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Oxidation ceramic to metal braze seals for applications in high temperature electrochemical devices and method of making

United States Patent

June 6, 2006
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
Reactive Air Brazing: Method of Joining Ceramic and Metal Parts in Solid Oxide Fuel Cells
A method of joining metal and ceramic parts, wherein an alumina forming metal part and a ceramic part are provided. A braze material in placed between the alumina forming metal part and the ceramic part, and the combination is then heated in an oxidizing atmosphere, preferably in air at a temperature of between C. and C. The alumina forming metal parts are selected from the group consisting of high temperature stainless steels, such as Durafoil (alpha-4), Fecralloy, Alumina-coated 430 stainless steel and Crofer-22APU, and high temperature superalloys such as Haynes 214, Nicrofer 6025, and Ducraloy. The braze material is selected as a metal oxide-noble metal mixture, preferably Ag--CuO, Ag--V.sub.2O.sub.5, and Pt--Nb.sub.2O.sub.5, and more preferably between 30.65 to 100 mole % Ag in CuO.
Weil; K. Scott (Richland, WA), Hardy; John S. (Richland, WA), Kim; Jin Yong (Richland, WA)
Battelle Memorial Institute (Richland, WA)
10/ 334,346
December 30, 2002