✍ Scribed by B.C. Church; T.H. Sanders; R.F. Speyer; J.K. Cochran
No coin nor oath required. For personal study only.
Potential interconnect alloys of Fe-Cr and Fe-Ni-Cr were fabricated via extrusion of metal oxide pastes followed by heat treatment in hydrogen. Thermal expansion of the different alloys was measured and compared with that of yttria-stabilized zirconia (YSZ). Oxidation experiments were performed in air at 700 • C using cyclic heating and weighing, as well as thermogravimetric analysis. Additions of chromium to a Fe50Ni alloy were found to improve oxidation resistance although the performance of Fe-Ni-Cr compositions was inferior to Fe-Cr alloys of similar chromium content. The improvement in oxidation behavior with increasing chromium content of the Fe-Ni-Cr alloys was contrasted with the negative impact of the chromium addition on thermal expansion matching with YSZ. Binary Fe-Cr alloys such as Fe20Cr appear to be better suited for use as a SOFC interconnect compared with Fe42.5Ni15Cr and other similar Fe-Ni-Cr alloys.
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