Glass ceramic mass and use thereof

US7030050B2 · kind B2 · utility

Assignees

• BUNDESANSTALT FÜR MATERIALFORSCHUNG UND-PRÜFUNG (BAM) · DE
• W.C. Heraeus GmbH & Co. KG · DE

Inventors

• Oliver Dernovsek · Lieboch, AT
• Markus Eberstein · Berlin, DE
• Ulrich Fritz · Berlin, DE
• Marion Gemeinert · Berlin, DE
• Christina Modes · Frankfurt, DE
• Gabriele Preu · Birkenfeld, DE
• Wolfgang Schiller · Berlin, DE
• Wolfram Wersing · Tauberbischofsheim, DE

Key dates

• Filing date: Aug 31, 2001
• Grant date: Apr 18, 2006
• Expiry date: Aug 31, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C8/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a glass ceramic mass containing at least one oxide ceramic containing barium, titanium and at least one rare earth metal Rek; and at least one glass material containing at least one oxide with boron, at least one oxide with silicon and at least one oxide with at least one bivalent metal Me2+. The glass ceramic mass is characterised in that the glass material contains at least one oxide with bismuth, especially bismuth trioxide. The oxide ceramic is especially a microwave ceramic of formula BaRek2Ti4O12, Rek being neodymium or samarium. The composition of the oxide ceramic remains essentially constant during the sintering of the glass ceramic, enabling the material properties of the glass ceramic mass, such as permittivity (20–80), quality (800–5000) and Tkf (±20 ppm/K) to be specifically predetermined. The glass ceramic mass is characterised by a densification temperature of under 910° C. and can is therefore suitable for use in LTCC (low temperature cofired ceramics) technology, for integrating a passive electrical component in the volume of a multilayered ceramic body. Silver in particular can be used as an electroconductive material in this case.