glass-ceramic panel has a visually dense, high-temperature-stable coating having an organic/inorganic network structure containing filling material particles and a color-imparting pigment. The mechanically stable, visually dense coating has no melt-reaction zone at the surface of the panel, which is coated with the coating, so that it does not impair the panel strength. The inorganic network structure can be made from a SiO-based sol. The coating is made by introducing the color-imparting pigment and the filling material particles into a reactive organic/inorganic network structure; applying the resulting organic/inorganic network structure containing the pigment and the filling material particles to the panel to coat the panel and then burning-in the organic/inorganic network structure with the pigment and the filling material particles under thermal conditions to form the coating with no melt-reaction zone.

Transparent colorless glass or glass-ceramic panel having an optically dense colored coating and method of making same

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Duesseldorf, Germany

Petra Grewer