Schott Ag

Schott Glas

Klaus Schoenberger

Friedrich Siebers

Ulrich Schiffner

Evelin Weiss

Wolfgang Schmidbauer

Bernd Schultheis

Frank-Thomas Lentes

Christian Mueller

Falk Gabel

Karin Naumann

Waldemar Weinberg

Roland Dudek

Ioannis Kosmas

Monica Cotlear De Witzmann

Udo Jakob

Matthias Stubenrauch

Horst Blei

Reiner Best

Eckhart Doering

Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Transparent, dyed cook top or hob with improved colored display capability and a method for the manufacturing of such a cook top or hob

A method for producing bubble-free glasses is provided, in which a glass mixture that is arsenic-free, antimony-free and tin-free with the exception of any unavoidable raw material impurities and at least one sulfate compound as a refining agent are used. The glass mixture and refining agent are melted and primarily refined in a first region of a melting tank, an average melting temperature (T1) is set at T1&#x3e;1580&#xb0; C. and an average melt residence time (t1) is set at t1&#x3e;2 hours. A secondary refinement is carried out in a second region, an average melting temperature (T2) is set at T2&#x3e;1660&#xb0; C. and an average melt residence time (t2) is set at t2&#x3e;1 hour, and the proportion of the SOresulting from decomposition of the sulfate is reduced to less than 0.002 wt. %.

Method for producing glasses, glass ceramics and the use of same

Transparent or transparent dyed lithium aluminum silicate (LAS) glass ceramic material is provided that has an adapted thermal expansion. The material includes high-quartz mixed crystals as the predominant crystalline phase, and a thermal expansion between room temperature and 700&#xb0; C. from 1.0 to 2.5&#xb7;10/K.

Transparent or transparent colored lithium aluminum silicate glass ceramic articles having adapted thermal expansion and use thereof

A transparent low-colour lithium aluminium silicate (LAS) glass ceramic and the use thereof are provided. The ceramic has an environmentally friendly composition with high-quartz mixed crystals as the main crystal phase. The glass ceramic contains the following components (in wt % on the basis of oxide): TiO1.6-&#x3c;2.5; NdO0.005-0.15; MgO 0.2-1.0; ZnO 1-2.5; CaO+SrO 0-1.5; BaO 0-1.5 with the condition B1: MgO+ZnO&#x3e;CaO+SrO +BaO. In some embodiments, the glass ceramic has a hue c* of less than 5.5, a light transmission Y greater than 81% and has no visually disruptive diffusion.

Transparent low-color lithium aluminum silicate glass ceramic and the use thereof

The method of environmentally friendly melting and refining a glass melt of a crystallizable glass, which is used for making a lithium aluminum silicate (LAS) glass ceramic, includes the steps of providing a glass batch with a main batch composition within a lithium aluminum silicate (LAS) glass system, in which 0.1-&#x3c;0.6% by weight of tin oxide has been added as main refining agent, but which does not contain arsenic oxide and/or antimony oxide as refining agent, formulating a raw material mixture for the glass batch, so that less than 40% by weight of the raw material mixture is quartz sand and then refining a glass melt formed from the glass batch at temperatures of at least 1600&#xb0; C.

Method of environmentally friendly melting and refining of a glass melt for a crystallizable glass of a lithium aluminium silicate (LAS) glass ceramic

The cooking panel is made from an opaque glass-ceramic material uniformly colored throughout and having keatite mixed crystals as the predominant crystalline phase. The cooking panel is made by ceramicizing a ceramicizable glass or a transparent glass-ceramic with high quartz mixed crystals as the predominant crystalline phase in a definite color location range with a brightness parameter value (L*) less than 85 and a color shade and chromaticity according to its later service and wear pattern. The cooking panel makes deposited material, such as dirt and the like, less conspicuous.

Glass-ceramic cooking panel that makes deposited material, such as dirt, less conspicuous

Growing community of inventors

Mainz, Germany

Klaus Schoenberger