The nickel based brazing alloys (BN-2, BNi-4) modified by reactive TiH2 have been studied for their gas sealing properties of anode-supported tubular SOFCs to ferritic stainless steel by induction brazing process. BNi-2 and BNi-4 are not wetted in YSZ electrolyte, but the brazing alloy with added TiH2 showed good wettability with YSZ electrolyte due to formation of a TiOX layer. Among the tested brazing alloys (BNi-2, BNi-4, modified BNi-2, modified BNi-4), all except modified BNi-4 did not join with YSZ. The gas tightness of a brazed cell was confirmed by OCV value, and it was stayed nearly the same as the theoretical value for 600h at 750 °C. Based on these experimental results, it is concluded that the BNi-4 modified by TiH2 is suitable as a sealing material in SOFCs operating at 750 °C.
- Advanced Energy Systems Division
High Temperature Sealing Method: Induction Brazing for SOFCs
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Heo, Y, Lee, S, Lim, T, Song, R, & Shin, D. "High Temperature Sealing Method: Induction Brazing for SOFCs." Proceedings of the ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. Newport Beach, California, USA. June 8–10, 2009. pp. 905-907. ASME. https://doi.org/10.1115/FuelCell2009-85208
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