Abstract
A shrinkage mechamism of anode materials for molten carbonate fuel cells was discussed. Theoretical calculations were made by dividing the shrinkage process into the initial stage of plastic flow and the steady stage of steady-state creep of metals. The results showed that -ln(P0/P) ?? L and e ?? L in the initial stage and e ?? logt in the steady stage; where P0: initial porosity, P:porosity, L:surface pressure load, e:nominal strain and t:time. A model was examined in a H2-CO2-H2O (79-19-2 vol%) mixture gas stream under 2.5-8.9kgf/cm2 at 650°C for 50-1, 000 hours. The anode was porous sintered pure copper (porosity;43±1%) made of spherical gas-atomized powder which was sieved to 74-105μm. The experimental results indicated the proportionality relations mentioned above.
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