Tungsten paste for co-sintering with pure alumina and method for producing same

A tungsten paste suitable for co-sintering with 98+% alumina substrate can be produced by adding selected compositions of glass to the paste. Circuit packages produced in accordance with the present invention exhibit superior thermal conductivity, low shrinkage variability, and smoother and more hom...

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Bibliographische Detailangaben
Hauptverfasser:	LIND, ROGER S, HODGE, JAMES D, FOSTER, BRIAN C, BARRINGER, ERIC A
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY LIME, MAGNESIA MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS METALLURGY PRINTED CIRCUITS REFRACTORIES SEMICONDUCTOR DEVICES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	A tungsten paste suitable for co-sintering with 98+% alumina substrate can be produced by adding selected compositions of glass to the paste. Circuit packages produced in accordance with the present invention exhibit superior thermal conductivity, low shrinkage variability, and smoother and more homogeneous surface finish. A preferred embodiment of the invention utilizes a substrate comprising narrow size range alumina powder, thus yielding lower sintering temperature and further improvements in shrinkage variability and surface finish.