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Vol.36, No.2, 200 ~ 207, 1998
Title
A Study on Effect of Ni3Al Intermetallic Compound to Creep Behaviors of Ni-Al Anodes for Molten Carbonate Fuel Cells
김경국 , 이덕열 Kyung Kook Kim , Dok Yol Lee
Abstract
In this study, a Ni-12wt.%Al anode for molten carbonate fuel cells was fabricated by tape casting and subsequent sintering. Its creep behavior was compared with that of a Ni-5wt.%Al anode also fabricated in this study and its performance as an anode was checked through a unit cell test. Whereas the Ni-5wt.%Al anode was observed to exist as a single-phase solid solution, the Ni-12wt.%Al anode was in a state of a two-phase mixture of Ni-5wt.%Al solid solution and Ni ₃Al intermetallic compound. The two anodes had different porosities and therefore their creep behaviors were compared to each other with the porosity dependence of a porous structure`s creep behavior taken into account. The porosity dependence was determined from the analysis of creep test results for Ni anodes of various porosities. Thus, the higher creep resistance could be expected for the Ni-12wt.%Al anode than for the Ni-5wt.%Al anode. Also, the performance of a unit cell assembled with the Ni-12wt.%Al anode was reasonably good with a open circuit voltage of 1.13V and a closed circuit voltage of 0.78V at 150㎃/㎠ current density.
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