Brazing of metallic conductors onto ceramic plates in solid oxide fuel cells Part II Attaching conducting wires

Abstract

Commercialization of the solid oxide fuel cell (SOFC) will be facilitated by use of conventional materials and fabrication processes. In this paper, we discuss the results of brazing metallic wires, made of conventional heat-resisting alloys, onto metallic CrFe5Y2O31 conductor plates in SOFC. Such wires would be used for the current transport between individual SOFC stacks and to the power-consuming device. Aluminum-alloyed ferritic stainless steels (iron, 20 to 25 wt% chromium, 4.5 to 6 wt% aluminum) and Inconel 617 were found to be suitable materials for the wires. They can be brazed onto CrFe5Y2O31 using L-Ni 5 as filler for Inconel 617 and the ferritic steels, and Cr50Ni or L-Ni 5 for the ferritic steels. The effectiveness of the brazed conductor/CrFe5Y2O31 joints was verified by monitoring their resistance at 1000°C in air for 1000 h.