Sealing arrangement for high-temperature fuel cell stack

US9112193B2 · kind B2 · utility

Assignee

• Forschungszentrum Jülich GmbH · DE

Inventors

• Hans-Rainer Zerfass · Burscheid, DE
• Dirk Federmann · Kevelaer, DE

Key dates

• Filing date: Feb 18, 2009
• Grant date: Aug 18, 2015
• Expiry date: Aug 31, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31678
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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 >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 Al2TiO5, and preferably between 20 and 30% by volume of Al2TiO5, 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) th…