Endress + Hauser Gmbh + Co. Kg

Endress+hauserse+co. Kg

Friedrich-schiller-universitat Jena

Peter Siegmund

Elke Maria Schmidt

Andreas Rossberg

Markus Rettenmayr

Nils Ponath

Simon Pauly

Uta Kuhn

Andreas Roßberg

Uta KÜHN

A pressure sensor comprising two parts connected with one another via an active braze joint manufactured by active hard soldering, or brazing, with an active hard solder, or braze, especially a pressure contactable, pressure-dependently elastically deformable, measuring membrane, especially a ceramic measuring membrane, and a platform, especially a ceramic platform, which are connected by an active braze joint connecting an outer edge of the measuring membrane (which covers a pressure chamber with an outer edge of an end of the platform facing the measuring membrane, whose measuring characteristics are improved in that the active braze joint has a coefficient of thermal expansion dependent on the dimensions of the active braze joint and on the materials of the parts and matched to a coefficient of thermal expansion of at least one of the parts, especially the measuring membrane.

Pressure sensor having a joint of active braze

An assembly comprising: two ceramic bodies, which are joined by means of a joint of an active hard solder, or braze, wherein the active hard solder, or braze, has a continuous core volume, which is spaced, in each case, from the ceramic bodies by at least 1 &#x3bc;m, and an average composition Cwith a liquidus temperature T(C), wherein the composition Chas a coefficient of thermal expansion &#x3b1;(C), wherein &#x3b1;(C)=m&#xb7;&#x3b1;(K), wherein m&#x2264;1.5, especially m&#x2264;1.3 and preferably m&#x2264;1.2, wherein &#x3b1;(K) is the average coefficient of thermal expansion of the ceramic material of the ceramic bodies, wherein the joint has boundary layers, which border on the ceramic body, wherein at least one of the boundary layers, which lies outside of the core volume, has an average composition Cwith a liquidus temperature T(C), which lies not less than 50 K, preferably not less than 100 K, and especially preferably not less than 200 K, under the liquidus temperature T(C) of the average composition Cof the core volume.

Assembly having at least two ceramic bodies joined with one another, especially a pressure measuring cell, and method for joining ceramic bodies by means of an active hard solder, or braze

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Jena, Germany

Peter Siegmund