Schott Ag

Schott Glas

Other

Karin Naumann

Franz Ott

Frank-Thomas Lentes

Otmar Becker

Uwe Kolberg

Werner Kiefer

Simone Monika Ritter

Christian Kunert

Norbert Greulich-Hickmann

Holger Hunnius

Ralf Diezel

Ottmar Becker

Christoph Berndhaeuser

Hans Duerolf

Friedrich Siebers

Wolfgang Schmidbauer

Ute Woelfel

Evelin Weiss

Christian Mueller

Christof Kass

Erich Rodek

Richard C Marlor

Volker Trinks

Ulrich Schiffner

Volker Ohmstede

Hildegard Römer

Michael Leister

Magdalena Winkler-Trudewig

Klaus Schoenberger

Guido Räke

Klaus Schönberger

Reinhard Männl

Jan Philipp Steigleder

Stefan Schmitt

Gerhard Nuessle

Michael Hahn

Herbert Stappen

Erhard Zemsch

Christoph Berndhäuser

Christian Müller

Monika Bürkner-Brigaldino

Richard Marlor

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

A method for melting inorganic materials, preferably glasses and glass-ceramics, in a melting unit with cooled walls is provided. The method includes selecting the temperature of at least one region of the melt is selected in such a way as to be in a range from T&#x2212;20% to T+20%, where the temperature Tis given by the temperature at which the energy consumption per unit weight of the material to be melted is at a minimum, with the throughput having been selected in such a way as to be suitably adapted to the required residence time.

Melting and refining in tanks with cooled walls

The invention relates to a device for homogenizing a glass melt in a melt receptacle, wherein at least one stirring device is disposed in a melt receptacle, which comprises a stirrer shaft and a plurality of stirrer blades, and wherein a gap () is formed between a wall region of the melt receptacle and the stirrer blades. According to the invention, the respective stirring device causes an axial feed action in an inner stirring region between the stirrer shaft and the stirrer blades in order to feed the melt in the stirring region along the stirrer shaft. A melt flow brought about by the axial feed action seals the gap against direct passage of the melt. According to the invention, a very high gap width can be achieved, thus preventing the abrasion of materials in the region of the marginal gap. This also reduces the complexity required for adjusting the device. According to the invention, a high level of homogenization can be achieved regardless of the entry point of the inhomogeneities.

Method and device for homogenizing glass melt

The device for homogenizing a glass melt has a melt receptacle and at least one stirring device arranged in the melt receptacle. Each stirring device consists of a stirrer shaft and stirrer blades extending toward an inside wall of the receptacle, which are configured to produce an axial feed of the glass melt in an inner stirring region between the stirrer shaft and front ends of the stirrer blades. The melt receptacle and the stirring device are configured so that a melt flow caused by the axial feed, which is opposite to the axial feed, seals a gap formed between the inside wall and the front ends of the stirrer blades, so that the glass melt cannot flow directly through the gap to a lower axial end of the inner stirring region. The invention also encompasses a method of homogenizing a glass melt.

The process of producing a refined borosilicate glass includes preparing a glass batch with a composition in wt. % on the basis of oxide content of SiO65-82; AlO, 2-8; BO, 5-13; MgO+CaO+SrO +BaO+ZnO, 0-7; ZrO, 0-2; and LiO+NaO+KO, 3-10; adding 0.05 wt. % to 0.6 wt. % of sulfate(s) expressed as SOto the glass batch as the refining agent; melting the glass batch including the refining agent to form melted glass; and then hot-shaping the borosilicate glass. The refining agent may also include from 0.01 wt. % to 0.6 wt. % of For from 0.015 wt. % to 0.6 wt. of Cl. The sulfate is preferably an alkali metal and/or alkaline earth metal sulfate or sulfates.

Method for producing borosilicate glasses

The borosilicate glass of the invention is highly resistant to solarization, because it is free of CeO. Also it contains 0.01 to 0.05 wt. % of FeOand 0.05 to 0.8 wt. % of TiO. This borosilicate glass is especially advantageous for production of flash tubes, gas discharge lamps, and fluorescent tubes for brake lights and display backlights.

Solarization stable borosilicate glass and uses thereof

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 invention describes a lead-free and arsenic-free special short flint glass with a refractive index 1.60&#x2266;n&#x2266;1.65, an Abbe number of 41&#x2266;&#x3bd;&#x2266;52, a relative partial dispersion 0.551&#x2266;P&#x2266;0.570 in the blue spectral region, a relative partial dispersion 0.507&#x2266;P&#x2266;0.525 in the red spectral region, a negative deviation of the relative partial dispersion from the normal line &#x394;P&#x2266;&#x2212;0.0045 and an improved chemical resistance which has the following composition (in % by weight): 

Lead-free and arsenic-free special short flint glass

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

An alkaline-earth aluminosilicate glass having a composition (in % by weight, based on oxide) of SiO&#x3e;55-64; AlO13-18; BO0-5.5; MO 0-7; CaO 5.5-14; SrO 0-8; BaO 6-17; ZrO0-2; CeO0-0.3; TiO0-0.5; CoO 0.01-0.035; FeO0.005-0.05; and NiO 0-0.03 is suitable for use in lamp bulbs

Alkaline-earth aluminosilicate glass, containing CA and BA, suitable for use in lamp bulbs, and a lamp bulb containing same

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

The silicate glass has a composition (in % by weight, based on oxide) of SiO , 54-72; Al O , 0.5-7; ZrO , 10-20; B O , 0-<5; Na O, 3-<8; K O, 0-5; with Na O&plus;K O, 2-<8; CaO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0&prop;10; with CaO&plus;MgO&plus;SrO&plus;BaO, >5-24; La O , 0-5; and TiO , 0-4. The glass also contains at least 0.6 percent by weight of La O or at least 0.1 percent by weight TiO . The glass has a hydrolytic resistance in hydrolytic glass 1, an acid resistance in acid class 3 or better, preferably acid class 1, a caustic lye resistance in lye class 1, a glass transition temperature (T ) of at least 650&deg; C., a thermal expansion coefficient (&agr; ) of 4.1&times;10 to 7.4&times;10 /K, a refractive index (n ) of 1.53 to 1.63, an Abb&eacute; number (&ngr; ) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;P ) of up to &minus;0.0130.

Glass with high proportion of zirconium-oxide and its uses

The silicate glass has a composition (in % by weight, based on oxide) of SiO , 54-72; Al O , 0.5-7; ZrO , >10-<18; B O , 0-<5; Na O, 2-<10; K O 0-5; with Na O&plus;K O, 2-<10; caO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0-12; with CaO&plus;MgO&plus;SrO&plus;BaO, >5-24; La O , 0-6; and TiO , 0-4. The glass has at least 0.6% by weight of La O or at least 0.1% by weight TiO . The glass is in hydrolytic glass 1, acid class 3 or better, preferably acid class 1, and lye class 1. It has a glass transition temperature (T ) of at least 640&deg; C., a thermal expansion coefficient (&agr; ) of 4.1&times;10 to 8.0&times;10 /K, a refractive index (n ) of 1.53 to 1.63, an Abb&eacute; number (&ngr; ) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;P ) of up to &minus;0.0130.

The lead-free bismuth-containing silicate glasses, which are particularly suitable for use as funnel glass or neck glass for cathode ray tubes and as soldering glass, have the following respective compositions (in % by weight, based on oxide): SiO 40-60; Bi O , 10-30; ZrO , 0-3; Al O , 0.5-5; MgO, 0-6; CaO, 0.5-5; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li O, 0-10; Na O, 1-10; K O, 2-10; Cs O, 0-3, sum of the alkali metal oxides, 5-20; CeO , 0-8; WO , 0.5-5; MoO , 0-5 and Sb O , 0-0.6; and SiO 30-50; Bi O , 20-40; ZrO , 0-3; Al O , 0.5-5; MgO, 0-4; CaO, 0.5-4; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li O, 0-5; Na O, 1-12; K O, 2-15; Cs O, 0-3, sum of the alkali metal oxides, 5-20; CeO , 0-8; WO , 0.5-5; MoO , 0-5 and Sb O , 0-0.6.

Lead-free bismuth-containing silicate glasses and uses thereof

A long life, halogen cycle, incandescent lamp ( ) for operation in excess of 85 volts. The lamp comprises a transparent glass envelope ( ) having sealed therewithin a tungsten filament ( ); a pair of electrical lead-ins ( ) connecting the filament and extending exteriorly of the envelope for connection to a supply voltage greater than 100 V; and a fill gas within the envelope, including a halogen, at a pressure of at least three atmospheres. The envelope is constructed of a five component alkaline earth aluminosilicate glass having a composition consisting essentially of, in weight percent from >58 to about 64% SiO , from about 14 to about 17% Al O ; from 0 to about 1% B O , from 1 to about 6% MgO, from about 6 to about 12% CaO, from about 7 to about 17% BaO and from 0 to about 1.5% ZrO .

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Ober-Olm, Germany

Karin Naumann