Abstract
Furnace brazing to attach metallic plates to LaCrO3 end plates in solid oxide fuel cell (SOFC) was investigated. The metallic plates act as a current collector to which a few conducting wires made of conventional heat-resisting alloys can be attached. The alloy CrFe5Y2O31 was found to be a suitable material for the current collector because its thermal expansion coefficient matches that of LaCrO3 better than heat-resisting nickel- or iron-based alloys. Among various filler alloys tested, SCP6 (Cu with 18 wt% Pd) enables the best wetting of LaCrO3 and CrFe5Y2O31 plates, leading to good adhesion between them. Several approaches were successfully pursued to reduce the bending of brazed LaCrO3/SCP6/CrFe5Y2O31 joints. The area specific resistance of some LaCrO3/SCP6/CrFe5Y2O31 joints increased slightly during annealing (1000°C in air for 2400 h) due to oxidation in the filler alloy. Nevertheless, it remained below the target limit of 0.2 Ω · cm2.
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