Forschungszentrum Karlsruhe Gmbh

Other

Karlsruher Institut Fur Technologie

Comet Ag

Joachim Binder

Hans-Joachim Ritzhaupt-Kleissl

Jürgen Hausselt

Volker Hennige

Rolf Jakoby

Thomas Fink

Stefan Stolz

Jochen Alkemper

Harald Rentsch

J&uuml;rgen Hausselt

Holger Maune

Patrick Scheele

Melanie Schroeder

Nadja Schlechtriemen

Kirsten Honnef

Juergen Hausselt

Shikha Ray

Andreas Pfrengle

Kevin Häuser

Florian Paul

Daniel Kienemund

Lea De Biasi

Nicole Bohn

Sven Glatthaar

Andre Giere

Georg Lieser

Christoph DRÄGER

Holger Gesswein

A radio-frequency (RF) power variable capacitor capable of operating at, at least, 50 watts in the MHz range. The capacitor has a composite HDK-NDK ceramic dielectric. The HDK (high dielectric constant) component comprises an active matrix of barium strontium titanate, for example. Acoustic resonances are reduced or eliminated by the addition of a metal or metalloid oxide such as magnesium borate (NDK—low dielectric constant), which acts as an acoustic resonance reduction agent (ARRA) in the RF power domain. The acoustic resonances which previously occurred under bias voltage 500 V or 1100 V in prior art RF power variable capacitors are eliminated by the addition of the ARRA.

Variable capacitor for RF power applications

A doped spinel comprising the formula:LiMe1Me2MnTiyOFwhere, 0&#x2266;w&#x3c;1, 0.3&#x3c;x&#x2266;0.7, 0.3&#x2266;v&#x3c;0.7, x&#x3e;v, 0.0001&#x2266;y&#x2266;0.35, and 0.0001&#x2266;z&#x2266;0.3. Me1 is a metal selected from a group of elements consisting of Cr, Fe, Co, Ni, Cu, and Zn. Me2 is a metal selected from a group of elements consisting of Ni, Fe, Co, Mg, Cr, V, Ru, Mg, Al, Zn, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and B.

Doped spinel, method for the production thereof, the use thereof and lithium-ion battery

A method for producing ceramic components, includes providing a dispersing agent comprising at least one first and one second powder fraction of an oxide ceramic, and a third powder fraction of an inter-metallic compound mixed in a liquid. The first powder fraction comprises a nanoscale particle fraction with particle sizes ranging from about 2 nm to 200 nm and functions as a binder. The second powder fraction comprises a sintering additive. The share of the third powder fraction, relative to the sum of all powder fractions, has a volume share of between about 50% and about 95%. The method further includes forming a green body with aid of precipitation by electrophoresis from the mixture, the precipitation by electrophoresis of the powder fractions occurring simultaneously. The green body is then sintered in an oxidizing atmosphere to form a ceramic component.

Method for producing ceramic components

The present invention relates to dielectric ceramics, thin and/or thick layers produced therefrom and a method for the production thereof and the use of the dielectrics and of the thin and/or thick layers.

Ceramic dielectric or thin and/or thick layers containing at least one ceramic dielectric method for production and use thereof

In dental ceramics containing zirconium dioxide and silicon-dioxide with a Zr/Si ratio of between 0.5 and 1.0, 1 to 12 wt % of aluminum oxide and up to 2 wt % of an alkali- or earth alkali metal oxide, those materials are selectively mixed with yttrium-stabilized zirconium dioxide with a Zr/Si ratio of the mixture being between 0.5 and 1 wt % and also a silicon organic compound as well as a compression aid, and a green body is formed from the mixture by milling, which green body is then sintered.

Dental ceramics and method for the manufacture thereof

The invention proposes to produce a mixture that is shrink-resistant, or has a freely selectable degree of shrinkage, and can be used as a molding compound, and a method for producing a corresponding oxide-ceramic sintered body. The molding compound comprises an intermetallic compound and a wax. In the method for producing an oxide-ceramic sintered body, a green body is molded from a molding compound of this type, dewaxed and sintered in an oxidizing atmosphere to form a ceramic sintered body. The molding compound is suited for producing dentures and dental fillings.

Molding compound, use thereof and a method for producing an oxide-ceramic sintered body

Dental composites containing hybrid fillers and process for their production. Dental compounds are disclosed which contain two- or multi-phase inorganic fillers in an organic polymer matrix. These are characterized by improved abrasion resistance.

Dental composites containing hybrid fillers and process for their production

Growing community of inventors

Karlsruhe, Germany

Joachim Binder