CERAMIC COMPOSITION OF MATTER AND ITS USE

• Main Authors: BUCKPESCH; RAINER, FOLEY; PAUL
• Format: Patent
• Language: English
• Published: 08.09.1992
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CABLES; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CEMENTS; CERAMICS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; CONDUCTORS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GLASS; INSULATORS; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIME, MAGNESIA; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; MINERAL OR SLAG WOOL; PRINTED CIRCUITS; REFRACTORIES; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; SEMICONDUCTOR DEVICES; SLAG; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TREATMENT OF NATURAL STONE

A ceramic composition of matter which is sinterable at low temperatures is composed of a) 40 to 90% by weight of a finely disperse, high-melting oxidic material and b) 10 to 60% by weight of a finely disperse glass having a softening point of 500 DEG to 850 DEG C., a coefficient of thermal expansion (=CTE) of 2 to 5x10-6 K-1 (measured in the interval from 0 DEG to 400 DEG C.) and a dielectric constant of less than 5 (measured at 106 Hz and 20 DEG C.). The finely disperse oxidic material is composed of a mixture of MgO, Al2O3 and SiO2 in an Al2O3/MgO weight ratio of 1.8-4 with an SiO2 weight fraction of 42-65% by weight or an equivalent quantity of corresponding oxide precursors which, on heating, decompose to give these oxides. The MgO or the MgO precursor has a mean grain size of 0.05 to 3 mu m and the SiO2 or the SiO2 precursor has a mean grain size of 2 to 20 mu m. The composition sinters at 900 DEG -1100 DEG C. and is suitable for producing substrates or metallized housings.