Forschungszentrum Juelich Gmbh

Forschungszentrum Julich Gmbh

Dirk Federmann

Hans-Rainer Zerfass

Sonja-Michaela Gross-Barsnick

Martin Müller

Walter Zwaygardt

Holger Janssen

Wilfried Behr

Sebastian Holtwerth

A method for producing a glass solder green seal, wherein a paste comprising a glass solder powder is applied to the surface of a screen, which on the bottom side and in the screen mesh comprises regions having a coating impermeable to the paste, and the paste is pushed through the screen onto a substrate and subsequently dried, wherein printing is carried out onto an intermediate carrier serving as the substrate, from which the dried glass solder green seal can be completely detached.

Method for producing a solder glass green seal

Disclosed is a sealing assembly for metal components, wherein the sealing assembly has an electrical insulating effect, and wherein the sealing assembly comprises a ceramic layer and a base brazing material disposed thereon, to which germanium is added. The addition of germanium advantageously ranges from 0.1 to 5.0 mol %, and preferably between 0.5 and 2.5 mol %. A particular embodiment provides for the use of a brazing material which additionally comprises silicon in the range of &#x3e;0 to 2.5 mol %, and preferably between 0.1 and 0.9 mol %. Furthermore, a brazing material having a further addition of 10 to 40% by volume of AlTiO, and preferably between 20 and 30% by volume of AlTiO, has proven to be particularly suited for the sealing assembly. The use of the special brazing material composition inside the sealing assembly generally results in reproducibly tight and insulating joints having the following properties: a) escape of brazing material is prevented and running of brazing material is reduced, b) the porosity of the brazing material (primarily individual pores or narrow pore lines) is markedly reduced, c) the brazed joints have sufficient electrical resistance, and d) the brazed joints are generally sufficiently gas-tight (leakage rate during He leakage test &#x3c;10mbar*1*s).

Sealing arrangement for high-temperature fuel cell stack

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Kevelaer, Germany

Dirk Federmann