Schott Ag

Schott Technical Glass Solutions Gmbh

Bernd Ruedinger

Friedrich Siebers

Andreas Langsdorf

Wolfgang Schmidbauer

Bernd Hoppe

Bianca Schreder

Ulrich Lange

Martin Letz

Falk Gabel

Meike Schneider

Otmar Becker

Klaus Schneider

Daniela Seiler

Gerhard Lautenschlaeger

Michael Bug

Michael Jacquorie

Evelin Weiss

Jochen Alkemper

Thomas Pfeiffer

Ina Mitra

Michael Kluge

Erich Rodek

Oliver Hochrein

Mark J Davis

Gerhard Hahn

Martun Hovhannisyan

Ioannis Kosmas

Klaus Schönberger

Hubertus Braun

Martin Mueller

Christian Roos

Maria-Louisa Reich

Fritz Schroeder

Andreas Schminke

Maria-Louisa Aigner

Rainer Best

Lars Mueller

Julian Koch

Ruediger Dietrich

Markus Heiss

A cover glass is provided that includes a silica based glass ceramic with a thickness between 0.4 mm and 0.85 mm. The glass ceramic has a transmittance of more than 80% from 380 nm to 780 nm and a stress attribute selected from: an overall compressive stress (CS) of at least 250 MPa and at most 1500 MPa, a compressive stress at a depth of 30 μm (CS30) from one of the two faces of at least 160 MPa and at most 525 MPa, a depth of the compression layer (DoCL) of at least 0.2 times the thickness and less than 0.5 times the thickness, and any combinations thereof. The glass ceramic has at least one silica based crystal phase having in a near-surface layer a unit cell volume of at least 1% by volume larger than that of a core where the crystal phase has minimum stresses.

Glass-ceramic cover glass, process for production thereof and use thereof, and digital display device comprising such a cover glass

A highly crystalline transparent, translucent or opaque lithium aluminium silicate (LAS) glass-ceramic which has a proportion of residual glass phase of less than 20% by weight and also the use thereof is described.

Highly crystalline lithium aluminium silicate glass-ceramic and its use

The present invention relates to an improved cordierite glass-ceramic. In order to improve the materials properties, it is proposed that the glass-ceramic comprising SiO, AlO, MgO and LiO contains cordierite as main crystal phase and that a secondary crystal phase of the glass-ceramic comprises high-quartz solid solution and/or keatite solid solution. The invention further relates to a process for producing such a glass-ceramic and the use of such a glass-ceramic.

Cordierite glass-ceramic

A glass having excellent resistance against surface damages is provided. The glass includes a content of alkaline earth oxides of at least 0.3% by weight and of POof 0.1 to 4% by weight; the glass has at least one surface that has precipitations with a mean size of 1 to 20 &#x3bc;m. A method is further provided and includes melting a glass batch, yielding a glass melt, and casting the glass melt onto a float bath. The glass melt is maintained on the float bath at a temperature of above 1000&#xb0; C. for at least 5 minutes, and yields glass. The glass has a content of alkaline earth oxides of at least 0.3% by weight and of P2O5 of 0.1 to 4% by weight, and the glass has at least one surface that has precipitations with a mean size of 1 to 20 &#x3bc;m.

Glass having excellent resistance against surface damages and method for the production thereof

A method is described for making a float glass convertible into a glass ceramic, by which a largely crystal fault-free glass can be produced. In this method the glass is cooled from a temperature (T), at which a crystal growth rate is at a maximum value (KG), to another temperature (T), at which practically no more crystal growth occurs, with a cooling rate, KR, in &#xb0; C. minaccording to: wherein &#x394;T=T&#x2212;T, and KGmax=maximum crystal growth rate in &#x3bc;m min. The float glass has a thickness below an equilibrium thickness, a net width of at least 1 m and has no more than 50 crystals with a size of more than 50 &#x3bc;m, especially no crystals with a size of more than 10 &#x3bc;m, per kilogram of glass within the net width.

Method of making a float glass convertible into a glass ceramic and float glass made thereby

A process for the production of a glass-ceramic comprises the following steps:

Glass-ceramic containing nanoscale barium titanate and process for the production thereof

The process of making the glass-ceramic includes ceramicizing a starting glass at a heating or cooling rate during the ceramicization of at least 10 K/min, so that the glass-ceramic contains at least 50% by volume of ferroelectric crystallites with a maximum diameter of from 20 to 100 nm and not more than 10% by volume of nonferroelectric crystallitesis. The glass ceramic produced by the process contains no pores or not more than 0.01% by volume of the pores and a value of e'&#xb7;Vof the glass-ceramic is at least 20 (MV/cm), wherein e&#x2032; is the dielectric constant at 1 kHz and Vis the breakdown voltage per unit thickness. The ferroelectric crystallites preferably have a perovskite structure and are composed of substantially pure or doped BaTiOand/or BaTiO.

Process of producing a glass-ceramic, the glass-ceramic made therby and its uses

A method for making a float glass convertible into a glass ceramic, by which a largely crystal fault-free glass can be produced. In this method the glass is cooled from a temperature (T), at which a crystal growth rate is at a maximum value (KG), to another temperature (T), at which practically no more crystal growth occurs, with a cooling rate, KR, in &#xb0; C. minaccording to: wherein &#x394;T=T&#x2212;T, and KGmax=maximum crystal growth rate in &#x3bc;m min. The float glass has a thickness below an equilibrium thickness, a net width of at least 1 m and has no more than 50 crystals with a size of more than 50 &#x3bc;m, especially no crystals with a size of more than 10 &#x3bc;m, per kilogram of glass within the net width.

Method of making a float glass subsequently convertible into a glass ceramic

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

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

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Woerrstadt, Germany

Bernd Ruedinger