Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Wacker-chemie Gmbh

Other

Degussa Aktiengesellchaft

Klaus Deller

Helmfried Krause

Bertrand Despeyroux

Monika Oswald

Helmut Mangold

Rolf Clasen

Roland Burmeister

Axel Kleemann

Gerrit Schneider

Rainhard Klingel

Hans Moesinger

Peter K Kleinschmit

Edgar Koberstein

Dieter Kerner

Michael Baacke

Bernd Lehmann

Herbert Mueller

Wenzel Kuehn

Rudolf Spielmannleitner

Juergen Meyer

Ludwig Schmidhammer

Erik Peldszus

Josef Riedel

Georg Fehringer

Markus Hornfeck

Yi Deng

Karlheinz Drauz

Peter Panster

Jürgen Meyer

Mario Scholz

Stefan Wieland

Stipan Katusic

Horst Weigel

Jurgen Martens

Manfred Ettlinger

Günther Michael

Rainer Golchert

Rudolf Strasser

Werner Hartmann

Uwe Schachtely

Josef Riedl

Wolfgang Kollenberg

Peter Albers

Hans Lansink-Rotgerink

Reinhard Klingel

Willibald Dafinger

Thomas Hennig

Dieter Nikolay

Andrea Tietze

Klaus-P Bauer

Susanne Reinhart

Monilca Oswald

Karin Bartels

Jochen Simon

Beate Kleinwaechter

Peter Schuetz

Hatte Christine

Christine Wagner

Martin Forster

Rolf Prof Clasen

Plasma-sprayed layers of aluminium oxide on a substrate are produced by using a pyrogenically produced aluminium oxide, for example selected from the group consisting of borosilicate and steel, as starting powder.

Plasma-sprayed layers of aluminum oxide

Plasma-sprayed layers of aluminium oxide

Granules based on silicon dioxide and having the properties:  They are prepared by dispersing silicon dioxide in water, spray drying, optionally heating and/or silanizing. Whereas a pyrogenic silicon dioxide powder with a BET surface area of 30 to 90 m/g, a DBP index of 80 or less, a mean aggregate area of less than 25000 nmand a mean aggregate circumference of less than 1000 nm, wherein at least 70% of the aggregates have a circumference of less than 1300 nm or a high-purity pyrogenically prepared silicon dioxide having metal contents of less than 0.2 &#x3bc;g/g is prepared by reacting a silicon tetrachloride having a metal content of less than 30 ppb by means of flame hydrolysis is used.

Granules based on pyrogenically prepared silicon dioxide, method for their preparation and use thereof

Slip containing at least one aluminium oxide powder and at least one unstabilized zirconium dioxide powder, wherein

Slip containing zirconium dioxide and aluminum oxide and shaped body obtainable therefrom

Nanoscalar, pyrogenically produced yttrium-zirconium mixed oxide which has a BET surface area of between 1 and 600 m/g, a total chloride content of less than 0.05 wt. % and does not exhibit a conversion into the monoclinic phase during storage is produced by atomizing yttrium compounds and zirconium compounds and reacting them in a flame. The mixed oxide can be used as ceramic raw material.

Nanoscalar pyrogenically produced yttrium-zirconium mixed oxide

A layer which is obtained by thermal treatment from an aqueous dispersion applied to a substrate, the dispersion containing silicon/titanium mixed oxide powder prepared by flame hydrolysis. It is prepared by applying a dispersion which contains the silicon/titanium mixed oxide powder to a substrate and then sintering by using a thermal treatment. It can be used, for example, on materials with very low coefficients of expansion.

Layer obtained from an aqueous dispersion containing a silicon/titanium mixed oxide powder prepared by flame-hydrolysis

Pyrogenically prepared silicon dioxide with the following physicochemical properties:

Glass prepared from pyrogenically prepared silicon dioxide

Aqueous dispersion comprising silicon/titanium mixed oxide powder with a BET surface area of 5 to 500 m/g which has been prepared by flame hydrolysis and has a titanium dioxide content of 0.5 to 20 wt. %, based on the powder, water and at least one pH-regulating substance which can be removed completely from the reaction mixture on heating, the aqueous dispersion having a solids content of between 40 and 80 wt. %. A green body produced therefrom with a green density of between 40 and 85%. A shaped glass article of optical quality with a coefficient of thermal expansion of not more than 0.5&#xd7;10/K produced from the green body.

Dispersion comprising silicon/titanium mixed oxide powder, and green bodies and shaped glass articles produced therefrom

SiO &mdash;TiO glasses having a low coefficient of thermal expansion are produced by a molding being produced that consists of SiO powder, SiO &mdash;TiO powder or TiO powder and that contains by way of secondary component a titanium-containing component which is converted into amorphous TiO .

Process for producing SiO2-TiO2 glasses having a low coefficient of thermal expansion

Pyrogenically prepared silicon dioxide

A product obtained by treating surface-modified, pyrogenically produced titanium dioxide with at least one ammonium-functional silane, such as by spraying the pyrogenically produced titanium dioxide with the at least one silane, alone or in ethanol solution, and tempering, and useful in the field of cosmetics in sunblocks, in toner powders, in paints and varnishes, in silicone rubber, as abrasives and polishes, for example, in the field of CMP.

Surface-modified titanium dioxide

A silicon-aluminum mixed oxide produced by flame hydrolysis and having a composition of from 1 to 99.999 wt. % Al O , the remainder being SiO , which mixed oxide exhibits an amorphous structure in the X-ray diffraction pattern and consists of intergrown primary particles, and in these primary particles crystallites are present. These crystallites having sizes of between one and 200 namometers and the specific surface of the powder being between 5 and 300 m /g. These products are produced by a process wherein silicon halide and aluminum halide are vaporized in a particular ratio to one another and are homogeneously mixed with air, oxygen and hydrogen in a mixing unit by means of any carrier gas, this mixture undergoes combustion in a burner of known construction and, after the separation of the solids from the vapour phase, any traces of halide possibly adhering to the product are separated off in a further processing step by means of moist air at elevated temperature. The silicon-aluminum mixed oxide produced by flame hydrolysis are used in the form of dispersions for polishing, in particular in the electronics industry (CMP).

Silicon-aluminum mixed oxide

The stability of polymers against the action of heat and flames is improved in that a pyrogenically produced titanium dioxide containing iron oxide is added to the polymers.

Method for improving the stability of polymers

Compacts produced from a pyrogenically produced oxide, magnesium stearate, methyl cellulose and urea are mixed together in the presence of water, compacted, dried, comminuted to a powder, and the powder is pressed with an isostatic press to compacts and the compacts tempered. The resulting compacts have an outside diameter of 16 to 100 mm.

Compacts based on pyrogenically produced oxides

Granules based on silicon dioxide and having the properties:

Granules based on pyrogenically prepared silicon dioxide, methods for

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Klaus Deller