Schott Ag

Schott Glas

Schott Glaswerke

Otmar Becker

Friedrich Siebers

Michael Bug

Franz Ott

Karin Naumann

Peter Nass

Falk Gabel

Harald Striegler

Gerhard Hahn

Roland Leroux

Dietmar Wennemann

Guenther Siebenhaar

Thomas Schuler

Wolfgang Schmidbauer

Andreas Langsdorf

Ina Mitra

Erich Rodek

Bernd Ruedinger

Veit Luther

Thoralf Johansson

Petra Grewer

Jan-Peter Ortmann

Christian Roos

Andreas Schminke

Michael Glasenapp

Edgar Pawlowski

Evelin Weiss

Waldemar Weinberg

Doris Moseler

Klaus Kristen

Volker Seibert

Gerhard Lautenschläger

Helga Goetz

Friedrich-Georg Schroeder

Ralf Diezel

Roland Dudek

Jurgen Thurk

Sabine Melson

Ioannis Kosmas

Cora Krause

Klaus Schönberger

Axel Ohlinger

Dietrich Busch

Martin Mueller

Niko Schultz

Volker Scheumann

Bernd Rüdinger

Manfred Borens

Fritz Schroeder

Bernd Rudinger

Oliver Gros

Friedrich-Georg Schroder

Jutta Reichert

Rainer Best

Dan Haines

Samuel D Conzone

Markus Heiss

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 low-expansion glass ceramic plate, in which a black coating is applied directly or indirectly to at least some areas of at least one side of the plate and the coating contains precious metal. In order to produce a glass ceramic plate of this type that is opaque, while simultaneously retaining a sufficient degree of its thermal stability, according to this invention, the precious metal content in the coating is &#x2267;50 wt. %, the bismuth oxide content in the coating is at most 20 wt. %, and the layer thickness of the coating is at least 200 nm.

Glass ceramic plate

The invention relates to an arrangement for fluorescence amplification including a substrate, a fluorescence amplifier coating applied to the substrate, and a thin fluorescencable material which lies on the coating and emits light with the emission wavelength &#x3bb;when it is exposed to excitation light of an excitation wavelength &#x3bb;. The fluorescence amplifier coating includes an interference layer system of high-index and low-index dielectric layers, which reflects at least the excitation light. What is crucial for the design of the coating is that the fluorescencable material applied to the coating is arranged on the surface of the coating in the region of the maximum of the electric field amplitude of the standing wave with the excitation wavelength &#x3bb;, which is formed during exposure to the excitation light.

Arrangement for fluorescence amplification

The method produces a glass-ceramic article substantially in the form of a plate with improved high temperature difference resistance or strength. The glass-ceramic article contains keatite mixed crystals (KMK) or high quartz mixed crystals (HQMK) as well as the keatite mixed crystals (KMK). The method includes heating a glass-ceramic in a high quartz mixed crystal state to form the keatite mixed crystals with a heating rate of 20 K/min to 150 K/min, preferably more than 15 K/min, especially preferably more than 20 K/min. These high heating rates increase the temperature difference resistance.

Method of making a glass-ceramic article

This invention relates to a flat float glass that can be prestressed or transformed into a glass ceramic with high quartz mixed crystals or keatite mixed crystals. To eliminate undesirable surface defects during floating and to achieve superior characteristics of the glass or of the glass ceramic, in particular with regard to a low coefficient of thermal expansion and high light transmittance, the glass has a concentration of less than 300 ppb Pt, less than 30 ppb Rh, less than 1.5 wt. % ZnO and less than 1 wt. % SnO, and is refined during melting without the use of the conventional fining agents arsenic oxide and/or antimony oxide.

Flat float glass

The process of the invention produces alkali-free aluminosilicate glass having an AlO-content of more than 12% by weight with the addition of from 0.005% by weight to 0.6% by weight of sulfate for batch formulation.

Process for producing alkali-free aluminosilicate glass

The support plate for transporting products during thermal treatment at firing temperatures is a nonporous keatite glass ceramic supporting member without a glassy surface layer. It has a nubby structure on an underside thereof and preferably C-shaped rounded edges. A method of making the keatite glass ceramic supporting member is described.

Nonporous keatite glass ceramic support plate for transporting products during heat treatment, method of making same and method of transporting products therewith

The invention relates to a method for producing aluminosilicate glass that is devoid of alkali and that has a BOcontent of between 0 and &#x3c;5 wt.-% and a BaO content in excess of 5.5 wt.-%. Said method is characterised by the addition of between 0.05 wt.-% and 1.0 wt.-% SnOduring the preparation of the mixture.

Method for producing aluminosilicate glass

The present invention generally relates to a method of making halogen lamps and halogen lamp bulbs, as well as other analogous lamps and objects. The present invention also relates to apparatus used in a method of making halogen lamps and halogen lamp bulbs, as well as other analogous lamps and objects. The method minimizes contamination in the body of the glass and minimizes reaction of lamp halogen with the interior of a halogen lamp.

Method of making a halogen lamp and other analogous lamps and objects, and apparatus for the manufacture thereof

This invention relates to a flat float glass that can be prestressed or transformed into a glass ceramic with high quartz mixed crystals or keatite mixed crystals. To eliminate undesirable surface defects during floating and to achieve superior characteristics of the glass or of he glass ceramic, in particular with regard to a low coefficient of thermal expansion and high light transmittance, the glass has a concentration of less than 300 ppb Pt, less than 30 ppb Rh, less than 1.5 wt. % ZnO and less than 1 wt. % SnO, and is refined during melting without the use of the conventional fining agents arsenic oxide and/or antimony oxide.

The invention relates to lead- and cadmium-free glass for glazing, enamelling and decorating glasses or glass-ceramics which have a low coefficient of thermal expansion of less than 2&times;10 /K, having the composition (in % by weight) 0-6 Li O, 0-5 Na O, 0 to less than 2 K O, where the sum Li O&plus;K &plus;Na O is between 2 and 12, 0-4 MgO, 0-4 CaO, 0-4 SrO, 0-1 BaO, 0-4 ZnO, 3 to less than 10 Al O , 13-23 B O , 50-65 SiO , 0-4 TiO , 0-4 ZrO and 0-4 F, as replacement for oxygen and containing up to 30% by weight of a pigment which is resistant at the firing temperature, where the glass is suitable for glazing, enamelling and decoration in both primary and secondary firing, and both the full-area and sparse glaze, enamel or decoration layers have low abrasion susceptibility after firing, and it relates to processes for the production of a glass-ceramic coated therewith.

Cooking surface for cooking food having a glass ceramic surface with a glass coating thereon

There is disclosed a stove, with a smooth-top cooktop, for cooking food, the stove comprising: a stove body; a smooth-top cooktop to cook food thereon; and at least one heat source disposed adjacent to a cooking surface of said cooktop. The cooktop comprises glass ceramic with an upper layer and an inner layer, with the upper layer comprising a different glass ceramic material than the inner layer. The upper layer is configured to minimize surface defects such as fissures, cracks, pits, and pores. The inner layer is configured to provide resistance to impact to the upper layer from cooking utensils being dropped onto the upper layer of the smooth-top cooktop, and at least the inner layer of the glass ceramic being configured to obscure visibility of the at least one heat source, through the upper layer of the glass ceramic.

COOKING STOVE HAVING A SMOOTH-TOP GLASS CERAMIC COOKTOP, AND A SMOOTH-TOP GLASS CERAMIC COOKTOP WITH A GLASS CERAMIC COOKTOP COOKING SURFACE, METHOD FOR PRODUCTION OF STOVES WITH SMOOTH-TOP GLASS CERAMIC COOKTOPS AND SMOOTH-TOP GLASS CERAMIC COOKTOPS

The invention is directed to an aluminosilicate glass containing alkaline earth metals for lamp bulbs which have molybdenum components and bulb temperatures of greater than 650.degree. C. The glass has a composition in percent by weight on oxide basis as follows: SiO.sub.2 &gt;58-62; Al.sub.2 O.sub.3 15-17.5; B.sub.2 O.sub.3 0.2-0.7; MgO 0-&lt;1; CaO 5.5-14; SrO 0-8; BaO 6-10; ZrO 0.05-1.0; CeO.sub.2 0-0.3; TiO.sub.2 0-0.5; Br.sup.- 0-0.6 where .SIGMA. RO 21-24; (MgO+CaO+SrO)/BaO 1.45-1.75; and an alkali metal content of &lt;0.03% by weight and a water content of &lt;0.02% by weight.

Glass for lamb bulbs capable of withstanding high temperatures

The invention is directed to a method of producing a chemically pretensioned glass body. In the method, a glass body is provided having a composition in percent by weight on oxide basis: SiO.sub.2 70-85; B.sub.2 O.sub.3 8-15; Na.sub.2 O 1-5; K.sub.2 O 1-&lt;5; Al.sub.2 O.sub.3 1-5; MgO 0-3; SrO+BaO 0-2; CaO 0-3; ZnO 0-3; with CaO+ZnO 2-6; and, ZrO.sub.2 0-3.5. The glass body is placed in an ion exchange salt bath containing at least 90% by weight of potassium salts. The salt bath is maintained at a temperature below the transformation point Tg of the glass defined by the glass composition for a duration of at least 2.0 hr causing potassium ions from the salt bath to migrate into the surface region of the glass body to thereby produce the chemically pretensioned glass body.

Method for producing a chemically pretensioned glass body

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Langen, Germany

Otmar Becker