U. Vondercrone et al., SYNTHESIS AND THERMAL-PROPERTIES OF NI-ALLOY AL2O3 CERMETS FOR INTERCONNECTOR MATERIALS IN SOLID OXIDE FUEL-CELLS/, High-temperature materials and processes, 17(4), 1998, pp. 253-256
Ni-alloy/Al2O3 cermets are considered for interconnector materials of
solid oxide fuel cells. In this study the sintering behaviour of cerme
ts and their thermal expansion in dependence upon the Al2O3 content we
re investigated. Sintering in vacuum at 1340 degrees C gave samples wi
th a relative density up to 95.5%. Thermal expansion coefficients were
calculated from expansion curves of various cermet compositions. Cerm
ets with high metallic content showed only small deviations from coeff
icients calculated from the rule of mixtures, whereas cermets with hig
her Al2O3 contents showed significantly lowered thermal expansion coef
ficients ranging from 10 x 10(-6)/K down to 8.3 x 10(-6)/K for pure A1
(2)O(3).