Schott Ag

Bastian Schoen

Peter Brix

Dieter Goedeke

Olaf Claussen

Joern Besinger

Jens Suffner

Joerg Schuhmacher

Hans-Joachim Schmitt

Jochen Herrmann

Ewald Mittermeier

Yvonne Pfluegler

Provided are a dispersion of a nanoparticulate mixed oxide of SiOwith at least one further metal oxide in a matrix monomer, methods for preparing such a dispersion, a dental composite producible by curing such a dispersion, and uses of the dispersion as a precursor for dental composites.

Dispersions of nanoscale dental glass particles and methods for preparing the same

The amorphous and/or partially crystalline glass solders are particularly suitable for high-temperature applications, e.g. in fuel cells or sensors in the exhaust gas stream of internal combustion engines. The glass solder is characterized by a linear coefficient of thermal expansion in the temperature range from 20&#xb0; C. to 300&#xb0; C. of 8.0&#xd7;10Kto 11.0&#xd7;10Kand a hemisphere temperature of 820&#xb0; C. to 1100&#xb0; C. and is suitable for laser bonding.

High-temperature glass solder and its uses

A crystallizing glass solder for high-temperature applications, which is free of PbO and contains, in % by weight on an oxide basis: 45% to 60% of BaO; 25% to 40% of SiO; 5% to 15% of BO; 0 to &#x3c;2% of AlO; 2 to 7.0, preferably 4.4 to 7.0%, of MgO; and at least one alkaline earth metal oxide from the group consisting of MgO, CaO and SrO, wherein CaO is 0% to 5% and the sum of the alkaline earth metal oxides MgO, CaO and SrO is 2% to 15%. Preferred embodiments of the glass solder contain from 3 to 15 wt. % of YOand have low porosity and high stability with respect to a moist fuel gas environment.

Crystallizing glass solders and uses thereof

A crystallizing glass solder for high-temperature applications, containing, in % by weight on an oxide basis: 45% to 60% of BaO, 25% to 40% of SiO, 5% to 15% of BO, 0 to &#x3c;2% of AlO, and at least one alkaline earth metal oxide from the group consisting of MgO, CaO and SrO, wherein CaO is 0% to 5% and the sum of the alkaline earth metal oxides MgO, CaO and SrO is 0% to 20%, preferably 2% to 15%. The glass solder is preferably free from TeOand PbO. Preferred embodiments of the glass solder contain from 3 to 15 wt. % of YOand have low porosity and high stability with respect to a moist fuel gas environment.

Crystallizing glass solder and use thereof

A glass powder is provided that includes, as the main component, powder particulates of glass having a mean particulate size of less than or equal to 1.5 &#x3bc;m, and which is free of particles having a particle size of greater than 10 &#x3bc;m. A process for the production of such a glass power is also provided. The glass powder is particularly suitable as a filler of plastic dental compositions, in particular dental composites.

Growing community of inventors

Landshut, Germany

Bastian Schoen