Schott Glas

Schott Ag

Hans-Werner Beudt

Friedrich Siebers

Hartmut Paschke

Wolfgang Schmidbauer

Dietrich Mund

Dirk Sprenger

Klaus Schneider

Susanne Kessler

Michael Jacquorie

Bernd Rüdinger

Gerbard Lautenschläger

Susanne Kiermayer

An optically detectable, floatable arsenic- and antimony-free, glazable lithium-aluminosilicate glass that can be prestressed and the glass ceramic converted therefrom are described. The glass or the glass ceramic has a composition (in % by weight based on oxide) of essentially SiO55-69, AlO19-25, LiO 3.2-5, NaO 0-1.5, KO 0-1.5, MgO 0-2.2, CaO 0-2.0, SrO 0-2.0, BaO 0-2.5, ZnO 0-&#x3c;1.5, TiO1-3, ZrO1-2.5, SnO0.1-&#x3c;1, &#x3a3;TiO+ZrO+SnO2.5-5, PO0-3, NdO0.01-0.6, CoO 0-0.005, F 0-1, BO0-2.

Optically detectable, floatable arsenic- and antimony-free, glazable lithium-aluminosilicate glass

Glass ceramic

The invention relates to a glass powder, where at least one oxidizing agent or one reducing agent is added to the glass powder. The glass powder is preferably used as dental glass powder.

Glass powder and use thereof

An improved filling material for a composite solder glass based on doped PbTiO,is disclosed, in which up to 35 atom % of the Pb atoms and up to 35% Ti atoms are replaced by Mg and/or Ca and a portion of O atoms in the doped PbTiO,is replaced with halogen atoms, preferably fluorine atoms. This filling material and composite solder glasses containing it are useful for hermetic sealing, soldering and/or coating of individual components made of glass material, glass-ceramic material, ceramic material and metal in the manufacturing of components and devices for electrical engineering and electronics, for hermetic encapsulation of electronic components, vacuum-tight seals or closures of display tubes or for display devices. They are also useful for coating and bonding of special glasses. The filling material can be made by reaction sintering of a powder mixture at temperatures of 800&deg; C. to 1250&deg; C.

Composite solder glass, filling material for same and methods of using same

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Wiesbaden, Germany

Hans-Werner Beudt